ORGN 408 |
| Suk-Wah Tam-Chang, Jennifer Helbley, Wonewoo Seo, Sadeea Qureshi, Kyle Rove, and Travis D. Carson. Department of Chemistry, University of Nevada, Reno, NV 89557 |
| We developed a novel approach to generate micropatterns of anisotropic organic materials. This approach exploits the self-organization, driven by pi-stacking and hydrophobic interactions, of ionic polyaromatic compounds in aqueous solutions. Slow evaporation of solvent from an isotropic solution of the ionic aromatic compound resulted in the development of a chromonic liquid-crystalline phase with ribbon-like domains in which the mesogens were anisotropically oriented. When the solution on a PDMS template with micropatterns was concentrated by evaporating the solvent slowly under a cover slip, the micropatterns guided the direction of the growth of the chromonic ribbons. After the entire solution became liquid-crystalline and anisotropic, the sample was dried to yield a micropatterned anisotropic solid that was then transferred to the glass cover slip by peeling off the PDMS template. These oriented solids exhibit anisotropic optical properties and served as micro-sized polarizers. |
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Materials, Devices, and Switches
8:00 AM-12:00 PM, Wednesday, March 31, 2004 Anaheim Convention Center -- 303A, Oral
Division of Organic Chemistry |