Universal isotope effect in thermal diffusion of mixtures containing cyclohexane and cyclohexane-d12.
Universal isotope effect in thermal diffusion of mixtures containing cyclohexane and cyclohexane-d12.
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含有环己烷和环己烷-d12 的混合物热扩散中的通用同位素效应。
DOI：
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发表时间：
2005
影响因子：
4.4
通讯作者：
W. Köhler
中科院分区：
文献类型：
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作者：
G. Wittko;W. Köhler
用瞬态全息光栅技术测量了丙酮、苯、苯-d1、1，3，5-苯-d3、苯-d5、苯-13 C6、苯-d 6、正己烷、甲苯、1，2，3，4-四氢萘、异丁基苯和1，6-二溴己烷在质子化和全氘代环己烷中的Soret系数S（T）。已经发现，S（T）可以是正的或负的，甚至可以作为浓度的函数改变其符号。同位素效应Δ S（T）=-0.99 × 10（-3）K（-1），这是环己烷同位素取代后S（T）的变化，既不依赖于浓度，也不依赖于混合伙伴的性质。仅在极性丙酮的情况下，Δ S（T）大约大30%，但仍然与浓度无关。根据实验结果，得出了Soret系数与分子性质相关的一些一般性结论。
The Soret coefficients S(T) of the liquids acetone, benzene, benzene-d1, 1,3,5-benzene-d3, benzene-d5, benzene-13C6, benzene-d6, n-hexane, toluene, 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and 1,6-dibromohexane have been measured in protonated and perdeuterated cyclohexane by a transient holographic grating technique. It has been found that S(T) can be either positive or negative and even change its sign as a function of concentration. The isotope effect DeltaS(T)=-0.99 x 10(-3) K(-1), which is the change of S(T) after isotopic substitution of cyclohexane, neither depends on concentration nor on the nature of the mixing partner. Only in the case of the polar acetone is DeltaS(T) approximately 30% larger but still concentration independent. Based on the experimental findings, some general conclusions about the dependence of the Soret coefficient on molecular properties are drawn.