arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1605.04880cond-mat.soft
收藏

化学动力Janus马达的微观模型

A microscopic model for chemically-powered Janus motors

Mu-Jie Huang, Jeremy Schofield, Raymond Kapral

摘要:

利用化学反应在溶液中推动自身的非常小的合成马达有望在新材料、科学和医学的开发中获得新的应用。这种潜在的应用前景,以及事实上,许多电机或有源元件的系统显示有趣的合作现象的根本利益,合成电机的研究已经成为一个活跃的研究领域。Janus马达,包括催化和非催化半球,在这些系统的实验和理论研究中占有重要地位。虽然Janus粒子系统的连续模型经常被用来描述电动机动力学,但能够解释分子间相互作用、多体浓度梯度、流体流动和热波动的微观模型提供了一种探索这些复杂的非平衡系统的动力学行为的方法,而不依赖于连续理论中经常进行的近似。从第一原理的微观模型的分析提供了一个基础,从该范围的有效性和局限性的近似理论的动力学可以进行评估。在本文中,Janus电机,电机与环境的相互作用只发生通过硬碰撞的扩散电泳推进的微观模型的构建,分析和理论预测相比。单电机和多电机系统的微观仿真进行说明的结果。

英文摘要:

Very small synthetic motors that make use of chemical reactions to propel themselves in solution hold promise for new applications in the development of new materials, science and medicine. The prospect of such potential applications, along with the fact that systems with many motors or active elements display interesting cooperative phenomena of fundamental interest, has made the study of synthetic motors an active research area. Janus motors, comprising catalytic and noncatalytic hemispheres, figure prominently in experimental and theoretical studies of these systems. While continuum models of Janus particle systems are often used to describe motor dynamics, microscopic models that are able to account for intermolecular interactions, many-body concentration gradients, fluid flows and thermal fluctuations provide a way to explore the dynamical behavior of these complex out-of-equilibrium systems that does not rely on approximations that are often made in continuum theories. The analysis of microscopic models from first principles provides a foundation from which the range of validity and limitations of approximate theories of the dynamics may be assessed. In this paper, a microscopic model for the diffusiophoretic propulsion of Janus motors, where motor interactions with the environment occur only through hard collisions, is constructed, analyzed and compared to theoretical predictions. Microscopic simulations of both single-motor and many-motor systems are carried out to illustrate the results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