限制对扩散电泳自推进器的影响
Confinement effects on diffusiophoretic self-propellers
摘要：
我们从理论上研究了空间限制对溶解颗粒的泳动运动的影响，所述溶解颗粒由其溶剂的化学反应产生的成分梯度驱动，所述成分梯度仅在颗粒表面的某些部分上是活性的。我们发现，限制壁的存在下，以类似的方式增加的成分梯度和粘性摩擦，这些竞争效应的总体结果是增加的粒子的泳动速度。对于只在化学反应的粒子和产物分子之间存在空间排斥的情况，速度的绝对值仍然相当小。
英文摘要：
We study theoretically the effects of spatial confinement on the phoretic motion of a dissolved particle driven by composition gradients generated by chemical reactions of its solvent, which are active only on certain parts of the particle surface. We show that the presence of confining walls increases in a similar way both the composition gradients and the viscous friction, and the overall result of these competing effects is an increase in the phoretic velocity of the particle. For the case of steric repulsion only between the particle and the product molecules of the chemical reactions, the absolute value of the velocity remains nonetheless rather small.
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