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.
gamma radiolyzed amorphous silica: a study with 29Si CP-MAS NMR spectroscopy
D Capitani;N Proietti;P Ragni
2008
Abstract
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.File in questo prodotto:
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