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You searched for: Publication year rev 7988-2012 Remove constraint Publication year rev: 7988-2012 Subject term cetyltrimethylammonium bromide Remove constraint Subject term: cetyltrimethylammonium bromide Subject term micelles Remove constraint Subject term: micelles Text availability Citation in PubAg Remove constraint Text availability: Citation in PubAg
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1. A model for monomer and micellar concentrations in surfactant solutions: Application to conductivity, NMR, diffusion, and surface tension data

Author:
Wajih Al-Soufi; Lucas Piñeiro; Mercedes Novo
Source:
Journal of colloid and interface science 2012 v.370 no.1 pp. 102-110
ISSN:
0021-9797
Subject:
cetyltrimethylammonium bromide; data analysis; electrical conductivity; micelles; model validation; models; nuclear magnetic resonance spectroscopy; quantitative analysis; surface tension; surfactants; yields
Abstract:
... An empirical model for the concentrations of monomeric and micellized surfactants in solution is presented as a consistent approach for the quantitative analysis of data obtained with different experimental techniques from surfactant solutions. The concentration model provides an objective definition of the critical micelle concentration (cmc) and yields precise and well defined values of derived ...
DOI:
10.1016/j.jcis.2011.12.037

2. Active biocatalysts based on Candida rugosa lipase immobilized in vesicular silica

Author:
Cuicui Wu; Guowei Zhou; Xiaojie Jiang; Jingyun Ma; Huayong Zhang; Hongbin Song
Source:
Process biochemistry 2012 v.47 no.6 pp. 953-959
ISSN:
1359-5113
Subject:
Candida rugosa; Fourier transform infrared spectroscopy; adsorption; anionic surfactants; biocatalysts; catalytic activity; cationic surfactants; cetyltrimethylammonium bromide; enzyme activity; hydrolysis; micelles; nitrogen; pH; phosphates; silica; sodium dodecyl sulfate; temperature; thermal stability; triacetin
Abstract:
... Vesicular silica (VS) with hierarchical structure was prepared by utilizing cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium dodecyl sulfate (SDS) as the structure directing agents, and 1,3,5-triisopropylbenzene (TIPB) as the micelle expander. The resulting unilamellar and multilamellar VS with interlamellar mean mesopore size of 15–20nm and shell thickness o ...
DOI:
10.1016/j.procbio.2012.03.004

3. CTAB/Water/Chloroform Reverse Micelles: A Closed or Open Association Model?

Author:
Klíčová L'ubica; Šebej Peter; Štacko Peter; Filippov Sergey K.; Bogomolova Anna; Padilla Marc; Klán Petr
Source:
Langmuir 2012 v.28 no.43 pp. 15185-15192
ISSN:
1520-5827
Subject:
calorimetry; cetyltrimethylammonium bromide; chlorides; chloroform; micelles; models; nuclear magnetic resonance spectroscopy; surfactants; titration; water content
Abstract:
... The micellization of cetyltrimethylammonium bromide (CTAB) in chloroform in the presence of water was examined. Three scenarios of the reverse micelle formation, the closed, open and Eicke’s association models, were considered in the interpretation of the experimental data. The growth of the aggregates was observed through the changes of NMR signals of associated water, probing the microenvironmen ...
DOI:
10.1021/la303245e

4. Cadmium (II) imprinted 3-mercaptopropyltrimethoxysilane coated stir bar for selective extraction of trace cadmium from environmental water samples followed by inductively coupled plasma mass spectrometry detection

Author:
Nan Zhang; Bin Hu
Source:
Analytica chimica acta 2012 v.723 no. pp. 54-60
ISSN:
0003-2670
Subject:
Fourier transform infrared spectroscopy; adsorption; cadmium; cetyltrimethylammonium bromide; coatings; detection limit; ethanol; glass; ions; lakes; mass spectrometry; micelles; mixing; pH; rain; rapid methods; river water; solvents; surfactants; Yangtze River
Abstract:
... Cd(II) imprinted 3-mercaptopropyltrimethoxysilane (MPTS)-silica coated stir bar was prepared by sol–gel technique combining with a double-imprinting concept for the first time and was employed for stir bar sorptive extraction (SBSE) of trace Cd(II) from water samples followed by inductively coupled plasma mass spectrometry (ICP-MS) detection. A tetramethoxysilane (TMOS) coating was first in situ c ...
DOI:
10.1016/j.aca.2012.02.027

5. Caffeine-Mediated Detachment of Mutagenic Ethidium from Various Nanoscopic Micelles: An Ultrafast Förster Resonance Energy Transfer Study

Author:
Banerjee Soma; Tachiya Masanori; Pal Samir Kumar
Source:
Journal of physical chemistry 2012 v.116 no.27 pp. 7841-7848
ISSN:
1520-5207
Subject:
DNA; aqueous solutions; caffeine; cetyltrimethylammonium bromide; dissociation; energy transfer; epithelial cells; ethidium; fluorescence; micelles; models; mutagens; octoxynol; physical chemistry; sodium dodecyl sulfate; solubilization; spectral analysis
Abstract:
... In the present study we explore the efficacy of caffeine in dissociating the ethidium (Et) molecule, a model DNA-intercalator as well as a potential mutagen, from nanometer sized micelles of various charges. Steady-state and picosecond-resolved spectroscopic studies on the detachment of Et from various biomimicking micelles of different charges (cationic hexadecyltrimethylammonium bromide (CTAB), ...
DOI:
10.1021/jp302734e

