Thermophoretic depletion follows Boltzmann distribution
Thermophoretic depletion follows Boltzmann distribution
复制标题
DOI：
10.1103/physrevlett.96.168301
复制
发表时间：
2006-04-28
影响因子：
8.6
通讯作者：
Braun, D
中科院分区：
文献类型：
--
作者：
Duhr, S;Braun, D
热渗透，也被称为热扩散或索雷特效应，沿着温度梯度移动颗粒。对于液体中的颗粒，这种效应缺乏理论上的解释。我们给出了在中等温度梯度下的实验结果：(I)200 nm聚苯乙烯微球在水中的热渗透损耗服从浓度在两个数量级上的指数分布；(Ii)Soret系数与微球的表面积成线性关系。在实验的基础上，认为局部热力学平衡是描述热泳作用的一个很好的起点。
Thermophoresis, also termed thermal diffusion or the Soret effect, moves particles along temperature gradients. For particles in liquids, the effect lacks a theoretical explanation. We present experimental results at moderate thermal gradients: (i) Thermophoretic depletion of 200 nm polystyrene spheres in water follows an exponential distribution over 2 orders of magnitude in concentration; (ii) Soret coefficients scale linearly with the sphere's surface area. Based on the experiments, it is argued that local thermodynamic equilibrium is a good starting point to describe thermophoresis.