Self-diffusiophoresis of chemically active colloids
Self-diffusiophoresis of chemically active colloids
复制标题
DOI：
10.1140/epjst/e2016-60058-2
复制
发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
M. N. Popescu;W. Uspal;S. Dietrich
中科院分区：
文献类型：
--
作者：
M. N. Popescu;W. Uspal;S. Dietrich
化学活性胶体通过发生在其表面部分的催化反应，局部地改变其溶剂的化学组成。它们通过不同的机制将释放的化学自由能转化为机械功来实现运动，如电泳法。在这里，我们讨论自扩散渗透的理论方面，尽管它是最简单的运动机制之一，但它捕获了许多表征自扩散的一般特征，例如由表面活性引起的溶液中的不均匀而自产生和维持的流体动力流动。通过研究提供物理洞察力的简单例子，我们强调了可以从自我扩散渗透中出现的复杂现象学。
Chemically active colloids locally change the chemical composition of their solvent via catalytic reactions which occur on parts of their surface. They achieve motility by converting the released chemical free energy into mechanical work through various mechanisms, such as phoresis. Here we discuss the theoretical aspects of self-diffusiophoresis, which – despite being one of the simplest motility mechanisms – captures many of the general features characterizing self-phoresis, such as self-generated and maintained hydrodynamic flows “driven” by surface activity induced inhomogeneities in solution. By studying simple examples, which provide physical insight, we highlight the complex phenomenology which can emerge from self-diffusiophoresis.