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You searched for: Journal name Langmuir Remove constraint Journal name: Langmuir Publication year rev 7988-2012 Remove constraint Publication year rev: 7988-2012 Source 2012 v.28 no.49 Remove constraint Source: 2012 v.28 no.49
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1. Adsorption Behaviors of Cationic Surfactants and Wettability in Polytetrafluoroethylene–Solution–Air Systems

Author:
Liu Dan-Dan; Xu Zhi-Cheng; Zhang Lei; Luo Lan; Zhang Lu; Wei Tian-Xin; Zhao Sui
Source:
Langmuir 2012 v.28 no.49 pp. 16845-16854
ISSN:
1520-5827
Subject:
adsorption; ammonium chloride; aqueous solutions; cationic surfactants; contact angle; hydrogen bonding; hydrophobic bonding; micelles; polyethylene glycol; polytetrafluoroethylene; wettability
Abstract:
... Measurements of the advancing contact angle (θ) and adsorption properties were carried out for aqueous solutions of four cationic surfactants, hexadecanol glycidyl ether ammonium chloride (C₁₆PC), Guerbet alcohol hexadecyl glycidyl ether ammonium chloride (C₁₆GPC), hexadecanol polyoxyethylene(3) glycidyl ether ammonium chloride(C₁₆(EO)₃PC), and Guerbet alcohol hexadecyl polyoxyethylene(3) glycidyl ...
DOI:
10.1021/la304049z

2. AgAu Bimetallic Janus Nanoparticles and Their Electrocatalytic Activity for Oxygen Reduction in Alkaline Media

Author:
Song Yang; Liu Ke; Chen Shaowei
Source:
Langmuir 2012 v.28 no.49 pp. 17143-17152
ISSN:
1520-5827
Subject:
X-ray photoelectron spectroscopy; adsorption; contact angle; gold; ligands; nanoparticles; nanosilver; oxygen; silver; transmission electron microscopy; ultraviolet-visible spectroscopy
Abstract:
... Bimetallic AgAu Janus nanoparticles were prepared by galvanic exchange reactions of 1-hexanethiolate-passivated silver (AgC6) nanoparticles with gold(I)-mercaptopropanediol complex. The AgC6 nanoparticles were deposited onto a solid substrate surface by the Langmuir–Blodgett method such that the galvanic exchange reactions were limited to the top face of the nanoparticles that was in direct contac ...
DOI:
10.1021/la303513x

3. Anomalous Diffusion Kinetics of the Precursor Film That Spreads from Polymer Droplets

Author:
Mate C. Mathew
Source:
Langmuir 2012 v.28 no.49 pp. 16821-16827
ISSN:
1520-5827
Subject:
droplets; polydimethylsiloxane; silane
Abstract:
... The radii R of the area wetted by precursor films spreading from small droplets of polymer liquids are found to vary as R ∼ tν with ν = 0.31–0.42, in contradiction to the 0.5 exponent indicated in previous studies. The experiments reported here are for three of the same polymer liquids used in the previous studiesmethyl-terminated polydimethylsiloxane (PDMS), tetrakis(2-ethylhexoxy)silane, and sq ...
DOI:
10.1021/la3041117

4. Biochemical-, Biophysical-, and Microarray-Based Antifungal Evaluation of the Buffer-Mediated Synthesized Nano Zinc Oxide: An in Vivo and in Vitro Toxicity Study

