| 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 |
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| 引用本文： | 雷群芳.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[J].高等学校化学学报,2001,22(Z1):204-207. |
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| 作者姓名： | 雷群芳 |
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| 作者单位： | 浙江大学化学系, 杭州 310027 |
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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.
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| 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 |
| 文章编号： | 0251-0790(2001)10Z-204-04 |
| 收稿时间： | 2001-08-07 |
| 修稿时间： | 2001年8月7日 |
Two-Dimensional Phase Transition in Mixed Monolayer of Hexadecane and Hexadecyltrimethylammonium Bromide at Air/Water Interface |
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| LEI Qun-Fang.Two-Dimensional Phase Transition in Mixed Monolayer of Hexadecane and Hexadecyltrimethylammonium Bromide at Air/Water Interface[J].Chemical Research In Chinese Universities,2001,22(Z1):204-207. |
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| Authors: | LEI Qun-Fang |
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| Institution: | Dtpartment of Chemistry, Zhejiang University, Hangzhou 310027, China |
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| 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. |
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| Keywords: | Mixed monolayer Phase transition Air/water interface Hexadecyltrimethylammonium bromide Ellipsometry |
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