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Precipitated amorphous silica has been γ radiolyzed at 333, 666 and 1000kGy in air. The structural changes undergone during irradiation have been studied by 29 Si 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...
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