气-液界面上TTAB水溶液动态表面张力的研究  

Investigation on Dynamic Surface Tension of Aqueous TTAB Molecules at Air/Water Interface

作　　者：莫春生[1] 林倚姗[1] 

机构地区：[1]湛江师范学院化学科学与技术学院,广东湛江524048

出　　处：《湛江师范学院学报》2007年第3期67-70,共4页Journal of Zhanjiang Normal College

基　　金：广东省自然科学基金资助项目(04011432);湛江师范学院科学研究基金资助项目(Z0219)

摘　　要：滴体积法测定30℃时气-液界面上十四烷基三甲基溴化铵(TTAB)水溶液的动态表面张力.根据动态表面张力随浓度的变化规律研究TTAB分子的吸附动力学.发现在气-液两相界面上,TTAB分子的吸附机理与溶液浓度有关.在小于CMC的极低浓度时,TTAB水溶液的吸附为纯扩散控制机理.随浓度增大,吸附机理由纯扩散控制转变为受扩散-动力学控制.The dynamic surface tensions （DST） of tetradecyltrimethylammonium bromide （TTAB） solutions at various concentrations are measured by the drop volume method at 30℃. The adsorption kinetics of tetradecyltrimethylammonium bromide at air/water interface has been investigated via the analysis of dynamic surface tension data. It is found that the adsorption mechanism is dependent on concentration of surfactant. The surface adsorption of TTAB molecules obeys the pure diffusion controlled mechanism at a very low TTAB concentration. Increasing concentration of TTAB leads to a change of adsorption mechanism from the pure diffusion controlled to diffusion-kinetic-controlled.

关 键 词：动态表面张力 十四烷基三甲基溴化铵 吸附动力学 

分 类 号：O647[理学—物理化学]