Biocatalytically Templated Synthesis of Titanium Dioxide

Autor:	Daniel E. Morse, Joon Hwan Choi, David Kisailus, Jan L. Sumerel, James C. Weaver, Wenjun Yang
Rok vydání:	2003
Předmět:	Anatase Stereochemistry General Chemical Engineering chemistry.chemical_element General Chemistry Catalysis Enzyme catalysis Hydrolysis chemistry.chemical_compound chemistry Chemical engineering Rutile Biocatalysis Titanium dioxide Materials Chemistry Titanium
Zdroj:	Chemistry of Materials. 15:4804-4809
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm030254u
Popis:	Silicatein, an enzymatic biocatalyst purified from the glassy skeletal elements of a marine sponge, and previously shown capable of catalyzing and structurally directing the hydrolysis and polycondensation of silicon alkoxides to yield silica and silsesquioxanes at low temperature and pressure and neutral pH, is shown to be capable of catalyzing and templating the hydrolysis and subsequent polycondensation of a water-stable alkoxide-like conjugate of titanium to form titanium dioxide. The structure and behavior of the TiO2 formed through this biocatalytic route, including thermally induced crystal grain growth and phase transformation from anatase to rutile, differ from those of TiO2 formed from the same precursor via alkali catalysis or thermal pyrolysis. This enzymatic route affords a path to templated synthesis that avoids the high temperatures and extremes of pH typically required for synthesis of metallo-oxanes from the corresponding alkoxide-like precursors, and thus provides access to a new and pot...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2ea7b2a13d04ea30a0221d87ff6f1127 https://doi.org/10.1021/cm030254u Zobrazit plný text záznamu