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Author Ye, Y. -H. ♦ Badilescu, S. ♦ Truong, Vo-Van ♦ Rochon, P. ♦ Natansohn, A.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CRYSTAL LATTICES ♦ DRYING ♦ PHYSICS ♦ POLYSTYRENE ♦ SUBSTRATES ♦ SYMMETRY ♦ VECTORS
Abstract We report here on the self-assembly of polystyrene colloidal spheres on patterned substrates. The substrate was a grating with a periodic one-dimensional-height profile. The two-dimensional (2D) arrays of colloidal spheres were obtained by the convective self-assembly method. It is shown that these structures strongly depend on the ratio between the diameter of the sphere (d) and the period of the grating (p) (x=d/p). When 1<x<1.15, and 1.15<x<2, the 2D array showed a centered-rectangular symmetry. For x=1.15 and 2, the ordered 2D array had a hexagonal symmetry structure. The angle between the grating groove direction and the crystal lattice vector ({theta}) is given by {theta}=sin{sup -1}(d/p). It is suggested that the variety of the 2D structures are formed by the capillary forces and the self-shadowing effects during the drying process. {copyright} 2001 American Institute of Physics.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-06
Publisher Place United States
Journal Applied Physics Letters
Volume Number 79
Issue Number 6


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