Excess Entropy Scaling in Active-Matter Systems
Excess Entropy Scaling in Active-Matter Systems
复制标题
活性物质系统中的过量熵缩放
DOI：
10.1021/acs.jpclett.2c01415
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Wang, Gerald J.
中科院分区：
文献类型：
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作者：
Ghaffarizadeh, S. Arman;Wang, Gerald J.
活性物质系统以离散粒子为特征，可以将储存的或周围的自由能转化为运动。为了实现工程潜力的活性物质，有一个强烈的需要预测和理论上的接地技术来描述这些系统中的传输。在这项工作中，我们进行分子动力学（MD）模拟的模型活性物质系统，其中我们改变的活性粒子的总分数（0.01 ≤ λ ≤ 0.5）以及活性粒子的活性程度。这些模拟揭示了一系列有趣的传输现象，包括活性增强扩散系数。通过调整现有的结果为二进制（非活性）流体，我们证明了存在的过剩熵标度关系在一个活跃的系统。我们的MD结果很好地支持了这种关系，并在活性物质中建立了运输（动力学）和结构（静态）之间的新联系，这是此类系统中其他运输现象的预测和可推广模型的一个有希望的步骤。
Active-matter systems feature discrete particles that can convert stored or ambient free energy into motion. To realize the engineering potential of active matter, there is a strong need for predictive and theoretically grounded techniques for describing transport in these systems. In this work, we perform molecular-dynamics (MD) simulations of a model active-matter system, in which we vary the total fraction of active particles (0.01 ≤ ϕ ≤ 0.5) as well as the degree of activity of the active particles. These simulations reveal a fascinating array of transport phenomena, including activity-enhanced diffusion coefficients. By adapting an existing result for binary (inactive) fluids, we demonstrate the existence of an excess entropy scaling relation in an active system. This relationship is well supported by our MD results and establishes a new connection between transport (dynamics) and structure (statics) in active matter, a promising step for predictive and generalizable models of other transport phenomena in such systems.