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Title: Aggregation of discoidal particles due to depletion interaction
Author: Calero Borrallo, Carles
Diaz-Morata, M.
Pagonabarraga Mora, Ignacio
Keywords: Col·loides
Agregació (Química)
Partícules (Matèria)
Aggregation (Chemistry)
Issue Date: 1-Jun-2021
Publisher: American Institute of Physics (AIP)
Abstract: Depletion interactions between colloids of discoidal shape can induce their self-assembly into columnar aggregates. This is an effect of entropic origin with important implications in a range of colloidal systems, particularly in the clustering of erythrocytes that determine the rheological properties of blood. Here, we investigate the equilibrium state reached by discoidal colloids in a solution of smaller depletant particles. We develop a thermodynamic model of depletion-induced aggregation based on self-assembly theory and solve it analytically. We test the validity of the model by using Langevin simulations of a system of discs and depletant particles in which the depletion interaction emerges naturally. In addition, we consider the effect of an attractive interaction between depletant and discoidal particles, which we show induces a re-entrant dependence of aggregation with temperature.
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It is part of: Journal of Chemical Physics, 2021, vol. 155, p. 074904
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))
Articles publicats en revistes (Física de la Matèria Condensada)
Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))

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