. . "In one embodiment, the present invention relates to a modified particle comprising a particle having attached a group having the formula: wherein A represents an aromatic group or an alkyl group which is attached to the particle; R1 represents a bond, an arylene group, an alkylene group, wherein R4 is an alkyl or alkylene group or an aryl or arylene group; R2 and R3, which can be the same or diffe" . . . .