Separation of nanoparticles via surfing on chemical wavefronts.
Separation of nanoparticles via surfing on chemical wavefronts.
复制标题
纳米粒子在化学波阵面上的分离。
DOI：
10.1039/d0nr01211d
复制
发表时间：
2020-04
期刊：
影响因子：
6.7
通讯作者：
Ru-Fei Cui;Qing-Hu Chen;Jiang-Xing Chen
中科院分区：
文献类型：
--
作者：
Ru-Fei Cui;Qing-Hu Chen;Jiang-Xing Chen
微纳米级胶体的分离是大多数生物微量分析技术的必要步骤，也是微化学处理的常见做法。化学波在远离平衡状态的生化系统中经常遇到。在此，我们提出了一种利用悬浮胶体在衬底化学波前的冲浪来分离悬浮胶体的方法。对底物具有催化活性的胶体被激活以显示自我推进，从而对行波前表现出趋化反应，这导致它们通过自扩散电泳从多组分复杂混合物中自发分离。通过粒子模拟分析了该过程的动力学特性。此外，还发现可以根据粒度进行分离。讨论了化学和物理分离过程的机理，并给出了反应速率常数和粒度对分离过程的依赖关系。研究结果可为进一步的实验和理论研究在复杂的活动环境中分离提供参考。
The separation of micro and nanoscale colloids is a necessary step in most biological microassay techniques, and is a common practice in microchemical processing. Chemical waves are frequently encountered in biochemical systems driven far from equilibrium. Here, we put forward a strategy for separating small suspending colloids by means of their surfing on substrate chemical wavefronts. The colloids with catalytic activities sensitive to the substrates are activated to show self-propulsion and consequently exhibit a chemotactic response to the traveling wavefronts, which results in their spontaneous separation from the multicomponent complex mixture via self-diffusiophoresis. The dynamics of the process is analyzed through a particle-based simulation. In addition, it is found that separation can be carried out according to particle size. The mechanisms underpinning the chemical and physical separation processes are discussed, and the dependencies on the reaction rate constant and particle size are presented. The results may prove relevant for further experimental and theoretical studies of separation in complex active environments.