6. Cooperative Template-Directed Assembly of Mesoporous Metal–Organic Frameworks

Author:
Sun Lin-Bing; Li Jian-Rong; Park Jinhee; Zhou Hong-Cai
Source:
Journal of the American Chemical Society 2012 v.134 no.1 pp. 126-129
ISSN:
1520-5126
Subject:
cetyltrimethylammonium bromide; chelating agents; citric acid; coordination polymers; micelles; microspores; porous media; surfactants
Abstract:
... Despite great efforts, the development of a reliable way to assemble mesoporous metal–organic frameworks (mesoMOFs) remains a challenge. In this work, we have designed a cooperative template system, comprising a surfactant (cetyltrimethylammonium bromide) and a chelating agent (citric acid), for the generation of a mesoMOF containing a hierarchical system of mesopores interconnected with microspor ...
DOI:
10.1021/ja209698f

7. Correlating Proton Transfer Dynamics To Probe Location in Confined Environments

Author:
Sedgwick Myles; Cole Richard L.; Rithner Christopher D.; Crans Debbie C.; Levinger Nancy E.
Source:
Journal of the American Chemical Society 2012 v.134 no.29 pp. 11904-11907
ISSN:
1520-5126
Subject:
absorption; aqueous solutions; cetyltrimethylammonium bromide; micelles; nuclear magnetic resonance spectroscopy; surfactants
Abstract:
... The dramatic impact of differing environments on proton transfer dynamics of the photoacid HPTS prompted us to investigate these systems with two highly complementary methods: ultrafast time-resolved transient absorption and two-dimensional NMR spectroscopies. Both ultrafast time-resolved transient absorption spectroscopy and time-resolved anisotropy decays demonstrate the proton transfer dynamics ...
DOI:
10.1021/ja304529v

8. Covalently Functionalized Single-Walled Carbon Nanotubes at Reverse Micellar Interface: A Strategy to Improve Lipase Activity

Author:
Ghosh Moumita; Maiti Subhabrata; Dutta Sounak; Das Dibyendu; Das Prasanta Kumar
Source:
Langmuir 2012 v.28 no.3 pp. 1715-1724
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; carbon nanotubes; carboxylic ester hydrolases; cetyltrimethylammonium bromide; chemical bonding; circular dichroism spectroscopy; enzyme activity; ethylene; fluorescein; fluorescence; hydrophilicity; hydrophobicity; isothiocyanates; micelles; moieties; nanohybrids; polyethylene glycol; transmission electron microscopy
Abstract:
... The present work reports covalent functionalization of single-walled carbon nanotubes (f-SWNTs) to introduce hydrophilicity to the otherwise amphiphobic nanotubes. The charge and spacer length of the functional moiety were varied by using quaternized ethylene diamine, 6-aminocaproate, quaternized (ethylenedioxy)bis(ethylamine), and a poly(ethylene glycol) (PEG) unit (f-SWNT-1 to f-SWNT-4, respecti ...
DOI:
10.1021/la2035906

9. Direct synthesis of hierarchical LTA zeolite via a low crystallization and growth rate technique in presence of cetyltrimethylammonium bromide

Author:
Fatin Hasan; Ranjeet Singh; Gang Li; Dongyuan Zhao; Paul A. Webley
Source:
Journal of colloid and interface science 2012 v.382 no.1 pp. 1-12
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorption; ambient temperature; cetyltrimethylammonium bromide; colloids; crystallization; ethylene; gels; micelles; nanocrystallites; nitrogen; nuclear magnetic resonance spectroscopy; pH; porosity; scanning electron microscopy; surfactants; transmission electron microscopy; zeolites; zeta potential
Abstract:
... Slow crystallization and growth rate at room temperature in the presence of surfactant micelles is a new strategy used to synthesize hierarchical Na–A zeolites. The observed structure of the hierarchical materials was consistent with a two stage growth mechanism. During the early stage of the gel evolution, miniature zeolite gel particles were formed and assembled around surfactant (cetyltrimethyl ...
DOI:
10.1016/j.jcis.2012.05.027

10. Effects of Interaction of Ionic and Nonionic Surfactants on Self-Assembly of PEO–PPO–PEO Triblock Copolymer in Aqueous Solution

Author:
Nambam J. S.; Philip John
Source:
Journal of physical chemistry 2012 v.116 no.5 pp. 1499-1507
ISSN:
1520-5207
Subject:
aqueous solutions; autocorrelation; cetyltrimethylammonium bromide; composite polymers; micelles; microstructure; modulus of elasticity; nanocarriers; nonionic surfactants; sodium dodecyl sulfate; temperature; viscoelasticity; zeta potential
Abstract:
... We study the effects of interaction of surfactants on the self-assembly of a triblock copolymer in aqueous solution by measuring percolation transition temperature (Tₚ), micellar size, zeta potential, and rheological properties. We use PEO–PPO–PEO triblock copolymer (Pluronics-F108) with anionic sodium dodecyl sulfate (SDS), cationic cetyltrimethylammonium bromide (CTAB), and nonionic nonylphenole ...
DOI:
10.1021/jp208902a

