Abstract
Some silica modification such as carplex and ground quartz particle, gives rise to the bands near 950 cm−1. This band has no relation with the skeletal structure of Si–O bond and can not be explained as overtone or combination tone. It is reasonable to assign this band to O–H deformation vibration of silanol group. The effect of particle size and grinding time on the spectrum of quartz was examined and it was concluded that the ground quartz particle was covered by some irregular structure on its surface, which was different from quartz structure. In this surface structure, the silanol group seems to be constructed.

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