Preparation and formation mechanism of silica-encapsulated palladium particles by spray pyrolysis

被引：7

作者：

Che, SL ^{[1
]}

Sakurai, O ^{[1
]}

Yasuda, T ^{[1
]}

Shinozaki, K ^{[1
]}

Mizutani, N ^{[1
]}

机构：

[1] SUMITOMO MET & MIN CO LTD, OME, TOKYO 198, JAPAN

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 1997年 / 105卷 / 03期

关键词：

microcapsule powder; spray pyrolysis; intraparticle sintering; palladium; silica;

D O I：

10.2109/jcersj.105.269

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Silica-encapsulated palladium particles were formed from a palladium nitrate solution containing ultrafine SiO2 particles by ultrasonic spray pyrolysis. The mechanism of the formation of the encapsulated particles was investigated. A precursor particle formed below 700 degrees C in the drying stage was composed of the homogeneous mixture of the nano-sized SiO2 and PdO . xH(2)O particles. When PdO is decomposed above 700 degrees C, metallic palladium particles are formed in the matrix of silica. Because of the high Surface free energy, the metallic palladium particles coagulate and condense to the composite particle interior. As a result of the relocation within the composite particle, SiO2 is forced out of the particle towards the surface to form a silica-encapsulated palladium particle.

引用

页码：269 / 271

页数：3

共 7 条

[1]

CHE S, 1997, J CERAM SOC JAPAN, V105

[2]

CHE S, 1997, J MAT RES, V12

[3]

CRANE RA, 1995, MATER RES SOC SYMP P, V368, P127

[4] ULTRATHIN PARTICULATE MAGNETIC RECORDING MEDIA [J].