Modified Spin-coating Technique to Achieve Directional Colloidal Crystallization
| Autor: | Moorthi Pichumani, Andrew P. Bartlett, Wenceslao González-Viñas, Anand Yethiraj, Maximiliano Giuliani |
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| Rok vydání: | 2012 |
| Předmět: |
Spin coating
Materials science Condensed matter physics Field (physics) business.industry Field strength Surfaces and Interfaces Colloidal crystal Condensed Matter Physics Condensed Matter::Soft Condensed Matter Optics Electric field Electrochemistry General Materials Science SPHERES Crystallite business Axial symmetry Spectroscopy Física [Materias Investigacion] |
| Zdroj: | Dadun. Depósito Académico Digital de la Universidad de Navarra instname |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la204123s |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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