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You searched for: Subject term hydrophilicity Remove constraint Subject term: hydrophilicity Subject term contact angle Remove constraint Subject term: contact angle
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1. A Description of the Wool Fiber Surface Based on Contact Angle Measurements

Author:
Thomas J. Horr
Source:
Textile research journal v.67 no.1 pp. 1-5
ISSN:
1746-7748
Subject:
air; chemical analysis; contact angle; equations; fabrics; hydrophilicity; liquids; models; moieties; textile fibers; wool
Abstract:
... Contact angle data from various sources in conjunction with the Israelachvili and Gee equation derived for chemically heterogeneous surfaces are used to describe the wool fiber surface/liquid/air interface. A diagram representing surface compositions consistent with this data is constructed based on the assumption that the wool fiber surface chemical moieties consist of methyl, methylene, and hydr ...
DOI:
10.1177/004051759706700102

2. Growth modulation of fibroblasts by chitosan-polyvinyl pyrrolidone hydrogel: Implications for wound management?

Author:
Makarand Risbud; Anandwardhan Hardikar; Ramesh Bhonde
Source:
Journal of biosciences 2000 v.25 no.1 pp. 25-30
ISSN:
0250-5991
Subject:
adults; chitosan; collagen; contact angle; epithelial cells; epithelium; extracellular matrix; fetus; fibroblasts; hydrogels; hydrophilicity; image analysis; octane; polystyrenes; pyrrolidones; tetrazolium; tissue culture; wound treatment
Abstract:
... Wounds in adults and fetuses differ in their healing ability with respect to scar formation. In adults, wounds lacking the epidermis exhibit excess collagen production and scar formation. Fibroblasts synthesize and deposit a collagen rich extracellular matrix. The early migration and proliferation of fibroblasts in the wound area is implicated in wound scarring. We have synthesized a hydrogel from ...
DOI:
10.1007/BF02985178

3. Hydrophilic Treatment of Polyester Surfaces Using TiO2 Photocatalytic Reactions

Author:
Kazuya Sawada; Masakatsu Sugimoto; Mitsuo Ueda; Chan Hun Park
Source:
Textile research journal 2003 v.73 no.9 pp. 819-822
ISSN:
0040-5175
Subject:
X-ray photoelectron spectroscopy; contact angle; fabrics; hydrophilicity; irradiation; photocatalysis; photocatalysts; polyesters; textile fibers; titanium dioxide; ultraviolet radiation; wavelengths
Abstract:
... Photocatalytic hydrophilic treatment of polyester surfaces is investigated using TiO₂ as a photocatalyst. The hydrophilicity of photocatalyzed polyester film and fabric is evaluated by means of water absorbency, contact angles, and XPS analyses. Irradiation of uv light with an approximate wavelength of 352 nm produces effective photocatalytic action of TiO₂ on polyester. The surface properties of ...
DOI:
10.1177/004051750307300912

4. Visible-light induced hydrophilicity on nitrogen-substituted titanium dioxide films

Author:
Hiroshi Irie; Seitaro Washizuka; Norio Yoshino; Kazuhito Hashimoto
Source:
Chemical communications 2003 v. no.11 pp. 1298-1299
ISSN:
1364-548X
Subject:
chemical reactions; contact angle; hydrophilicity; irradiation; light; nitrogen; oxygen; titanium dioxide
Abstract:
... Nitrogen-substituted titanium dioxide thin films were found to undergo hydrophilic conversion under irradiation with visible light. The hydrophilicity was enhanced by increasing the degree of nitrogen substitution at oxygen sites. The water contact angle for the thin film with the greatest hydrophilicity, TiO₁.₉₈₈₄N₀.₀₁₁₆, changed from 20° to 6° following irradiation. ...
DOI:
10.1039/b302975a

5. Composition of Organic Matter Fractions for Explaining Wettability of Three Forest Soils

Author:
R. H. Ellerbrock; H. H. Gerke; J. Bachmann; M.-O. Goebel
Source:
Soil Science Society of America journal 2005 v.69 no.1 pp. 57-66
ISSN:
0361-5995
Subject:
Cambisols; Fourier transform infrared spectroscopy; Podzols; arsenic; capillarity; cations; clay; contact angle; forest soils; hydrophilicity; hydrophobicity; loamy sand soils; sodium pyrophosphate; soil organic carbon; soil sampling; wettability
Abstract:
... Soil organic matter (SOM) as a solid or as a film at mineral surfaces affects wetting properties in unsaturated soil. Soil organic matter mostly consists of a heterogeneous mixture of components with hydrophilic and hydrophobic functional groups. This paper analyzes relations of SOM to soil wettability by considering functional group compositions of different soluble fractions. Forest soil samples ...
DOI:
10.2136/sssaj2005.0057

6. Porous materials show superhydrophobic to superhydrophilic switching

Author:
Neil J. Shirtcliffe; Glen McHale; Michael I. Newton; Carole C. Perry; Paul Roach
Source:
Chemical communications 2005 v. no.25 pp. 3135-3137
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; contact angle; hydrophilicity; hydrophobicity; porous media
Abstract:
... Switching between superhydrophobicity and superhydrophilicity in porous materials was predicted theoretically and demonstrated experimentally with the example of thermally induced contact angle change; tunability of this system was also demonstrated. ...
DOI:
10.1039/b502896e

7. Effect of Selected Additives on Surface Energy of Fibers and Meltblown Nonwovens

Author:
Dong Zhang; Christine Sun; Jihua Xiao
Source:
Textile research journal 2006 v.76 no.3 pp. 261-265
ISSN:
0040-5175
Subject:
additives; contact angle; energy; hydrophilicity; nonwoven fabrics; polyesters; polypropylenes; textile fibers
Abstract:
... In this article a small amount (4%) of a series of polymer additives were blended with polypropylene (Exxon 3746G) and polyester (Eastman 14965) polymers and the mixtures were processed. The effect of these additives on the surface energy of the polymers was characterized by the contact angle measured on single fibers and by surface energy on nonwoven webs. The results indicate that fibers modifie ...
DOI:
10.1177/0040517506053905

8. Superhydrophobic surface directly created by electrospinning based on hydrophilic material

Author:
Meifang Zhu; Weiwei Zuo; Hao Yu; Wen Yang; Yanmo Chen
Source:
Journal of materials science 2006 v.41 no.12 pp. 3793-3797
ISSN:
0022-2461
Subject:
contact angle; hydrophilicity; hydrophobicity; nanomaterials; polymers
Abstract:
... We describe a method to form hydrophobic surfaces using PHBV (Poly (hydroxybutyrate-co-hydroxyvalerate))—a kind of intrinsically hydrophilic material. The concentration of polymer solutions was varied to control the surface morphology and resultant wetting property. The as-prepared films were characterized by micro-scale valley-and-hill structure, which was formed by aggregating of electrospun bea ...
DOI:
10.1007/s10853-005-5910-z

9. A general route to transform normal hydrophilic cloths into superhydrophobic surfaces

Author:
Tie Wang; Xiaoge Hu; Shaojun Dong
Source:
Chemical communications 2007 v. no.18 pp. 1849-1851
ISSN:
1364-548X
Subject:
chemical reactions; contact angle; gold; hydrophilicity; hydrophobicity; nanogold
Abstract:
... Herein, we describe a simple and inexpensive method for forming superhydrophobic cloths with the highest water contact angle of close to 180°, in which normal commercial cloths serving as pristine materials are modified with suitable gold micro/nanostructures. ...
DOI:
10.1039/b616778k

10. Channel wall coating on a poly-(methyl methacrylate) CE microchip by thermal immobilization of a cellulose derivative for size-based protein separation

Author:
Okada, Hiroki; Kaji, Noritada; Tokeshi, Manabu; Baba, Yoshinobu
Source:
Electrophoresis 2007 v.28 no.24 pp. 4582-4589
ISSN:
0173-0835
Subject:
adsorption; cellulose; coatings; contact angle; electrophoresis; evaporation; hydrophilicity; hydrophobic bonding; proteins
Abstract:
... We demonstrate channel wall coating using a cellulose derivative on a poly-(methyl methacrylate) (PMMA) CE microchip to eliminate EOF disturbing protein separation. The channel walls were modified by preconditioning with a solution containing the cellulose derivative and then thermally evaporating the solution to produce hydrophilic channel walls which prevent adsorption of analytes via a hydropho ...
DOI:
10.1002/elps.200700105

11. Dynamic modification of poly(methyl methacrylate) chips using poly(vinyl alcohol) for glycosaminoglycan disaccharide isomer separation

Author:
Zhang, Yong; Ping, Guichen; Kaji, Noritada; Tokeshi, Manabu; Baba, Yoshinobu
Source:
Electrophoresis 2007 v.28 no.18 pp. 3308-3314
ISSN:
0173-0835
Subject:
adsorption; coatings; contact angle; disaccharides; electrophoresis; fluorescence microscopy; hyaluronic acid; hydrophilicity; isomers; polyvinyl alcohol; scanning electron microscopy; sulfates; wettability
Abstract:
... We describe a microchip electrophoresis (MCE) method for the assay of unsaturated disaccharides of chondroitin sulfates, dermatan sulfates, and hyaluronic acid (HA). Poly(vinyl alcohol) (PVA) could be irreversibly adsorbed onto poly(methyl methacrylate) (PMMA) substrates and this approach was applicable for dynamic coating. The characteristics of the PMMA surface with PVA coating were evaluated in ...
DOI:
10.1002/elps.200700088

12. In-channel atom-transfer radical polymerization of thermoset polyester microfluidic devices for bioanalytical applications

Author:
Pan, Tao; Fiorini, Gina S.; Chiu, Daniel T.; Woolley, Adam T.
Source:
Electrophoresis 2007 v.28 no.16 pp. 2904-2911
ISSN:
0173-0835
Subject:
X-ray photoelectron spectroscopy; adsorption; amino acids; capillary electrophoresis; contact angle; derivatization; ethylene glycol; hydrophilicity; phosphorylation; polyesters; polymerization
Abstract:
... A new technique for polymer microchannel surface modification, called in-channel atom-transfer radical polymerization, has been developed and applied in the surface derivatization of thermoset polyester (TPE) microdevices with poly(ethylene glycol) (PEG). X-ray photoelectron spectroscopy, electroosmotic flow (EOF), and contact angle measurements indicate that PEG has been grafted on the TPE surfac ...
DOI:
10.1002/elps.200600817
PubMed:
17640094
PubMed Central:
PMC3269121

13. Preparation and characterization of titanium dioxide nanocomposite fibers

Author:
Qufu Wei; Liangyan Yu; Robert R. Mather; Xueqian Wang
Source:
Journal of materials science 2007 v.42 no.19 pp. 8001-8005
ISSN:
0022-2461
Subject:
coatings; contact angle; energy-dispersive X-ray analysis; hydrophilicity; nanocomposites; nanoparticles; polypropylenes; scanning electron microscopy; scanning probe microscopy; titanium dioxide; ultraviolet radiation
Abstract:
... Titanium dioxide and polypropylene fibers were prepared by melt-compounding and sputter coating, respectively. Energy dispersive x-ray analysis (EDX) confirmed the presence of titanium dioxide in the fibers. Through the application of environmental scanning electron microscopy (ESEM) and scanning probe microscopy (SPM), it was found that incorporating the titanium dioxide by melt-compounding cause ...
DOI:
10.1007/s10853-007-1582-1

14. Tailored surface properties of monodispersed polymer particles with PCL hairy chains synthesized by hydroxyl-initiated ring-opening polymerization

Author:
Wang, Fang; Hu, Jianhua; Yang, Wuli; Wang, Changchun
Source:
Journal of polymer science 2007 v.45 no.20 pp. 4552-4563
ISSN:
0887-624X
Subject:
contact angle; differential scanning calorimetry; dispersibility; emulsions; hydrophilicity; hydrophobicity; oils; polymerization; polymers; scanning electron microscopy; styrene; thermogravimetry
Abstract:
... Polymeric particles with hydrophobic PCL hairy chains were prepared by ring-opening polymerization (ROP) from hydrophilic core particles, which were prepared by soap-free emulsion polymerization of styrene, 2-hydroxyethyl methacrylate, and divinylbenzene. Due to the incorporation of 2-hydroxyethyl methacrylate in the core particles, hydroxyl groups on the surface of core particles could be obtaine ...
DOI:
10.1002/pola.22161