11. Enzyme immobilization on epoxy supports in reverse micellar media: Prevention of enzyme denaturation

Author:
Lahari Thudi; Lakshmi S. Jasti; Yalangi Swarnalatha; Nitin W. Fadnavis; Khudbudin Mulani; Sarika Deokar; Surendra Ponrathnam
Source:
Journal of molecular catalysis 2012 v.74 no.1-2 pp. 54-62
ISSN:
1381-1177
Subject:
Gluconobacter cerinus; NADP (coenzyme); Saccharomyces cerevisiae; adsorption; alcohol dehydrogenase; ambient temperature; buffers; calcium chloride; catalytic activity; cetyltrimethylammonium bromide; chymotrypsin; citrates; composite polymers; crosslinking; denaturation; epoxides; ethylene glycol; glucose; immobilized enzymes; iso-octanes; micelles; pH; sodium; surfactants; yeasts
Abstract:
... Immobilization of enzymes such as α-chymotrypsin (EC 3.4.21.1), yeast alcohol dehydrogenase (YADH) from Saccharomyces cerevisiae (EC 1.1.1.1) and glucose dehydrogenase (GDH) from Gluconobacter cerinus (EC 1.1.1.119) has been carried out. Copolymers of allyl glycidyl ether (AGE) crosslinked with 25% ethylene glycol dimethacrylate (EGDM) (25mg, dry wt) were contacted with the enzymes solubilized in ...
DOI:
10.1016/j.molcatb.2011.08.014

12. Fabrication and Characterization of Dendrimer-Functionalized Mesoporous Hydroxyapatite

Author:
Pramanik Nabakumar; Imae Toyoko
Source:
Langmuir 2012 v.28 no.39 pp. 14018-14027
ISSN:
1520-5827
Subject:
biocomposites; bones; cetyltrimethylammonium bromide; coatings; dendrimers; hydroxyapatite; micelles; pH; porosity; porous media; surface area; surfactants; tissue engineering
Abstract:
... A successful synthesis of mesostructured hydroxyapatite (HAp) using cetyltrimethylammonium bromide and poly(amido amine) dendrimer porogens has been reported. A comparative study of physicochemical properties has also been performed. The formation of a single-phase hydroxyapatite crystal in synthesized HAp particles with an aspect ratio of 2.3 was revealed. The formation of the mesostructural natu ...
DOI:
10.1021/la302066e

13. Fluorescence study of drug–carrier interactions in CTAB/PBS buffer model systems

Author:
Anne Techen; Carsten Hille; Carsten Dosche; Michael U. Kumke
Source:
Journal of colloid and interface science 2012 v.377 no.1 pp. 251-261
ISSN:
0021-9797
Subject:
cationic surfactants; cetyltrimethylammonium bromide; dyes; electrolytes; energy transfer; fluorescence; hydrodynamics; micelles; models; spectroscopy
Abstract:
... The well-known cationic surfactant hexadecyltrimethylammonium bromide (CTAB) was used as a model carrier to study drug–carrier interactions with fluorescence probes (5-hexadecanoylaminofluorescein (HAF) and 2,10-bis-(3-aminopropyloxy)dibenzo[a,j]perylene-8,16-dione (NIR 628) by applying ensemble as well as single molecule fluorescence techniques. The impact of the probes on the micelle parameters ...
DOI:
10.1016/j.jcis.2012.03.063

14. GNP confinement at the interface of cationic reverse micelles: influence in improving the lipase activity

Author:
Moumita Ghosh; Subhabrata Maiti; Sayanti Brahmachari; Prasanta Kumar Das
Source:
RSC advances 2012 v.2 no.24 pp. 9042-9051
ISSN:
2046-2069
Subject:
Chromobacterium viscosum; cetyltrimethylammonium bromide; circular dichroism spectroscopy; emulsions; enzyme activity; gold; hydrophobicity; ligands; micelles; nanogold; oils; solubilization; spectral analysis; surfactants; thiols; triacylglycerol lipase
Abstract:
... The present work reports thiol-assisted confinement of gold nanoparticles (GNPs) at the interface of reverse micelles with the aim to enhance the interfacial area and thereby the efficiency of surface-active Chromobacterium viscosum lipase. The strong gold capping ability of optimally hydrophobic thiols (1-dodecanethiol and 1,6-hexanedithiol) was aptly utilized to pull GNPs (∼3–5 nm) from the wate ...
DOI:
10.1039/c2ra21237d

15. In Situ Time-Resolved SAXS Study of the Formation of Mesostructured Organically Modified Silica through Modeling of Micelles Evolution during Surfactant-Templated Self-Assembly

Author:
Michaux Florentin; Baccile Niki; Impéror-Clerc Marianne; Malfatti Luca; Folliet Nicolas; Gervais Christel; Manet Sabine; Meneau Florian; Pedersen Jan Skov; Babonneau Florence
Source:
Langmuir 2012 v.28 no.50 pp. 17477-17493
ISSN:
1520-5827
Subject:
cetyltrimethylammonium bromide; mathematical models; micelles; phase transition; silica; silicates; surfactants
Abstract:
... The mechanisms of formation of organically modified (phenyl, vinyl, and methyl) silica materials with cubic Pm3̅n and hexagonal p6m periodic mesostructures obtained in one step in the presence of the cetyltrimethylammonium bromide (CTA⁺B) surfactant are reported in this study. Understanding the way these complex materials form is difficult but undoubtedly necessary for controlling the material str ...
DOI:
10.1021/la3038318

