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采用电化学界面张力测量的方法研究了表面活性剂苄基十四烷基二甲基氯化铵(TDMBA)在Hg电极上的吸附行为.在低浓度范围(0～0.07mmol/L)内,TDMBA在Hg电极上的吸附为单层吸附;而在较高浓度范围(0.10～2.00mmol/L)内,能够形成多层吸附.TDMBA在Hg电极上形成单层吸附时与形成多层吸附时的界面张力随施加电位变化有明显的区别,其临界胶束浓度分别为0.04,0.90mmol/L.在-0.7V电位下,TDMBA分子在其饱和吸附单层上的界面超量的最大值为1.452×10-6mol/m2,并据此计算出TDMBA分子的横截面积(1.143×10-18m2)和分子直径(1.207nm).
The adsorption behavior of benzyltetradecyldimethylammonium chloride (TDMBA) on Hg electrode was investigated by electrochemical interfacial tension measurement.Under the low concentration range (0 ~ 0.07mmol / L) The adsorption of TDMBA on Hg electrode was monolayer adsorption, while in the higher concentration range (0.10-2.00mmol / L), TDMBA could form multi-layer adsorption.DTMBA formed single-layer adsorption on Hg electrode and multi-layer adsorption Of interfacial tension with potential changes have significant differences, the critical micelle concentration of 0.04,0.90mmol / L. At -0.7V potential, TDMBA molecules in the saturation adsorption monolayer of the interface over the maximum 1.452 × 10-6mol / m2, and calculate the TDMBA molecule cross-sectional area (1.143 × 10-18m2) and molecular diameter (1.207nm).