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Clustering and gelation of hard spheres induced by the Pickering effect.

Fortini, A (2012) Clustering and gelation of hard spheres induced by the Pickering effect. Phys Rev E Stat Nonlin Soft Matter Phys, 85 (4 Pt 1).

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A mixture of hard-sphere particles and model emulsion droplets is studied with a Brownian dynamics simulation. We find that the addition of nonwetting emulsion droplets to a suspension of pure hard spheres can lead to both gas-liquid and fluid-solid phase separations. Furthermore, we find a stable fluid of hard-sphere clusters. The stability is due to the saturation of the attraction that occurs when the surface of the droplets is completely covered with colloidal particles. At larger emulsion droplet densities a percolation transition is observed. The resulting networks of colloidal particles show dynamical and mechanical properties typical of a colloidal gel. The results of the model are in good qualitative agreement with recent experimental findings [E. Koos and N. Willenbacher, Science 331, 897 (2011)] in a mixture of colloidal particles and two immiscible fluids.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Date : April 2012
DOI : 10.1103/PhysRevE.85.040401
Uncontrolled Keywords : Colloids, Computer Simulation, Emulsions, Microspheres, Models, Chemical, Models, Molecular
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:16
Last Modified : 24 Jan 2020 23:43

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