Superhydrophilic coatings

Patent metadata

Field	Value
Publication number	US-10036833-B2
Application number	US-95691310-A
Country	US
Kind code	B2
Filing date	Nov 30, 2010
Priority date	Aug 9, 2006
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A superhydrophilic coating on a substrate can be antireflective and antifogging. The coating can remain antireflective and antifogging for extended periods. The coating can include oppositely charge inorganic nanoparticles, and can be substantially free of an organic polymer. The coating can be made mechanically robust by a hydrothermal calcination.

First claim

What is claimed is:

1. An article comprising a surface comprising:
a planar substrate; and
a hydrothermally calcinated inorganic nanoparticle multilayer coating including;
a first layer including a first plurality of inorganic nanoparticles having a first electrostatic charge in contact with the substrate; and
a second layer including an oppositely charged second plurality of inorganic nanoparticles in contact with the first plurality of inorganic nanoparticles;

wherein the first plurality of inorganic nanoparticles and the second plurality of nanoparticles are fused to each other in the presence of a calcination reagent selected to promote fusing of the first plurality of nanoparticles and the second plurality of nanoparticles,
wherein the multilayer coating includes only neutrally-charged nanoparticles and free of polyelectrolyte polymers,
wherein the multilayer coating is adhered to the substrate.

2. The article of claim 1 , wherein the surface is antireflective.

3. The article of claim 1 , wherein the surface is antifogging.

Assignees

• Gemici Zekeriyya
• Rubner Michael F
• Cohen Robert E
• Massachusetts Inst Technology

Inventors

• Gemici Zekeriyya
• Rubner Michael F
• Cohen Robert E

Classifications

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• G02B27/0006

  with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B) · CPC title

• C03C17/006

  with materials of composite character · CPC title