A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Local phase transitions in driven colloidal suspensions
Tekijät: Scacchi, A.; Brader, J. M.
Kustantaja: TAYLOR & FRANCIS LTD
Kustannuspaikka: ABINGDON
Julkaisuvuosi: 2018
Journal: Molecular Physics
Tietokannassa oleva lehden nimi: MOLECULAR PHYSICS
Lehden akronyymi: MOL PHYS
Vuosikerta: 116
Numero: 3
Aloitussivu: 378
Lopetussivu: 387
Sivujen määrä: 10
ISSN: 0026-8976
eISSN: 1362-3028
DOI: https://doi.org/10.1080/00268976.2017.1393117
Tiivistelmä
Using dynamical density functional theory and Brownian dynamics simulations, we investigate the influence of a driven tracer particle on the density distribution of a colloidal suspension at a thermodynamic state point close to the liquid side of the binodal. In bulk systems, we find that a localised region of the colloid-poor phase, a 'cavitation bubble', forms behind the moving tracer. The extent of the cavitation bubble is investigated as a function of both the size and velocity of the tracer. The addition of a confining boundary enables us to investigate the interaction between the local phase instability at the substrate and that at the particle surface. When both the substrate and tracer interact repulsively with the colloids we observe the formation of a colloid-poor bridge between the substrate and the tracer. When a shear flow is applied parallel to the substrate the bridge becomes distorted and, at sufficiently high shear-rates, disconnects from the substrate to form a cavitation bubble.[GRAPHICS].
Using dynamical density functional theory and Brownian dynamics simulations, we investigate the influence of a driven tracer particle on the density distribution of a colloidal suspension at a thermodynamic state point close to the liquid side of the binodal. In bulk systems, we find that a localised region of the colloid-poor phase, a 'cavitation bubble', forms behind the moving tracer. The extent of the cavitation bubble is investigated as a function of both the size and velocity of the tracer. The addition of a confining boundary enables us to investigate the interaction between the local phase instability at the substrate and that at the particle surface. When both the substrate and tracer interact repulsively with the colloids we observe the formation of a colloid-poor bridge between the substrate and the tracer. When a shear flow is applied parallel to the substrate the bridge becomes distorted and, at sufficiently high shear-rates, disconnects from the substrate to form a cavitation bubble.[GRAPHICS].
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