SMALL-ANGLE RAYLEIGH-SCATTERING FROM NONEQUILIBRIUM FLUCTUATIONS IN LIQUIDS AND LIQUID-MIXTURES

被引：87

作者：

LI, WB ^{[1
]}

SEGRE, PN ^{[1
]}

GAMMON, RW ^{[1
]}

SENGERS, JV ^{[1
]}

机构：

[1] UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND

来源：

PHYSICA A | 1994年 / 204卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0378-4371(94)90440-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have developed an improved experimental arrangement for measuring small-angle Rayleigh scattering in liquid systems subjected to a stationary temperature gradient. This improved arrangement has enabled us to measure nonequilibrium fluctuations with a simple helium-neon laser. We have used this technique to measure long-range nonequilibrium fluctuations in n-hexane and in several mixtures of n-hexane with toluene, thus complementing measurements for the equimolar mixture obtained previously. The experiments confirm that all diffusive nonequilibrium fluctuations vary with (del T)2/k4, where del T is the imposed temperature gradient and where k is the wave number of the fluctuations. A quantitative comparison of the strength of these nonequilibrium fluctuations with the theoretical predictions is also presented.

引用

页码：399 / 436

页数：38

共 99 条

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