15. Enzymatic hydrolysis of PTT polymers and oligomers

Author:
Eberl, A.; Heumann, S.; Kotek, R.; Kaufmann, F.; Mitsche, S.; Cavaco-Paulo, A.; Gübitz, G.M.
Source:
Journal of biotechnology 2008 v.135 no.1 pp. 45-51
ISSN:
0168-1656
Subject:
Fusarium solani; Penicillium citrinum; Thermobifida fusca; Thermomyces lanuginosus; biotechnology; contact angle; crystal structure; cutinase; enzymatic hydrolysis; fabrics; hydrolysis; hydrophilicity; mercuric chloride; polyesters
Abstract:
... Oligomers and polymers (film, fabrics) of the linear aromatic polyester poly(trimethylene terephthalate) (PTT) were treated with polyesterases from Thermomyces lanuginosus, Penicillium citrinum, Thermobifida fusca and Fusarium solani pisi. The cutinase from T. fusca was found to release the highest amounts of hydrolysis products from PTT materials and was able to open and hydrolyse a cyclic PTT di ...
DOI:
10.1016/j.jbiotec.2008.02.015

16. Characterization of an organic-solvent-tolerant Brevibacillus agri strain 13 able to stabilize solvent/water emulsion

Author:
Kongpol, Ajiraporn; Pongtharangkul, Thunyarat; Kato, Junichi; Honda, Kohsuke; Ohtake, Hisao; Vangnai, Alisa S.
Source:
FEMS microbiology letters 2009 v.297 no.2 pp. 225-233
ISSN:
0378-1097
Subject:
Brevibacillus agri; bacteria; bacterial adhesion; biocatalysts; biotransformation; carbon; contact angle; droplets; emulsions; fluorescence microscopy; hydrophilicity; solvents; zeta potential
Abstract:
... Brevibacillus agri strain 13 was isolated and characterized as a Gram-positive organic-solvent-tolerant bacterium able to grow at 45 °C. It can tolerate high concentrations (5% and 20%, v/v) of various organic solvents with a broad range of log Pow when the organic solvent was provided as a nonaqueous layer. Although it can tolerate a number of aromatic solvents, it cannot utilize them as a sole c ...
DOI:
10.1111/j.1574-6968.2009.01684.x
PubMed:
19548892

17. Characterizing hydrophobicity of interfaces by using cavity formation, solute binding, and water correlations

Author:
Godawat, Rahul; Jamadagni, Sumanth N.; Garde, Shekhar
Source:
Proceedings of the National Academy of Sciences of the United States of America 2009 v.106 no.36 pp. 15119-15124
ISSN:
0027-8424
Subject:
contact angle; drying; energy; hydrophilicity; hydrophobicity; probability; proteins; solutes
Abstract:
... Hydrophobicity is often characterized macroscopically by the droplet contact angle. Molecular signatures of hydrophobicity have, however, remained elusive. Successful theories predict a drying transition leading to a vapor-like region near large hard-sphere solutes and interfaces. Adding attractions wets the interface with local density increasing with attractions. Here we present extensive molecu ...
DOI:
10.1073/pnas.0902778106
PubMed:
19706896
PubMed Central:
PMC2741215

18. Engineering Zein Films with Controlled Surface Morphology and Hydrophilicity

Author:
Shi, Ke; Kokini, Jozef L.; Huang, Qingrong
Source:
Journal of agricultural and food chemistry 2009 v.57 no.6 pp. 2186-2192
ISSN:
0021-8561
Subject:
films (materials); acetic acid; hydrophilic interactions; aqueous solutions; contact angle; ozonation; ozone; zein; irradiation; ultraviolet radiation; ethanol
Abstract:
... A new method to engineer zein films with controlled surface morphology and hydrophilicity has been developed. The resulting surface morphology and surface hydrophilicity have been studied by tapping mode atomic force microscopy (TP-AFM) and a combination of water contact angle measurements and X-ray photoelectron spectroscopy (XPS), respectively. Our AFM results revealed that zein films cast from ...
DOI:
10.1021/jf803559v
PubMed:
19231898

19. Fouling and Degradation of Polycarbonate in Seawater: Field and Lab Studies

Author:
Artham, Trishul; Doble, Mukesh
Source:
Journal of polymers and the environment 2009 v.17 no.3 pp. 170-180
ISSN:
1566-2543
Subject:
Pseudomonas; biodegradation; biofouling; bisphenol A; contact angle; glass transition temperature; hydrolysis; hydrophilicity; molecular weight; oxidation; ribosomal DNA; seawater; specific heat; weight loss; Bay of Bengal; India
Abstract:
... Biofouling and ensuing microbial mediated degradation of Bisphenol A polycarbonate was studied by immersing the samples in sea water of Bay of Bengal (Chennai, India) for 3 months and also under controlled laboratory conditions with marine mixed microbial consortia for 12 months. A 9% weight loss in the sample was observed after 1 year of incubation under in vitro laboratory conditions. A 5% reduc ...
DOI:
10.1007/s10924-009-0135-x

20. High-pressure-synthesis of poly(isopropenyl alcohol) and its biocompatibilities

Author:
Nishino, Takashi; Kitamura, Naho; Murotani, Kazuyoshi
Source:
Journal of polymer science 2009 v.47 no.3 pp. 754-761
ISSN:
0887-624X
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; acetates; adsorption; albumins; alcohols; cell adhesion; contact angle; energy; hydrophilicity; molecular weight; polymerization; polyvinyl alcohol; saponification; thermal analysis
Abstract:
... Free radical polymerization under ambient conditions gives very low-molecular weight homopolymer of isopropenyl acetate (IPAc). On the other hand, poly (isopropenyl acetate) (PIPAc) with a weight average molecular weight over 10⁴ was found to be synthesized by high-pressure (1 GPa) radical polymerization. Poly(isopropenyl alcohol) (PIPOH) was then derived from PIPAc by saponification. The structur ...
DOI:
10.1002/pola.23191

21. Rutile thin film responsive to visible light and with high UV light sensitivity

Author:
Hiroki Nagai; Sohei Aoyama; Hiroki Hara; Chihiro Mochizuki; Ichiro Takano; Norio Baba; Mitsunobu Sato
Source:
Journal of materials science 2009 v.44 no.3 pp. 861-868
ISSN:
0022-2461
Subject:
Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; aqueous solutions; contact angle; crystal structure; decolorization; glass; hydrophilicity; methylene blue; oxygen; photosensitivity; quartz; refractive index; sol-gel processing; titanium; transmission electron microscopes; ultraviolet radiation
Abstract:
... A transparent rutile thin film 100 nm thick was fabricated on a quartz glass substrate; it was responsive to visible light and had a higher sensitivity to UV light than an anatase thin film formed by sol–gel method under identical conditions. The crystal structure was determined by observations using X-ray diffraction, Raman spectra, and a transmission electron microscope. The oxygen/titanium rati ...
DOI:
10.1007/s10853-008-3185-x

22. Synthesis of amphiphilic cationic copolymers poly[2-(methacryloyloxy)ethyl trimethylammonium chloride-co-stearyl methacrylate] and their self-assembly behavior in water and water-ethanol mixtures

Author:
Sun, Guixiang; Zhang, Mingzu; He, Jinlin; Ni, Peihong
Source:
Journal of polymer science 2009 v.47 no.18 pp. 4670-4684
ISSN:
0887-624X
Subject:
Fourier transform infrared spectroscopy; aqueous solutions; composite polymers; contact angle; fluorescence; hydrophilicity; hydrophobicity; light scattering; matrix-assisted laser desorption-ionization mass spectrometry; molecular weight; nanoparticles; nuclear magnetic resonance spectroscopy; particle size; surface tension; transmission electron microscopy
Abstract:
... A series of amphiphilic cationic random copolymers, namely poly[2-(methacryloyloxy)ethyl trimethylammonium chloride-co-stearyl methacrylate] or poly(MADQUAT-co-SMA), have been synthesized via conventional free-radical copolymerization using 2,2'-azobisisobutyronitrile (AIBN) as initiator and n-dodecanethiol as chain transfer agent. The resultant products were then characterized by FT-IR, ¹H NMR, M ...
DOI:
10.1002/pola.23517

23. Synthesis of quaternary ammonium ion-grafted polyolefins via activation of inert C----H bonds and nitroxide mediated radical polymerization

Author:
Jo, Tae Soo; Yang, Meilong; Brownell, Lacie V.; Bae, Chulsung
Source:
Journal of polymer science 2009 v.47 no.18 pp. 4519-4531
ISSN:
0887-624X
Subject:
alkanes; ammonium compounds; boron; composite polymers; contact angle; crosslinking; hydrophilicity; polymerization; polyolefin
Abstract:
... A TEMPO-functionalized isotactic poly(1-butene) macroinitiator was synthesized via rhodium-catalyzed activation of the alkane C----H bonds in polyolefin side chain using a boron reagent and subsequent transformations of the boronate ester group in the polymer. These functionalization processes did not induce cross-linking or degradation of the polymer chains. Nitroxide mediated radical polymerizat ...
DOI:
10.1002/pola.23505

24. Antifouling poly(vinylidene fluoride) ultrafiltration membranes containing amphiphilic comb polymer additive

Author:
Koh, Jong Kwan; Kim, Yong Woo; Ahn, Sung Hoon; Min, Byoung Ryul; Kim, Jong Hak
Source:
Journal of polymer science 2010 v.48 no.2 pp. 183-189
ISSN:
0887-6266
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; chlorine; contact angle; crystal structure; hydrophilicity; mechanical properties; nuclear magnetic resonance spectroscopy; polymerization; polymers; ultrafiltration
Abstract:
... An amphiphilic comb polymer consisting of poly(vinylidene fluoride-co-chlorotrifluoroethylene) [P(VDF-co-CTFE)] main chains and poly(oxyethylene methacrylate) (POEM) side chains was synthesized using direct initiation of the chlorine atoms in CTFE units through atom transfer radical polymerization, as confirmed by ¹H NMR and FTIR spectroscopy. The P(VDF-co-CTFE)-g-POEM comb polymer was introduced ...
DOI:
10.1002/polb.21887

25. Assessment of alcohol percentage test for fungal surface hydrophobicity measurement

Author:
Chau, H.W.; Goh, Y.K.; Si, B.C.; Vujanovic, V.
Source:
Letters in applied microbiology 2010 v.50 no.3 pp. 295-300
ISSN:
0266-8254
Subject:
Alternaria; Cladosporium cladosporioides; Fusarium; Laccaria laccata; Mortierella; Penicillium aurantiogriseum; contact angle; ethanol; fungi; hydrophilicity; hydrophobicity; microbial growth; morphogenesis; mycelium; pathogenesis
Abstract:
... To determine whether assessing the penetration of solutions with different concentrations of ethanol (alcohol percentage test: APT) on fungal surfaces is effective in characterization of hydrophobicity on fungal surfaces. APT and contact angle (CA) measurements were conducted on nine hydrophobic and two hydrophilic fungal strains from the phyla of Ascomycota, Basidiomycota and Zygomycota. There wa ...
DOI:
10.1111/j.1472-765X.2009.02791.x
PubMed:
20070510

26. Characterization and Properties of Hydrophilic Cellulose Acetate Propionate Derivative

Author:
Carvalho, Elaine S.; Sánchez, Rubén J.; Tavares, Maria I. B.; Lamônica, Álano C.
Source:
Journal of polymers and the environment 2010 v.18 no.4 pp. 661-667
ISSN:
1566-2543
Subject:
Fourier transform infrared spectroscopy; acrylic acid; cellulose; cellulose acetate; contact angle; glass transition; hydrophilicity; nuclear magnetic resonance spectroscopy; polymers; propionic acid; thermal stability
Abstract:
... The chemical modification of Acrylamidomethyl Cellulose Acetate Propionate (AMCAP) was carried out by radical addition of acrylic acid. The structural modification was confirmed with the aid of FTIR, MS and NMR techniques. Thermal properties of hydrophilic cellulose derivative (AMCAP-H₂O₂) such as glass transition (Tg 153 °C) and thermal stability (372.7 °C) were determined by DSC and TGA techniqu ...
DOI:
10.1007/s10924-010-0221-0

