烷基聚葡糖苷溶液的表面吸附平衡与动力学

Adsorption Equilibrium and Kinetics of Alkyl Polyglucoside on the Air/Water Interface

用吊片法和气泡最大压力法分别测定了烷基聚葡糖苷 (APG) C9.6 G1 .3水溶液的平衡和动态表面张力 ,研究了 APG水溶液表面的吸附平衡、动力学及其影响因素 .测得其 cmc(临界胶束浓度 )为 0 .0 3 2 g /L .吸附过程由初始的扩散控制转变到势垒控制 ,吸附势垒为 4～ 7k J/mol.温度升高 ,平衡和动态表面张力均减小 ,吸附量增加 ;加入无机盐 ,平衡和动态表面张力增大 ,吸附量亦增加 ;醇类的吸附使动态表面张力下降速率加快 ,表明

The air-solution equilibrium(γ e) and dynamic surface tensions were measured by Wilhelmy method and maximum bubble pressure method(MBPM), respectively, of alkyl polyglucoside(APG) aqueous solution C 9.6G 1.3. The adsorption equilibrium and kinetics of APG on the air-solution interface were studied. The CMC of APG was determined to be 0.032 g/L. The above results show that at the start, the adsorption process is controlled by a diffusion step; Then it changes to a barrier control mechanism with a adsorption barrier between 4 and 7 kJ/mol. The effects of temperature, inorganic salts and alcohols on the adsorption equilibrium and kinetics were also discussed.