(623h) Brownian Dynamic Simulation of the Motion of a Janus Particle Near a Boundary and Under Shear Flow

Brownian Dynamic
Simulation of the Motion of a Janus Particle Near a Boundary and Under Shear
Flow

Zohreh Jalilvand¹, Joel Koplik² and Ilona Kretzschmar¹.

¹Department of Chemical
Engineering, City College of the City University of New York.

²Benjamin Levich institute City College of the City University
of New York.

   Colloidal
particles dispersed in solutions play an important role in
many technological applications such as pharmaceuticals,
cosmetics, colloidal self-assembly and material design. Therefore, to
better understand the behavior of such systems knowing the
interaction between the particles and the boundaries is essential.

In this context, Janus
Particles with anisotropic surface properties possess biased interactions
including particle-particle interaction as well as interaction with the
boundaries due to dynamic orientation of the particle. Motivated by the potential
application, we aim to study the motion of Janus particles under different
conditions such as near a boundary including potential
interactions with a particle close by
and under shear flow.

  We have implemented a Brownian dynamic
simulation to study the motion of a Janus particle near a wall and under
different shear flow conditions while
further investigation will focus
on particle-particle interactions. The stochastic motion of a Janus
particle impacted by surface forces is described using the Langevin equation. An adapted Kern-Frankel model is
employed to take into account the orientation of the particle. We observe
that interactions arising
through surface potentials depend on the separation distance between the
particle and the surface and the properties of the surfaces.