In situ vibrational study of SiO2/liquid interfaces
10 April 2002
The surface of SiO2 in contact with a liquid has been studied ill Situ by Fourier transform infrared spectroscopy, electrochemistry and ab initio quantum chemical Calculations. Experimental issues arising from the cell designed have been addressed, notably the influence of the medium above the SiO2 film oil the line shape of the Si-O vibrations. Using electrical potential control of the surface with electrochemistry, the hydrated states of the SiO2 surface have been identified, featuring a neutral equivalent toSiOH species and pentavalent equivalent toSi(OH)OH- anionic centers. (C) 2002 Elsevier Science B.V. All rights reserved.