27. Effect of Weave Geometry on Surface Energy Modification of Textile Materials via Atomic Layer Deposition

Author:
Kelly M. Roth; Kim G. Roberts; G. Kevin Hyde
Source:
Textile research journal 2010 v.80 no.18 pp. 1970-1981
ISSN:
0040-5175
Subject:
aluminum oxide; coatings; contact angle; energy; geometry; hydrophilicity; hydrophobicity; textile fibers; textile finishes; woven fabrics; yarns
Abstract:
... Atomic layer deposition (ALD) has recently been demonstrated as a novel method for the creation of nanoscale coatings on fiber-based materials. The ALD process has proven effective in altering the surface energy of both woven and nonwoven materials. In this work, the effect of fabric weave geometry on the behavior of ALDmodified fabrics has been studied. Aluminum oxide ALD was used to modify a ser ...
DOI:
10.1177/0040517510371868

28. From superhydrophobicity and water repellency to superhydrophilicity: smart polymer-functionalized surfaces

Author:
Emmanuel Stratakis; Anca Mateescu; Marios Barberoglou; Maria Vamvakaki; Costas Fotakis; Spiros H. Anastasiadis
Source:
Chemical communications 2010 v.46 no.23 pp. 4136-4138
ISSN:
1364-548X
Subject:
chemical reactions; contact angle; droplets; hydrophilicity; hydrophobicity; hysteresis; polymers
Abstract:
... pH-responsive surfaces, reversibly switching between superhydrophilicity and superhydrophobicity/water repellency, are developed by “grafting from” a pH-sensitive polymer onto a hierarchically micro/nano-structured substrate. We quantify the water repellency by investigating the restitution coefficient of water droplets bouncing off the surfaces. The water repellent state requires appropriate hydr ...
DOI:
10.1039/c003294h

29. Hydrogen bonding interactions, crystallization, and surface hydrophobicity in nanostructured epoxy/block copolymer blends

Author:
Hameed, Nishar; Guo, Qipeng; Hanley, Tracey; Mai, Yiu-Wing
Source:
Journal of polymer science 2010 v.48 no.7 pp. 790-800
ISSN:
0887-6266
Subject:
Fourier transform infrared spectroscopy; X-radiation; bisphenol A; composite polymers; contact angle; crystallization; differential scanning calorimetry; energy; epoxides; hydrogen bonding; hydrophilicity; hydrophobicity; melting point; mixing; nanomaterials; transmission electron microscopy
Abstract:
... Hydrogen bonding interactions, phase behavior, crystallization, and surface hydrophobicity in nanostructured blend of bisphenol A-type epoxy resin (ER), for example, diglycidyl ether of bisphenol A (DGEBA) and poly(ε-caprolactone)-block-poly(dimethyl siloxane)-block-poly(ε-caprolactone) (PCL-PDMS-PCL) triblock copolymer were investigated by Fourier transform infrared (FTIR) spectroscopy, different ...
DOI:
10.1002/polb.21950

30. Hydrophilic functionalization of syndiotactic polystyrene via a combination of electrophilic bromination and Suzuki-Miyaura reaction

Author:
Shin, Jihoon; Chang, Ying; Nguyen, Thi Le Thanh; Noh, Seok Kyun; Bae, Chulsung
Source:
Journal of polymer science 2010 v.48 no.19 pp. 4335-4343
ISSN:
0887-624X
Subject:
acids; bromination; bromine; contact angle; hydrophilicity; polystyrenes; styrene
Abstract:
... Postfunctionalization of high-molecular-weight syndiotactic polystyrene (sPS) was achieved via combination of electrophilic bromination at the para-position of the polymer aromatic ring and subsequent Suzuki-Miyaura cross-coupling reactions with functionalized phenylboronic acids. The concentration of brominated styrene repeating unit in sPS was conveniently controlled by changing the ratio of add ...
DOI:
10.1002/pola.24222

31. Molecular origins of fluorocarbon hydrophobicity

Author:
Dalvi, Vishwanath H.; Rossky, Peter J.
Source:
Proceedings of the National Academy of Sciences of the United States of America 2010 v.107 no.31 pp. 13603-13607
ISSN:
0027-8424
Subject:
ambient temperature; contact angle; hydrogen bonding; hydrophilicity; hydrophobicity; octane; perfluorocarbons; solutes; thiols; van der Waals forces
Abstract:
... We have undertaken atomistic molecular simulations to systematically determine the structural contributions to the hydrophobicity of fluorinated solutes and surfaces compared to the corresponding hydrocarbon, yielding a unified explanation for these phenomena. We have transformed a short chain alkane, n-octane, to n-perfluorooctane in stages. The free-energy changes and the entropic components cal ...
DOI:
10.1073/pnas.0915169107
PubMed:
20643968
PubMed Central:
PMC2922239

32. Passive regulation of volume-flow ratio for microfluidic streams with different hydrophilicity and viscosity

Author:
Kim, Sung-Jin; Lim, Yong Taik; Yang, Haesik; Kim, Kyuwon; Kim, Youn Tae
Source:
Electrophoresis 2010 v.31 no.4 pp. 709-713
ISSN:
0173-0835
Subject:
capillarity; contact angle; electrophoresis; flow resistance; hydrophilicity; pumps; streams; surface tension; viscosity
Abstract:
... Biochemical solutions have a wide range of hydrophilicity (contact angle and surface tension) and viscosity. A critical challenge is that microfluidic systems typically need expensive or complex pumps to control the various parallel biochemical streams. In this study, without using any pumps, we present a simple scheme that controls the ratio of the volumetric flow rate (VFR) of the parallel strea ...
DOI:
10.1002/elps.200900551

33. Self-emulsification and surface modification effect of fluorinated amphiphilic acrylate graft copolymers

Author:
Cha, Mi Sun; Kim, Jae Won; Ha, Jong-Wook; Park, In Jun; Lee, Soo-Bok; Yang, Tingting; Cheng, Shiyuan
Source:
Journal of polymer science 2010 v.48 no.20 pp. 4574-4582
ISSN:
0887-624X
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; composite polymers; contact angle; energy; hydrophilicity; hydrophobicity; light scattering; nuclear magnetic resonance spectroscopy; polymethylmethacrylate; surfactants
Abstract:
... We report on self-emulsification and surface modification effect of novel fluorinated amphiphilic graft copolymers prepared with perfluoroalkyl acrylate and 2-dimethylaminoethyl methacrylate using simple macromonomer technique and radical copolymerization. The interfacial properties of amphiphilic graft copolymers were characterized with light scattering, contact angle measurement, and X-ray photo ...
DOI:
10.1002/pola.24249

34. Structured multistimuli-responsive functional polymer surfaces obtained by interfacial diffusion of amphiphilic block copolymers

Author:
Bousquet, Antoine; Ibarboure, Emmanuel; Papon, Eric; Labrugère, Christine; Rodríguez-Hernández, Juan
Source:
Journal of polymer science 2010 v.48 no.9 pp. 1952-1961
ISSN:
0887-624X
Subject:
X-ray photoelectron spectroscopy; air; chemical composition; composite polymers; contact angle; hydrophilicity; hydrophobicity; molecular weight; pH; polystyrenes; solvents; temperature; toluene; water vapor
Abstract:
... Herein, we report the preparation of structured multistimuli-responsive surfaces able to change reversibly both their chemical composition depending on the environment and their surface behavior by varying either/both the pH or/and the temperature. For that purpose, we took advantage of the surface segregation in homopolymer/diblock copolymer blends, composed of either polystyrene-block-poly(N,N′- ...
DOI:
10.1002/pola.23962

35. Surface grafting on poly(ethylene terephthalate) track-etched microporous membrane by activation with trifluorotriazine: Application to the biofunctionalization with GRGDS peptide

Author:
Rerat, Vincent; Pourcelle, Vincent; Devouge, Sabrina; Nysten, Bernard; Marchand-Brynaert, Jacqueline
Source:
Journal of polymer science 2010 v.48 no.1 pp. 195-208
ISSN:
0887-624X
Subject:
X-ray photoelectron spectroscopy; acetonitrile; air; atomic force microscopy; autoclaves; biocompatible materials; cell culture; contact angle; derivatization; gamma radiation; heat; hydrophilicity; ionization; polyethylene terephthalates; steam
Abstract:
... A two-step wet chemistry protocol has been developed for the surface derivatization of poly(ethylene terephthalate) (PET) track-etched membrane used as cell culturing support, that is, (a) activation by trifluorotriazine (1 M in acetonitrile (ACN), 30 °C, 3 h); (b) coupling to amine-terminated molecules, namely 3,5-bis(trifluoromethyl)benzylamine ((F)Tag), (L)-4,5-[³H]-lysine, and Gly-Arg-Gly-Asp- ...
DOI:
10.1002/pola.23778

36. Surface modification of UV-cured epoxy resins by click chemistry

Author:
Durmaz, Yasemin Yuksel; Sangermano, Marco; Yagci, Yusuf
Source:
Journal of polymer science 2010 v.48 no.13 pp. 2862-2868
ISSN:
0887-624X
Subject:
alkynes; bromine; contact angle; epoxides; gels; glass; hydrophilicity; polyethylene glycol; polymerization; resins; sodium azide; spectroscopy; ultraviolet radiation
Abstract:
... A novel method for surface modification of UV-cured epoxy network was described. Photoinitiated cationic copolymerization of a bisepoxide, namely 3,4-epoxy cyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (EEC) with epibromohydrine (EBH) by using a cationic photoinitiator, [4-(2-methylpropyl)phenyl]4-methylphenyl-iodonium hexafluorophosphate, in propylene carbonate solution was studied. The real-t ...
DOI:
10.1002/pola.24063

37. Synthesis of polymeric 1-iminopyridinium ylides as photoreactive polymers

Author:
Klinger, Daniel; Nilles, Katja; Theato, Patrick
Source:
Journal of polymer science 2010 v.48 no.4 pp. 832-844
ISSN:
0887-624X
Subject:
alcohols; amines; contact angle; hydrophilicity; irradiation; polymerization; polymers
Abstract:
... Two synthetic routes to polymeric 1-imino pyridinium ylides as new photoreactive polymeric architectures were investigated. In the first approach, polymerization of newly synthesized 1-imino pyridinium ylide containing monomers yielding their polymeric analogues was achieved by free radical polymerization. Alternatively, reactive precursor polymers were synthesized and converted into the respectiv ...
DOI:
10.1002/pola.23832

38. A computational fluid dynamics model using the volume of fluid method for describing the dynamics of spreading of Newtonian fluids

Author:
Hocine Alla; Somia Freifer; Thibault Roques-Carmes
Source:
Colloids and surfaces 2011 v.386 no.1-3 pp. 107-115
ISSN:
0927-7757
Subject:
adhesion; colloids; contact angle; glass; hydrophilicity; models; surface tension; surfactants; viscosity
Abstract:
... A numerical study is performed to describe the dynamics of drop spreading of glycerol–water mixtures with and without surfactant on hydrophilic glass surfaces. A computational fluid dynamics model (CFD), based on the volume of fluid technique (VOF), with piecewise linear interface calculations method (PLIC) for interface reconstruction, is applied to simulate the time evolution of spreading drops ...
DOI:
10.1016/j.colsurfa.2011.07.006

39. A new functionalization strategy for oil/water separation membranes

Author:
Samuel J. Maguire-Boyle; Andrew R. Barron
Source:
Journal of membrane science 2011 v.382 no.1-2 pp. 107-115
ISSN:
0376-7388
Subject:
aluminum oxide; artificial membranes; carboxylic acids; coatings; contact angle; cysteic acid; emulsions; hydrocarbons; hydrophilicity; nanoparticles; oils; pH; silicon
Abstract:
... The fabrication of surface functionalized alumina fabric composite membranes using hydrophilic cysteic acid surface stabilized alumina nanoparticles (alumoxanes) have been investigated. Contact angle measurements for a range of carboxylic acids functionalized onto alumina coated silicon wafers was investigated to determine the functionalization that results in the most hydrophilic surface. Highly ...
DOI:
10.1016/j.memsci.2011.07.046

40. A novel approach to modify poly(vinylidene fluoride) via iron-mediated atom transfer radical polymerization using activators generated by electron transfer

