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Welcome to Kelly Malone's Homepage! |
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I am currrently pursuing a Ph.D. in Chemistry at Auburn University, specializing in Physical Chemistry. |
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I. Reversible Formation of Gold Nanoparticles in Gel Matricies |
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This photo shows the gold particles within the gel matrix. These are formed first by swelling a crosslinked polymer of DADMAC with a methanolic solution of Au(III). The Au(III) acts as a chromophore when exposed to UV light of wavelength 350nm. The solvent acts as the electron donor. The process occurs in two steps. In the first step, the chromophore is photoreduced to form Au(I). The sample is bleached during this step. The transition from yellow (Au(III)) to colorless (Au(I)) is followed using UV-Visible spectroscopy. The next step involves further reduction of Au(I) to form metallic gold, upon continued irradiation. Through photonic efficiency calculations, it was found that the reduction of the chromophore involves a chain process, and the formation of particles involves a biphotonic process. Both processes were found to follow apparent zero-order rate laws. |
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You are the |
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person to visit. Thank You! |
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