The Influence of Chain Length and Electrolyte on the Adsorption Kinetics of Cationic Surfactants at the Silica-aqueous Solution Interface
作者： R. Atkin , V.S.J. Craig , E.J. Wanless , S. Biggs
DOI: 10.1016/S0021-9797(03)00631-3
关键词: Electrolyte 、 Pulmonary surfactant 、 Adsorption 、 Micelle 、 Inorganic chemistry 、 Chemistry 、 Gibbs isotherm 、 Chloride 、 Aqueous solution 、 Potassium bromide
摘要: The equilibrium and kinetic aspects of the adsorption alkyltrimethylammonium surfactants at silica-aqueous solution interface have been investigated using optical reflectometry. effect added electrolyte, length hydrocarbon chain, counter- co-ions has elucidated. Increasing surfactant chain results in isotherm being displaced to lower concentrations. kinetics indicate that above cmc micelles are adsorbing directly surface as increases hydrophobicity a greater influence on adsoption kinetics. While addition 10 mM KBr CTAB maximal excess, there is no corresponding increase for KCl CTAC system. This attributed decreased binding efficiency chloride ion relative bromide ion. Variations co-ion species (Li, Na, K) little rate excess up bulk electrolyte concentration mM. However, increased presence electrolyte. Slow secondary seen over range concentrations absence importantly LiCl; origin this slow structural barrier adsorption.
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