Interparticle potential and drag coefficient in nematic colloids.

Phys Rev Lett

Department of Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia.

Published: May 2006

Magneto-optic tweezers were used for measurements of liquid-crystal-mediated forces between spherical beads with tangential anchoring in thin nematic samples. Repulsive force, which results from the quadrupolar symmetry of defects around the immersed beads, decreases proportionally to 1/x6, with x being the bead separation. The velocity with which the particles are pushed apart also follows the same separation dependence. We thus find the effective drag coefficient gamma(eff) independent of x for surface-to-surface distances as small as 10% of the bead diameter.

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http://dx.doi.org/10.1103/PhysRevLett.96.207801DOI Listing

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