US2007104922A1PendingUtilityA1

Superhydrophilic coatings

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Assignee: ZHAI LEIPriority: Nov 8, 2005Filed: Nov 8, 2005Published: May 10, 2007
Est. expiryNov 8, 2025(expired)· nominal 20-yr term from priority
Inventors:Lei ZhaiFevzi Cakmak CebeciRobert E. CohenMichael Rubner
C09D 139/00B05D 5/06Y10T428/24942Y10T428/25B05D 5/04B05D 1/18C03C 2217/425C03C 2217/75C03C 2217/42C03C 17/3405C08L 33/02Y10T428/24372C03C 2217/478Y10T428/24355
47
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Claims

Abstract

A superhydrophilic coating can be antireflective and antifogging. The coating can remain antireflective and antifogging for extended periods.

Claims

exact text as granted — not AI-modified
1 . A superhydrophilic surface comprising a nanotextured coating including a hydrophilic material arranged on a substrate.  
     
     
         2 . The surface of  claim 1 , wherein the substrate is substantially transparent.  
     
     
         3 . The surface of  claim 2 , wherein the surface is substantially transparent.  
     
     
         4 . The surface of  claim 3 , wherein the surface has a refractive index of less than 1.4.  
     
     
         5 . The surface of  claim 4 , wherein the surface has a refractive index of less than 1.3.  
     
     
         6 . The surface of  claim 3 , wherein the coating has a thickness of less than 500 nm.  
     
     
         7 . The surface of  claim 3 , wherein the coating has a thickness of less than 300 nm.  
     
     
         8 . The surface of  claim 3 , wherein the surface has an rms roughness in the range of 10-20 nm.  
     
     
         9 . The surface of  claim 3 , wherein the surface has an rms roughness in the range of 12-16 nm.  
     
     
         10 . The surface of  claim 1 , wherein the coating includes a plurality of nanoparticles.  
     
     
         11 . The surface of  claim 10 , wherein the plurality of nanoparticles includes a silica nanoparticle.  
     
     
         12 . The surface of  claim 10 , wherein the plurality of nanoparticles includes a nanoparticle having a diameter in the range of 5 nm to 100 nm.  
     
     
         13 . The surface of  claim 10 , wherein the plurality of nanoparticles includes a nanoparticle having a diameter in the range of 5 nm to 25 nm.  
     
     
         14 . The surface of  claim 10 , wherein the coating is substantially free of organic polymer.  
     
     
         15 . The surface of  claim 10 , wherein the coating includes a polyelectrolyte.  
     
     
         16 . The surface of  claim 15 , wherein the polyelectrolyte includes a polycation.  
     
     
         17 . The surface of  claim 15 , wherein the polyelectrolyte includes poly(allylamine hydrochloride).  
     
     
         18 . The surface of  claim 15 , wherein the coating further comprises a bilayer, the bilayer including a polyelectrolyte having a charge and a material having an opposite charge.  
     
     
         19 . The surface of  claim 18 , wherein the material having the opposite charge is a polyelectrolyte.  
     
     
         20 . The surface of  claim 18 , wherein the material having the opposite charge is a plurality of nanoparticles.  
     
     
         21 . A method of treating a surface comprising: 
 forming a coating on a surface of a substrate, wherein the coating includes a bilayer including a polyelectrolyte having a charge and a second material having an opposite charge.    
     
     
         22 . The method of  claim 21 , wherein the second material is hydrophilic.  
     
     
         23 . The method of  claim 21 , wherein the second material includes a polyelectrolyte.  
     
     
         24 . The method of  claim 21 , wherein the second material includes a nonpolymeric material.  
     
     
         25 . The method of  claim 21 , wherein the second material includes a plurality of nanoparticles.  
     
     
         26 . The method of  claim 21 , further comprising sequentially forming a plurality of bilayers, wherein each bilayer includes a polyelectrolyte having a charge and a second material having an opposite charge.  
     
     
         27 . The method of  claim 26 , wherein at least one bilayer includes a polyelectrolyte.  
     
     
         28 . The method of  claim 26 , wherein at least one bilayer includes a nonpolymeric material.  
     
     
         29 . The method of  claim 26 , wherein at least one bilayer includes a plurality of nanoparticles.  
     
     
         30 . The method of  claim 21 , wherein forming the bilayer includes contacting the surface of the substrate with an aqueous solution of the polyelectrolyte.  
     
     
         31 . The method of  claim 21 , wherein forming the bilayer includes contacting the surface of the substrate with an aqueous solution of the second material.  
     
     
         32 . The method of  claim 21 , further comprising heating the coating.  
     
     
         33 . The method of  claim 21 , further comprising contacting the coating with a plasma.  
     
     
         34 . A method of manufacturing an antifogging surface comprising forming a nanotextured layer including a hydrophilic material arranged on a surface of a substrate.  
     
     
         35 . An article comprising a surface having an antireflective coating including a nanotextured hydrophilic material.  
     
     
         36 . An article comprising a surface having an antifogging coating including a nanotextured hydrophilic material.

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