Author:
Zhao, Tao; Zhang, Lifen; Zhang, Zhengbiao; Zhou, Nianchen; Cheng, ZhenPing; Zhu, XiuLin
Source:
Journal of polymer science 2011 v.49 no.11 pp. 2315-2324
ISSN:
0887-624X
Subject:
X-ray photoelectron spectroscopy; adsorption; air; ascorbic acid; bovine serum albumin; catalysts; composite polymers; contact angle; electron transfer; ferric chloride; fluorine; hydrophilicity; microfiltration; nuclear magnetic resonance spectroscopy; polyethylene glycol; polymerization; reducing agents; scanning electron microscopy
Abstract:
... Iron-mediated atom transfer radical polymerization using activators generated by electron transfer directly from the secondary fluorine atoms on the poly(vinylidene fluoride) (PVDF) backbone, using methyl methacrylate (MMA) and poly (ethylene glycol) methyl ether methacrylate (PEGMA) as the monomers, FeCl₃·6H₂O as the catalyst, PPh₃ as the ligand, and vitamin C as the reducing agent, was demonstra ...
DOI:
10.1002/pola.24651

41. A novel positively charged nanofiltration membrane prepared from N,N-dimethylaminoethyl methacrylate by quaternization cross-linking

Author:
Xiao-Lin Li; Li-Ping Zhu; You-Yi Xu; Zhuan Yi; Bao-Ku Zhu
Source:
Journal of membrane science 2011 v.374 no.1-2 pp. 33-42
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; artificial membranes; atomic force microscopy; contact angle; crosslinking; hydrophilicity; magnesium chloride; nanofiltration; pH; permeability; polymerization; scanning electron microscopy; sodium sulfate; ultrafiltration; ultraviolet radiation; zeta potential
Abstract:
... A novel method for the preparation of hydrophilic and positively charged nanofiltration (NF) membranes was developed. An active top-layer with NF characteristic was composited onto polysulfone (PSf) ultrafiltration substrate by UV-induced graft polymerization of N,N-dimethylaminoethyl methacrylate (DMAEMA) followed by quaternization cross-linking with p-xylylene dichloride (XDC). Fourier transform ...
DOI:
10.1016/j.memsci.2011.03.006

42. Amidolytic, procoagulant, and activation-suppressing proteins produced by contact activation of blood factor XII in buffer solution

Author:
Avantika Golas; Chyi-Huey Joshua Yeh; Christopher A. Siedlecki; Erwin A. Vogler
Source:
Biomaterials 2011 v.32 no.36 pp. 9747-9757
ISSN:
0142-9612
Subject:
adhesion; amino acids; blood coagulation; blood plasma; coagulation; contact angle; energy; enzyme activity; enzymes; hydrophilicity; hydrophobicity; proteins; surface tension
Abstract:
... The relative proportions of enzymes with amidolytic or procoagulant activity produced by contact activation of the blood zymogen factor XII (FXII, Hageman factor) in buffer solution depends on activator surface chemistry/energy. As a consequence, chromogenic assay of amidolytic activity (cleavage of amino acid bonds in s-2302 chromogen) does not correlate with the traditional plasma coagulation ti ...
DOI:
10.1016/j.biomaterials.2011.09.020
PubMed:
21955686
PubMed Central:
PMC3219925

43. Amphiphilic gold nanoparticles: Synthesis, characterization and adsorption to PEGylated polymer surfaces

Author:
Rafael Tarnawski; Mathias Ulbricht
Source:
Colloids and surfaces 2011 v.374 no.1-3 pp. 13-21
ISSN:
0927-7757
Subject:
adsorption; aqueous solutions; atomic force microscopy; coatings; colloids; contact angle; films (materials); gold; hydrophilicity; hydrophobicity; infrared spectroscopy; myoglobin; nanoparticles; polyethylene glycol; polystyrenes; silicon; solubility; spinning; surface plasmon resonance; surfaces; thiols; topography; transmission electron microscopy; ultraviolet-visible spectroscopy
Abstract:
... The direct synthesis of water-soluble gold nanoparticles with a mixed shell of two different thiols, 1-mercaptoundec-11-yl-hexa(ethylene glycol) (EG6) and dodecanethiol (C12), and their characterization are reported. Data from IR spectroscopy and contact angle (CA) measurements as well as the solubility of the nanoparticles in water support that the composition of the shell is in the range of the ...
DOI:
10.1016/j.colsurfa.2010.10.027

44. Antibacterial activity and cytocompatibility of chitosan-N-hydroxy-2,3-propyl-N methyl-N,N-diallylammonium methyl sulfate

Author:
Chi-Hsiung Jou
Source:
Colloids and surfaces 2011 v.88 no.1 pp. 448-454
ISSN:
0927-7765
Subject:
Klebsiella pneumoniae; Staphylococcus aureus; antibacterial properties; cell growth; chitosan; colloids; colorimetry; contact angle; fibroblasts; hydrophilicity; in vitro studies; minimum inhibitory concentration; sulfates
Abstract:
... A water-soluble quaternary ammonium salt of chitosan, chitosan-N-hydroxy-2,3-propyl-N-methyl-N,N-diallylammonium methyl sulfate (MDAACS), was synthesized by reacting chitosan with methyl diallyl ammonium salt (MDAA). The results of water contact angle and swelling ratio showed that the membrane of MDAACS was more hydrophilic than chitosan. The antibacterial activities of MDAACS against Staphylococ ...
DOI:
10.1016/j.colsurfb.2011.07.028

45. Antifouling ultrafiltration membranes made from PAN-b-PEG copolymers: Effect of copolymer composition and PEG chain length

Author:
Xiangrong Chen; Yi Su; Fei Shen; Yinhua Wan
Source:
Journal of membrane science 2011 v.384 no.1-2 pp. 44-51
ISSN:
0376-7388
Subject:
X-radiation; X-ray photoelectron spectroscopy; absorption; artificial membranes; composite polymers; contact angle; fouling; hydrophilicity; scanning electron microscopy; ultrafiltration
Abstract:
... Antifouling ultrafiltration membranes were prepared by polyacrylonitrile-block-polyethylene glycol (PAN-b-PEG) copolymers through immersion precipitation phase inversion method. The effect of copolymer composition and PEG chain length on the structure and property of the block copolymer membranes were investigated. Compared with PAN membranes, PAN-b-PEG copolymer membranes possessed excellent hydr ...
DOI:
10.1016/j.memsci.2011.09.002

46. Biocompatibility studies on polyaniline and polyaniline–silver nanoparticle coated polyurethane composite

Author:
Pranav Kumar Prabhakar; Sai Raj; P.R. Anuradha; Shilpa N. Sawant; Mukesh Doble
Source:
Colloids and surfaces 2011 v.86 no.1 pp. 146-153
ISSN:
0927-7765
Subject:
Bacillus (bacteria); Pseudomonas; biocompatibility; biofilm; biosensors; cell death; coatings; colloids; contact angle; electrochemistry; genes; hydrophilicity; hydrophobicity; inflammation; interleukin-6; nanoparticles; polyurethanes; protein content; tumor necrosis factor-alpha
Abstract:
... Biocompatibility of medical grade polyurethane coated with polyaniline (PANi) and polyaniline–silver nanoparticle composite (PANi–AgNp) is reported here. These modified films showed 23 and 18% of 3T3 L1 cell death when compared to 41% with virgin polyurethane (PU) after 48h of incubation, respectively. All the surfaces elucidated inflammatory response in the form of enhanced expressions of the pro ...
DOI:
10.1016/j.colsurfb.2011.03.033

47. Biodegradable block poly(ester-urethane)s based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) copolymers

Author:
Wenfeng Ou; Handi Qiu; Zhifei Chen; Kaitian Xu
Source:
Biomaterials 2011 v.32 no.12 pp. 3178-3188
ISSN:
0142-9612
Subject:
Fourier transform infrared spectroscopy; adhesion; biocompatibility; biodegradability; blood coagulation; catalysts; cell growth; cell proliferation; composite polymers; contact angle; crystal structure; differential scanning calorimetry; energy; fibroblasts; gel chromatography; hydrophilicity; hydrophobicity; lactate dehydrogenase; melting; mice; molecular weight; nuclear magnetic resonance spectroscopy; polylactic acid; polymerization; polyurethanes; raw materials; scanning electron microscopes; scanning electron microscopy; thermal properties; thermogravimetry; urethane
Abstract:
... A series of block poly(ester-urethane)s (abbreviated as PU3/4HB) based on biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3/4HB) segments were synthesized by a facile way of melting polymerization using 1,6-hexamethylene diisocyanate (HDI) as the coupling agent and stannous octanoate (Sn(Oct)₂) as catalyst, with different 4HB contents and segment lengths. The chemical structure, molec ...
DOI:
10.1016/j.biomaterials.2011.01.031

48. Contact angle and adsorption behavior of carboxylic acids on α-Al₂O₃ surfaces

Author:
David Megias-Alguacil; Elena Tervoort; Cyrill Cattin; Ludwig J. Gauckler
Source:
Journal of colloid and interface science 2011 v.353 no.2 pp. 512-518
ISSN:
0021-9797
Subject:
adsorption; aluminum oxide; ceramics; coatings; contact angle; crystals; gases; hydrophilicity; liquids; pH; propionic acid; solids; surfaces; suspensions; tensiometers; valeric acid; water
Abstract:
... The hydrophilic character of aluminum oxide surfaces may be altered through coating such surfaces with carboxylic acids. The initially hydrophilic nature of the solid substrate changes towards a less hydrophilic character as the bulk concentration and the chain length of the acids increases. The acids employed in this work (propionic, valeric and enanthic) show a certain affinity to the liquid–gas ...
DOI:
10.1016/j.jcis.2010.09.087

49. Control of macrophage responses on hydrophobic and hydrophilic carbon nanostructures

Author:
Young Wook Chun; Wenping Wang; Jungil Choi; Tae-Hyun Nam; Yong-Hee Lee; Kwon-Koo Cho; Yeon-Min Im; Minsoo Kim; Yong-Hwan Gwon; Sang Soo Kang; Jong Duk Lee; Keunwook Lee; Dongwoo Khang; Thomas J. Webster
Source:
Carbon 2011 v.49 no.6 pp. 2092-2103
ISSN:
0008-6223
Subject:
T-lymphocytes; antigens; carbon; contact angle; cytoskeleton; hydrophilicity; hydrophobicity; inflammation; interleukin-6; macrophages; nanofibers; necrosis; prostheses; secretion; titanium; tumor necrosis factor-alpha; wettability
Abstract:
... This study monitored the expression of cytokines by macrophages and synaptic antigens on macrophages in contact with hydrophobic (water contact angle was 140°) and hydrophilic (water completely adsorbed within 5s) carbon nanostructures. Results indicated that hydrophilic carbon nanofibers (CNFs) generated the smallest inflammatory response from macrophages compared to hydrophobic CNFs and titanium ...
DOI:
10.1016/j.carbon.2011.01.044

50. Control of the chemical and physical behaviour of silicon surfaces for enhancing the transition from hydrophilic to superhydrophobic surfaces

Author:
Khalil Jradi; Damien Laour; Claude Daneault; Bruno Chabot
Source:
Colloids and surfaces 2011 v.374 no.1-3 pp. 33-41
ISSN:
0927-7757
Subject:
ammonia; biosensors; carbon; chemical composition; chemical control; chemical precipitation; contact angle; electronics; epoxides; hydrophilicity; hydrophobicity; microstructure; optics; organosilicon compounds; roughness; scanning electron microscopy; silica; silicon; sorption; surface area; surfaces; wettability
Abstract:
... In this work, we present a convenient and simple experimental approach based on the modification of chemical and topographical state of silicon surfaces for enhancing the transition from hydrophilic to superhydrophobic surfaces. Using the concept of self assembly technique and chemical deposition process, we have constructed two microstructured silicon substrates: hydrophilic surface (with high su ...
DOI:
10.1016/j.colsurfa.2010.10.050

51. Controlled immobilization of acetylcholinesterase on improved hydrophobic gold nanoparticle/Prussian blue modified surface for ultra-trace organophosphate pesticide detection

