Dynamical density functional theory with hydrodynamic interactions and colloids in unstable traps

Details Dynamical density functional theory with hydrodynamic interactions and colloids in unstable traps Dynamical density functional theory with hydrodynamic interactions and colloids in unstable traps

2008-03-13

arxiv.org/abs/0803.2009v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.101.148302

A density functional theory for colloidal dynamics is presented which includes hydrodynamic interactions between the colloidal particles. The theory is applied to the dynamics of colloidal particles in an optical trap which switches periodically in time from a stable to unstable confining potential. In the absence of hydrodynamic interactions, the resulting density breathing mode, exhibits huge oscillations in the trap center which are almost completely damped by hydrodynamic interactions. The predicted dynamical density fields are in good agreement with Brownian dynamics computer simulations.

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