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https://hdl.handle.net/2440/68694
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Type: | Journal article |
Title: | Microstructure of Un-neutralized Hydrophobically Modified Alkali-Soluble Emulsion Latex in Different Surfactant Solutions |
Author: | Dai, S. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2005; 21(16):7136-7142 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2005 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Sheng Dai and Kam Chiu Tam |
Abstract: | At low pH conditions and in the presence of anionic, cationic, and nonionic surfactants, hydrophobically modified alkali-soluble emulsions (HASE) exhibit pronounced interaction that results in the solubilization of the latex. The interaction between HASE latex and surfactant was studied using various techniques, such as light transmittance, isothermal titration calorimetry, laser light scattering, and electrophoresis. For anionic surfactant, noncooperative hydrophobic binding dominates the interaction at concentrations lower than the critical aggregation concentration (CAC) (C < CAC). However, cooperative hydrophobic binding controls the formation of mixed micelles at high surfactant concentrations (C > or = CAC), where the cloudy solution becomes clear. For cross-linked HASE latex, anionic surfactant binds only noncooperatively to the latex and causes it to swell. For cationic surfactant, electrostatic interaction occurs at very low surfactant concentrations, resulting in phase separation. With further increase in surfactant concentration, noncooperative hydrophobic and cooperative hydrophobic interactions dominate the binding at low and high surfactant concentrations, respectively. For anionic and cationic surfactant systems, the CAC is lower than the critical micelle concentration (CMC) of surfactants in water. In addition, counterion condensation plays an important role during the binding interaction between HASE latex and ionic surfactants. In the case of nonionic surfactants, free surfactant micelles are formed in solution due to their relatively low CMC values, and HASE latexes are directly solubilized into the micellar core of nonionic surfactants. |
Rights: | Copyright © 2005 American Chemical Society |
DOI: | 10.1021/la050651e |
Published version: | http://dx.doi.org/10.1021/la050651e |
Appears in Collections: | Aurora harvest 5 Chemical Engineering publications |
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