Building micro-soccer-balls with evaporating colloidal fakir drops
ORAL
Abstract
Drop evaporation can be used to self-assemble particles into three-dimensional microstructures on a scale where direct manipulation is impossible. We present a unique method to create highly-ordered colloidal microstructures in which we can control the amount of particles and their packing fraction. To this end, we evaporate colloidal dispersion drops from a special type of superhydrophobic microstructured surface, on which the drop remains in Cassie-Baxter state during the entire evaporative process. The remainders of the drop 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 drop evaporation dynamics, particle size, and number of particles in the system.
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Authors
Hanneke Gelderblom
Physics of Fluids, University of Twente, The Netherlands
Alvaro Gomez Marin
Bundeswehr University Munich
Institute for Fluid Mechanics and Aerodynamics, Bundeswehr University Munich
Physics of Fluids, University of Twente, The Netherlands
Arturo Susarrey-Arce
Catalytic Processes and Materials, University of Twente, The Netherlands
Arie van Housselt
Catalytic Processes and Materials, University of Twente, The Netherlands
Leon Lefferts
Catalytic Processes and Materials, University of Twente, The Netherlands
Han Gardeniers
Mesoscale Chemical Systems, University of Twente, The Netherlands
Detlef Lohse
University of Twente
Physics of Fluids, University of Twente
U. Twente, Netherlands
Physics of Fluids, University of Twente, The Netherlands
University of Twente, Physics of Fluids
Jacco Snoeijer
Physics of Fluids, University of Twente, The Netherlands
