The UV-visible spectrum in porous type VI silica: Application and theory

被引：14

作者：

West, JK ^{[1
]}

LaTorre, G ^{[1
]}

Hench, LL ^{[1
]}

机构：

[1] UNIV FLORIDA,ADV MAT RES CTR,ALACHUA,FL 32615

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1996年 / 195卷 / 1-2期

关键词：

D O I：

10.1016/0022-3093(95)00529-3

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：

The ultraviolet (UV) through visible (VIS) absorptions are determined and analyzed for porous type VI sol-gel-derived silica optical matrices. Changes in the W-VIS spectral response are related to changes in the texture and molecular structure of the gel silica. There is a significant increase in UV cutoff as the pore size increases from 12 Angstrom to 90 Angstrom radius pores, This result is analyzed using classical scattering theory in combination with semi-empirical molecular orbital (MO) calculations. The concentration of small (three- and four-member) silica rings is a function of the processing temperature and history. As a result the UV absorption is observed to move to larger wavelengths as the number of three-member silica rings increases.

引用

页码：45 / 53

页数：9

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