Gold-induced crystallization of SiO2 and TiO2 powders

被引：27
|
作者：
Perkas, N
Pol, VG
Pol, SV
Gedanken, A [1 ]
机构：
[1] Bar Ilan Univ, Dept Chem, Ctr Adv Mat & Nanotechnol, IL-52900 Ramat Gan, Israel
[2] Bar Ilan Univ, Kanbar Lab Nanomat, Ctr Adv Mat & Nanotechnol, IL-52900 Ramat Gan, Israel
来源：
CRYSTAL GROWTH & DESIGN | 2006年 / 6卷 / 01期
关键词：
D O I：
10.1021/cg050018r
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Gold nanoparticles with an average size of similar to 5 nm have been deposited with the aid of power ultrasound on the surface of silica submicrospheres and on the surface of mesoporous titania. The sonochemical reduction of the gold ions is carried out by ultrasonic irradiation under argon-hydrogen atmosphere. A unique crystallization process of the silica and titania particles has been observed and characterized by X-ray powder diffraction, transmission electron microscopy, differential scanning calorimetry, and BET measurements. The crystallization process of the substrates (silica or titania) is assisted by the gold nanoparticles yielding the cristobalite phase of silica at a relatively low temperature and the anatase phase of titania at the temperature of the sonication bath (80 degrees C).
引用
收藏
页码：293 / 296
页数：4
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