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Title: Mesoporous-silica films, fibers, and powders by evaporation

Abstract

This invention pertains to surfactant-templated nanometer-scale porosity of a silica precursor solution and forming a mesoporous material by first forming the silica precursor solution into a preform having a high surface area to volume ratio, then rapid drying or evaporating a solvent from the silica precursor solution. The mesoporous material may be in any geometric form, but is preferably in the form of a film, fiber, powder or combinations thereof. The rapid drying or evaporation of solvent from the solution is accomplished by layer thinning, for example spin casting, liquid drawing, and liquid spraying respectively. Production of a film is by layer thinning, wherein a layer of the silica precursor solution is formed on a surface followed by removal of an amount of the silica precursor solution and leaving a geometrically thinner layer of the silica precursor solution from which the solvent quickly escapes via evaporation. Layer thinning may be by any method including but not limited to squeegeeing and/or spin casting. In powder formation by spray drying, the same conditions of fast drying exists as in spin-casting (as well as in fiber spinning) because of the high surface-area to volume ratio of the product. When a powder is producedmore » by liquid spraying, the particles or micro-bubbles within the powder are hollow spheres with walls composed of mesoporous silica. Mesoporous fiber formation starts with a similar silica precursor solution but with an added pre-polymer making a pituitous mixture that is drawn into a thin strand from which solvent is evaporated leaving the mesoporous fiber(s).« less

Inventors:
; ; ;
Issue Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176708
Patent Number(s):
RE40299
Application Number:
09/481,988
Assignee:
Battelle Memorial Institute (Richland, WA)
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Bruinsma, Paul J., Baskaran, Suresh, Bontha, Jagannadha R., and Liu, Jun. Mesoporous-silica films, fibers, and powders by evaporation. United States: N. p., 2008. Web.
Bruinsma, Paul J., Baskaran, Suresh, Bontha, Jagannadha R., & Liu, Jun. Mesoporous-silica films, fibers, and powders by evaporation. United States.
Bruinsma, Paul J., Baskaran, Suresh, Bontha, Jagannadha R., and Liu, Jun. Tue . "Mesoporous-silica films, fibers, and powders by evaporation". United States. https://www.osti.gov/servlets/purl/1176708.
@article{osti_1176708,
title = {Mesoporous-silica films, fibers, and powders by evaporation},
author = {Bruinsma, Paul J. and Baskaran, Suresh and Bontha, Jagannadha R. and Liu, Jun},
abstractNote = {This invention pertains to surfactant-templated nanometer-scale porosity of a silica precursor solution and forming a mesoporous material by first forming the silica precursor solution into a preform having a high surface area to volume ratio, then rapid drying or evaporating a solvent from the silica precursor solution. The mesoporous material may be in any geometric form, but is preferably in the form of a film, fiber, powder or combinations thereof. The rapid drying or evaporation of solvent from the solution is accomplished by layer thinning, for example spin casting, liquid drawing, and liquid spraying respectively. Production of a film is by layer thinning, wherein a layer of the silica precursor solution is formed on a surface followed by removal of an amount of the silica precursor solution and leaving a geometrically thinner layer of the silica precursor solution from which the solvent quickly escapes via evaporation. Layer thinning may be by any method including but not limited to squeegeeing and/or spin casting. In powder formation by spray drying, the same conditions of fast drying exists as in spin-casting (as well as in fiber spinning) because of the high surface-area to volume ratio of the product. When a powder is produced by liquid spraying, the particles or micro-bubbles within the powder are hollow spheres with walls composed of mesoporous silica. Mesoporous fiber formation starts with a similar silica precursor solution but with an added pre-polymer making a pituitous mixture that is drawn into a thin strand from which solvent is evaporated leaving the mesoporous fiber(s).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {5}
}

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Works referenced in this record:

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journal, March 1996


Templating of Mesoporous Molecular Sieves by Nonionic Polyethylene Oxide Surfactants
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Organization of Organic Molecules with Inorganic Molecular Species into Nanocomposite Biphase Arrays
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Formation of a Porous Zirconium Oxo Phosphate with a High Surface Area by a Surfactant-Assisted Synthesis
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Synthesis and Characterization of Hexagonally Packed Mesoporous Tantalum Oxide Molecular Sieves
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Synthesis of oriented films of mesoporous silica on mica
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Free-standing and oriented mesoporous silica films grown at the air–water interface
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