Microrheology close to an equilibrium phase transition

作者：Reinhardt J^*; Scacchi A; Brader J M

来源：Journal of Chemical Physics, 2014, 140(14): 144901.

DOI：10.1063/1.4870497

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 %26quot;colloidal cavitation%26quot; 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.

• 出版日期2014-4-14