Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1491603 | Materials Research Bulletin | 2009 | 4 Pages |
Abstract
Vitreous silica nano-powder, with spherical particles of 50–300 nm in size, was successfully produced via floating combustion synthesis. Mechano-chemically activated and spray-dried Si-powder was oxidized in fluidized bed between 900 °C and 1550 °C in air. After 10 min, rapid removal of powder from the furnace and quenching maintained silica's vitreous nature. The process comprises sequential cycles of the following stages until nano-sized particles of silica are obtained. Superficial melting of Si-particles initially occurs and the particles obtain a spherical shape. The surface of the particles is oxidized. The stress at silica/silicon interface causes collapse of particles to smaller ones.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yuan Zhu, Hai Bo Jin, Ke Gang Ren, Simeon Agathopoulos, Ke Xin Chen,