COLL 168 |
| Yoon Seob Lee and James F. Rathman. Department of Chemical Engineering, The Ohio State University, 140W, 19th Ave., Columbus, OH 43210 |
| This paper presents the discovery of an extremely stable water-based sol containing cetyltrimethylammonium chloride, n-decyl alcohol, benzene, and silica species. The total concentration of active species is ~25 wt.%. This sol is remarkably stable; solutions that remain single-phase and transparent at room temperature in a closed container for more than four years have been demonstrated. The primary goal of this paper was to investigate the unusual properties of this sol. Detailed structural analysis was conducted using FT-IR, NMR, SANS, SAXS, FF-TEM, and X-ray diffraction. Results from these diverse characterization techniques are very consistent and indicate the sol contains rod-shaped micellar aggregates coated with low-molecular weight silica oligomers. Rapid gelation is triggered upon contact with water at various fluid/fluid interfaces. The resultant films always show well-developed nanostructures. Thus make this sol a facile precursor for the preparation of a variety of nanostructured silica films with great versatility. |
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Nanoscience and Nanotechnology
2:00 PM-5:15 PM, Monday, March 29, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |