论文部分内容阅读
测定了25℃时硅胶自单组分水溶液及二元混合水溶液中吸附溴化十六烷基三甲铵(CTAB)、溴化十四烷基三甲铵(TTAB)和溴化十四烷基吡啶(TPB)三种阳离子表面活性剂的等温线。结果表明,(1)自单组分溶液和混合溶液中的吸附等温线均为两平台型;(2)混合体系中,各组分的分吸附量在低平衡浓度和高平衡浓度时比其单独存在时的小,而在中等浓度区域时却有增加;(3)混合体系中总吸附等温线分于组成此体系的,两组分单独存在时的等温线之间,且更靠近表面活性较高组分的等温线。说明混合体系中的吸附性质主要取决于表面活性高的组分。文中对所得的结果进行了解释。按照半胶团浓度(HMC)时每个吸附分子都是独立的吸附中心的假设计算了各体系的半胶团最小聚集数,其值在6～11范围。
The results showed that at 25 ℃, CTAB, TTAB and tetradecylpyridinium bromide were adsorbed on silica gel from single-component aqueous solution and binary mixed aqueous solution TPB) isotherm of three cationic surfactants. The results showed that the adsorption isotherms of (1) single-component solution and mixed solution were of two-platform type. (2) In the mixed system, the adsorption capacity of each component was lower than that of low-equilibrium concentration and high-equilibrium concentration (3) In mixed system, the total adsorption isotherm is divided between the isotherms that form the system and the two components exist separately, and are closer to the surface activity Isotherms of the higher components. It indicates that the adsorption property in the mixed system mainly depends on the components with high surface activity. The results obtained in this paper are explained. According to the hypothesis that each adsorbate molecule is an independent adsorption center at the half-micellar concentration (HMC), the minimum number of semi-micelles in each system is calculated and the value is in the range of 6-11.