Journal ArticleDOI
Structure and Composition of Mixed Surfactant Micelles of Sodium Dodecyl Sulfate and Hexaethylene Glycol Monododecyl Ether and of Hexadecyltrimethylammonium Bromide and Hexaethylene Glycol Monododecyl Ether
J. Penfold,E. J. Staples,L. Thompson,I. Tucker,J. Hines,Robert Thomas,and J. R. Lu,N. Warren +7 more
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TLDR
In this article, small-angle neutron scattering has been used to study the structure and composition of mixed ionic−nonionic surfactant micelles, and a comparison between two different mixed surfactants systems, sodium dodecyl sulfate (SDS) and hexaethylene glycol monodecyl ether (C12EO6), both in 0.1 M NaCl, has been made.Abstract:
Small-angle neutron scattering has been used to study the structure and composition of mixed ionic−nonionic surfactant micelles. A comparison between two different mixed surfactant systems, sodium dodecyl sulfate (SDS) and hexaethylene glycol monododecyl ether (C12EO6) and hexadecyltrimethylammonium bromide (C16TAB) and C12EO6, both in 0.1 M NaCl, has been made. In the latter system, ideal mixing is observed, and in the former, departure from ideality, broadly consistent with regular solution theory, RST, is observed. The deviations from the predictions of RST are attributed to subtle changes in the packing of the two surfactants in the mixed micelles. For the SDS/C12EO6 mixture, the micellar aggregation number is essentially constant with composition and concentration, whereas for the C16TAB/C12EO6 mixture there is a marked micellar growth with increasing concentration and mole fraction of C12EO6 in solution. The SANS results on structure and composition are compared with the results reported for other m...read more
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Journal ArticleDOI
Complex Fluids of Poly(oxyethylene) Monoalkyl Ether Nonionic Surfactants
Renhao Dong,Jingcheng Hao +1 more
Journal ArticleDOI
Micellization and Related Behavior of Binary and Ternary Surfactant Mixtures in Aqueous Medium: Cetyl Pyridinium Chloride (CPC), Cetyl Trimethyl Ammonium Bromide (CTAB), and Polyoxyethylene (10) Cetyl Ether (Brij-56) Derived System
TL;DR: The results have been analyzed in terms of the equations of Clint, Motomura, Rosen, Rubingh, Blankschtein et al. for justification of the experimental cmc, determination of micellar composition parameters, quantification of interaction among the mixed micelle components, and estimation of their activity coefficients.
Journal ArticleDOI
Surface Chemical and Micellar Properties of Binary and Ternary Surfactant Mixtures (Cetyl Pyridinium Chloride, Tween-40, and Brij-56) in an Aqueous Medium
TL;DR: In this article, mixed micelles formed by cetyl pyridinium chloride (CPC), Tween-40, and Brij-56 mixed in different proportions in an aqueous medium have been physicochemically studied in detail using tensiometric, conductometric, and fluorimetric techniques.
Journal ArticleDOI
Interaction, Stability, and Microenvironmental Properties of Mixed Micelles of Triton X100 and n-Alkyltrimethylammonium Bromides: Influence of Alkyl Chain Length
C. Carnero Ruiz and,J. Aguiar +1 more
TL;DR: In this paper, the critical micelle concentration (cmc) values of the corresponding mixtures in the whole range of composition were obtained by the pyrene 1:3 ratio method.
Journal ArticleDOI
Mixed Micellization of Dimeric (Gemini) Surfactants and Conventional Surfactants: II. CMC and Micelle Aggregation Numbers for Various Mixtures
TL;DR: The aqueous solutions of mixtures of various conventional surfactants and dimeric anionic and cationic surfactant systems investigated by electrical conductivity, spectrofluorometry, and time-resolved fluorescence quenching to determine the critical micelle concentrations and the micelle aggregation numbers show that the microviscosity of the systems containing dimeric Surfactants is larger than that of the reference systems.
References
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Theory of self-assembly of hydrocarbon amphiphiles into micelles and bilayers
TL;DR: In this paper, a simple theory is developed that accounts for many of the observed physical properties of micelles, both globular and rod-like, and of bilayer vesicles composed of ionic or zwitterionic amphiphiles.
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An analytic structure factor for macroion solutions
John B. Hayter,Jeffrey Penfold +1 more
TL;DR: In this article, the Ornstein-Zernike equation was used to obtain closed analytic forms for the direct correlation function c(r) and the structure factor S(Q).
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Micellization of mixed nonionic surface active agents
TL;DR: In this article, a theory for micellization in systems of mixed nonionic surfactants is developed, where assumptions of ideal mixing in the micellel and of a simple phase separation model enable the concentration of each monomeric species and hence the micellar composition to be calculated as a function of total concentration.
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Determination of micelle structure and charge by neutron small-angle scattering
John B. Hayter,Jeffrey Penfold +1 more
TL;DR: In this article, a general method of determining the structure and charge of globular ionic micelles, using neutron small-angle scattering, was presented, based in part on an analytic calculation of the interparticle correlations between monodisperse spherical mouselles.
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Predicting Micellar Solution Properties of Binary Surfactant Mixtures
A. Shiloach,Daniel Blankschtein +1 more
TL;DR: In this paper, the authors combined a molecular model of mixed micellization with a thermodynamic framework to predict a broad spectrum of solution properties of mixed surfactant systems, including the critical micelle concentration.