Fumed silica can be used for additives to improve the toner fluidity. Triboelectric charge of toner is also affected by surface characters of the fumed silica. Therefore, it is important to study on the relationship between chemical structures of the silica surface and its property. In this review, we describe some measurement methods to estimate silanol groups on the silica surface, and demonstrate the difference of silanol density between before and after various surface modification of fumed

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... silica. We also show the bonding strength between the silica surface and treatment reagents by using pyrolysis GC-MS, and reveal the bonding characters of polydimethylsiloxane on the silica surface by using solid state NMR.