Tan Yongqiang, O'Haver John H
Department of Chemical Engineering, the University of Mississippi, University, MS 38677, USA.
J Colloid Interface Sci. 2004 Nov 15;279(2):289-95. doi: 10.1016/j.jcis.2004.06.101.
A modified BET adsorption isotherm equation was used to explain adsolubilization at the water-silica interface, producing a method for understanding adsolubilization that is independent of admicelle structure. The two constants k1 and k2 provide a measure of the surfactant-solute and solute-solute interactions, respectively. As predicted, k1 changed with various factors including surfactant structure, the presence and quantity of added lipophilic linker and hexane. On the other hand, k2 was fairly constant for all examined systems having the same solute. Commonly used partition coefficients can be easily related to the model and adsolubilization isotherms may be reproduced by the developed equation. Inferences about solute distribution at the interface and its location within the admicelle may be extracted from the results. The model is useful in explaining trends in adsolubilization and in predicting adsolubilization behavior for similar systems.
采用修正的BET吸附等温线方程来解释水-二氧化硅界面的增溶吸附作用，从而产生了一种独立于吸附胶束结构的理解增溶吸附作用的方法。两个常数k1和k2分别衡量表面活性剂-溶质和溶质-溶质之间的相互作用。正如所预测的，k1会随各种因素而变化，包括表面活性剂结构、添加的亲脂性连接剂和己烷的存在及数量。另一方面，对于所有具有相同溶质的被研究体系，k2相当恒定。常用的分配系数可以很容易地与该模型相关联，并且所开发的方程可以重现增溶吸附等温线。关于溶质在界面处的分布及其在吸附胶束内位置的推断可以从结果中得出。该模型有助于解释增溶吸附的趋势，并预测类似体系的增溶吸附行为。
