Fernández L A, Martín-Mayor V, Verrocchio P
Departamento de Física Teórica I, Universidad Complutense, 28040 Madrid, Spain.
Phys Rev Lett. 2007 Feb 23;98(8):085702. doi: 10.1103/PhysRevLett.98.085702.
The phase diagram of soft spheres with size dispersion is studied by means of an optimized Monte Carlo algorithm which allows us to equilibrate below the kinetic glass transition for all size distributions. The system ubiquitously undergoes a first-order freezing transition. While for a small size dispersion the frozen phase has a crystalline structure, large density inhomogeneities appear in the highly disperse systems. Studying the interplay between the equilibrium phase diagram and the kinetic glass transition, we argue that the experimentally found terminal polydispersity of colloids is a purely kinetic phenomenon.
通过一种优化的蒙特卡罗算法研究了具有尺寸分散性的软球的相图，该算法使我们能够在所有尺寸分布下在动力学玻璃化转变温度以下达到平衡。该系统普遍经历一级冻结转变。对于小尺寸分散性，冻结相具有晶体结构，而在高度分散的系统中会出现大的密度不均匀性。通过研究平衡相图和动力学玻璃化转变之间的相互作用，我们认为实验发现的胶体的终态多分散性是一种纯粹的动力学现象。
