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- W1510335311 abstract "The method of ‘electrophoretic deposition of charged polymer colloids on patterned substrates’ allows an independent control of colloidal crystal structure, orientation and crystal thickness. Patterned surfaces predetermine the location of colloidal particles on the surface and an electric field acts as a driving force in the colloidal crystallization process. The technique was successfully applied to grow single and binary colloidal monolayers, colloidal crystals with FCC crystal structures and (111), (100) and (110) plane orientations, BCC colloidal crystals grown from a (100) crystal plane, nonclose-packed colloidal multilayers with a HCP crystal sequence and binary colloidal crystals with NaCl and AlB2 analog structures. Deposition parameters such as electric-field strength, colloid concentration, surface charge density, withdrawal speed of electrodes, etc. were shown to play an important role in colloidal crystal growth. It was found that colloidal particles with low surface charge densities allowed a better control over colloidal crystallization. An optimal deposition voltage of 3.5 V was found for colloidal crystal growth. Layer-by-layer electrophoretic deposition of colloidal particles with mono- and bimodal distributions on electrode surfaces with periodic patterns was successfully applied. Colloidal binary monolayers with LS, LS2, LS3, LS4 and LS5 stoichiometries were formed by this method on electrode surfaces with square and hexagonal patterns. A decrease in the colloid diameter (D) to pattern periodicity (L) ratio D/L from 1 to 0.75 led to the formation of nonclose-packed binary colloidal monolayers. Layer-by-layer deposition of large and small colloidal particles with radii ratios of 0.41 and 0.49 on square and hexagonal patterns, respectively, led to the formation of binary colloidal crystals with atomic analogs as NaCl and AlB2, respectively. Planar defects could be introduced in colloidal crystals in the form of deposited mono- (multi-) layers of colloidal particles with a colloid diameter different from the colloidal particles forming the main crystal. Growth of nonclose-packed colloidal crystals formed by colloidal particles of the same size and charge was successfully performed. Formation of nonclose-packed colloidal crystals with an A-B-A sequence (analogous to the HCP crystal structure) on hexagonally patterned surfaces with a D/L ratio of 0.75 was demonstrated. Layer-by-layer electrophoretic deposition of colloidal particles on patterned electrode surfaces is a powerful method for the fabrication of nonclose-packed and binary colloidal crystals with various crystal structures." @default.
- W1510335311 created "2016-06-24" @default.
- W1510335311 creator A5024226675 @default.
- W1510335311 creator A5024688166 @default.
- W1510335311 creator A5072260041 @default.
- W1510335311 date "2009-06-12" @default.
- W1510335311 modified "2023-09-26" @default.
- W1510335311 title "Defined Colloidal 3D Architectures" @default.
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