16. Interaction between Nonionic Polymer Hydroxypropyl Methyl Cellulose (HPMC) and Cationic Gemini/Conventional Surfactants

Author:
Sardar Najam; Kamil Mohammad; Kabir-ud-Din
Source:
Industrial & Engineering Chemistry Research 2012 v.51 no.3 pp. 1227-1235
ISSN:
1520-5045
Subject:
cetyltrimethylammonium bromide; crosslinking; engineering; fluorescence; hexane; methylcellulose; micelles; pentane; polymers; surfactants; viscometry; viscosity
Abstract:
... The purpose of this study was to investigate the interaction between a nonionic polymer, (hydroxypropyl)methyl cellulose (HPMC), and cationic gemini surfactants, bis(hexadecyldimethylammonium)hexane dibromide (16-6-16), bis(hexadecyldimethylammonium)pentane dibromide (16-5-16), and their corresponding monomeric counterpart cetyltrimethylammonium bromide (CTAB), by using electrical conductometry, f ...
DOI:
10.1021/ie2010725

17. Interactions between surfactants and silver nanoparticles of varying charge

Author:
J. Hedberg; M. Lundin; T. Lowe; E. Blomberg; S. Wold; I. Odnevall Wallinder
Source:
Journal of colloid and interface science 2012 v.369 no.1 pp. 193-201
ISSN:
0021-9797
Subject:
Raman spectroscopy; adsorption; cetyltrimethylammonium bromide; environmental assessment; hydrophobic bonding; laundry; light scattering; micelles; nanosilver; pH; particle size; quartz; risk assessment; sodium dodecylbenzenesulfonate; surfactants; washing; zeta potential
Abstract:
... The interaction between silver nanoparticles (Ag NPs) of different surface charge and surfactants relevant to the laundry cycle has been investigated to understand changes in speciation, both in and during transport from the washing machine. Ag NPs were synthesized to exhibit either a positive or a negative surface charge in solution conditions relevant for the laundry cycle (pH 10 and pH 7). Thes ...
DOI:
10.1016/j.jcis.2011.12.004

18. Mechanism of Oil Detachment from a Silica Surface in Aqueous Surfactant Solutions: Molecular Dynamics Simulations

Author:
Liu Qian; Yuan Shiling; Yan Hui; Zhao Xian
Source:
Journal of physical chemistry 2012 v.116 no.9 pp. 2867-2875
ISSN:
1520-5207
Subject:
adsorption; alkanes; cetyltrimethylammonium bromide; chemical elements; electrostatic interactions; energy; gels; hydrogen bonding; hydrophilicity; hydrophobicity; micelles; models; molecular dynamics; oil-water interface; oils; silica; solubilization; surfactants
Abstract:
... The mechanism of oil detachment from solid surfaces in aqueous surfactant solutions is studied by molecular dynamics simulations. At the initial simulation, the hydrophilic silica surface changes into a hydrophobic one due to the adsorption of the alkane molecules. Two-dimensional ordered arrangement of alkane molecules on the first layer is the key to the oil detachment from the silica surface. U ...
DOI:
10.1021/jp2118482

19. Micelle-catalyzed reaction between ninhydrin and nickel dipeptide complex [Ni(II)–Gly-Tyr]⁺

Author:
Mohd. Akram; Dileep Kumar; Kabir-ud-Din
Source:
Colloids and surfaces 2012 v.94 no. pp. 220-225
ISSN:
0927-7765
Subject:
activation energy; catalytic activity; cetyltrimethylammonium bromide; colloids; enthalpy; entropy; micelles; models; nickel; pH; surfactants
Abstract:
... The interaction of nickel dipeptide complex [Ni(II)–Gly-Tyr]⁺ with ninhydrin has been investigated in the absence and presence of cationic cetyltrimethylammonium bromide (CTAB) and gemini (16-s-16, s=4, 5, 6) surfactants spectrophotometrically at 80°C and pH 5.0. The product formed was the same and the reaction followed first- and fractional-order kinetics with respect to [Ni(II)–Gly-Tyr]⁺ and [ni ...
DOI:
10.1016/j.colsurfb.2012.01.041

20. Multiresidue determination of pesticides from aquatic media using polyaniline nanowires network as highly efficient sorbent for microextraction in packed syringe

Author:
Habib Bagheri; Noshin Alipour; Zahra Ayazi
Source:
Analytica chimica acta 2012 v.740 no. pp. 43-49
ISSN:
0003-2670
Subject:
cetyltrimethylammonium bromide; desorption; detection limit; gas chromatography-mass spectrometry; micelles; microextraction; monitoring; multiresidue analysis; nanowires; pH; pesticides; polymers; river water; scanning electron microscopy; solvents; triazines
Abstract:
... A simple, rapid and sensitive method based on microextraction in packed syringe (MEPS), in combination with gas chromatography–mass spectrometry (GC–MS) was developed. Polyaniline (PANI) nanowires network was synthesized and used as sorbent of MEPS for the multiresidue determination of selected analytes from triazine, organochlrorine and organophosphorous pesticides in aqueous samples. The PANI na ...
DOI:
10.1016/j.aca.2012.06.026

