Results 251 to 260 of about 28,738 (278)
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The critical micelle concentration of tetraethylammonium perfluorooctylsulfonate in water
Journal of Colloid and Interface Science, 2006The aggregation characteristics of tetraethylammonium perfluorooctylsulfonate in water were studied by several techniques: conductivity, pH, ion-selective electrodes, and surface tension. It was concluded that the aggregation process is gradual and starts with the formation of oligomers such as ion pairs that grow to give spherical micelles, which ...
José L, López-Fontán +6 more
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Accurate Critical Micelle Concentrations from a Microscopic Surfactant Model
The Journal of Physical Chemistry B, 2011A single chain mean field theory is used to quantitatively describe the micellization process of the nonionic polyethylene oxide alkyl ether, C(n)E(m) class of surfactants at 25 °C. An explicit but simple microscopic model with only three interaction parameters is shown to be able to reproduce with high accuracy the critical micelle concentrations of a
Asfaw, Gezae Daful +3 more
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Determination of Critical Micelle Concentration by Hyper-Rayleigh Scattering
Journal of the American Chemical Society, 2003The critical micelle concentration (CMC) of several surfactants that contain an NLO chromophore, either at the hydrocarbon tail, or at the hydrophilic headgroup, or even as a counterion, was determined by hyper-Rayleigh scattering (HRS). In all cases, the HRS signal exhibited a similar variation with surfactant concentration, wherein the CMC is ...
Ghosh, Suhrit +3 more
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The critical micelle concentrations of lysophosphatidic acid and sphingosylphosphorylcholine
Chemistry and Physics of Lipids, 2004The critical micelle concentrations (CMC) of lysophosphatidic acid (LPA) and sphingosylphosphorylcholine (SPC) were measured by isothermal titration calorimetry. The CMC of LPA decreases with salt concentration and acyl chain length. In water at 25 degrees C, the CMC values of 1-acyl-2-lyso-sn-glycero-3-phosphatidic acid are 1.850, 0.540, 0.082, and 0 ...
Zaiguo, Li +2 more
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Determination of critical micelle concentration of aqueous lysolecithin solutions
Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism, 1971Abstract The ultraviolet absorption band of o-cresol was found to shift significantly when lysolecithin micelles were present in the aqueous solution. Since this change in the spectrum is similar to the shift observed when the environment of o-cresol is changed from water to the less polar medium methanol, and since it disappears below a critical ...
E, Hamori, A M, Michaels
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An interrelationship between heat of micelle formation and critical micelle concentration
Journal of Colloid and Interface Science, 1975A discussion whether or not the contribution of water must be introduced into a thermodynamic equation of micellization was made on the basis of a phase separation model. As a result, an enthalpy change on micelle formation at very low CMC can be fairly approximated by the conventional expression, ΔHm = − nRT2(∂ ln CMC/∂T)p.
Yoshikiyo Moroi +3 more
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Electrostatic surface potential and critical micelle concentration relationship for ionic micelles
Langmuir, 1990La relation entre le potentiel electrostatique interfaciale et la concentration critique micellaire pour les systemes NaBr/bromure de dodecyltrimethylammonium NaCl/chlorure de dodecyltrimethylammonium; NaCl/dodecylsulfate de sodium; NaClO 4 /dodecylsulfate de sodium; NaClO 4 /decylsulfate de sodium est ...
Thomas W. Healy +3 more
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Large micelles in concentrated solutions. The second critical micellar concentration
The Journal of Physical Chemistry, 1984Resultats de mesures de la birefringence magnetique et de la viscosite dans des solutions micellaires aqueuses d'un agent de surface cationique (bromure de cetylpyridinium). Mise en evidence de 2 series de concentrations separees, a micelles de formes et dimensions differentes, en accord avec l'idee d'une «seconde concentration critique micellaire ...
G. Porte, Y. Poggi, J. Appell, G. Maret
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Critical micelle concentration: A transition point for micellar size distribution
Journal of Colloid and Interface Science, 1975Abstract The size distribution of aggregates in amphiphilar systems are computed on the basis of statistical thermodynamics. Numerical calculations have been carried out for alkyl glucosides and sodium alkyl sulfates. In these cases the computations show that the amphiphilar solution consists of single amphiphiles and only a narrow size range of ...
E. Ruckenstein, R. Nagarajan
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Determination of Critical Micelle Concentration by Electrochemical Means
Analytical Letters, 2006Overview of electrochemical methods for critical micelle concentration (cmc) determination is given. The principles and examples of cmc determination by conductometry, potentiometry, tensammetry, polarography, voltammetry, electrophoresis, and isotachophoresis are reviewed and discussed.
Karel Nesměrák, Irena Němcová
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