Molecular origin of thermal diffusion in benzene plus cyclohexane mixtures -: art. no. 055901
Molecular origin of thermal diffusion in benzene plus cyclohexane mixtures -: art. no. 055901
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DOI：
10.1103/physrevlett.87.055901
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发表时间：
2001-07-30
影响因子：
8.6
通讯作者：
Köhler, W
中科院分区：
文献类型：
--
作者：
Debuschewitz, C;Köhler, W
用全息光栅技术研究了苯+环己烷混合物热扩散中的同位素效应（Soret效应）。Soret系数可以被分解为附加贡献。一份捐款。同位素效应源于质量和转动惯量的差异，与成分无关。一个额外的“化学”贡献取决于浓度，甚至改变其符号在苯的摩尔分数X-benz接近0.7。质量效应与分子动力学计算一致：较重的组分迁移到冷侧。
The isotope effect in thermal diffusion (Soret effect) of benzene + cyclohexane mixtures has been investigated by a holographic grating technique. The Soret coefficient can be split into additive contributions. One contribution. the isotope effect, stems from the differences of both mass and moment of inertia, and is independent of composition. An additional "chemical" contribution depends on concentration and even changes its sign at a benzene mole fraction X-benz approximate to 0.7. The mass effect is in agreement with molecular dynamics calculations: the heavier component migrates to the cold side.