Size dependence of the propulsion velocity for catalytic Janus-sphere swimmers
Size dependence of the propulsion velocity for catalytic Janus-sphere swimmers
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DOI：
10.1103/physreve.85.020401
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发表时间：
2012-02-15
影响因子：
2.4
通讯作者：
Golestanian, Ramin
中科院分区：
文献类型：
--
作者：
Ebbens, Stephen;Tu, Mei-Hsien;Golestanian, Ramin
实验研究了不对称催化化学反应的活性胶体的推进速度与粒径的关系。我们发现，在实验可及的范围内，速度作为尺寸的函数衰减，其速率与尺寸的逆依赖是相容的。考虑到胶体表面不对称催化活性的两步过程的燃料和废物分子浓度的扩散反应模型被证明可以预测胶体在大尺寸极限下的类似行为，并具有较小尺寸的饱和。
The propulsion velocity of active colloids that asymmetrically catalyze a chemical reaction is probed experimentally as a function of their sizes. It is found that over the experimentally accessible range, the velocity decays as a function of size, with a rate that is compatible with an inverse size dependence. A diffusion-reaction model for the concentrations of the fuel and waste molecules that takes into account a two-step process for the asymmetric catalytic activity on the surface of the colloid is shown to predict a similar behavior for colloids at the large size limit, with a saturation for smaller sizes.