Journal
JOURNAL OF APPLIED PHYSICS
Volume 99, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2179196
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We developed an inexpensive and simple system for three-dimensional self-assembly of micron-sized nonmagnetic particles into millimeter-scale structures using the differential pressure exerted by ferrofluids in the presence of magnetic field gradients. We demonstrate it by assembling separate individual 5, 10, and 21 mu m diam polystyrene beads into millimeter-sized spherical and ellipsoidal structures. The system can also self-organize its smaller components by volume and provide compressive forces of hundreds of piconewtons on millimeter-scale structures. Extensions of this method have assembled multicellular systems. (c) 2006 American Institute of Physics.
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