Low temperature, nanostructured ceramic coatings

Patent metadata

Field	Value
Publication number	US-2016115081-A1
Application number	US-201514734520-A
Country	US
Kind code	A1
Filing date	Jun 9, 2015
Priority date	Jun 10, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

A substrate subject to degradation at temperatures above 100° C. is coated with a nanostructured ceramic coating having a thickness in excess of 100 nm, formed on a surface of the substrate, wherein a process temperature for deposition of the nanostructured coating does not exceed 90° C. The coating may be photocatalytic, photovoltaic, or piezoelectric. The coating, when moistened and exposed to ultraviolet light or sunlight, advantageously generates free radicals, which may be biocidal, deodorizing, or assist in degradation of surface deposits on the substrate after use. The substrate may be biological or organic, and may have a metallic or conductive intermediate layer.

First claim

What is claimed is:

1 . A formed polymeric object, comprising:
a substrate subject to degradation at temperatures above 100° C.; and a nanostructured ceramic coating having a thickness in excess of 100 nm, comprising at least one of titanium dioxide and zinc oxide, formed by deposition from a supersaturated aqueous solution of ceramic precursor on a surface of the substrate, wherein a process temperature for deposition of the nanostructured coating does not exceed 90° C.

2 . The formed polymeric object according to claim 1 , wherein the nanostructured ceramic coating comprises titanium oxide.

3 . The formed polymeric object according to claim 1 , wherein the nanostructured ceramic coating comprises zinc oxide.

4 . The formed polymeric object according to claim 1 , wherein the nanostructured ceramic coating comprises a photocatalytic coating.

5 . The formed polymeric object according to claim 1 , wherein the nanostructured ceramic coating comprises at least one of a photovoltaic coating and a piezoelectric coating.

6 . The formed polymeric object according to claim 1 , wherein the substrate comprises a material selected from the group consisting of: wood, wood composite materials, paper, cardboard, bamboo, cotton, linen, hemp, and jute.

7 . The formed polymeric object according to claim 1 , wherein the substrate comprises collagen.

8 . The formed polymeric object according to claim 1 , wherein the substrate comprises at least one material selected from the group consisting of: silk, polyester, acetate, acrylic (acrylonitrile), polyurethane, viscose, cellulose acetate, olefin, Kevlar, polybenzimidazole, orlon, vectran, polylactic acid, nylon, latex, rayon, spandex, viscose, polypropylene, fiberglass, carbon, polyvinyl chloride, polytetrafluoroethylene (PTFE), ultra high molecular weight polyethylene, high molecular weight polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, ultra low density polyethylene, urea-formaldehyde, reconstituted cellulose fiber, Polyethylene terephthalate (PET); Polyvinyl chloride (PVC); Polyvinylidene chloride (PVDC); Polyvinylidene fluoride (PVDF) Polypropylene (PP); Polystyrene (PS); High impact polystyrene (HIPS); Polyamides (PA), nylon; Acrylonitrile butadiene styrene (ABS); Polyethylene/Acrylonitrile Butadiene Styrene (PE/ABS); Polycarbonate (PC); Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS); Polyurethane (PU); Maleimide/Bismaleimide; Melamine formaldehyde (MF); Plastarch material; Phenolic (PF); Polyepoxide (Epoxy); Polyetheretherketone (PEEK); Polyetherimide (PEI); Polyimide; Polylactic acid (PLA); Polymethyl methacrylate (PMMA); Urea-formaldehyde (UF); Furan; Silicone; Epoxide, Polyaramide, Polysulfone, neoprene and butadiene rubber.

9 . The formed polymeric object according to claim 1 , wherein the substrate comprises at least one silicone material.

10 . The formed polymeric object according to claim 1 , wherein the substrate is subject to degradation by a photocatalytic process of the nanostructured ceramic coating interacting with ultraviolet light and water.

11 . The formed polymeric object according to claim 1 , wherein the object has a configuration of at least one of silverware, a serving utensil, a plate, a bowl, a cup, a tray, a cutting board, a toothbrush, a hair brush, and a comb.

12 . The formed polymeric object according to claim 1 , wherein the object comprises at least one of photocatalytic drapes, curtains or blinds.

13 . The formed polymeric object according to claim 1 , wherein the object has a configuration of at least one of medical catheter, an intravenous line, a transcutaneous medical device, a surgical device, and a medical scope.

14 . The formed polymeric object according to claim 1 , wherein the substrate comprises a polymeric substrate, having a metalized coating between the polymeric substrate and the nanostructured ceramic coating.

15 . The formed polymeric object according to claim 14 , wherein the nanostructured ceramic coating is deposited electrochemically.

16 . The formed polymeric object according to claim 1 , wherein the nanostructured ceramic coating is deposited in a hydrothermal deposition process.

17 . The formed polymeric object according to claim 1 , wherein the substrate comprises a molded thermoplastic resin.

18 . A photocatalytic water treatment system, comprising:
at least one surface configured to be wet with water and to be exposed to ultraviolet light, the surface being coated with a nanostructured ceramic coating having a thickness in excess of 100 nm, formed by a deposition of at least one of titanium dioxide and zinc oxide nanostructures from a supersaturated aqueous ceramic precursor solution in a deposition process which does not require the at least one surface to be heated above 100° C.; and an illumination system configured to illuminate the surface with ultraviolet light of sufficient intensity to treat water in the water flow path.

19 . The photocatalytic water treatment system according to claim 18 , wherein the surface comprises an exposed wetted surface of a clothes washer isolated from contact with clothes, the illumination system further comprising a source of UV light configured to supply UV light during operation of the clothes washer to the exposed wetted surface.

20 . The photocatalytic water treatment system according to claim 18 , wherein the surface comprises an interior surface of a refrigerator, the illumination system further comprising a source of UV light configured to supply UV light during operation of the refrigerator to the interior surface and a source of moisture to wet the interior surface.

21 . The photocatalytic water treatment system according to claim 20 , further comprising an odor detection sensor, and a control to control at least the UV light in dependence on an output of the sensor.

22 . A biocidal device, comprising at least one surface configured to retain natural rainwater and be exposed to sunlight, the at least one surface being coated with a nanostructured ceramic coating having a thickness in excess of 100 nm, formed by a deposition of at least one of titanium dioxide and zinc oxide nanostructures from a supersaturated aqueous ceramic precursor solution in a deposition process which does not require the at least one surface to be heated above 100° C.,
wherein the biocidal device produces larvicidal reaction products of rainwater when exposed to the sunlight.

Assignees

• Univ New York State Res Found

Inventors

• Cho Junghyun

Classifications

• A61L2300/404

  Biocides, antimicrobial agents, antiseptic agents · CPC title

• C02F2305/08

  Nanoparticles or nanotubes · CPC title

• Y10T442/2525

  Coating or impregnation functions biologically [e.g., insect repellent, antiseptic, insecticide, bactericide, etc.] · CPC title

• A61L31/088 Primary

  Other specific inorganic materials not covered by A61L31/084 or A61L31/086 · CPC title

• C02F2303/02

  Odour removal or prevention of malodour · CPC title