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Numerical analysis of Pickering emulsion stability: insights from ABMD simulations

Sicard, F; Striolo, A; (2016) Numerical analysis of Pickering emulsion stability: insights from ABMD simulations. Faraday Discussions , 191 pp. 287-304. 10.1039/c6fd00055j. Green open access

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Abstract

The issue of the stability of Pickering emulsions is tackled at a mesoscopic level using dissipative particle dynamics simulations within the Adiabatic Biased Molecular Dynamics framework. We consider the early stage of the coalescence process between two spherical water droplets in a decane solvent. The droplets are stabilized by Janus nanoparticles of different shapes (spherical and ellipsoidal) with different three-phase contact angles. Given a sufficiently dense layer of particles on the droplets, we show that the stabilization mechanism strongly depends on the collision speed. This is consistent with a coalescence mechanism governed by the rheology of the interfacial region. When the system is forced to coalesce sufficiently slowly, we investigate at a mesoscopic level how the ability of the nanoparticles to stabilize Pickering emulsions is discriminated by nanoparticle mobility and the associated caging effect. These properties are both related to the interparticle interaction and the hydrodynamic resistance in the liquid film between the approaching interfaces.

Type: Article
Title: Numerical analysis of Pickering emulsion stability: insights from ABMD simulations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c6fd00055j
Publisher version: http://dx.doi.org/10.1039/c6fd00055j
Language: English
Additional information: Copyright © The Royal Society of Chemistry 2016.
Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, Molecular-dynamics Simulations, Mesoscopic Simulation, Water/oil Interface, Self-diffusion, Nanoparticles, Coalescence, Particles, Systems, Fluid, Behavior
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1503514
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