Kim Jung Min, Fang Jun, Eberle Aaron P R, Castañeda-Priego Ramón, Wagner Norman J
Department of Chemical and Biomolecular Engineering, Center for Neutron Science, University of Delaware, Newark, Delaware 19716, USA.
Analytical and Systems Research, Arkema Inc., King of Prussia, Pennsylvania 19406, USA.
Phys Rev Lett. 2013 May 17;110(20):208302. doi: 10.1103/PhysRevLett.110.208302. Epub 2013 May 15.
The role of gravity in gelation of adhesive hard spheres is studied and a critical criterion developed for homogeneous gelation within the gas-liquid binodal. We hypothesize that gelation by Brownian diffusion competes with phase separation enhanced by gravitational settling. This competition is characterized by the gravitational Péclet number Pe(g), which is a function of particle size, volume fraction, and gravitational acceleration. Through a systematic variation of the parameters, we observe the critical Pe(g) of ∼ 0.01 can predict the stability of gels composed of adhesive hard spheres.
研究了重力在粘性硬球凝胶化过程中的作用，并制定了一个临界准则，用于气液双节线内的均匀凝胶化。我们假设布朗扩散引起的凝胶化与重力沉降增强的相分离相互竞争。这种竞争由重力佩克莱数Pe(g)表征，它是粒径、体积分数和重力加速度的函数。通过系统地改变参数，我们观察到临界Pe(g)约为0.01可以预测由粘性硬球组成的凝胶的稳定性。
