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Kim, Jung Min; Fang, Jun; Eberle, Aaron P R; Castañeda-Priego, Ramón; Wagner, Norman J
Physical review letters, 2013-May-17, Letnik: 110, Številka: 20Journal Article
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.
