We demonstrate a novel method to assemble and transport swarms of colloidal particles by combining liquid crystals enabled electrophoresis and photo-sensitive surface patterning. Colloidal particles are propelled in a nematic liquid crystal via application of an alternating current electric field. Swarms of particles are assembled into a rotating mill cluster, or moved as a whole along predefined paths photo-imprinted on chemically functionalized substrates. This technique represents an alternative approach to fluid based lab-on-a-chip technologies guiding the motion of large ensembles of micrometer scale solid or liquid inclusions.
@article{arxiv.1604.04063,
title = {Nematic Colloidal Swarms Assembled and Transported on Photosensitive Surfaces},
author = {Sergi Hernàndez-Navarro and Pietro Tierno and Jordi Ignés-Mullol and Francesc Sagués},
journal= {arXiv preprint arXiv:1604.04063},
year = {2016}
}