Structure of Partially Fluorinated Surfactant Monolayers at the Air-Water Interface

被引：20
|
作者：
Jackson, A. J. [1 ]
Li, P. X. [1 ]
Dong, C. C. [1 ]
Thomas, R. K. [1 ]
Penfold, J. [2 ]
机构：
[1] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
[2] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England
来源：
LANGMUIR | 2009年 / 25卷 / 07期
关键词：
NEUTRON REFLECTION; AIR/WATER INTERFACE; HEXADECYLTRIMETHYLAMMONIUM BROMIDE; HYDROCARBON SURFACTANTS; TENSION; LAYERS; MIXTURES; FLUOROCARBON; NONIDEALITY; ADSORPTION;
D O I：
10.1021/la802928f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Partially fluorinated cationic surfactants of the form CnF2n+1CmH2mN(CH3)Br have been prepared, and their behavior at the air-water interface has been studied using surface tension measurements and neutron reflectometry. The degree of fluorination has been varied while keeping the overall chain lengths similar. The results are compared with those previously obtained for C16H33N(CH3)Br (C(16)TAB). The structural studies show a decrease in molecular orientation with increasing fluorination. The mean tilt away from the surface normal varies from 55 degrees for C16TAB to 25 degrees for C8F17C6H12N(CH3)Br. The interfacial layer roughness is observed to be lower than that expected for a pure fluorocarbon surfactant.
引用
收藏
页码：3957 / 3965
页数：9
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