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US5948482A
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Ambient pressure process for preparing aerogel thin films reliquified sols useful in preparing aerogel thin films
Assignee: National Technology and Engineering Solutions of Sandia LLC
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Filing: 1995-09-19
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Granted: 1999-09-07
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Expires: 2015-09-19
Abstract
Abstract A method for preparing aerogel thin films by an ambient-pressure, continuous process. The method of this invention obviates the use of an autoclave and is amenable to the formation of thin films by operations such as dip coating. The method is less energy intensive and less dangerous than conventional supercritical aerogel processing techniques.
Inventors
- 👤 Charles Jeffrey Brinker
- 👤 Sai Sivasankaran Prakash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:34
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585; C01B13/00; C01B13/14; C01B13/145; C01P; C01P2006/00; C01P2006/14; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A method for preparing a reliquified sol comprising the steps of: (a) forming a colloidal sol; (b) aging the sol to form a gel; (c) derivatizing the surface of the gel with non-hydrolyzable organic substituents in a non-aqueous medium; and (d) applying sonication to the derivatized gel in a non-aqueous medium to form a reliquified sol capable of being coated on a substrate to form a film requiring substantially no subsequent additional drying and having a porosity greater than about 50 volume %.
Claim 2
Independent Claim
83 words
A method for preparing a reliquified sol comprising the steps of: (a) forming a colloidal sol; (b) aging the sol to form a gel; (c) derivatizing the surface of the gel with non-hydrolyzable organic substituents in a non-aqueous medium; and (d) applying sonication to the derivatized gel in a non-aqueous medium to form a reliquified sol capable of being coated on a substrate to form a film requiring substantially no subsequent additional drying and having a porosity greater than about 50 volume %.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the colloidal sol comprises one or more metal oxide, metalloid oxide, hydroxide, alkoxide, oxohydroxide, or oxoalkoxide.
Claim 4
Dependent Claim
51 words
The method of claim 1 wherein the colloidal sol comprises at least one member selected from the group consisting of SiO 2 , B 2 O 3 , TiO 2 , Al 2 O 3 , ZrO 2 , Y 2 O 3 , and their hydrolyzed, alkoxylated, or akylated derivatives.
Claim 5
Dependent Claim
19 words
The method of claim 1 where the derivatizing agent is an alcohol amine, a β-diketonate, or a carboxylic acid.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein the colloidal sol is a metal, metal carbide, metal nitride, or metal chalcogenide.
Claim 7
Dependent Claim
30 words
The method according to claim 1, wherein the reliquified sol is capable of producing a film having a porosity of at least 80 volume % when coated on a substrate.
Claim 8
Dependent Claim
30 words
The method according to claim 1, wherein the reliquified sol is capable of producing a film having a porosity of at least 90 volume % when coated on a substrate.
Claim 9
Dependent Claim
10 words
A reliquified sol produced by the method of claim 1.
Claim 10
Dependent Claim
26 words
A reliquified sol according to claim 8 capable of producing a film having a porosity of at least 80 volume % when coated on a substrate.
Claim 11
Dependent Claim
26 words
A reliquified sol according to claim 8 capable of producing a film having a porosity of at least 90 volume % when coated on a substrate.
Claim 12
Dependent Claim
21 words
A reliquified sol according to claim 8 comprising one or more derivatized metal oxide, metalloid oxide, hydroxide, alkoxide, oxohydroxide, or oxoalkoxide.
Claim 13
Dependent Claim
50 words
A reliquified sol according to claim 8 comprising at least one member selected from the group consisting of derivatized SiO 2 , B 2 O 3 , TiO 2 , Al 2 O 3 , ZrO 2 , Y 2 O 3 , and their hydrolyzed, alkoxylated, or alkylated derivatives.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-06 | 2003-03-08 | 2003-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-06 | 2007-03-08 | 2007-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-06 | 2011-03-08 | 2011-09-07 | $7700.00 | Window Closed / Lapsed |