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Modified Spin-coating Technique to Achieve Directional Colloidal Crystallization
Authors: Bartlett, A.P. (Andrew P.)
Pichumani, M. (Moorthi)
Giuliani, M. (Maximiliano)
González-Viñas, W. (Wenceslao)
Yethiraj, A. (Anand)
Keywords: Materias Investigacion::Física
Issue Date: 2012
Publisher: American Chemical Society
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ISSN: 0743-7463
Citation: A.P. Bartlett & M. Pichumani & M. Giuliani & W. González-Viñas & A. Yethiraj. [2012] 'Modified spincoating technique to achieve directional colloidal crystallization' Langmuir 28(6), 3067
Fabricating large single crystals with colloidal spheres as building blocks is challenging and of competitive interest. Spin-coating of colloids offers a robust technique, which is highly reproducible in obtaining colloidal crystals even at fast dynamical regimes; however, these crystals are intrinsically polycrystalline due to the axial symmetry of spin-coating. We report a new method that applies a nonuniform electric field during the spin-coating process. By arranging the field direction to be stationary in the rotating frame, we are able to break the axial symmetry and to orient the colloids along one predefined direction. By regulating the applied field strength, we demonstrate local control over the orientation of the crystallites, and thus, the orientation is determined by the applied field strength.
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