Positronium study of porous structure of sol-gel prepared SiO2:: influence of pH

被引：9
作者：
Misheva, M
Djourelov, N
Margaca, FMA
Salvado, IMM
机构：
[1] BAS, INRNE, Sofia 1784, Bulgaria
[2] Univ Sofia, Fac Phys, BU-1126 Sofia, Bulgaria
[3] ITN, Dept Phys, P-2685 Sacavem, Portugal
[4] Univ Aveiro, UIMC, Glass & Ceram Engn Dept, P-3810 Aveiro, Portugal
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2001年 / 279卷 / 2-3期
关键词：
D O I：
10.1016/S0022-3093(00)00405-1
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：
Positron annihilation lifetime and Doppler broadening of annihilation line techniques have been used to obtain information about the small-pore structure of SiO2 prepared by the alkoxide method in different experimental conditions. Samples prepared in strong acidic environment (pH = 2) contain only small pores with mean radius R similar to 5 Angstrom, while those prepared at pH = 6 and pH = 9 contain pores of two sizes; R similar to 5 and R similar to 17-26 Angstrom. The influence of pH, water/alkoxide molar ratio and temperature of heat-treatment of the samples on their pore structure has been studied. (C) 2001 Elsevier Science B.V. All rights reserved.
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收藏
页码：196 / 203
页数：8
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