Azizi Itay, Rabin Yitzhak
Department of Physics, and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan 52900, Israel.
Entropy (Basel). 2020 May 19;22(5):570. doi: 10.3390/e22050570.
We use Langevin dynamics simulations to study dense 2d systems of particles with both size and energy polydispersity. We compare two types of bidisperse systems which differ in the correlation between particle size and interaction parameters: in one system big particles have high interaction parameters and small particles have low interaction parameters, while in the other system the situation is reversed. We study the different phases of the two systems and compare them to those of a system with size but not energy bidispersity. We show that, depending on the strength of interaction between big and small particles, cooling to low temperatures yields either homogeneous glasses or mosaic crystals. We find that systems with low mixing interaction, undergo partial freezing of one of the components at intermediate temperatures, and that while this phenomenon is energy-driven in both size and energy bidisperse systems, it is controlled by entropic effects in systems with size bidispersity only.
我们使用朗之万动力学模拟来研究具有尺寸和能量多分散性的二维密集粒子系统。我们比较了两种类型的双分散系统，它们在粒子尺寸与相互作用参数之间的相关性方面存在差异：在一个系统中，大粒子具有高相互作用参数，小粒子具有低相互作用参数，而在另一个系统中情况则相反。我们研究了这两个系统的不同相，并将它们与具有尺寸但不具有能量双分散性的系统的相进行比较。我们表明，根据大粒子和小粒子之间相互作用的强度，冷却到低温会产生均匀玻璃态或镶嵌晶体。我们发现，具有低混合相互作用的系统在中间温度下会使其中一个组分发生部分冻结，并且虽然这种现象在尺寸和能量双分散系统中都是由能量驱动的，但在仅具有尺寸双分散性的系统中它是由熵效应控制的。
