γ radiolyzed amorphous silica:: A study with 29Si CP-MAS NMR spectroscopy

被引：13

作者：

Cataldo, Franco ^{[1
]}

Capitani, Donatella ^{[2
]}

Proletti, Noemi ^{[2
]}

Ragni, Pietro ^{[2
]}

机构：

[1] Lupi Chem Res Inst, I-00133 Rome, Italy

[2] CNR, Inst Chem Metodol, I-00016 Rome, Italy

来源：

RADIATION PHYSICS AND CHEMISTRY | 2008年 / 77卷 / 03期

关键词：

amorphous precipitated silica; irradiation; gamma radiolysis; Si-29 CP-MAS NMR spectroscopy; chemical structure changes; silanols; peroxysilanols; crosslinking;

D O I：

10.1016/j.radphyschem.2007.05.010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Precipitated amorphous silica has been gamma radiolyzed at 333, 666 and 1000 kGy in air. The structural changes undergone during irradiation have been studied by Si-29 CP-MAS NMR spectroscopy. The spectra suggest that silica looses the hydrogen atoms attached to the silanol groups and the resulting silanol radicals undergo a crosslinking reaction by forming peroxysiloxane groups or by reacting with E' centres yielding siloxane groups. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：267 / 272

页数：6

共 23 条

[1] Intrinsic defects induced by β-irradiation in silica [J].