21. Peptide-Based Gemini Amphiphiles: Phase Behavior and Rheology of Wormlike Micelles

Author:
Shrestha Rekha Goswami; Nomura Kazuyuki; Yamamoto Masashi; Yamawaki Yukio; Tamura Yoshinaga; Sakai Kenichi; Sakamoto Kazutami; Sakai Hideki; Abe Masahiko
Source:
Langmuir 2012 v.28 no.44 pp. 15472-15481
ISSN:
1520-5827
Subject:
aqueous solutions; bromides; cetyltrimethylammonium bromide; glutamic acid; hydrophobicity; liquid crystals; lysine; micelles; models; phase transition; rheology; solvents; stress relaxation; synergism; temperature; viscoelasticity; viscosity
Abstract:
... Aqueous binary phase behavior of a peptide-based gemini amphiphile with glutamic acid and lysine as spacer group, acylglutamyllysilacylglutamate (m-GLG-m where m = 12, 14, and 16), has been reported over a wide range of concentration and temperature. Lauroylglutamyllysillauroylglutamate, 12-GLG-12, self-assembles into spherical micelles above critical micelle concentration (CMC). The micellar regi ...
DOI:
10.1021/la3022358

22. Photophysics of DNA staining dye Propidium Iodide encapsulated in bio-mimetic micelle and genomic fish sperm DNA

Author:
Anuva Samanta; Bijan Kumar Paul; Nikhil Guchhait
Source:
Journal of photochemistry and photobiology 2012 v.109 no. pp. 58-67
ISSN:
1011-1344
Subject:
DNA; anionic surfactants; cationic surfactants; cetyltrimethylammonium bromide; fish; fluorescence; hydrogen bonding; micelles; octoxynol; photobiology; photochemistry; propidium; sodium dodecyl sulfate; solvents; spectroscopy; spermatozoa; urea
Abstract:
... Photophysical processes in Propidium Iodide (PI), the well known DNA staining dye, have been exploited in homogeneous as well as heterogeneous medium by steady state and time resolved spectroscopy. The DNA staining dye PI exhibits intermolecular proton transfer reaction in aqueous and hydrogen-bonding acceptor solvents due to the formation of quinonoid structure which is acidic in nature. Time res ...
DOI:
10.1016/j.jphotobiol.2012.02.001

23. Physicochemical characterization of cationic gemini surfactants and their effect on reaction kinetics in ethylene glycol–water medium

Author:
Deepti Tikariha; Namrata Singh; Manmohan L. Satnami; Kallol K. Ghosh; Nadia Barbero; Pierluigi Quagliotto
Source:
Colloids and surfaces 2012 v.411 no. pp. 1-11
ISSN:
0927-7757
Subject:
Gibbs free energy; acetates; cetyltrimethylammonium bromide; colloids; ethylene glycol; heat production; hydrolysis; ionization; micelles; reaction kinetics; surface tension; surfactants; temperature
Abstract:
... Micellar and surface properties of two cationic gemini surfactants viz. alkanediyl-α,ω-bis(hydroxyethylmethylhexadecylammonium bromide) (C₁₆-s-C₁₆, MEA 2Br⁻, where s=4, 6) in aqueous and ethylene glycol–water medium (0–20%, v/v) have been investigated by conductivity and surface tension measurements. The values of critical micellar concentration (CMC) and degree of micellar ionization (α) increase ...
DOI:
10.1016/j.colsurfa.2012.06.032

24. Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Author:
Liu Jin-Yu; Wang Jin-Gui; Li Na; Zhao Hui; Zhou Hui-Jing; Sun Ping-Chuan; Chen Tie-Hong
Source:
Langmuir 2012 v.28 no.23 pp. 8600-8607
ISSN:
1520-5827
Subject:
X-ray diffraction; adsorption; aluminum; cationic surfactants; cetyltrimethylammonium bromide; colloids; crystallization; cyclohexanones; dissociation; hot water treatment; methanol; micelles; nitrogen; polyacrylic acid; porous media; scanning electron microscopy; silica; sodium chloride; transmission electron microscopy; zeolites
Abstract:
... Mesoporous zeolite silicalite-1 and Al-ZSM-5 with intracrystalline mesopores were synthesized with polyelectrolyte–surfactant complex as the template. Complex colloids were first formed by self-assembly of the anionic polymer poly(acrylic acid) (PAA) and the cationic surfactant cetyltrimethylammonium bromide (CTAB) in basic solution. During the synthesis procedure, upon the addition of the silica ...
DOI:
10.1021/la300447n

25. Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide

Author:
Petr Praus; Richard Dvorský; Petra Horínková; Miroslav Pospíšil; Petr Kovář
Source:
Journal of colloid and interface science 2012 v.377 no.1 pp. 58-63
ISSN:
0021-9797
Subject:
cationic surfactants; cetyltrimethylammonium bromide; dispersions; hydrodynamics; light scattering; micelles; molecular models; nanoparticles; sublimation; transmission electron microscopy; zeta potential
Abstract:
... ZnS nanoparticles were precipitated in aqueous dispersions of cationic surfactant cetyltrimethylammonium bromide (CTAB). The sphere radii of ZnS nanoparticles calculated by using band-gap energies steeply decreased from 4.5nm to 2.2nm within CTAB concentrations of 0.4–1.5mmolL⁻¹. Above the concentration of 1.5mmolL⁻¹, the radii were stabilized at R=2.0nm and increased up to R=2.5nm after 24h. The ...
DOI:
10.1016/j.jcis.2012.03.073

