Extensive study of cage effect and subdiffusion in Pickering emulsions using molecular dynamics simulations

OAJ Materials and Devices

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Title Extensive study of cage effect and subdiffusion in Pickering emulsions using molecular dynamics simulations
Creator EL-MOUDNY, Soukaina

Description In this work, we aim at an extensive study of the diffusion phenomenon of oil-droplets dispersed in water onto which are strongly adsorbed charged point-like particles (Pickering emulsions). This diffusion that originates from multiple collisions with the molecules of water, is anomalous, due to the presence of relatively strong correlations between the moving oil-droplets. Using Molecular Dynamic simulation, with a pair-potential of Sogami-Ise type, we first observe that the random walkers execute a normal diffusion, at intermediate time, followed by a slow diffusion (subdiffusion) we attribute to the presence of cages, formed by the nearest neighbors (traps). In the cage-regime, we find that the mean-square-displacement increases according to a time-power law, with an anomalous diffusion exponent between 0 and 1. The existence of a cage effect is shown also by computing the velocity auto-correlation function of the random walker. It is found that, in a cage, this function is governed by an underdamped (oscillatory) behavior, for strong densities and surface charges, and low-salt concentration. In the inverse situation, however, we observe that this correlation-function is rather overdamped (non-oscillatory). In the two cases, at large-time, this function fails according to a time-power law
Publisher Collaborating Academics
Date 2018-05-04
Type info:eu-repo/semantics/article
Peer-reviewed Article
Format application/pdf
Identifier http://caip.co-ac.com/index.php/materialsanddevices/article/view/47
Source Materials and Devices; Vol 3, No 1 (2018)
Language eng
Relation http://caip.co-ac.com/index.php/materialsanddevices/article/view/47/27
Rights Copyright (c) 2018 Soukaina EL-MOUDNY, Mabrouk BENHAMOU

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