Three-dimensional self-assembly by ice crystallization

Three-dimensional self-assembly of colloidal particles by ice crystallization is observed in a water based-colloidal suspension. When water containing polystyrene beads freezes and is crystalized into ice, the polystyrene beads are extruded outward from the ice regions. Consequently, the concentration of polystyrene beads increases rapidly and they are assembled together into a regular structure. As ice crystallization proceeds, a color appears abruptly. This indicates that the polystyrene beads have been assembled three dimensionally. The generated three-dimensional structure is confirmed by scanning electron microscopy images and the existance of a photonic band gap measured by an ultraviolet-visible spectrophotometer. The sample fabricated by this method is compared with a sample made by conventional vertical deposition. (C) 2002 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2002-06
Language
ENG
Keywords

3-DIMENSIONAL PHOTONIC CRYSTAL; PARTICLES; QUALITY; RESIN

Citation

APPLIED PHYSICS LETTERS, v.80, no.22, pp.4133 - 4135

ISSN
0003-6951
URI
http://hdl.handle.net/10203/5023
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
Appl Phys Lett_vol.80_p4133_Jun 2002.pdf(582.01 kB)Download
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