Controlling colloidal sedimentation using time dependent shear

Abstract

Employing a recently developed dynamical density functional theory we study the response of a colloidal sediment above a wall to shear, demonstrating the time dependent changes of the density distribution and its center-of-mass after switching shear either on or off and under oscillatory shear. Following the onset of steady shear we identify two dynamical mechanisms, distinguished by their timescales. Shortly after the onset, a transient enhancement of the packing structure at the wall reflects the self-organization into lanes. On a much longer timescale these effects are transmitted to the bulk, leading to migration away from the wall and an increase in the center-of-mass. Under oscillatory shear flow the center-of-mass enters a stationary state, reminiscent of a driven damped oscillator.

6 pages, 4 figures

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Cited by in corpus (13)

• Classical dynamical density functional theory: from fundamentals to applications
• Velocity gradient power functional for Brownian dynamics
• Driven colloidal suspensions in confinement and density functional theory: Microstructure and wall-slip
• Structural nonequilibrium forces in driven colloidal systems
• Dynamics of localized particles from density functional theory
• Flow of colloidal solids and fluids through constrictions: dynamical density functional theory versus simulation
• A Gaussian theory for fluctuations in simple liquids
• Density Functional approach to Nonlinear Rheology
• Stochastic Density Functional Theory on Lane Formation in Electric-Field-Driven Ionic Mixtures: Flow-Kernel-Based Formulation
• Length-scales in sheared soft matter depend sensitively on molecular interactions
• Local phase transitions in driven colloidal suspensions
• Superadiabatic dynamical density functional theory for colloidal suspensions under homogeneous steady-shear
• A Mean Field Model of Layering Instability in Shearing Suspensions