Author:
Patra Prasun; Mitra Shouvik; Debnath Nitai; Goswami Arunava
Source:
Langmuir 2012 v.28 no.49 pp. 16966-16978
ISSN:
1520-5827
Subject:
Aspergillus niger; Fourier transform infrared spectroscopy; Fusarium oxysporum; Western blotting; acetylcholinesterase; acute toxicity; agricultural sciences; antifungal properties; ascorbate peroxidase; bioavailability; catalase; dietary exposure; dose response; energy-dispersive X-ray analysis; enzyme activity; fungal morphology; fungi; fungicides; glutathione-disulfide reductase; hydrazine; intravenous injection; lactate dehydrogenase; lipid peroxidation; microarray technology; nanoparticles; oxidative stress; physicochemical properties; proline; spectral analysis; superoxide dismutase; tetrazolium; thiols; transmission electron microscopy; zinc oxide
Abstract:
... Here we describe a simple, novel method of zinc oxide nanoparticle (ZNP) synthesis and physicochemical characterization. The dose-dependent antifungal effect of ZNPs, compared to that of micronized zinc oxide (MZnO), was studied on two pathogenic fungi: Aspergillus niger and Fusarium oxysporum. Superoxide dismutase (SOD) activity, ascorbate peroxidase activity, catalase activity, glutathione reduc ...
DOI:
10.1021/la304120k

5. Comparison of Different Amino-Functionalization Procedures on a Selection of Metal Oxide Microparticles: Degree of Modification and Hydrolytic Stability

Author:
Sakeye Motolani; Smått Jan-Henrik
Source:
Langmuir 2012 v.28 no.49 pp. 16941-16950
ISSN:
1520-5827
Subject:
X-ray diffraction; adsorption; biocompatible materials; chemical bonding; chromatography; drugs; electrostatic interactions; ethyleneimine; microparticles; nitrogen; pH; phosphates; polymerization; porous media; scanning electron microscopy; silica; silicon; thermogravimetry; tin dioxide; titanium dioxide; zeta potential
Abstract:
... Amino-modified metal oxide materials are essential in a wide range of applications, including chromatography, ion adsorption, and as biomaterials. The aim of this study is to compare different functionalization techniques on a selection of metal oxides (SiO₂, TiO₂, ZrO₂, and SnO₂) in order to determine which combination has the optimal properties for a certain application. We have used the nanocas ...
DOI:
10.1021/la303925x

6. Competition of Hydrophobic Steroids with Sodium Dodecyl Sulfate, Dodecyltrimethylammonium Bromide, or Dodecyl β-d-maltoside for the Dodecane/Water Interface

Author:
Feng Shaoxin; Bummer Paul M.
Source:
Langmuir 2012 v.28 no.49 pp. 16927-16932
ISSN:
1520-5827
Subject:
Gibbs free energy; air; bromides; equations; hydrophobicity; prediction; progesterone; sodium dodecyl sulfate; solutes; steroids; surface tension; surfactants; synergism; testosterone
Abstract:
... The surface tension lowering abilities of insoluble steroids, progesterone and testosterone, were examined at the dodecane/water interface in the presence and absence of surfactants, sodium dodecyl sulfate, dodecyltrimethylammonium bromide, and dodecyl maltoside. In the absence of these surfactants, the steroids significantly lowered the interfacial tension while exhibiting no activity at the air/ ...
DOI:
10.1021/la303751e

7. Controlling the Particle Size of ZrO2 Nanoparticles in Hydrothermally Stable ZrO2/MWCNT Composites

Author:
Liu Changchang; Lee Sungchul; Su Dong; Lee Byeongdu; Lee Sungsik; Winans Randall E.; Yin Chunrong; Vajda Stefan; Pfefferle Lisa; Haller Gary L.
Source:
Langmuir 2012 v.28 no.49 pp. 17159-17167
ISSN:
1520-5827
Subject:
X-ray diffraction; annealing; biomass; carbon nanotubes; catalytic activity; nanoparticles; oxygen; particle size; temperature; transmission electron microscopy
Abstract:
... The composite of multiwalled carbon nanotubes (MWCNTs) decorated with ZrO₂ nanoparticles, synthesized by a grafting method followed by high-temperature annealing, was studied. The oxygen functionalized MWCNT surface uniformly disperses and stabilizes the oxide nanoparticles to an extent that is controlled by the metal oxide loading and thermal annealing temperature. This ZrO₂/MWCNT also withstands ...
DOI:
10.1021/la303545y