26. Preparation of High Pore Volume Pseudoboehmite Doped with Transition Metal Ions through Direct Precipitation Method

Author:
Yang Fan; Wang Qiang; Yan Jinglong; Fang Jian; Zhao Jihua; Shen Weiguo
Source:
Industrial & Engineering Chemistry Research 2012 v.51 no.47 pp. 15386-15392
ISSN:
1520-5045
Subject:
X-ray diffraction; aluminum; aluminum oxide; cetyltrimethylammonium bromide; engineering; image analysis; metal ions; micelles; nickel; nitrates; octoxynol; pH; porous media; sodium; surface area; surfactants; transmission electron microscopes; transmission electron microscopy
Abstract:
... Mesoporous pseudoboehmite with novel pore properties was prepared via the direct precipitation method using aluminum nitrate nonahydrate as the inorganic alumina precursor and different surfactants containing bis (2-ethylhexyl) sulfosuccinate sodium salt (AOT), cetyltrimethylammonium bromide (CTAB), and tert-octylphenoxypolyethoxyethanol (Triton X-100) as the structure-directing agents. The as-syn ...
DOI:
10.1021/ie3017626

27. Preparation of Super-Stable Gold Nanorods via Encapsulation into Block Copolymer Micelles

Author:
Kim Dae Hwan; Wei Alexander; Won You-Yeon
Source:
ACS Applied Materials & Interfaces 2012 v.4 no.4 pp. 1872-1877
ISSN:
1944-8252
Subject:
cetyltrimethylammonium bromide; composite polymers; cytotoxicity; encapsulation; ethylene oxide; fever; image analysis; micelles; nanorods; neoplasms; polyethylene glycol; solvents
Abstract:
... Gold nanorods (GNRs) have the potential to be used as imaging and hyperthermia agents for cancer theranostics. Clinical applications of as-synthesized GNRs (i.e., cetyl trimethylammonium bromide (CTAB)-coated GNRs) are currently limited by their cytotoxicity and insufficient colloidal stability. With an aim to address these problems, we developed a self-assembly processing technique for encapsulat ...
DOI:
10.1021/am300198v

28. Processing of Surfactant Templated Nano-Structured Silica Films Using Compressed Carbon Dioxide as Interpreted from In Situ Fluorescence Spectroscopy

Author:
Ghosh Kaustav; Rankin Stephen E.; Lehmler Hans-Joachim; Knutson Barbara L.
Source:
Journal of physical chemistry 2012 v.116 no.38 pp. 11646-11655
ISSN:
1520-5207
Subject:
carbon dioxide; cetylpyridinium chloride; cetyltrimethylammonium bromide; energy transfer; fluorescence; fluorescence emission spectroscopy; micelles; naphthalene; physical chemistry; porous media; silica; solutes; surfactants
Abstract:
... The local environment and dynamics of compressed carbon dioxide (CO₂) penetration in surfactant templated silica film synthesis is interpreted from the in situ fluorescence emission spectra of pyrene (Py) and a modified pyrene probe. Pyrene emission in cetyltrimethylammonium bromide (CTAB) and cetylpyridinium bromide (CPB) templated silica films is monitored immediately after casting and during pr ...
DOI:
10.1021/jp305113b

29. Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions

Author:
Yusof Nor Saadah M.; Khan M. Niyaz
Source:
Journal of physical chemistry 2012 v.116 no.7 pp. 2065-2074
ISSN:
1520-5207
Subject:
bromine; cetyltrimethylammonium bromide; ions; micelles; physical chemistry; rheological properties; temperature
Abstract:
... The semiempirical kinetic method has been used to determine the ratio of cetyltrimethylammonium bromide, CTABr, micellar binding constants of counterions X (KX) and Br (KBᵣ), i.e., KX/KBᵣ (= RXᴮʳ) for X = dianionic 5-methyl- and 5-methoxysalicylate ions. The values of KX and KBᵣ have been derived from the kinetic parameters obtained in the presence of spherical/nonspherical and spherical micelles, ...
DOI:
10.1021/jp210467p

30. Realization of the Reversible Vesicle–Micelle Transition of Vitamin-Derived Bolaamphiphiles by Heat Change Monitoring

Author:
Sun Yu-Long; Wang Si-Si; Han Xue; Chen Zhong-Xiu
Source:
Journal of physical chemistry 2012 v.116 no.40 pp. 12372-12380
ISSN:
1520-5207
Subject:
calorimetry; cetyltrimethylammonium bromide; encapsulation; fluorescein; heat; light scattering; micelles; monitoring; octoxynol; physical chemistry; sodium dodecyl sulfate; surfactants; temperature; titration; transmission electron microscopy; zwitterions
Abstract:
... The real-time energetics involved in the structural change of a zwitterionic vitamin-derived bolaamphiphiles (DDO) vesicles, which were induced by conventional surfactants, such as hexadecyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and Triton X-100 (TX100), was characterized by isothermal titration calorimetry (ITC). Interactions of both CTAB and SDS with DDO were accompanied ...
DOI:
10.1021/jp3071184

