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arXiv 1504.01522cond-mat.soft
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近临界混合物中Janus粒子的自扩散电泳

Self-diffusiophoresis of Janus particles in near-critical mixtures

Alois Würger

摘要:

从理论上研究了近临界水二甲基吡啶混合物中激光加热Janus粒子的自推进,并将其速度vp和蠕动参数\b{eta}与其两半球的润湿性联系起来.对于非离子表面力,粒子将活性帽向前移动,除了在强驱动下,如果其中一个半球吸引水而另一个半球吸引二甲基吡啶,则会发生更复杂的行为。vp和\b{eta}都显示出对加热功率的非单调依赖性,甚至可以改变符号。包括漂移的抗衡离子由于组成梯度,我们发现,一个带电的帽子与卢剔啶亲和力驱动粒子的帽子前进,并与水的亲和力在相反的方向,与实验结果一致。

英文摘要:

We theoretically study the self-propulsion of a laser-heated Janus particle in a near critical waterlutidine mixture, and relate its velocity vp and squirmer parameter \b{eta} to the wetting properties of its two hemispheres. For non-ionic surface forces, the particle moves the active cap ahead, except at strong driving, where a more complex behavior occurs if one of the hemispheres attracts water and the other lutidine. Both vp and \b{eta} show non-monotonic dependencies on the heating power, and may even change sign. Including the drift of the counterions due to the composition gradient, we find that a charged cap with lutidine affinity drives the particle the cap ahead, and with water affinity in the opposite direction, in agreement with experimental findings.

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