The damage imparted to porous silica by argon bombardment is stabilized and marked by carrying out the bombardment in a controlled CO2 atmosphere. IR spectroscopy shows that CO2 is inserted via the formation of carboxylate groups which, on heat treatment at 500 °C, are converted to ester-like groups and, eventually, after exposure to wet air, to carboxylic groups. Dehydration of these structures restores the ester sites almost reversibly.
G. F. Cerofolini, L. Meda, C. Spaggiari, G. Conti and G. M. Garbasso, J. Chem. Soc., Faraday Trans., 1996, 92, 2453 DOI: 10.1039/FT9969202453
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