8. Dendritic Brushes under Good Solvent Conditions: A Simulation Study

Author:
Gergidis Leonidas N.; Kalogirou Andreas; Vlahos Costas
Source:
Langmuir 2012 v.28 no.49 pp. 17176-17185
ISSN:
1520-5827
Subject:
mathematical models; mathematical theory; molecular dynamics; polymers; solvents
Abstract:
... The structural properties of polymer brushes, formed by dendron polymers up to the third generation, were studied by means of Brownian dynamics simulations for the macroscopic state of good solvent. The distributions of polymer units, of the free ends, of the dendrons centers of mass, and of the units of every dendritic generation and the radii of gyration necessary for the understanding of the in ...
DOI:
10.1021/la3039957

9. Directed Self-Assembly of Densely Packed Gold Nanoparticles

Author:
Asbahi Mohamed; Lim Kevin T. P.; Wang Fuke; Duan Huigao; Thiyagarajah Naganivetha; Ng Vivian; Yang Joel K. W.
Source:
Langmuir 2012 v.28 no.49 pp. 16782-16787
ISSN:
1520-5827
Subject:
information storage; liquids; nanogold; nanoparticles; silicon
Abstract:
... Directing the self-assembly of sub-10-nm nanoparticles has been challenging because of the simultaneous requirements to achieve a densely packed monolayer and rearrange nanoparticles to assemble within a template. We met both requirements by separating the processes into two steps by first forming a monolayer of gold nanoparticles on a suitable liquid subphase of anisole and then transferring it e ...
DOI:
10.1021/la303287z

10. The Dynamics of Polymer Bridge Formation and Disruption and Its Effect on the Bulk Rheology of Suspensions

Author:
Bhosale Prasad S.; Berg John C.
Source:
Langmuir 2012 v.28 no.49 pp. 16807-16811
ISSN:
1520-5827
Subject:
adhesion; atomic force microscopy; ceramics; cleavage (chemistry); gels; polyethylene glycol; rheology; silica; slurries; storage modulus; waste treatment
Abstract:
... Bridge-flocculated colloidal gels are used in many important processes and products such as gel casting for advanced ceramics, precursor inks for 3D printing, and waste treatment strategies. An important aspect of polymer bridged gels that makes them excellent candidates for these applications is the precise control it affords for control of rheological properties. Recent studies have shown that a ...
DOI:
10.1021/la3039297

11. Electrospun Fibrous Mats on Lithographically Micropatterned Collectors to Control Cellular Behaviors

Author:
Liu Yaowen; Zhang Lei; Li Huinan; Yan Shili; Yu Junsheng; Weng Jie; Li Xiaohong
Source:
Langmuir 2012 v.28 no.49 pp. 17134-17142
ISSN:
1520-5827
Subject:
adverse effects; cell viability; collagen; collectors; glass; microscopy; silver; staining; tissues
Abstract:
... Spatial arrangement of multiple cell types plays a critical role in maintaining the viability of cells and functionality of tissues. Micropatterning has been used to fabricate scaffolds to modulate cell distribution, growth, and functions for reconstructing the anisotropy in native tissues. In the current study, a glass substrate patterned with an electrically conductive circuit was prepared by li ...
DOI:
10.1021/la303490x

12. A Gene-Networked Gel Matrix-Supported Lipid Bilayer as a Synthetic Nucleus System

Author:
Bae Sun Ju; Song Woo Chul; Jung Sung Hwan; Cho Seung-Woo; Kim Dong-Ik; Um Soong Ho
Source:
Langmuir 2012 v.28 no.49 pp. 17036-17042
ISSN:
1520-5827
Subject:
cell free system; cell-free protein synthesis; gels; genes; green fluorescent protein; lipid bilayers; lipids; messenger RNA; nanotechnology; plasmids
Abstract:
... A spheroidal transgene-networked gel matrix was designed as a synthetic nucleus system. It was spheroidically manufactured using both advanced lithography and DNA nanotechnology. Stable Aqueorea coerulescens green fluorescent protein (AcGFP)-encoding gene cross-networks have been optimized in various parameters: the number of gene-networked gel (G-net-gel) spheroids, the concentration of a AcGFP p ...
DOI:
10.1021/la303498k

