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Vertical Arrays of Anisotropic Particles by Gravity‐Driven Self‐Assembly
Author(s) -
Smith Benjamin D.,
Kirby David J.,
Keating Christine D.
Publication year - 2011
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201002233
Subject(s) - materials science , anisotropy , nanowire , particle (ecology) , metal , nanotechnology , nanotube , self assembly , surface (topology) , carbon nanotube , composite material , optics , geometry , metallurgy , oceanography , physics , mathematics , geology
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.