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根据Triton X-100在硅胶/水和硅胶/环已烷界面以及TritonX-305在硅胶/水界面的吸附结果,提出了两种简单的吸附模型。在硅胶/环己烷界面上形成的是单分子吸附层,吸附质分子以乙氧基链躺在硅胶表面上而以碳氢链伸入环己烷的方式取向。在硅胶/水界面上形成的是双分子吸附层,第一层中的分子以乙氧基链躺在硅胶表面上而以碳氢链朝外;第二层中的分子取向相反,即以碳氢链朝向第一层分子形成的碳氢链层,而以乙氧基链伸进水中。对石英玻璃-水-环己烷的接触角(θ_水)的测定结果表明,θ_水随水相中表面活性剂浓度的增加先升后降,进一步支持了上述吸附模型。
According to the adsorption results of Triton X-100 on silica gel / water and silica gel / cyclohexane interface and TritonX-305 on silica gel / water interface, two simple adsorption models are proposed. Formed at the silica / cyclohexane interface is the monomolecular adsorbed layer, in which the adsorbate molecules are oriented in such a way that the ethoxylate chains lie on the surface of the silica gel and the hydrocarbon chains extend into the cyclohexane. In the silica / water interface is formed bimolecular adsorption layer, the first layer of the molecule lying on the surface of the silica chain with ethoxy chains and hydrocarbon chains facing out; the second layer of molecules in the opposite orientation, that carbon The hydrogen chain is oriented toward the hydrocarbon chain layer formed by the first layer of molecules and extends into the water with the ethoxylate chain. The measurement of the contact angle (θ_water) of quartz glass-water-cyclohexane showed that θ_water first increased and then decreased with the increase of the surfactant concentration in the aqueous phase, further supporting the above adsorption model.