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Assembly of Films of Janus Particles Janus particles are particles that have different surfaces on opposite sides. Prof. Kretzschmar (CCNY), seed member of the Columbia MRSEC, has made two very different types of Janus particles, by depositing either a rough layer of silver or a smooth layer of gold on one half of polystyrene spheres. She has shown that when these particles are deposited after flow (convective assembly), they unexpectedly form very different structures; the rough Ag-capped particles form three-dimensional clusters, whereas the smoother Au-capped particles are forced into a two-dimensional monolayer (bottom picture). Because these particles and the films they form are not isotropic, structures made from them may have optical properties that are important for photonic applications.
Posted on: March 20, 2008 For more information contact: Ilona Kretzschmar |
 Janus particles with a (left) rough silver and a (right) smo  Convectively assembled gold-capped particle monolayer |
