论文标题
具有较大bidispersity的玻璃形成液体的流变响应
Rheological response of a glass-forming liquid having large bidispersity
论文作者
论文摘要
使用广泛的数值模拟，我们研究了模型玻璃形成二进制混合物的流动行为，其组成颗粒具有较大的尺寸比。在较大物种在空间上是主要物种的制度中，研究了对施加剪切的流变学反应。我们证明，随着密度的增加而出现的宏观刚性发生在较大物种经历玻璃过渡的状态下，而较小的物种继续高度扩散。我们分析了剪切施加的时间尺度与两种物种的静态弛豫动力学之间的相互作用，以对观察到的流变响应提供微观见解。最后，通过调整混合物的组成，我们说明了较小颗粒的系统插入通过降低系统粘度来影响流变。
Using extensive numerical simulations, we investigate the flow behaviour of a model glass-forming binary mixture whose constituent particles have a large size ratio. The rheological response to applied shear is studied in the regime where the larger species are spatially predominant. We demonstrate that the macroscopic rigidity that emerges with increasing density occurs in the regime where the larger species undergo a glass transition while the smaller species continue to be highly diffusive. We analyse the interplay between the timescale imposed by the shear and the quiescent relaxation dynamics of the two species to provide a microscopic insight into the observed rheological response. Finally, by tuning the composition of the mixture, we illustrate that the systematic insertion of the smaller particles affects the rheology by lowering of viscosity of the system.
