Effect of chain length on the structure of monolayers of alkyltrimethylammonium bromides (CnTABs) at the air-water interface

被引：66

作者：

Bell, GR ^{[1
]}

Manning-Benson, S ^{[1
]}

Bain, CD ^{[1
]}

机构：

[1] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 01期

关键词：

D O I：

10.1021/jp972647k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sum-frequency (SF) spectroscopy and ellipsometry have been used to study monolayers of the cationic surfactants C(n)TAB (CH3(CH2)(n-1)N+(CH3)(3)Br-)(n=12, 14, 16, and 18) at the air-water interface at a constant surface area of 44 Angstrom(2)/molecule. The SF spectra of all four surfactants are very similar and yield a mean chain tilt of 58 degrees near the methyl terminus. The ellipsometric data suggest that the density of the chain region in the monolayers is close to that of a liquid hydrocarbon, which is consistent with the chain tilt derived from the sum-frequency spectra. These results are in quantitative agreement with detailed structural profiles of C(12)TAB and C(16)TAB determined by Thomas and co-workers by neutron reflection.

引用

页码：218 / 222

页数：5

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