13. High-Resolution Imaging of Chemical and Biological Sites on Living Cells Using Peak Force Tapping Atomic Force Microscopy

Author:
Alsteens David; Dupres Vincent; Yunus Sami; Latgé Jean-Paul; Heinisch Jürgen J.; Dufrêne Yves F.
Source:
Langmuir 2012 v.28 no.49 pp. 16738-16744
ISSN:
1520-5827
Subject:
atomic force microscopy; hydrophobicity; image analysis; mechanical properties; pathogens; proteins; yeasts
Abstract:
... Currently, there is a growing need for methods that can quantify and map the molecular interactions of biological samples, both with high-force sensitivity and high spatial resolution. Force–volume imaging is a valuable atomic force microscopy (AFM) modality for probing specific sites on biosurfaces. However, the low speed and poor spatial resolution of this method have severely hampered its wides ...
DOI:
10.1021/la303891j

14. Highly Ordered Fe–Au Heterostructured Nanorod Arrays and Their Exceptional Near-Infrared Plasmonic Signature

Author:
Zhang Yong; Ashall Brian; Doyle Gillian; Zerulla Dominic; Lee Gil U.
Source:
Langmuir 2012 v.28 no.49 pp. 17101-17107
ISSN:
1520-5827
Subject:
electromagnetic radiation; nanorods; spectroscopy
Abstract:
... The potential of highly ordered array nanostructures in sensing applications is well recognized, particularly with the ability to define the structural composition and arrangement of the individual nanorods accurately. The use of heterogeneous nanostructures generates an additional degree of freedom, which can be used to tailor the optical response of such arrays. In this article, we report on the ...
DOI:
10.1021/la302290v

15. Increased Evaporation Kinetics of Sessile Droplets by Using Nanoparticles

Author:
Nguyen Tuan A. H.; Nguyen Anh V.
Source:
Langmuir 2012 v.28 no.49 pp. 16725-16728
ISSN:
1520-5827
Subject:
air; droplets; equations; evaporation rate; nanoparticles; prediction; surfactants
Abstract:
... The effect of nanoparticles on the evaporation of a sessile droplet into air is still controversial. Unlike insoluble surfactants which reduce the droplet evaporation rate, here we show that the presence of nanoparticles and the increase of their concentration lead to an increase in the overall rate of diffusive evaporation and, consequently, a decrease of the droplet lifetime. The nanoparticles a ...
DOI:
10.1021/la303293w

16. The Influence of Surface Structure on H4SiO4 Oligomerization on Rutile and Amorphous TiO2 Surfaces: An ATR-IR and Synchrotron XPS Study

Author:
Song Yantao; Swedlund Peter J.; McIntosh Grant J.; Cowie Bruce C. C.; Waterhouse Geoffrey I. N.; Metson James B.
Source:
Langmuir 2012 v.28 no.49 pp. 16890-16899
ISSN:
1520-5827
Subject:
X-ray photoelectron spectroscopy; energy; geometry; models; oligomerization; oxygen; polymerization; polymers; silicates; silicic acid; silicon; sorption; titanium dioxide
Abstract:
... Silicic acid (H₄SiO₄) is ubiquitous in natural aquatic systems. Applications of TiO₂ in these systems will be influenced by H₄SiO₄ sorption and oligomerization reactions on the TiO₂ surface, and this can affect many aspects of TiO₂ reactivity. The spatial arrangement of sorption sites on a metal oxide surface can promote specific lateral interactions, such as oligomerization, between sorbed specie ...
DOI:
10.1021/la3032623

17. Influence of meso-Substituted Tetraphenylporphyrin Derivatives Structure on Their Supramolecular Organization in Floating Layers and Langmuir–Blodgett Films

