Investigation of surfactant conformation and order at the liquid-liquid interface by total internal reflection sum-frequency vibrational spectroscopy

被引:194
作者
Conboy, JC [1 ]
Messmer, MC [1 ]
Richmond, GL [1 ]
机构
[1] UNIV OREGON,DEPT CHEM,EUGENE,OR 97403
关键词
D O I
10.1021/jp953616x
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
The conformational order of sodium dodecyl sulfate (SDS) adsorbed at the D2O-CCl4 interface has been examined by total internal reflection sum-frequency vibrational spectroscopy. A change in conformation of the alkyl chain with increased surface coverage at the liquid-liquid interface is observed. A series of aqueous surfactant concentrations have been examined in order to determine the effect of surface coverage on the conformation of the alkyl chains at the interface. Polarization studies indicate that, for the concentration range examined, the symmetry axis of the terminal methyl group on the alkyl chain is oriented primarily along the surface normal. Identification of spectral features in the C-H region of the infrared region is facilitated by examination of the sum-frequency spectrum from an analogous deuterated compound.
引用
收藏
页码:7617 / 7622
页数:6
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