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  • Title: Vertical arrays of anisotropic particles by gravity-driven self-assembly.
    Author: Smith BD, Kirby DJ, Keating CD.
    Journal: Small; 2011 Mar 21; 7(6):781-7. PubMed ID: 21425463.
    Abstract:
    Anisotropic particles assemble to spontaneously form columnar arrays. Hybrid nanotube/nanowire particles (silica nanotubes partially filled with metallic cores) deposit with their denser metallic ends towards the surface, orienting them vertically. Up to 84% are observed to be standing over a 0.64 cm(2) area within 15 min. Standing percentage is found to be dependent on particle surface concentration.
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