Modified surfaces and method for modifying a surface
AssigneesRhodia Inc., Centre National De La Recherche Scientifique
InventorsJean-Paul Chapel, Jean-Christophe Castaing, Ling Qi
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Abstract
A surface modified substrate includes a substrate having a surface, a layer of nanoscale inorganic oxide particles disposed on at least a portion of the surface of the substrate, said layer of nanoscale inorganic oxide particles comprising sites bearing an electric charge of a first polarity, and a monolayer of a polymer disposed on a least a portion of the layer of nanoscale inorganic oxide particles, said monolayer of polymer comprising sites bearing an electric charge of a second polarity, wherein the second polarity is the opposite of the first polarity.
Claims17
A surface modified substrate, comprising:
- (a) a substrate having a surface,
- (b) a monolayer consisting of nanoscale inorganic oxide particles disposed directly on at least a portion of the surface of the substrate, said layer of nanoscale inorganic oxide particles comprising sites that bear an electric charge of a first polarity, the monolayer of nanoscale inorganic particles has a first surface in contact with the surface of the substrate and a second surface oriented away from the surface of the substrate;
- and
- (c) a monolayer of a polymer disposed on and adhered to a least a portion of the monolayer of nanoscale inorganic oxide particles, said monolayer of copolymer comprising sites that bear an electric charge of a second polarity, wherein the second polarity is the opposite of the first polarity, the monolayer of polymer has a first surface in contact with the second surface of the layer of nanoscale inorganic oxide particles and a second surface oriented away from the layer of nanoscale inorganic oxide particles.
A method for modifying the surface of a substrate, comprising the steps of:
- a) treating at least a portion of such surface with a slurry of nanoscale inorganic oxide particles to deposit a monolayer consisting of such nanoscale inorganic oxide particles directly on such portion of such surface, wherein the nanoscale inorganic oxide particles have a first net electrical charge, the monolayer of nanoscale inorganic particles has a first surface in contact with the surface of the substrate and a second surface oriented away from the surface of the substrate;
- and
- b) treating the nanoscale inorganic oxide particle-treated surface with an aqueous solution or dispersion of a polymer, said polymer having a second net electrical charge, at a pH wherein the polarity of the second net electrical charge is the opposite of polarity of the first net electrical charge to deposit a monolayer of the polymer on the monolayer of nanoscale inorganic oxide particle-treated surface, the monolayer of polymer has a first surface in contact with the second surface of the layer of nanoscale inorganic oxide particles and a second surface oriented away from the layer of nanoscale inorganic oxide particles.
Dependencies are inferred from the claim text.