论文标题
相互作用强度和各向异性对球形胶体的分散形状的影响
Effect of the interaction strength and anisotropy on the diffusio-phoresis of spherical colloids
论文作者
论文摘要
温度，浓度或静电电势的梯度不能在散装流体上施加力。但是，它们可以在围绕（Nano）胶体溶质的微观边界层的流体上施加力，从而导致所谓的Phoretic流动。在这里，我们提出了围绕固定在浓度梯度的球形胶体周围的流动流量的模拟研究。我们表明，所得的流速度在非单调的胶体相互作用的强度上取决于。这种非单调依赖性的原因是，溶质颗粒被有效地捕获在胶体周围的壳中，无法促进分散性斑点。我们还观察到该流量敏感地取决于溶质 - 胶体相互作用的各向异性。
Gradients in temperature, concentration or electrostatic potential cannot exert forces on a bulk fluid; they can, however, exert forces on a fluid in a microscopic boundary layer surrounding a (nano)colloidal solute, resulting in so-called phoretic flow. Here we present a simulation study of phoretic flow around a spherical colloid held fixed in a concentration gradient. We show that the resulting flow velocity depends non-monotonically on the strength of the colloid-fluid interaction. The reason for this non-monotonic dependence is that solute particles are effectively trapped in a shell around the colloid and cannot contribute to diffusio-phoresis. We also observe that the flow depends sensitively on the anisotropy of solute-colloid interaction.