Author:
Shuo Wu; Xiaoqin Lan; Wei Zhao; Yuping Li; Lihui Zhang; Hainan Wang; Mei Han; Shengyang Tao
Source:
Biosensors & bioelectronics 2011 v.27 no.1 pp. 82-87
ISSN:
0956-5663
Subject:
acetylcholinesterase; biosensors; contact angle; detection limit; electrochemistry; electrodes; electron transfer; hydrophilicity; hydrophobicity; immobilized enzymes; monocrotophos; nanocomposites; nanogold; surface area; toxicity
Abstract:
... An ultrasensitive amperometric acetylcholinesterase (AChE) biosensor was fabricated by controlled immobilization of AChE on gold nanoparticles/poly(dimethyldiallylammonium chloride) protected Prussian blue (Au–PDDA–PB) nanocomposite modified electrode surface for the detection of organophorous pesticide. The Au–PDDA–PB membrane served as an excellent matrix for the immobilization of enzyme, which ...
DOI:
10.1016/j.bios.2011.06.020

52. Controlled oxygen plasma treatment of single-walled carbon nanotube films improves osteoblastic cells attachment and enhances their proliferation

Author:
Marie Kalbacova; Antonin Broz; Alexander Kromka; Oleg Babchenko; Martin Kalbac
Source:
Carbon 2011 v.49 no.9 pp. 2926-2934
ISSN:
0008-6223
Subject:
Raman spectroscopy; adhesion; carbon; carbon nanotubes; cell adhesion; contact angle; humans; hydrophilicity; microfilaments; osteoblasts; oxidation; oxygen; scanning electron microscopy
Abstract:
... The effects of oxidative treatment of single-walled carbon nanotubes (SWCNTs) on the adhesion and proliferation of human osteoblasts (SAOS-2) were investigated. The surface properties of SWCNTs after oxygen plasma treatment were characterized by contact angle measurement, scanning electron microscopy and Raman spectroscopy. The immunofluorescent staining of vinculin, actin filaments and nuclei was ...
DOI:
10.1016/j.carbon.2011.02.069

53. Development and characterization of porous epoxy monoliths via pore-initiated polymerization

Author:
Jie Tu; Zhongjie Du; Hangquan Li; Chen Zhang
Source:
Colloids and surfaces 2011 v.375 no.1-3 pp. 68-75
ISSN:
0927-7757
Subject:
absorption; acetone; acrylic acid; contact angle; emulsions; epoxides; hydrophilicity; polyacrylic acid; polymerization; porosity; scanning electron microscopy; spectroscopy; surfaces; swelling (materials); transmission electron microscopy; water; wettability
Abstract:
... Hydrophilic surface modification of porous epoxy monoliths was carried out by introducing the initiator into the wall of pores and then polymerizing acrylic acid monomer onto the surface. The porous epoxy monolith was prepared via concentrated emulsion polymerization template. Before fully curing of epoxy, the free radical initiator was immobilized on the pore surface by swelling the porous epoxy ...
DOI:
10.1016/j.colsurfa.2010.11.059

54. Development and impact of sandwich wettability structure for gas distribution media on PEM fuel cell performance

Author:
Yongxin Wang; S. Al Shakhshir; Xianguo Li
Source:
Applied energy 2011 v.88 no.6 pp. 2168-2175
ISSN:
0306-2619
Subject:
coatings; contact angle; droplets; durability; electrolytes; energy; fuel cells; hydrophilicity; hydrophobicity; polymers; porosity; roughness; scanning electron microscopy; silica; water management; wettability
Abstract:
... Water management is one of the key issues related to the performance, durability and cost of polymer electrolyte membrane fuel cells (PEMFCs); and the wettability of gas distribution media (GDM) is critical to the water management. In this study, a novel design is developed for GDM, referred to as sandwich wettability GDM. After being coated with a silica particle/poly(dimethylsiloxane) (PDMS) com ...
DOI:
10.1016/j.apenergy.2010.12.054

55. Effect of clay contents on mechanical and water vapor barrier properties of agar-based nanocomposite films

Author:
Jong-Whan Rhim
Source:
Carbohydrate polymers 2011 v.86 no.2 pp. 691-699
ISSN:
0144-8617
Subject:
X-ray diffraction; agar; clay; clay fraction; contact angle; hydrophilicity; nanoclays; nanocomposites; permeability; polymers; scanning electron microscopy; sodium; tensile strength; water solubility; water vapor
Abstract:
... Agar/clay (Cloisite Na⁺) nanocomposite films with different amount of the nanoclay (0, 2.5, 5, 10, 15, and 20g clay/100g agar) were prepared using a solution intercalation method. Results on X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed well developed intercalated nanocomposite films especially at low level of nanoclay addition, and their properties were greatly influence ...
DOI:
10.1016/j.carbpol.2011.05.010

56. Effect of pH and diethyl dithiophosphate (DTP) treatment on chalcopyrite and tennantite surfaces observed using atomic force microscopy (AFM)

Author:
Himawan T.B.M. Petrus; Tsuyoshi Hirajima; Keiko Sasaki; Hideyuki Okamoto
Source:
Colloids and surfaces 2011 v.389 no.1-3 pp. 266-273
ISSN:
0927-7757
Subject:
adhesion; atomic force microscopy; colloids; contact angle; hydrophilicity; hydrophobicity; minerals; pH; sulfur
Abstract:
... Atomic force microscopy (AFM) has been used to observe the morphology and surface characteristics of chalcopyrite and tennantite treated at pH 4 and 9. Mineral treated with DTP at pH 9 was also observed. It was found that new surface “islands” were formed on the minerals after these treatments. The occurrence of these islands as a product of reaction was amplified with increasing treatment time. A ...
DOI:
10.1016/j.colsurfa.2011.08.015

57. Elaboration of nano-structured grafted polymeric surface

Author:
Tjasa Vrlinic; Dominique Debarnot; Miran Mozetic; Alenka Vesel; Janez Kovac; Arnaud Coudreuse; Gilbert Legeay; Fabienne Poncin-Epaillard
Source:
Journal of colloid and interface science 2011 v.362 no.2 pp. 300-310
ISSN:
0021-9797
Subject:
X-ray photoelectron spectroscopy; adhesion; biocompatibility; chemical composition; coatings; contact angle; hydrophilicity; polyethylene glycol; polypropylenes; surfactants; wettability
Abstract:
... The surface grafting of multi-polymeric materials can be achieved by grafting as components such as polymers poly(N-isopropylacrylamide) and/or surfactant molecules (hexatrimethylammonium bromide, polyoxyethylene sorbitan monolaurate). The chosen grafting techniques, i.e. plasma activation followed by coating, allow a large spectrum of functional groups that can be inserted on the surface controll ...
DOI:
10.1016/j.jcis.2011.06.057

58. Enhanced super-hydrophobic and switching behavior of ZnO nanostructured surfaces prepared by simple solution – Immersion successive ionic layer adsorption and reaction process

Author:
P. Suresh Kumar; J. Sundaramurthy; D. Mangalaraj; D. Nataraj; D. Rajarathnam; M.P. Srinivasan
Source:
Journal of colloid and interface science 2011 v.363 no.1 pp. 51-58
ISSN:
0021-9797
Subject:
X-ray photoelectron spectroscopy; adsorption; biomimetics; coatings; contact angle; cost effectiveness; glass; hydrophilicity; hydrophobicity; lighting; polyethylene terephthalates; reflectance; ultraviolet radiation; zinc oxide
Abstract:
... A simple and cost-effective successive ionic layer adsorption and reaction (SILAR) method was adopted to fabricate hydrophobic ZnO nanostructured surfaces on transparent indium–tin oxide (ITO), glass and polyethylene terephthalate (PET) substrates. ZnO films deposited on different substrates show hierarchical structures like spindle, flower and spherical shape with diameters ranging from 30 to 300 ...
DOI:
10.1016/j.jcis.2011.07.015

59. Enhancing photoinduced hydrophilicity of micro arc oxidized TiO₂ nanostructured porous layers by V-doping

Author:
M.R. Bayati; Roya Molaei; F. Golestani-Fard
Source:
Colloids and surfaces 2011 v.373 no.1-3 pp. 51-60
ISSN:
0927-7757
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; atomic force microscopy; chemical composition; chemical structure; contact angle; electric power; energy; hydrophilicity; nanomaterials; optical properties; oxidation; porosity; scanning electron microscopy; titanium dioxide; topography; ultraviolet-visible spectroscopy; vanadium; water
Abstract:
... This study sheds light on the effect of vanadium doping on hydrophilicity properties of micro arc oxidized TiO₂ porous layers. Pure and V-doped titania layers, with a pore size of 50–400nm, were grown by micro arc oxidation method. Morphology and topography of the layers were studied by SEM and AFM techniques where formation of a porous structure with a rough surface was confirmed. Moreover, phase ...
DOI:
10.1016/j.colsurfa.2010.10.025

60. Enhancing the hydrophilic and antifouling properties of polypropylene nonwoven fabric membranes by the grafting of poly(N-vinyl-2-pyrrolidone) via the ATRP method

Author:
Chanchan Wang; Ranran Feng; Fenglin Yang
Source:
Journal of colloid and interface science 2011 v.357 no.2 pp. 273-279
ISSN:
0021-9797
Subject:
adsorption; bacterial adhesion; bovine serum albumin; contact angle; energy; hydrophilicity; polypropylenes; scanning electron microscopy; sludge; temperature
Abstract:
... In this work, the surface characteristics of poly(N-vinyl-2-pyrrolidone) (PNVP)-modified nonwoven fabric (NWF) membranes and the effects of the surface characteristics on the membranes antifouling properties were investigated. Effects of grafting time, grafting temperature, and monomer concentration on the grafting degree of PNVP were systematically investigated. The effect of grafting degree on t ...
DOI:
10.1016/j.jcis.2011.01.094

61. Estimation of the surface energy of chemically and oxygen plasma-treated regenerated cellulosic fabrics using various calculation models

Author:
Zdenka Peršin; Per Stenius; Karin Stana-Kleinschek
Source:
Textile research journal 2011 v.81 no.16 pp. 1673-1685
ISSN:
0040-5175
Subject:
Lewis acids; bleaching; cellulose; chemical treatment; chloroform; contact angle; energy; ethanol; ethylene glycol; fabrics; geometry; hydrogen bonding; hydrophilicity; models; oxygen; tetrahydrofuran; washing
Abstract:
... The aim of this work was to evaluate and compare the surface energies (SFEs) of regenerated cellulose fabrics modified by washing, bleaching, conventional chemical treatment (slack-mercerization), and plasma treatment. Three commonly used methods of estimating apolar, polar, and acid/base contributions were applied: geometric mean (GM), using diiodomethane (MI) and water as probes; van Oss—Good—Ch ...
DOI:
10.1177/0040517511410110

62. Fabrication of chitosan/poly(caprolactone) nanofibrous scaffold for bone and skin tissue engineering

Author:
K.T. Shalumon; K.H. Anulekha; K.P. Chennazhi; H. Tamura; S.V. Nair; R. Jayakumar
Source:
International journal of biological macromolecules 2011 v.48 no.4 pp. 571-576
ISSN:
0141-8130
Subject:
4',6-diamidino-2-phenylindole; adsorption; aneuploidy; chitosan; contact angle; fibroblasts; humans; hydrophilicity; mice; sarcoma; tissue engineering; toxicity
Abstract:
... Chitosan/poly(caprolactone) (CS/PCL) nanofibrous scaffold was prepared by a single step electrospinning technique. The presence of CS in CS/PCL scaffold aided a significant improvement in the hydrophilicity of the scaffold as confirmed by a decrease in contact angle, which thereby enhanced bioactivity and protein adsorption on the scaffold. The cyto-compatibility of the CS/PCL scaffold was examine ...
DOI:
10.1016/j.ijbiomac.2011.01.020

63. Fabrication of highly porous poly (ɛ-caprolactone) fibers for novel tissue scaffold via water-bath electrospinning

Author:
Hem Raj Pant; Madhav Prasad Neupane; Bishweshwar Pant; Gopal Panthi; Hyun-Ju Oh; Min Ho Lee; Hak Yong Kim
Source:
Colloids and surfaces 2011 v.88 no.2 pp. 587-592
ISSN:
0927-7765
Subject:
X-ray diffraction; cell culture; colloids; contact angle; crystal structure; cytotoxicity; differential scanning calorimetry; ethylene glycol; hydrophilicity; in vitro studies; mice; osteoblasts; polyethylene glycol; scanning electron microscopy
Abstract:
... Highly porous fibers were prepared by water-bath electrospinning from pure poly(ɛ-caprolactone) (PCL), and its blends with methoxy poly(ethylene glycol) (MPEG). These fibers were further analyzed by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and gravimetric as well as contact angle measurement. SEM images showed that the fibers diameters a ...
DOI:
10.1016/j.colsurfb.2011.07.045

