title: Low-temperature pseudomorphic transformation of ordered hierarchical macro-mesoporous SiO2/C nanocomposite to SiC via magnesiothermic reduction.
abstract: A magnesiothermic reduction synthesis approach is reported for direct conversion of SiO(2)/C composite nanostructures to corresponding SiC materials without losing their nanostructure morphologies. Crystalline SiC materials can be obtained by this approach at a temperature as low as 600 degrees C, only approximately half of that applied in the generally used carbothermal reduction and preceramic polymer pyrolysis methods. An ordered hierarchical macro-mesoporous SiC material was synthesized for the first time as a demonstration. This pseudomorphic transformation can be regarded as a general synthesis method for different kinds of SiC nanostructures, and it can also be readily extended to other metal carbide materials as well as TiC.
authors.affiliation: Department of Chemistry and Biochemistry, University of California at Santa Barbara, California 93106, USA.
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Shi
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Hu
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Sun
authors.forename: Yichi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hyung Ik
authors.initials: HI
authors.lastname: Lee
authors.forename: Liquan
authors.initials: L
authors.lastname: Chen
authors.forename: Galen D
authors.initials: GD
authors.lastname: Stucky