Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2012-03-20
Physics
Condensed Matter
Soft Condensed Matter
Manuscript Submitted to Physical Review Letters, 29th February 2012
Scientific paper
Evaporation-driven particle self-assembly can be used to generate three-dimensional microstructures. We present a new method to create these colloidal microstructures, in which we can control the amount of particles and their packing fraction. To this end, we evaporate colloidal dispersion droplets on a special type of superhydrophobic micro-structured surface, on which the droplet re- mains in Cassie-Baxter state during the entire evaporative process. The remainders of the droplet consist of a massive spherical cluster of the microspheres, with diameters ranging from a few tens up to several hundreds of microns. We present scaling arguments to show how the final particle packing fraction of these balls depends on the dynamics of the droplet evaporation.
Gardeniers Han
Gelderblom Hanneke
Houselt Arie van
Lefferts Leon
Lohse Detlef
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