溶液表面吸附实验拓展  

Extension of surface adsorption experiment for butanol aqueous solution

作　　者：李田[1] 杨玲[1] 徐金荣[1] 吴忠云[1] 朱涛[1] 

机构地区：[1]北京大学化学基础实验教学中心,北京100871

出　　处：《实验技术与管理》2016年第4期43-45,共3页Experimental Technology and Management

基　　金：国家基础科学人才培养基金资助项目(J1030413)

摘　　要：对经典的物理化学实验"溶液表面吸附的测定"进行了拓展,将体系由单一的正丁醇溶液扩展成正丁醇、异丁醇和叔丁醇一系列同分异构体。分别测定了3种醇溶液在不同浓度下的表面张力,拟合实验数据进而计算得到了单分子的占有面积,并与chem3D软件的理论模拟进行了比较。结果表明,实验求得吸附量和单分子占有面积的同时,可以有效地区分分子纳米尺度的结构差异。实验有助于增强学生对微观的具象认识,并对表面吸附实验有更加深刻全面的理解。Determination of surface adsorption for n-butanol aqueous solution＇ is a classical experiment in physical chemistry laboratory. This paper expands the solution system from n-butanol to three isomers including n-butanol, i- butanol and t-butanol. Their surface tension at different concentrations is determined. The occupied area of each molecule is acquired and consistent with the theoretical modeling by chem3D Lrltrm The result demonstrates that the surface adsorption experiment can characterize the molecule structure size in nano-scale accurately, and this teaching design can help students understand the experiment more deeply.

关 键 词：表面吸附 最大泡压法 表面张力 同分异构体 单分子占有面积 

分 类 号：O633[理学—高分子化学] O647.333[理学—化学]