Extensive study of cage effect and subdiffusion in Pickering emulsions using molecular dynamics simulations
OAJ Materials and Devices
View Publication Info| Field | Value | |
| Title |
Extensive study of cage effect and subdiffusion in Pickering emulsions using molecular dynamics simulations
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| Creator |
EL-MOUDNY, Soukaina
BENHAMOU, Mabrouk |
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| Subject |
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| 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
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| Publisher |
Collaborating Academics
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| Contributor |
—
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| Date |
2018-05-04
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| Type |
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion Peer-reviewed Article |
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| Format |
application/pdf
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| Identifier |
http://caip.co-ac.com/index.php/materialsanddevices/article/view/47
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| Source |
Materials and Devices; Vol 3, No 1 (2018)
24953911 |
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| Language |
eng
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| Relation |
http://caip.co-ac.com/index.php/materialsanddevices/article/view/47/27
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| Rights |
Copyright (c) 2018 Soukaina EL-MOUDNY, Mabrouk BENHAMOU
http://creativecommons.org/licenses/by-nc-nd/4.0 |
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