Abstract

The interaction of amorphous silica particles with several hydrogen bonding agents (H₂O, C₂H₅OH, C₇H₈NO) was investigated by monitoring the changes in the bulk and surface IR vibrational modes of silica using photoacoustic spectroscopy. It is argued that the intensity of the silanol band at 3747 cm⁻¹ provides (an inverse) quantitative measure of the interaction of surface groups, along with the shift in the broad hydroxyl band, the interaction following the order C₇H₈NO > C₂H₅OH > H₂O.

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