64. Grafted porous PTFE/partially fluorinated sulfonated poly(arylene ether ketone) composite membrane for PEMFC applications

Author:
Cheng Bi; Huamin Zhang; Shaohua Xiao; Yu Zhang; Zhensheng Mai; Xianfeng Li
Source:
Journal of membrane science 2011 v.376 no.1-2 pp. 170-178
ISSN:
0376-7388
Subject:
artificial membranes; contact angle; electrodes; fuel cells; hydrophilicity; hydrophobicity; polytetrafluoroethylene; sulfur
Abstract:
... A low cost and mechanically stabilized composite membrane (25μm) based on grafted porous polytetrafluoroethylene (grPTFE) substrate and partially fluorinated sulfonated poly(arylene ether ketone) (FSPAEK) polymer was fabricated and investigated for proton exchange membrane fuel cell (PEMFC) applications. In order to improve interfacial compatibility between hydrocarbon membrane and Nafion® bonded ...
DOI:
10.1016/j.memsci.2011.04.017

65. Highly chlorine-resistant end-group crosslinked sulfonated-fluorinated poly(arylene ether) for reverse osmosis membrane

Author:
Young-Jea Kim; Kwan-Soo Lee; Myung-Hwan Jeong; Jae-Suk Lee
Source:
Journal of membrane science 2011 v.378 no.1-2 pp. 512-519
ISSN:
0376-7388
Subject:
X-ray photoelectron spectroscopy; artificial membranes; chlorine; contact angle; crosslinking; fluorine; hydrophilicity; molecular weight; permeability; polymers; reverse osmosis; sodium chloride; sodium hypochlorite
Abstract:
... Crosslinked (C-ESFx-BP) and non-crosslinked (N-ESFx-BP) sulfonated poly(arylene ether) (SPAE) membranes containing high fluorine contents were prepared as a function of the degree of sulfonation (DS) and evaluated for use as a highly potential chlorine-resistant reverse osmosis (RO) membrane. C-ESFx-BP membranes were obtained by covalent crosslinking among ethynyl end groups of the polymer chains ...
DOI:
10.1016/j.memsci.2011.05.040

66. Highly effective antifouling performance of N-vinyl-2-pyrrolidone modified polypropylene non-woven fabric membranes by ATRP method

Author:
Ranran Feng; Chanchan Wang; Xiaochen Xu; Fenglin Yang; Guangjing Xu; Tao Jiang
Source:
Journal of membrane science 2011 v.369 no.1-2 pp. 233-242
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; X-ray fluorescence spectroscopy; artificial membranes; bacteria; bacterial adhesion; contact angle; hydrophilicity; ozone; polymerization; polypropylenes; scanning electron microscopy; sludge
Abstract:
... In this paper, a hydrophilic polymer, poly(N-vinyl-2-pyrrolidone) (PNVP), was grafted on the surface of polypropylene non-woven fabric (PP-NWF) membrane via ozone surface activation and surface-initiated atom transfer radical polymerization (ATRP). The grafting degree of PNVP on the membrane surface can be modulated in a wide range through the variation of grafting time. Chemical and morphological ...
DOI:
10.1016/j.memsci.2010.11.072

67. Human plasma protein adsorption onto dextranized surfaces: A two-dimensional electrophoresis and mass spectrometry study

Author:
Irene Y. Tsai; Nancy Tomczyk; Joshua I. Eckmann; Russell J. Composto; David M. Eckmann
Source:
Colloids and surfaces 2011 v.84 no.1 pp. 241-252
ISSN:
0927-7765
Subject:
adsorption; atomic force microscopy; bioactive properties; biocompatible materials; blood serum; coatings; colloids; contact angle; dextran; endothelial cells; fibrinogen; haptoglobins; humans; hydrophilicity; hydrophobicity; immunoglobulins; mass spectrometry; medical equipment; polyurethanes; serum albumin; silicon; thrombosis; topography; two-dimensional gel electrophoresis
Abstract:
... Protein adsorption is fundamental to thrombosis and to the design of biocompatible materials. We report a two-dimensional electrophoresis and mass spectrometry study to characterize multiple human plasma proteins adsorbed onto four different types of model surfaces: silicon oxide, dextranized silicon, polyurethane and dextranized polyurethane. Dextran was grafted onto the surfaces of silicon and p ...
DOI:
10.1016/j.colsurfb.2011.01.006
PubMed:
21277175
PubMed Central:
PMC3079350

68. Hydrophobic/superhydrophobic oxidized metal surfaces showing negligible contact angle hysteresis

Author:
Atsushi Hozumi; Dalton F. Cheng; Makoto Yagihashi
Source:
Journal of colloid and interface science 2011 v.353 no.2 pp. 582-587
ISSN:
0021-9797
Subject:
X-ray photoelectron spectroscopy; aluminum; atomic force microscopy; contact angle; droplets; hydrophilicity; hydrophobicity; hysteresis; nanoparticles; oxides; particle size; siloxanes; surfaces; temperature; titanium; vapors; wettability
Abstract:
... Dynamic wettability of oxidized metal (aluminum and titanium) surfaces could be tuned by chemical vapor deposition (CVD) of 1,3,5,7-tetramethylcyclotetrasiloxane (D₄ ᴴ). This facile CVD method produces not only monomeric layers but also particulate films by changing the CVD temperature, resulting in a marked difference in the final wetting properties. In the samples prepared at 80°C for ∼3days, D₄ ...
DOI:
10.1016/j.jcis.2010.09.075
PubMed:
20970808

69. Immobilization of anti-CD31 antibody on electrospun poly(ɛ-caprolactone) scaffolds through hydrophobins for specific adhesion of endothelial cells

Author:
Min Zhang; Zhexiang Wang; Zefang Wang; Shuren Feng; Haijin Xu; Qiang Zhao; Shufang Wang; Jianxin Fang; Mingqiang Qiao; Deling Kong
Source:
Colloids and surfaces 2011 v.85 no.1 pp. 32-39
ISSN:
0927-7765
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adhesion; antibodies; bioactive properties; biocompatibility; cell proliferation; coatings; colloids; contact angle; endothelial cells; hydrophilicity; hydrophobicity; hydrophobins; nanofibers; protein-protein interactions; tissue engineering
Abstract:
... Hydrophilicity improvement and bioactive surface design of poly(ɛ-caprolactone) (PCL) grafts are of key importance for their application in tissue engineering. Herein, we develop a convenient approach for achieving stable hydrophilic surfaces by modifying electrospun PCL grafts with a class II hydrophobin (HFBI) coating. Static water contact angles (WCA) demonstrated the conversion of the PCL graf ...
DOI:
10.1016/j.colsurfb.2010.10.042

70. Immobilization of bovine serum albumin onto porous polyethylene membranes using strongly attached polydopamine as a spacer

Author:
Li-Ping Zhu; Jin-Hong Jiang; Bao-Ku Zhu; You-Yi Xu
Source:
Colloids and surfaces 2011 v.86 no.1 pp. 111-118
ISSN:
0927-7765
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adhesion; aqueous solutions; blood platelets; bovine serum albumin; cell adhesion; cell culture; cell viability; coatings; colloids; contact angle; dipping; dopamine; hydrophilicity; polyethylene
Abstract:
... Based on the self-polymerization and strong adhesion characteristics of dopamine in aqueous solution, a novel and convenient approach was developed to immobilize protein onto porous polyethylene (PE) membranes. A thin polydopamine (pDA) layer was formed and tightly coated onto PE membrane by dipping simply the membrane into dopamine aqueous solution for a period of time. Subsequently, bovine serum ...
DOI:
10.1016/j.colsurfb.2011.03.027

71. Improvement of homogeneity and interfacial properties of radiation grafted membranes for fuel cells using diisopropenylbenzene crosslinker

Author:
H. Ben youcef; Lorenz Gubler; Annette Foelske-Schmitz; Günther G. Scherer
Source:
Journal of membrane science 2011 v.381 no.1-2 pp. 102-109
ISSN:
0376-7388
Subject:
X-ray photoelectron spectroscopy; artificial membranes; contact angle; crosslinking; dielectric spectroscopy; dimensional stability; fuel cells; hydrogen; hydrophilicity; infrared spectroscopy; styrene
Abstract:
... A novel crosslinked radiation grafted poly(ethylene-alt-tetrafluoroethylene) (ETFE) based membrane has been obtained by use of the crosslinker 1,3-diisopropenylbenzene (DIPB). The investigated membranes are based on 25μm thick ETFE film grafted with styrene/DIPB. Grafted films and proton-exchange membranes with varying DIPB concentration and fixed graft level (∼25%) were prepared. The influence of ...
DOI:
10.1016/j.memsci.2011.07.021

72. Improving the filtration performance of ZrO₂ membrane in non-polar organic solvents by surface hydrophobic modification

Author:
Nengwen Gao; Mei Li; Wenheng Jing; Yiqun Fan; Nanping Xu
Source:
Journal of membrane science 2011 v.375 no.1-2 pp. 276-283
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; artificial membranes; ceramics; contact angle; emulsions; filtration; fouling; hydrophilicity; hydrophobicity; oils; porosity; scanning electron microscopy; solvents
Abstract:
... Recently, ceramic membranes have been used increasingly in the treatment of non-polar organic solvents, such as oil purifying. The presence of water in organic solvents leads to membrane fouling, because of the hydrophilic property of ceramic membranes. To improve the filtration performance, surface hydrophobic modification was conducted in this study. ZrO₂ membranes with a mean pore size of 0.2μm ...
DOI:
10.1016/j.memsci.2011.03.056

73. Influence of cell surface characteristics on adhesion of Saccharomyces cerevisiae to the biomaterial hydroxylapatite

Author:
White, Jane S.; Walker, Graeme M.
Source:
Antonie van Leeuwenhoek 2011 v.99 no.2 pp. 201-209
ISSN:
0003-6072
Subject:
Saccharomyces cerevisiae; Scotch whisky; adhesion; biocompatible materials; cell adhesion; contact angle; energy; hydrophilicity; hydrophobicity; solvents; yeasts
Abstract:
... The influence of the physicochemical properties of biomaterials on microbial cell adhesion is well known, with the extent of adhesion depending on hydrophobicity, surface charge, specific functional groups and acid-base properties. Regarding yeasts, the effect of cell surfaces is often overlooked, despite the fact that generalisations may not be made between closely related strains. The current in ...
DOI:
10.1007/s10482-010-9477-6

74. Initial bacterial attachment in slow flowing systems: Effects of cell and substrate surface properties

Author:
Hua Wang; Maysam Sodagari; Yajie Chen; Xin He; Bi-min Zhang Newby; Lu-Kwang Ju
Source:
Colloids and surfaces 2011 v.87 no.2 pp. 415-422
ISSN:
0927-7765
Subject:
Escherichia coli; Pseudomonas aeruginosa; Pseudomonas putida; bacteria; biofilm; colloids; contact angle; energy; glass; hydrophilicity; hydrophobicity; surface water
Abstract:
... Bacterial biofilm can have significant effects on the behaviors and/or performance of natural and man-made systems. Understanding the factors governing initial bacterial attachment is critical to biofilm management. In this study, the initial attachment of three bacteria, Pseudomonas aeruginosa, Escherichia coli and Pseudomonas putida, on two substrates, glass and octadecyltrichlorosilane (OTS) mo ...
DOI:
10.1016/j.colsurfb.2011.05.053

75. Low‐pressure plasma treatment for hydrophilization of poly(ethylene terephthalate) fabrics

Author:
Isabel C. Gouveia; Laura C. Antunes; Ana P. Gomes
Source:
The journal of the Textile Institute 2011 v.102 no.3 pp. 203-213
ISSN:
1754-2340
Subject:
adsorption; carbon dioxide; cleaning; coatings; contact angle; ethylene; fabrics; hydrogen bonding; hydrophilicity; hydrophobicity; industrial applications; oxygen; packaging; polyethylene terephthalates; scanning electron microscopes; surface roughness; synthetic fibers; wettability
Abstract:
... Synthetic fibers are used in various industrial applications such as packaging, protective coating, and biomedical and sealing materials. However, these polymers have few polar groups. As a result, they have a weak capacity to form hydrogen bonds with water (hydrophilic groups). Hence, low‐pressure plasma treatments have been proposed to modify their surface properties (hydrophobicity and wettabil ...
DOI:
10.1080/00405001003616777

