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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Application of Transient Evanescent Grating Techniques to the Study of Liquid/Liquid Interfaces
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Application of Transient Evanescent Grating Techniques to the Study of Liquid/Liquid Interfaces

机译：瞬态消逝光栅技术在液/液界面研究中的应用

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摘要

Transient grating experiments performed with evanescent fields resulting from total internal reflection at an interface between a polar absorbing solution and an apolar transparent solvent are described.The time evolution of the diffracted intensity was monitored from picosecond to millisecond time scales.The diffracted signal originates essentially from two density phase gratings:one in the absorbing phase induced by thermal expansion and one in the transparent solvent due to electrostriction.A few nanoseconds after excitation,the latter grating is replaced by a thermal grating due to thermal diffusion from the absorbing phase.The speed of sound and the acoustic attenuation measured near the interface are found to be essentially the same as in the bulk solutions.However,after addition of a surfactant in the polar phase,the speed of sound near the interface differs substantially from that in the bulk with the same surfactant concentration.This effect is interpreted in terms of adsorption at the liquid/liquid interface.Other phenomena,which are not observed in bulk experiments,such as acoustic echoes and a fast oscillation of the signal intensity,are also described.
机译：描述了瞬态光栅实验，该瞬态实验是由在极性吸收溶液和非极性透明溶剂之间的界面处的全内反射所导致的van逝场进行的。两个密度相光栅：一个处于热膨胀引起的吸收相，一个由于电致伸缩而处于透明溶剂中。在激发后几纳秒，由于吸收相的热扩散，后一个光栅被一个热光栅代替。界面处测得的声波衰减和声衰减与本体溶液基本相同。但是，在极性相中添加表面活性剂后，界面附近的声速与本体溶液中的声速基本不同。相同的表面活性剂浓度还描述了在大量实验中未观察到的其他现象，例如声回波和信号强度的快速振荡。

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