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Type: Journal article
Title: Effect of Cosolvents on the Binding Interaction between Poly(ethylene oxide) and Sodium Dodecyl Sulfate
Author: Dai, S.
Tam, K.
Citation: Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, 2006; 110(42):20794-20800
Publisher: Amer Chemical Soc
Issue Date: 2006
ISSN: 1520-6106
Statement of
Sheng Dai and Kam Chiu Tam
Abstract: The micellization of sodium dodecyl sulfate (SDS) in different glycol-water solvent mixtures was studied using the isothermal titration calorimetric (ITC) technique. At the same time, microcalorimetric titrations were also carried out to monitor the binding interaction of SDS and poly(ethylene oxide) (PEO) in the presence of different cosolvents. The demicellization of SDS in mixtures of water and cosolvents is different from that in water due to the reduction in solvent polarity and charge interaction of surfactants. The critical micelle concentration (cmc) first decreases with the addition of a small amount of cosolvents and then increases at higher cosolvent concentrations. The thermodynamics of surfactant micellization can be analyzed using the solubility parameters of solvent mixtures. For the binding interaction between SDS and PEO in different solvent mixtures, the dehydration process at low SDS concentrations is replaced by the chain solubilization process with decreasing solvent polarity. With further reduction in the solvent polarity, the binding interaction between SDS and PEO becomes weak and no aggregates can be formed beyond a certain glycol concentration. The binding interaction between SDS and PEO in different solvent mixtures was analyzed and ascribed to the effects of PEO solubility and hydrophobicity of SDS.
Keywords: Sodium Dodecyl Sulfate; Polyethylene Glycols; Solvents; Colorimetry; Micelles; Hydrophobic and Hydrophilic Interactions
Rights: Copyright © 2006 American Chemical Society
RMID: 0020112532
DOI: 10.1021/jp061438
Appears in Collections:Chemical Engineering publications

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