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
收藏
页码：218 / 222
页数：5
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