FUNCTIONALISATION OF OXIDIC PARTICLE SURFACES, PARTICLES THUS OBTAINED, AND THE USE THEREOF

摘要

The invention relates to a method for the surface modification of particles consisting of oxidic compounds of metals and/or semimetals M, having M-O-H groups on the surface thereof, and containing, not exclusively, silicon as a metal or semimetal, whereby particles are brought into contact with silicon-halogen compounds under such conditions that the M-O-H groups react with the silicon-halogen compounds. The invention also relates to thus obtained surface-modified particles. In order to produce (additional) M-O-H groups on the surface, the particles can be pre-treated with a strong acid. In a subsequent step, the superficial Si-Halogen groups are reacted with correspondingly reactive compounds in order to produce further modified particles. The inventive particles can also be characterised in that they carry Si-OH groups, Si-X groups (X = halogen) and/or Si-Y groups (Y = organic radical) in a density of at least 2 such groups per nm<2> of surface and/or that there are at least 4 carbon atoms of the organic radicals Y per nm<2> of surface. The invention also relates to the use of such particles as dispersed constituents in various materials for different purposes, and to each material containing distributed inventive particles.