Author:
Kazak Alexandr V.; Usol’tseva Nadezhda V.; Yudin Sergey G.; Sotsky Valentin V.; Semeikin Alexandr S.
Source:
Langmuir 2012 v.28 no.49 pp. 16951-16957
ISSN:
1520-5827
Subject:
X-ray diffraction; absorption; chemical structure; porphyrins; zinc
Abstract:
... To study the influence of structure peculiarities of porphyrin derivatives on their supramolecular organization in thin films, 15 new meso-substituted tetraphenylporphyrin derivatives and their metal complexes with substituents (−OC₄H₉ or −OC₁₆H₃₃) in para or ortho positions were studied. The films of the studied compounds were obtained by the Langmuir–Schaefer method. The behavior of porphyrin de ...
DOI:
10.1021/la303958q

18. Iron Oxide Filled Magnetic Carbon Nanotube–Enzyme Conjugates for Recycling of Amyloglucosidase: Toward Useful Applications in Biofuel Production Process

Author:
Goh Wei Jiang; Makam Venkata S.; Hu Jun; Kang Lifeng; Zheng Minrui; Yoong Sia Lee; Udalagama Chammika N. B.; Pastorin Giorgia
Source:
Langmuir 2012 v.28 no.49 pp. 16864-16873
ISSN:
1520-5827
Subject:
adsorption; biofuels; biomass; bioreactors; capital; carbon nanotubes; catalytic activity; clean energy; energy; fuel production; hydrolysis; immobilized enzymes; iron oxides; magnetic materials; magnetism; nanoparticles; prototypes; starch
Abstract:
... Biofuels are fast advancing as a new research area to provide alternative sources of sustainable and clean energy. Recent advances in nanotechnology have sought to improve the efficiency of biofuel production, enhancing energy security. In this study, we have incorporated iron oxide nanoparticles into single-walled carbon nanotubes (SWCNTs) to produce magnetic single-walled carbon nanotubes (mSWCN ...
DOI:
10.1021/la303046m

19. Microfluidic Fabrication and Thermoreversible Response of Core/Shell Photonic Crystalline Microspheres Based on Deformable Nanogels

Author:
Hu Yuandu; Wang Jianying; Wang Hong; Wang Qin; Zhu Jintao; Yang Yajiang
Source:
Langmuir 2012 v.28 no.49 pp. 17186-17192
ISSN:
1520-5827
Subject:
color; crystals; encapsulation; microparticles; nanoparticles; optical properties; photons; polymers; temperature
Abstract:
... Soft photonic crystals (PC) are more appealing due to the responsiveness of the building blocking-deformable nanoparticles to the external stimuli. In this report, we demonstrate, for the first time, the generation of soft core/shell PC microspheres through a combination of a microfluidic technique, encapsulation of well-ordered temperature responsive polymer nanogels suspension, and photopolymeri ...
DOI:
10.1021/la304058j

20. Oligothiol Graft-Copolymer Coatings Stabilize Gold Nanoparticles against Harsh Experimental Conditions

Author:
Kang Jun Sung; Taton T. Andrew
Source:
Langmuir 2012 v.28 no.49 pp. 16751-16760
ISSN:
1520-5827
Subject:
coatings; composite polymers; ethylene glycol; fluorescence emission spectroscopy; ligands; light scattering; lysine; nanogold; oxidants; temperature; thermodynamics; thiols; ultraviolet-visible spectroscopy
Abstract:
... We report that poly(l-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) copolymers that bear multiple thiol groups on the polymer backbone are exceptional ligands for gold nanoparticles (AuNPs). In general, these graft copolymer ligands stabilize AuNPs against environments that would ordinarily lead to particle aggregation. To characterize the effect of copolymer structure on AuNP stability, we synt ...
DOI:
10.1021/la301249a
PubMed:
22957513
PubMed Central:
PMC3682508