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Mesoporous-silica films, fibers, and powders by evaporation

Patent ·
OSTI ID:872382
 [1];  [1];  [2];  [3]
  1. Kennewick, WA
  2. Richland, WA
  3. West Richland, WA
+ Show Author Affiliations

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).

Research Organization:
BATTELLE MEMORIAL INSTITUTE
DOE Contract Number:
AC06-76RL01830
Assignee:
Battelle Memorial Institute (Richland, WA)
Patent Number(s):
US 5922299
OSTI ID:
872382
Country of Publication:
United States
Language:
English

References (5)

Free-standing and oriented mesoporous silica films grown at the air–water interface journal June 1996
Organization of Organic Molecules with Inorganic Molecular Species into Nanocomposite Biphase Arrays journal August 1994
A simple sol–gel route for the preparation of silica–surfactant mesostructured materials journal January 1996
Synthesis of oriented films of mesoporous silica on mica journal February 1996
Formation of Novel Oriented Transparent Films of Layered Silica-Surfactant Nanocomposites journal August 1994

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Related Subjects

/423/
accomplished
added
amount
casting
combinations
composed
conditions
drawing
drawn
drying
escapes
evaporated
evaporating
evaporation
example
exists
fast
fiber
fibers
film
films
followed
form
formation
formed
forming
geometric
geometrically
hollow
hollow sphere
hollow spheres
including
inner layer
layer
leaving
limited
liquid
material
mesoporous
mesoporous material
mesoporous-silica
method
method including
micro-bubbles
mixture
nanometer-scale
particles
pertains
pituitous
porosity
porous material
porous silica
powder
powder form
powder formation
powders
pre-polymer
precursor
precursor solution
preferably
preform
produced
product
production
quickly
rapid
ratio
removal
respectively
silica
silica precursor
similar
solution
solvent
spheres
spin
spin-casting
spinning
spray
spray drying
spraying
squeegeeing
starts
strand
surface
surface-area
surfactant-templated
thinner
thinning
via
volume
volume ratio
walls