论文标题
胶体物质中摩擦的吸引增强的出现
Attraction-enhanced emergence of friction in colloidal matter
论文作者
论文摘要
在微粒材料中，在微观水平上出现摩擦效应仍然是一个具有挑战性的问题，特别是由于颗粒间接触的瞬时性质而导致热波动的系统。在这里，我们将粒子水平的摩擦停滞与有吸引力的胶体模型系统中的局部协调联系起来。我们揭示了颗粒的定向动力学因摩擦相互作用的出现而随着配位数的增加而呈指数速度，而摩擦相互作用的强度可以简单地通过改变吸引力的强度来调节。使用简单的计算机模拟模型，我们发现了颗粒间相互作用如何控制粒子之间摩擦接触的形成。我们的结果建立了摩擦，协调和颗粒间相互作用之间的定量关系。这是使用颗粒摩擦来调整颗粒物质的机械性能的关键步骤。
How frictional effects emerge at the microscopic level in particulate materials remains a challenging question, particularly in systems subject to thermal fluctuations due to the transient nature of interparticle contacts. Here, we directly relate particle-level frictional arrest to local coordination in an attractive colloidal model system. We reveal that the orientational dynamics of particles slows down exponentially with increasing coordination number due to the emergence of frictional interactions, the strength of which can be tuned simply by varying the attraction strength. Using a simple computer simulation model, we uncover how the interparticle interactions govern the formation of frictional contacts between particles. Our results establish quantitative relations between friction, coordination and interparticle interactions. This is a key step towards using interparticle friction to tune the mechanical properties of particulate materials.