31. Role of Photoionization on the Dynamics and Mechanism of Photoinduced Electron Transfer Reaction of Coumarin 307 in Micelles

Author:
Dhenadhayalan Namasivayam; Selvaraju Chellappan
Source:
Journal of physical chemistry 2012 v.116 no.16 pp. 4908-4920
ISSN:
1520-5207
Subject:
absorption; aromatic amines; cations; cetyltrimethylammonium bromide; coumarin; electron transfer; energy; fluorescence; fluorescence emission spectroscopy; micelles; solvents
Abstract:
... The dynamics and mechanism of the photoinduced electron transfer (PET) reaction between coumarin 307 (C307) and aromatic amines in micelles have been studied by using steady-state (S–S) and time-resolved (T-R) absorption and fluorescence spectroscopy. Based on the fluorescence quenching time scale, PET in micelles is grouped into two types: (i) ultrafast electron transfer (ET) due to the close con ...
DOI:
10.1021/jp301412c

32. Sensing Micelle Hydration by Proton-Transfer Dynamics of a 3-Hydroxychromone Dye: Role of the Surfactant Headgroup and Chain Length

Author:
Das Ranjan; Duportail Guy; Richert Ludovic; Klymchenko Andrey; Mély Yves
Source:
Langmuir 2012 v.28 no.18 pp. 7147-7159
ISSN:
1520-5827
Subject:
bromides; cetyltrimethylammonium bromide; electrostatic interactions; fluorescence; hydrogen bonding; hydrophobicity; micelles; moieties; polysorbates; screening; sodium; sodium dodecyl sulfate; sulfates; surfactants
Abstract:
... The dynamics of the excited-state intramolecular proton-transfer (ESIPT) reaction of 2-(2′-furyl)-3-hydroxychromone (FHC) was studied in micelles by time-resolved fluorescence. The proton-transfer dynamics of FHC was found to be sensitive to the hydration and charge of the micelles, demonstrated through a decrease of the ESIPT rate constant (kPT) in the sequence cationic → nonionic → anionic micel ...
DOI:
10.1021/la300103a

33. Shape and Size of Highly Concentrated Micelles in CTAB/NaSal Solutions by Small Angle Neutron Scattering (SANS)

Author:
Das Narayan Ch.; Cao Hu; Kaiser Helmut; Warren Garfield T.; Gladden Joseph R.; Sokol Paul E.
Source:
Langmuir 2012 v.28 no.33 pp. 11962-11968
ISSN:
1520-5827
Subject:
cetyltrimethylammonium bromide; micelles; models; neutrons; surfactants; temperature
Abstract:
... Highly concentrated micelles in CTAB/NaSal solutions with a fixed salt/surfactant ratio of 0.6 have been studied using Small Angle Neutron Scattering (SANS) as a function of temperature and concentration. A worm-like chain model analysis of the SANS data using a combination of a cylindrical form factors for the polydisperse micellar length, circular cross-sectional radius with Gaussian polydispers ...
DOI:
10.1021/la2022598

34. Silica–Surfactant–Polyelectrolyte Film Formation: Evolution in the Subphase

Author:
Yang Bin; Jaber Robben; Edler Karen J.
Source:
Langmuir 2012 v.28 no.22 pp. 8337-8347
ISSN:
1520-5827
Subject:
X-radiation; air; cetyltrimethylammonium bromide; hydrolysis; liquids; micelles; models; neutrons; polyethyleneimine; silica; silicates
Abstract:
... We have previously reported that robust mesostructured films will grow at the surface of alkaline solutions containing cetyltrimethylammonium bromide (CTAB), polyethylenimine (PEI), and silica precursors. Here we have used time-resolved small-angle X-ray scattering to investigate the structural evolution of the micellar solution from which the films form, at several different CTAB–PEI concentratio ...
DOI:
10.1021/la3014317

35. Sizing of Reverse Micelles in Microemulsions using NMR Measurements of Diffusion

Author:
Law Susan J.; Britton Melanie M.
Source:
Langmuir 2012 v.28 no.32 pp. 11699-11706
ISSN:
1520-5827
Subject:
cetyltrimethylammonium bromide; diffusivity; hydrodynamics; light scattering; magnetism; micelles; nuclear magnetic resonance spectroscopy; surfactants
Abstract:
... This paper reports the size of reverse micelles (RMs) in AOT/octane/H₂O and CTAB/hexanol/H₂O microemulsions using magnetic resonance (MR) pulsed field gradient (PFG) measurements of diffusion. Diffusion data were measured using the pulsed gradient stimulated echo (PGSTE) experiment for surfactant molecules residing in the RM interface. Inverse Laplace transformation of these data generated diffusi ...
DOI:
10.1021/la300796u

36. Spectroscopic Properties, Excitation, and Electron Transfer in an Anionic Water-Soluble Poly(fluorene-alt-phenylene)-perylenediimide Copolymer

