Browsing by Author "Varpness, Zachary Bradley"

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Biomimetic synthesis of catalytic materials
(Montana State University - Bozeman, College of Letters & Science, 2007) Varpness, Zachary Bradley; Chairperson, Graduate Committee: Trevor Douglas; Mary Cloninger (co-chair)
Supramolecular proteins assemblies have been used as platforms for the synthesis of catalytic nanomaterials. These supramolecular structures are assembled from a limited number of subunits that provide a unique structurally defined platform for the synthesis of catalytic nanomaterials. Small heat shock protein (Hsp) and ferritin (Fn) are 12 nm protein cage-like assemblies of 24 subunits that have been used as platforms for the synthesis of noble metal nanoparticles through the in vitro reduction of corresponding ions. Protein encapsulated metal nanoparticles were used as catalysts for photochemical reduction of protons to H2 gas. The maximum catalytic rates of the protein encapsulated platinum nanoparticles are an order of magnitude better than for similarly sized platinum nanoparticles described in the literature. The protein cage increases the activity of the nanoparticles compared to other passivating layers by only minimally coating the particle.