Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 541393
Title Self-assembly of ellipsoidal particles at fluid-fluid interfaces with an empirical pair potential
Author(s) Luo, Alan M.; Vermant, Jan; Ilg, Patrick; Zhang, Zhenkun; Sagis, Leonard M.C.
Source Journal of Colloid and Interface Science 534 (2019). - ISSN 0021-9797 - p. 205 - 214.
DOI https://doi.org/10.1016/j.jcis.2018.08.114
Department(s) VLAG
Physics and Physical Chemistry of Foods
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Capillary interactions - Ellipsoidal particles - Empirical pair potential - Fluid-fluid interfaces - Self-assembly
Abstract

Colloidal particles adsorbed at fluid-fluid interfaces interact via mechanisms that can be specific to the presence of interfaces, for instance, lateral capillary interactions induced by nonspherical particles. Capillary interactions are highly relevant for self-assembly and the formation of surface microstructures, however, these are very challenging to model due to the multibody nature of capillary interactions. This work pursues a direct comparison between our computational modelling approach and experimental results on surface microstructures formed by ellipsoidal particles. We begin by investigating the accuracy of using pairwise interactions to describe the multibody capillary interaction by contrasting exact two- and three-particle interaction energies and we find that the pairwise approximation appears reasonable for the experimentally relevant configurations studied. We then develop an empirical pair potential and use it in Monte-Carlo type simulations to efficiently model the structure formation process for relevant particle properties such as aspect ratio, contact angle and surface coverage, and succeed in reproducing our experimental observations where we spread sterically-stabilised ellipsoidal particles onto an oil-air interface at high surface coverage. At lower surface coverages, we find that the self-assembly process falls into the diffusion-limited colloid aggregation universality class.

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