Author:
Marques Ana T.; Burrows Hugh D.; Seixas de Melo J. Sérgio; Valente Artur J. M.; Justino Licínia L. G.; Scherf Ullrich; Fron Eduard; Rocha Susana; Hofkens Johan; Snedden Edward W.; Monkman Andrew P.
Source:
Journal of physical chemistry 2012 v.116 no.25 pp. 7548-7559
ISSN:
1520-5207
Subject:
cetyltrimethylammonium bromide; composite polymers; dioxane; electrolytes; electron transfer; energy transfer; fluorescence; image analysis; micelles; photoluminescence; photons; physical chemistry; spectral analysis; surfactants; ultraviolet-visible spectroscopy
Abstract:
... An anionic fluorene-phenylene poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl}-based copolymer containing on-chain perylenediimine (PDI) chromophoric units, PBS-PFP-PDI, was synthesized and its photophysical properties studied as aggregates and isolated chains in water and dioxane/water (1:1) solution. UV–vis and emission spectroscopy measurements, time-correlated single ph ...
DOI:
10.1021/jp3000703

37. Structural Transitions of CTAB Micelles in a Protic Ionic Liquid

Author:
López-Barrón Carlos R.; Wagner Norman J.
Source:
Langmuir 2012 v.28 no.35 pp. 12722-12730
ISSN:
1520-5827
Subject:
cetyltrimethylammonium bromide; electrostatic interactions; ionic liquids; light microscopy; micelles; neutrons; nitrates; phase transition; rheology; topology; viscosity
Abstract:
... Micellar solutions of hexadecyltrimethylammonium bromide (CTAB) in a protic ionic liquid, ethylammonium nitrate (EAN), are studied by shear rheology, polarizing optical microscopy (POM), conductivity measurements, and small angle neutron scattering (SANS). Three concentration regimes are examined: A dilute regime (with concentrations [CTAB] < 5 wt %) consisting of noninteracting spherical micelles ...
DOI:
10.1021/la302231w

38. Structural behaviour of mixed cationic surfactant micelles: A small-angle neutron scattering study

Author:
L. Magnus Bergström; Vasil M. Garamus
Source:
Journal of colloid and interface science 2012 v.381 no.1 pp. 89-99
ISSN:
0021-9797
Subject:
cationic surfactants; cetyltrimethylammonium bromide; micelles
Abstract:
... Self-assembly in mixtures of two single-chain cationic surfactants, with different tail lengths (CTAB and DTAB) as well as of a single-chain (DTAB) and a double-chain (DDAB) cationic surfactant, with identical tail lengths, have been investigated with small-angle neutron scattering (SANS) and rationalised in terms of bending elasticity properties. The growth behaviour of micelles with respect to s ...
DOI:
10.1016/j.jcis.2012.05.015

39. Surfactant (Bi)Layers on Gold Nanorods

Author:
Gómez-Graña Sergio; Hubert Fabien; Testard Fabienne; Guerrero-Martínez Andrés; Grillo Isabelle; Liz-Marzán Luis M.; Spalla Olivier
Source:
Langmuir 2012 v.28 no.2 pp. 1453-1459
ISSN:
1520-5827
Subject:
analytical methods; aqueous solutions; cetyltrimethylammonium bromide; gold; micelles; nanorods; surfactants; transmission electron microscopy
Abstract:
... Gold nanorods in aqueous solution are generally surrounded by surfactants or capping agents. This is crucial for anisotropic growth during synthesis and for their final stability in solution. When CTAB is used, a bilayer has been evidenced from analytical methods even though no direct morphological characterization of the precise thickness and compactness has been reported. The type of surfactant ...
DOI:
10.1021/la203451p

40. Understanding the Interaction between Valsartan and Detergents by NMR Techniques and Molecular Dynamics Simulation

Author:
Cao Chenyu; Mao Jiezhen; Li Fang; Yang Minghui; He Hongqing; Jiang Ling; Liu Maili
Source:
Journal of physical chemistry 2012 v.116 no.25 pp. 7470-7478
ISSN:
1520-5207
Subject:
Gibbs free energy; angiotensin II; antagonists; cell membranes; cetyltrimethylammonium bromide; detergents; drugs; electrostatic interactions; hydrophilicity; hydrophobic bonding; hydrophobicity; hypertension; micelles; molecular dynamics; nuclear magnetic resonance spectroscopy; polysorbates; protons; sodium dodecyl sulfate; spectral analysis
Abstract:
... Valsartan (VST) is one of the Angiotensin II receptor antagonists, which is widely used in clinical hypertension treatment. It is believed that VST incorporates into biological membranes before it binds to AT₁ receptor. Herein the interactions between VST and detergents, mimicking the membrane environment, were investigated by using nuclear magnetic resonance (NMR) techniques and molecular dynamic ...
DOI:
10.1021/jp304304v

41. Vapour–liquid equilibrium relationship between toluene and mixed surfactants

Author:
Senlin Tian; Yingjie Li; Hong Mo; Ping Ning
Source:
Environmental technology 2012 v.33 no.14 pp. 1561-1567
ISSN:
1479-487X
Subject:
cetyltrimethylammonium bromide; environmental technology; groundwater; headspace analysis; micelles; models; octoxynol; polluted soils; remediation; sodium; surfactants; temperature; toluene; volatile organic compounds
Abstract:
... Micellar partitioning of volatile organic compounds (VOCs) in surfactant solutions and its effects on vapour–liquid equilibrium is fundamental to the overall design and implementation of surfactant-enhanced remediation. Knowledge of the vapour–liquid equilibrium partitioning coefficients for VOCs, especially in contaminated soils and groundwater in which they exist, is required. Headspace experime ...
DOI:
10.1080/09593330.2011.635711