Results 141 to 150 of about 66,829 (187)

Fluorescence probes for critical micelle concentration determination

Langmuir, 1985
The utility of pyrene and pyrene-3-carboxaldehyde as fluorescence probes for determining the critical micelle concentration (cmc) of nonionic (Tergitol25-L-9, Tergitol15-5-40, Neodol91-8), anionic (sodium decyl sulfate), and cationic (cetyltrimethylammonium bromide) surfactanb was investigated. The probes were dissolved in trace amounts (
E D, Goddard, N J, Turro, P L, Kuo, K P, Ananthapadmanabhan   +3 more
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Surfactant Diffusion Near Critical Micelle Concentrations

Journal of Solution Chemistry, 2002
Taylor dispersion and differential refractometry are used to measure mutual diffusion coefficients (D) for binary aqueous solutions of octylglucopyranoside, dodecylsulfobetaine, and sodium dodecyl sulfate (nonionic, zwitterionic and ionic surfactants, respectively).
Alan Siderius, Stacey Kolisnek Kehl, Derek G. Leaist   +2 more
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Interfacial properties and critical micelle concentration of lysophospholipids

Biochemistry, 1989
The critical micelle concentration (cmc) of several lysophospholipids and of a lysophospholipid analogue was determined from surface tension measurements using the maximum bubble pressure method and/or 31P NMR. The use of the maximum bubble pressure method has now been extended to micromolar concentrations of surfactant, and the experimental parameters
R E, Stafford, T, Fanni, E A, Dennis
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Light Scattering from Hydrophobe-Uptake Spherical Micelles near the Critical Micelle Concentration

Langmuir, 2014
We have investigated aqueous micellar solutions of mixtures of a surfactant (dodecylpyridinium chloride) and a hydrophobe (1-dodecanol) near the critical micelle concentration (cmc), using simultaneous static and dynamic light scattering measurements.
Ken, Morishima, Takahiro, Sato
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The critical micelle concentration of tetraethylammonium perfluorooctylsulfonate in water

Journal of Colloid and Interface Science, 2006
The 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, Alfredo, González-Pérez, Julian, Costa, Juan M, Ruso, Gerardo, Prieto, Pablo C, Schulz, Félix, Sarmiento   +6 more
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Accurate Critical Micelle Concentrations from a Microscopic Surfactant Model

The Journal of Physical Chemistry B, 2011
A 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, Vladimir A, Baulin, Josep, Bonet Avalos, Allan D, Mackie   +3 more
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Determination of Critical Micelle Concentration by Hyper-Rayleigh Scattering

Journal of the American Chemical Society, 2003
The 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, Krishnan, Anu, Das, Puspendu K, Ramakrishnan, S   +3 more
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The critical micelle concentrations of lysophosphatidic acid and sphingosylphosphorylcholine

Chemistry and Physics of Lipids, 2004
The 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, Evan, Mintzer, Robert, Bittman   +2 more
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Determination of critical micelle concentration of aqueous lysolecithin solutions

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism, 1971
Abstract 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, 1975
A 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, Nagamune Nishikido, Hiromoto Uehara, Ryohei Matuura   +3 more
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