CHED 414 |
| Optical micrographs (both brightfield and darkfield) were obtained for the Ce(IV)/SiO2 solid-supported reagent, prepared by adsorbing ceric ammonium nitrate (CAN) onto silica gel. Heterogeneous mixtures of three types of coated particles (clear and colorless, translucent, and opaque) result for weight ratios of CAN to silica gel at 20:100 or above. It was observed that crystals of CAN form when the surface of some particles of silica gel become saturated beyond monolayer coverage of the inorganic reagent, and these continue to grow until the solid support is wholly encased. We now report the first images obtained for these samples with a Hitachi S-3400N scanning electron microscope (SEM) and will describe details of their surface morphology not clearly resolved with optical microscopy even at a magnification of 1000 times. Partial support from the Undergraduate Research Council of the College of Basic and Applied Sciences at Middle Tennessee State University is gratefully acknowledged. |
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Undergraduate Research Poster Session: Organic Chemistry
11:00 AM-1:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster
Division of Chemical Education |