76. Modification of polyethersulfone membrane by blending semi-interpenetrating network polymeric nanoparticles

Author:
Weifeng Zhao; Jingyun Huang; Baohong Fang; Shengqiang Nie; Nan Yi; Baihai Su; Haifeng Li; Changsheng Zhao
Source:
Journal of membrane science 2011 v.369 no.1-2 pp. 258-266
ISSN:
0376-7388
Subject:
artificial membranes; blood; contact angle; crosslinking; hydrophilicity; light scattering; mixing; nanoparticles; polymerization; pyrrolidones; scanning electron microscopes; scanning electron microscopy; thrombin; transmission electron microscopes; transmission electron microscopy
Abstract:
... The present methodology provides a simple approach to prepare semi-interpenetrating network (semi-IPN) polymeric nanoparticles for the modification of polyethersulfone (PES) membranes. The PES/poly (N-vinyl pyrrolidinone) (PVP) semi-IPN nanoparticles were synthesized by cross-linking VP on PES chains via solution polymerization; the size of the nanoparticles ranged from 38 to 820nm determined by d ...
DOI:
10.1016/j.memsci.2010.11.065

77. Nanodrop on a nanorough hydrophilic solid surface: Contact angle dependence on the size, arrangement, and composition of the pillars

Author:
Gersh O. Berim; Eli Ruckenstein
Source:
Journal of colloid and interface science 2011 v.359 no.1 pp. 304-310
ISSN:
0021-9797
Subject:
contact angle; hydrophilicity; roughness
Abstract:
... A two-dimensional nanodrop on a hydrophilic solid surface decorated with nanopillars is examined using a nonlocal density functional theory. It is shown that, in contrast to the commonly used Wenzel formula, even an extremely small roughness can considerably increase the contact angle. The contact angle depends on the distance between pillars, their height and width, as well as their composition. ...
DOI:
10.1016/j.jcis.2011.03.037

78. Novel hybrid scaffolds for the cultivation of osteoblast cells

Author:
Hilal Turkoglu Sasmazel
Source:
International journal of biological macromolecules 2011 v.49 no.4 pp. 838-846
ISSN:
0141-8130
Subject:
Fourier transform infrared spectroscopy; absorption; biodegradability; cell culture; cell differentiation; cell growth; chitosan; contact angle; hydrophilicity; mixing; modulus of elasticity; nanofibers; osteoblasts; osteosarcoma; polymers; scanning electron microscopy; tensile strength; tissue scaffolds
Abstract:
... In this study, natural biodegradable polysaccharide, chitosan, and synthetic biodegradable polymer, poly(ɛ-caprolactone) (PCL) were used to prepare 3D, hybrid polymeric tissue scaffolds (PCL/chitosan blend and PCL/chitosan/PCL layer by layer scaffolds) by using the electrospinning technique. The hybrid scaffolds were developed through HA addition to accelerate osteoblast cell growth. Characteristi ...
DOI:
10.1016/j.ijbiomac.2011.07.022

79. PDMS microchip coated with polydopamine/gold nanoparticles hybrid for efficient electrophoresis separation of amino acids

Author:
Ru‐Ping Liang; Xiang‐Ying Meng; Chun‐Ming Liu; Jian‐Ding Qiu
Source:
Electrophoresis 2011 v.32 no.23 pp. 3331-3340
ISSN:
0173-0835
Subject:
adsorption; arginine; biofouling; biomimetics; coatings; contact angle; dopamine; electrophoresis; gold; histidine; hydrophilicity; nanogold; nanoparticles; oxidants; polymerization; proline; reducing agents; scanning electron microscopy; sustainable technology; threonine; valine; wettability
Abstract:
... In this paper, a novel, simple, economical and environmentally friendly method based on in situ chemically induced synthesis strategy was designed and developed for the modification of a poly(dimethylsiloxane) (PDMS) microchip channel with polydopamine/gold nanoparticles (PDA/Au NPs) to create a hydrophilic and biofouling resistant surface. Dopamine as a reductant and a monomer, and HAuCl4 as an o ...
DOI:
10.1002/elps.201100403

80. Pervaporation separation of ethanol/ETBE mixture using poly(lactic acid)/poly(vinyl pyrrolidone) blend membranes

Author:
S. Zereshki; A. Figoli; S.S. Madaeni; F. Galiano; E. Drioli
Source:
Journal of membrane science 2011 v.373 no.1-2 pp. 29-35
ISSN:
0376-7388
Subject:
artificial membranes; case studies; contact angle; ethanol; hydrophilicity; mechanical properties; modulus of elasticity; pervaporation; polylactic acid; polyvinylpyrrolidone; pyrrolidones; scanning electron microscopy
Abstract:
... The pervaporation properties of poly lactic acid (PLA), a natural source polymer, were studied in a polar/non-polar case study. PLA/PVP (poly vinyl pyrrolidone) blend membranes were prepared containing different PVP contents and evaluated in ethanol/ethyl tert-butyl ether azeotropic separation. The swelling and mechanical properties of the membranes were investigated. SEM cross-sectional images sh ...
DOI:
10.1016/j.memsci.2011.02.031

81. Photochemically prepared polysulfone/poly(ethylene glycol) amphiphilic networks and their biomolecule adsorption properties

Author:
Cemil Dizman; Dilek Odaci Demirkol; Sahin Ates; Lokman Torun; Serhan Sakarya; Suna Timur; Yusuf Yagci
Source:
Colloids and surfaces 2011 v.88 no.1 pp. 265-270
ISSN:
0927-7765
Subject:
crosslinking; contact angle; polymerization; biochemical compounds; colloids; hydrophilicity; ethylene glycol; esterification; polyethylene glycol; scanning electron microscopy; hydrophobicity; infrared spectroscopy; adsorption
Abstract:
... Polysulfone/poly(ethylene glycol) amphiphilic networks were prepared via in situ photo-induced free radical crosslinking polymerization. First, the hydrophobic polysulfone diacrylate (PSU-DA) oligomer was synthesized by condensation polymerization and subsequent esterification processes. Then, the obtained oligomer was co-crosslinked with the hydrophilic poly(ethylene glycol) diacrylate (PEG-DA) o ...
DOI:
10.1016/j.colsurfb.2011.06.042

82. Physical and chemical analysis of plasma-treated cotton fabric subjected to wrinkle-resistant finishing

Author:
Lam, Y. L.; Kan, C. W.; Yuen, C. W. M.
Source:
Cellulose 2011 v.18 no.2 pp. 493-503
ISSN:
0969-0239
Subject:
Fourier transform infrared spectroscopy; cellulose; chemical analysis; chemical composition; contact angle; cotton fabric; energy-dispersive X-ray analysis; finishing; hydrophilicity; lint cotton; oxygen; wettability
Abstract:
... Cotton fabrics were treated with oxygen plasma gas and/or wrinkle-resistant finishing agent with polycarboxylic acid. The results of wicking rate, contact angle and wettability tests revealed that the atmospheric plasma treatment significantly improved hydrophilicity of cotton fiber. Such improvement greatly enhances the effectiveness of post-finishing processes. The study showed that chemical com ...
DOI:
10.1007/s10570-011-9498-y

83. Pitch deposition at the solid–liquid interface: Effect of surface hydrophobicity/hydrophilicity and cation specificity

Author:
Roland Lee; Gil Garnier; Trevor Lewis; Desmond Richardson; Theo G.M. Van De Ven; Karen Stack
Source:
Colloids and surfaces 2011 v.388 no.1-3 pp. 84-90
ISSN:
0927-7757
Subject:
calcium; coagulation; colloids; contact angle; hydrophilicity; hydrophobicity; ions; magnesium; microscopy; particle size; salts
Abstract:
... The deposition rate of colloidal pitch onto hydrophobic and hydrophilic model surfaces was measured at the solid–liquid interface by impinging jet microscopy (IJM) and the effect of cation specificity in solution on deposition was quantified. On both model surfaces, the pitch deposition was slightly faster with calcium ions than with magnesium at the same concentration (800mg/L). This concentratio ...
DOI:
10.1016/j.colsurfa.2011.08.019

84. Poly(N-isopropylacrylamide) grafted poly(vinylidene fluoride) copolymers for temperature-sensitive membranes

Author:
Jing-Zhen Yu; Li-Ping Zhu; Bao-Ku Zhu; You-Yi Xu
Source:
Journal of membrane science 2011 v.366 no.1-2 pp. 176-183
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; artificial membranes; chemical concentration; chemical precipitation; chemical structure; composite polymers; contact angle; gamma radiation; hydrophilicity; nuclear magnetic resonance spectroscopy; permeability; pollution; polymerization; porosity; scanning electron microscopy; shrinkage; solutions; solvents; surfaces; suspensions; synthesis; temperature; thermogravimetry; water
Abstract:
... Amphiphilic graft copolymers having poly(vinylidene fluoride) (PVDF) backbones and poly(N-isopropylacrylamide) (PNIPAAm) side chains were synthesized via γ-ray pre-irradiation induced graft polymerization in water phase suspension. No organic solvent was used in the synthesis process, which was harmless to environment. The resulting copolymers, PVDF-g-PNIPAAm, were characterized by nuclear magneti ...
DOI:
10.1016/j.memsci.2010.09.055

85. Preparation and characterization of poly(vinylidene fluoride) (PVDF) based ultrafiltration membranes using nano γ-Al₂O₃

Author:
Fu Liu; M.R. Moghareh Abed; K. Li
Source:
Journal of membrane science 2011 v.366 no.1-2 pp. 97-103
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; aluminum oxide; contact angle; differential scanning calorimetry; fouling; hydrophilicity; nanomaterials; scanning electron microscopy; separation; surfaces; ultrafiltration
Abstract:
... Poly(vinylidene fluoride) (PVDF) based ultrafiltration membranes were prepared from a PVDF/nano γ-Al₂O₃ complex suspension where the γ-Al₂O₃ is well dispersed. The effect of nano γ-Al₂O₃ concentration on the membrane performances was investigated. Surface chemical compositions, surface and cross-section morphologies and hydrophilicity of the membranes were characterized by Fourier transform infrar ...
DOI:
10.1016/j.memsci.2010.09.044

86. Preparation and characterization of sodium caseinate films reinforced with cellulose derivatives

Author:
Mariana Pereda; Guillermina Amica; Ilona Rácz; Norma E. Marcovich
Source:
Carbohydrate polymers 2011 v.86 no.2 pp. 1014-1021
ISSN:
0144-8617
Subject:
films (materials); water solubility; cellulose acetate; opacity; contact angle; mixing; sorption; hydrophilicity; mechanical properties; sodium caseinate; hydrophobicity; solvents; composite materials; water vapor; permeability; carboxymethylcellulose
Abstract:
... Edible composite films, based on glycerol-plasticized sodium caseinate (SC) and either carboxymethyl cellulose (CMC) or cellulose acetate (CA) fibers, were respectively prepared by suspension casting. The effects of mixing SC with very low amounts (up to 3wt%) of CMC or CA were systematically investigated through changes in morphology, surface hydrophilicity, moisture sorption, water vapor permeab ...
DOI:
10.1016/j.carbpol.2011.05.063

87. Preparation and characterization of surface modified silica nanoparticles with organo-silane compounds

Author:
Chang Hun Lee; Sun Hee Park; Wonkeun Chung; Joong Yeon Kim; Sung Hyun Kim
Source:
Colloids and surfaces 2011 v.384 no.1-3 pp. 318-322
ISSN:
0927-7757
Subject:
colloids; contact angle; filtration; hydrophilicity; nanoparticles; nuclear magnetic resonance spectroscopy; pH; purification methods; silica; sol-gel processing; wettability; zeta potential
Abstract:
... In this study, surface functionalized silica nanoparticles were prepared through a continuous two-step sol–gel process. After the TEOS-derived silica particles were synthesized, silane compounds were added during the second sol–gel process without any filtration or purification processes. The introductions of the organic chains to their surfaces were measured using ¹³C solid-state NMR. The effects ...
DOI:
10.1016/j.colsurfa.2011.04.010

88. Preparation, characterization and performance of polyethersulfone/organically modified montmorillonite nanocomposite membranes in removal of pesticides

Author:
Negin Ghaemi; Sayed S. Madaeni; Abdolhamid Alizadeh; Hamid Rajabi; Parisa Daraei
Source:
Journal of membrane science 2011 v.382 no.1-2 pp. 135-147
ISSN:
0376-7388
Subject:
X-ray diffraction; artificial membranes; atomic force microscopy; contact angle; hydrophilicity; mechanical properties; montmorillonite; nanocomposites; nanofiltration; nanomaterials; nitrophenols; pH; pesticides; porosity; scanning electron microscopy; solutes; thermal stability; thermogravimetry; transmission electron microscopy; zeta potential
Abstract:
... Nanocomposite membranes containing polyethersulfone (PES) and organically modified montmorillonite (OMMT) were prepared by a combination of solution dispersion and wet-phase inversion methods and accordingly, the effect of OMMT addition to the properties and performance of fabricated nanofiltration membranes was investigated. The membranes were characterized by contact angle measurement, scanning ...
DOI:
10.1016/j.memsci.2011.08.004

89. Pressure-driven flow in open fluidic channels

Author:
Nicholas Davey; Adrian Neild
Source:
Journal of colloid and interface science 2011 v.357 no.2 pp. 534-540
ISSN:
0021-9797
Subject:
coatings; contact angle; energy; glass; hydrophilicity; hydrophobicity; hysteresis; models
Abstract:
... At the boundary between a hydrophilic and hydrophobic surface coating a large contact angle hysteresis exists which can be used to retain fluid on a flat surface, a similar effect exists at the edge of a solid surface. In this work, pressure-driven flow is used to create fluid flow through a fluid volume confined along a 1mm wide strip of glass. Very high flow rates are shown to be achievable, rea ...
DOI:
10.1016/j.jcis.2011.02.022

90. Recovery of polypropylene and polyethylene from packaging plastic wastes without contamination of chlorinated plastic films by the combination process of wet gravity separation and ozonation

Author:
Mallampati Srinivasa Reddy; Tetsuji Okuda; Satoshi Nakai; Wataru Nishijima; Mitsumasa Okada
Source:
Waste management 2011 v.31 no.8 pp. 1848-1851
ISSN:
0956-053X
Subject:
air; contact angle; gravity; hydrophilicity; mixing; ozonation; packaging; plastic film; poly(vinyl chloride); polyethylene; polypropylenes; recycling; wastes
Abstract:
... Wet gravity separation technique has been regularly practiced to separate the polypropylene (PP) and polyethylene (PE) (light plastic films) from chlorinated plastic films (CP films) (heavy plastic films). The CP films including poly vinyl chloride (PVC) and poly vinylidene chloride (PVDC) would float in water even though its density is more than 1.0g/cm³. This is because films are twisted in whic ...
DOI:
10.1016/j.wasman.2011.03.018

91. Remarkable pH-sensitivity and anti-fouling property of terpolymer blended polyethersulfone hollow fiber membranes

Author:
Chong Cheng; Lang Ma; Danfeng Wu; Jian Ren; Weifeng Zhao; Jimin Xue; Shudong Sun; Changsheng Zhao
Source:
Journal of membrane science 2011 v.378 no.1-2 pp. 369-381
ISSN:
0376-7388
Subject:
X-ray photoelectron spectroscopy; artificial membranes; contact angle; hydrophilicity; mixing; pH; separation; ultrafiltration
Abstract:
... This work presents a detailed study on the pH sensitivity of polyethersulfone (PES) hollow fiber membrane (HFM) modified by blending an amphiphilic terpolymer poly(styrene–acrylic acid–N-vinylpyrrolidone) (P(St–AA–NVP)), the HFM exhibits a pH-responsive behavior with very large water flux change as the pH value change, from nearly 38.64 to 0.64ml/(m²hmmHg). Meanwhile, the influence of the occurred ...
DOI:
10.1016/j.memsci.2011.05.028

92. Role of interface in dispersion and surface energetics of polymer nanocomposites containing hydrophilic POSS and layered silicates

Author:
Qi Zhou; K.P. Pramoda; Jong-Min Lee; Kean Wang; Leslie S. Loo
Source:
Journal of colloid and interface science 2011 v.355 no.1 pp. 222-230
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; contact angle; energy; hydrogen bonding; hydrophilicity; microscopy; models; polymer nanocomposites; silicates; water management
Abstract:
... Three different hydrophilic nanofillers – natural and synthetic layered silicate as well as octaammonium polyhedral oligomeric silsesquioxane (POSS) – were incorporated into polyamide-6 by a solution-mixing method. The surfaces of the resulting polymer nanocomposites were characterized by X-ray diffraction, polarized optical microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron ...
DOI:
10.1016/j.jcis.2010.12.010

93. Sequential patterning of two fluorescent streptavidins assisted by photoactivatable biotin on an aminodextran-coated surface

Author:
Junhyoung Ahn; Yong-Beum Shin; Won-Seok Chang; Min-Gon Kim
Source:
Colloids and surfaces 2011 v.87 no.1 pp. 67-72
ISSN:
0927-7765
Subject:
biotin; colloids; contact angle; ethanolamine; fluorescence; hydrophilicity; ultraviolet radiation
Abstract:
... Sequential patterning of two fluorescent streptavidins (SAvs) was carried out using photopatterning of photoactivatable biotin (photobiotin) on an aminodextran surface, which was crucial for the minimization of non-specific binding. Photobiotin was bound by photoreaction to the amine groups of aminodextran. Water contact angle at each step during the preparation of the aminodextran surface was mea ...
DOI:
10.1016/j.colsurfb.2011.05.002

94. Study of microbial adhesion on some wood species: Theoretical prediction

Author:
Soumya, El abed; Mohamed, Mostakim; Fatimazahra, Berguadi; Hassan, Latrache; Abdellah, Houari; Fatima, Hamadi; Saad, Ibnsouda koraichi
Source:
Microbiology 2011 v.80 no.1 pp. 43-49
ISSN:
0026-2617
Subject:
Bacillus subtilis; Fagus; Tectona grandis; adhesion; contact angle; decayed wood; energy; hydrophilicity; hydrophobicity; microorganisms; prediction; thermodynamics
Abstract:
... The initial interaction between microorganisms and substrata is mediated by physicochemical forces, which in turn originate from the physicochemical surface properties of both interacting phases. In this context, we have determined the physicochemical proprieties of all microorganisms isolated from cedar wood decay in an old monument at the Medina of Fez-Morocco. The cedar wood was also assayed in ...
DOI:
10.1134/S0026261711010152

95. Study of the monolayer structure and wettability properties of silica nanoparticles and CTAB using the Langmuir trough technique

Author:
Eva Santini; Jürgen Krägel; Francesca Ravera; Libero Liggieri; Reinhard Miller
Source:
Colloids and surfaces 2011 v.382 no.1-3 pp. 186-191
ISSN:
0927-7757
Subject:
adsorption; air; cationic surfactants; colloids; contact angle; hydrophilicity; hydrophobicity; nanoparticles; silica; wettability
Abstract:
... This study is focused on understanding how the combination of silica nanoparticles with a cationic surfactant (CTAB) may lead to the formation of different solid-like structures at the water/air interface. In fact, the adsorption of CTAB onto the solid particles’ surface changes their hydrophilic/lipophilic state which becomes more hydrophobic with increasing the surfactant concentrations. This al ...
DOI:
10.1016/j.colsurfa.2010.11.042

96. Superhydrophilic surface modification of copper surfaces by Layer-by-Layer self-assembly and Liquid Phase Deposition of TiO₂ thin film

Author:
Benjamin T. McDonald; Tianhong Cui
Source:
Journal of colloid and interface science 2011 v.354 no.1 pp. 1-6
ISSN:
0021-9797
Subject:
films (materials); solutions; energy; contact angle; copper; surface area; thermal stress; titanium dioxide; hydrophilicity; durability; liquids; scanning electron microscopy; surfaces; hydrophobicity; wettability; nanoparticles; spectroscopy
Abstract:
... A new method has been developed for the superhydrophilic surface modification of copper using versatile solution-based fabrication techniques. The high surface area of TiO₂ nanoparticles was exploited to create a thin film with increased surface energy that transformed copper materials from relatively hydrophobic to superhydrophilic. Copper exposed to ambient conditions resulting in a thin layer o ...
DOI:
10.1016/j.jcis.2010.09.036

97. Superhydrophobic surfaces from hydrophobic or hydrophilic polymers via nanophase separation or electrospinning/electrospraying

Author:
S.K. Papadopoulou; C. Tsioptsias; A. Pavlou; K. Kaderides; S. Sotiriou; C. Panayiotou
Source:
Colloids and surfaces 2011 v.387 no.1-3 pp. 71-78
ISSN:
0927-7757
Subject:
colloids; contact angle; hydrophilic polymers; hydrophilicity; hydrophobicity; particle size
Abstract:
... This paper explores the role of the hydrophobic or hydrophilic character of a polymer on its potential to produce superhydrophobic surfaces when processed by appropriate techniques. More precisely, porous films of poly(ethyl methacrylate) (PEMA) and polycarbonate (PC) were prepared by the electrospinning/electrospraying method while solutions of poly(methyl methacrylate) (PMMA), PEMA, PC and PEMA– ...
DOI:
10.1016/j.colsurfa.2011.07.028

98. Superhydrophobic surfaces using selected zinc oxide microrod growth on ink-jetted patterns

Author:
Myo Tay Zar Myint; Rungrot Kitsomboonloha; Sunandan Baruah; Joydeep Dutta
Source:
Journal of colloid and interface science 2011 v.354 no.2 pp. 810-815
ISSN:
0021-9797
Subject:
contact angle; hydrophilicity; hydrophobicity; nanocrystals; roughness; topography; zinc oxide
Abstract:
... The synthesis and properties of superhydrophobic surfaces based on binary surface topography made of zinc oxide (ZnO) microrod-decorated micropatterns are reported. ZnO is intrinsically hydrophilic but can be utilized to create hydrophobic surfaces by creating artificial roughness via microstructuring. Micron scale patterns consisting of nanocrystalline ZnO seed particles were applied to glass sub ...
DOI:
10.1016/j.jcis.2010.11.004

99. Surface hydrophilic modification of RO membranes by plasma polymerization for low organic fouling

Author:
L. Zou; I. Vidalis; D. Steele; A. Michelmore; S.P. Low; J.Q.J.C. Verberk
Source:
Journal of membrane science 2011 v.369 no.1-2 pp. 420-428
ISSN:
0376-7388
Subject:
X-ray photoelectron spectroscopy; artificial membranes; cleaning; coatings; contact angle; filtration; fouling; hydrophilicity; plasma membrane; polymerization; triethylene glycol
Abstract:
... Triethylene glycol dimethyl ether (triglyme), a polyethylene glycol (PEG)-like hydrophilic polymer, was deposited by plasma polymerization to reduce RO membrane's organic fouling tendency. This method has the great advantage of achieving modification in one single step. A series of plasma deposition experiments were undertaken. The successful coating of the polymer was confirmed by X-ray photoelec ...
DOI:
10.1016/j.memsci.2010.12.023

100. Surface modification of PDMS by surface-initiated atom transfer radical polymerization of water-soluble dendronized PEG methacrylate

Author:
Zhiyun Zhang; Jianchun Wang; Qin Tu; Nan Nie; Jun Sha; Wenming Liu; Rui Liu; Yanrong Zhang; Jinyi Wang
Source:
Colloids and surfaces 2011 v.88 no.1 pp. 85-92
ISSN:
0927-7765
Subject:
X-ray photoelectron spectroscopy; adhesion; adsorption; bacteria; cell adhesion; colloids; contact angle; hydrophilicity; infrared spectroscopy; polymerization; wettability
Abstract:
... The current paper reports the synthesis of a highly hydrophilic, antifouling dendronized poly(3,4,5-tris(2-(2-(2-hydroxylethoxy)ethoxy)ethoxy)benzyl methacrylate) (PolyPEG) brush using surface initiated atom transfer radical polymerization (SI-ATRP) on PDMS substrates. The PDMS substrates were first oxidized in H₂SO₄/H₂O₂ solution to transform the Si–CH₃ groups on their surfaces into Si–OH groups. ...
DOI:
10.1016/j.colsurfb.2011.06.019