The eﬀects of b-irradiation on the OH-related infrared (IR) absorption band in synthetic wet silica samples have been investigated byFourier transform infrared spectroscopy. Depending on the accumulated doses, b-irradiation aﬀects diﬀerent zones of the IR compositeband at about 3670 cm 1 , assigned to the OH stretching modes of silanol groups. These modiﬁcations are independent of the original OHcontent. The results are discussed considering possible radiation-induced changes of the silanol bonding conﬁguration and of the glassnetwork. These are monitored by revealing the IR band a 2260 cm 1 , which is related to the distribution of Si–O–Si bond angle. We haveidentiﬁed the existence of two regimes as a function of radiation dose; low radiation doses produce the reduction of the „Si-OH hydrogen-bonded states in favor of the isolated ones, while the opposite eﬀect is observed at higher doses, where the formation of H-bondedpairs seems to be favored.2007 Elsevier B.V. All rights reserved.
|Numero di pagine||4|
|Rivista||Journal of Non-Crystalline Solids|
|Stato di pubblicazione||Published - 2007|
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