Suppression of electroosmosis with hydrolytically stable coating

Details Suppression of electroosmosis with hydrolytically stable coating Suppression of electroosmosis with hydrolytically stable coating

1991-09-16

1992-09-01

Niebling, John

Coating processes

With pretreatment of the base

427399, 427302, 204299R, 2041801, 423341, B05D 300, B05D 304

Patent

active

051437538

ABSTRACT:
Surfaces of silica-containing materials, such as the inner walls of silica capillaries, used in chromatographic, particularly electrophoretic, separations are coated with an organic polymer layer to reduce or eliminate surface charges. The layer is applied by first converting the silanol groups on the surface to silicon halide groups, then reacting these groups with an organometallic reagent having a terminal ethenyl moiety, preferably vinyl or allyl lithium or a vinyl or allyl magnesium halide, to convert the silicon halide groups to Si--R groups where the R retains the terminal ethenyl moiety, and finally reacting these ethenyl groups newly attached to the surface with a neutral organic monomer in an addition polymerization reaction to form a monomolecular noncrosslinked polymer layer over the surface. The resulting polymer layer is linked to the silica directly through a Si--C bond which is stable over a wide range of pH conditions.

REFERENCES:
patent: 5017540 (1991-05-01), Sandoval et al.

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