First-order phase transition in mixed monolayers of hexadecyltrimethylammonium bromide and tetradecane at the air-water interface

被引：39
|
作者：
McKenna, CE [1 ]
Knock, MM [1 ]
Bain, CD [1 ]
机构：
[1] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
来源：
LANGMUIR | 2000年 / 16卷 / 14期
关键词：
D O I：
10.1021/la000675f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Mixed monolayers of CTAB (hexadecyltrimethylammonium bromide) and tetradecane were formed at the air-water interface by addition of small amounts of tetradecane to the surface of a CTAB solution below the critical micelle concentration. Ellipsometry and sum-frequency spectroscopy were used to demonstrate that these mixed monolayers exhibit a first-order phase transition from a conformationally disordered to a conformationally ordered state as the temperature is lowered. The phase transition occurs ca. 11 degrees C above the bulk melting point of tetradecane.
引用
收藏
页码：5853 / 5855
页数：3
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