Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Micro and Nano Fluidics II: Slipping + soft objects in flow

CPP 27.9: Talk

Thursday, February 28, 2008, 16:00–16:15, C 264

Hydrodynamic lift forces on solute particles in a nanotube forest — •Vladimir Lobaskin and Roland Netz — Physik Department T37, TU München, 85747 Garching

We apply theory and hybrid Langevin dynamics -- lattice Boltzmann simulations to study shear-induced molecular transport in polymer solutions and colloidal dispersios close to an interface modified by a grafted inclined hard posts (carbon nanotube forest) or brush of semiflexible polymer segments. We show that the excluded volume interactions of particles and polymer chains with the posts lead to appearance of residual hydrodynamic size-dependent lift forces, which can promote a depletion of the solute from the forest or its accumulation at the surface and serve as a basis of sseparation techniques.