A1 Refereed original research article in a scientific journal
Microrheology close to an equilibrium phase transition
Authors: Reinhardt, J.; Scacchi, A.; Brader, J. M.
Publisher: AMER INST PHYSICS
Publishing place: MELVILLE
Publication year: 2014
Journal:Journal of Chemical Physics
Journal name in sourceJOURNAL OF CHEMICAL PHYSICS
Journal acronym: J CHEM PHYS
Article number: 144901
Volume: 140
Issue: 14
Number of pages: 10
ISSN: 0021-9606
eISSN: 1089-7690
DOI: https://doi.org/10.1063/1.4870497
Abstract
We investigate the microstructural and microrheological response to a tracer particle of a two-dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase boundary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the concentration of colloidal particles is strongly depleted. The tendency of the liquid to cavitate is characterized by a dimensionless "colloidal cavitation" number. On the gas side of the binodal, a pulled (attractive) tracer leaves behind it an extended trail of colloidal liquid, arising from downstream advection of a wetting layer on its surface. For both situations the velocity dependent friction is calculated. (C) 2014 AIP Publishing LLC.
We investigate the microstructural and microrheological response to a tracer particle of a two-dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase boundary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the concentration of colloidal particles is strongly depleted. The tendency of the liquid to cavitate is characterized by a dimensionless "colloidal cavitation" number. On the gas side of the binodal, a pulled (attractive) tracer leaves behind it an extended trail of colloidal liquid, arising from downstream advection of a wetting layer on its surface. For both situations the velocity dependent friction is calculated. (C) 2014 AIP Publishing LLC.
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