Bleibel J, Domínguez A, Oettel M, Dietrich S
Institut für Angewandte Physik, Auf der Morgenstelle 10, Eberhard Karls Universität, 72076 Tübingen, Germany.
Soft Matter. 2014 Jun 21;10(23):4091-109. doi: 10.1039/c3sm53070a.
We investigate the evolution of a system of colloidal particles, trapped at a fluid interface and interacting via capillary attraction, as a function of the range of capillary interactions and temperature. We address the collapse of an initially homogeneous particle distribution and of a radially symmetric (disk-shaped) distribution of finite size, both theoretically by using a perturbative approach inspired by cosmological models and numerically by means of Brownian dynamics (BD) and dynamical density functional theory (DDFT). The results are summarized in a "dynamical phase diagram", describing a smooth crossover from a collective (gravitational-like) collapse to local (spinodal-like) clustering. In this crossover region, the evolution exhibits a peculiar shock wave behavior at the outer rim of the contracting, disk-shaped distribution.
我们研究了被困在流体界面并通过毛细吸引力相互作用的胶体粒子系统的演化，它是毛细相互作用范围和温度的函数。我们通过受宇宙学模型启发的微扰方法从理论上研究了初始均匀粒子分布以及有限尺寸的径向对称（盘状）分布的坍缩，并通过布朗动力学（BD）和动态密度泛函理论（DDFT）进行了数值研究。结果总结在一个“动态相图”中，该相图描述了从集体（类引力）坍缩到局部（类旋节线）聚集的平滑转变。在这个转变区域，演化在收缩的盘状分布的外缘表现出奇特的冲击波行为。
