高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (S1): 204.

• 研究论文 • 上一篇    下一篇

溴化十六烷基三甲铵+正十六烷混合单分子层在空气-水界面上的二维相变化

雷群芳   

  1. 浙江大学化学系, 杭州 310027
  • 收稿日期:2001-08-07 出版日期:2001-12-31 发布日期:2001-12-31
  • 通讯作者: 雷群芳(1967年出生),女,博士,副教授.主要从事表面化学和化学热力学研究.e-mail:qunfanglei@css.zju.edu.cn E-mail:qunfanglei@css.zju.edu.cn

Two-Dimensional Phase Transition in Mixed Monolayer of Hexadecane and Hexadecyltrimethylammonium Bromide at Air/Water Interface

LEI Qun-Fang   

  1. Dtpartment of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:2001-08-07 Online:2001-12-31 Published:2001-12-31
  • Contact: qunfanglei@css.zju.edu.cn E-mail:qunfanglei@css.zju.edu.cn

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摘要：

用椭圆偏振光仪测定了不同温度时由溴化十六烷基三甲铵和正十六烷抅成的混合单分子层在空气-水界面上的椭圆率系数,证明该混合单分子层在髙于正十六烷正常熔点6℃的温度时有一从凝聚相到扩展液相的二维相变化.对椭圆率系数进行了理论预测,预测结果与实验值吻合良好.

关键词: 混合单分子层, 二维相变化, 气-液界面, 溴化十六烷基三甲铵, 椭圆偏振光

Abstract:

The ellipticity coefficients of mixed monolayers of hexadecane and CTAB (hexadecyltrimethyl-ammonium bromide) were measured using a Beaglehole ellipsometer at different temperatures. The experiment results showed that these mixed monolayers exhibit a two dimensional phase transition from condensed phase to expanded liquid phase as the temperature is increased. The phase transition occurs ca. 6℃ above the bulk melting point of hexadecane. The ellipticity coefficients were predicted by a simple physical model. The calculated results agree with the experimental data.

Key words: Mixed monolayer, Phase transition, Air/water interface, Hexadecyltrimethylammonium bromide, Ellipsometry

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