Matt Sullivan et al 2003 J. Phys.: Condens. Matter 15 S11 doi:10.1088/0953-8984/15/1/302
Matt Sullivan1, Kun Zhao1, Christopher Harrison1, Robert H Austin1, Mischa Megens1, Andrew Hollingsworth2, William B Russel2, Zhengdong Cheng3, Thomas Mason3 and P M Chaikin1,3
Show affiliationsWe have used a variety of different applied fields to control the density, growth, and structure of colloidal crystals. Gravity exerts a body force proportional to the buoyant mass and in equilibrium produces a height-dependent concentration profile. A similar body force can be obtained with electric fields on charged particles (electrophoresis), a temperature gradient on all particles, or an electric field gradient on uncharged particles (dielectrophoresis). The last is particularly interesting since its magnitude and sign can be changed by tuning the applied frequency. We study these effects in bulk (making 'dielectrophoretic bottles' or traps), to control concentration profiles during nucleation and growth and near surfaces. We also study control of non-spherical and optically anisotropic particles with the light field from laser tweezers.
Issue 1 (15 January 2003)
Received 16 October 2002
Published 16 December 2002
Matt Sullivan et al 2003 J. Phys.: Condens. Matter 15 S11
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