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Title: Antireflective graded index silica coating, method for making

Abstract

Antireflective silica coating for vitreous material is substantially non-reflecting over a wide band of radiations. This is achieved by providing the coating with a graded degree of porosity which grades the index of refraction between that of air and the vitreous material of the substrate. To prepare the coating, there is first prepared a silicon-alkoxide-based coating solution of particular polymer structure produced by a controlled proportion of water to alkoxide and a controlled concentration of alkoxide to solution, along with a small amount of catalyst. The primary solvent is alcohol and the solution is polymerized and hydrolized under controlled conditions prior to use. The prepared solution is applied as a film to the vitreous substrate and rapidly dried. It is thereafter heated under controlled conditions to volatilize the hydroxyl radicals and organics therefrom and then to produce a suitable pore morphology in the residual porous silica layer. The silica layer is then etched in order to enlarge the pores in a graded fashion, with the largest of the pores remaining being sufficiently small that radiations to be passed through the substrate are not significantly scattered. For use with quartz substrates, extremely durable coatings which display only 0.1% reflectivity have beenmore » prepared.« less

Inventors:
 [1];  [2]
  1. (Churchill, PA)
  2. (Wilkinsburg, PA)
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
865551
Patent Number(s):
4535026
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
antireflective; graded; index; silica; coating; method; vitreous; material; substantially; non-reflecting; wide; band; radiations; achieved; providing; degree; porosity; grades; refraction; air; substrate; prepare; prepared; silicon-alkoxide-based; solution; particular; polymer; structure; produced; controlled; proportion; water; alkoxide; concentration; amount; catalyst; primary; solvent; alcohol; polymerized; hydrolized; conditions; prior; applied; film; rapidly; dried; thereafter; heated; volatilize; hydroxyl; radicals; organics; therefrom; produce; suitable; pore; morphology; residual; porous; layer; etched; enlarge; pores; fashion; largest; remaining; sufficiently; passed; significantly; scattered; quartz; substrates; extremely; durable; coatings; display; reflectivity; wide band; porous silica; controlled conditions; thereafter heated; silica coating; graded index; durable coatings; hydroxyl radicals; polymer structure; /428/216/359/427/

Citation Formats

Yoldas, Bulent E., and Partlow, Deborah P. Antireflective graded index silica coating, method for making. United States: N. p., 1985. Web.
Yoldas, Bulent E., & Partlow, Deborah P. Antireflective graded index silica coating, method for making. United States.
Yoldas, Bulent E., and Partlow, Deborah P. Tue . "Antireflective graded index silica coating, method for making". United States. https://www.osti.gov/servlets/purl/865551.
@article{osti_865551,
title = {Antireflective graded index silica coating, method for making},
author = {Yoldas, Bulent E. and Partlow, Deborah P.},
abstractNote = {Antireflective silica coating for vitreous material is substantially non-reflecting over a wide band of radiations. This is achieved by providing the coating with a graded degree of porosity which grades the index of refraction between that of air and the vitreous material of the substrate. To prepare the coating, there is first prepared a silicon-alkoxide-based coating solution of particular polymer structure produced by a controlled proportion of water to alkoxide and a controlled concentration of alkoxide to solution, along with a small amount of catalyst. The primary solvent is alcohol and the solution is polymerized and hydrolized under controlled conditions prior to use. The prepared solution is applied as a film to the vitreous substrate and rapidly dried. It is thereafter heated under controlled conditions to volatilize the hydroxyl radicals and organics therefrom and then to produce a suitable pore morphology in the residual porous silica layer. The silica layer is then etched in order to enlarge the pores in a graded fashion, with the largest of the pores remaining being sufficiently small that radiations to be passed through the substrate are not significantly scattered. For use with quartz substrates, extremely durable coatings which display only 0.1% reflectivity have been prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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