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

Chem. J. Chinese Universities ›› 2001, Vol. 22 ›› Issue (S1): 204.

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

LEI Qun-Fang

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

Abstract

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

CLC Number:

O647.2

TrendMD:

LEI Qun-Fang. Two-Dimensional Phase Transition in Mixed Monolayer of Hexadecane and Hexadecyltrimethylammonium Bromide at Air/Water Interface[J]. Chem. J. Chinese Universities, 2001, 22(S1): 204.

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

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