US4849378A
Expired / Lapsed
US
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Ultraporous gel monoliths having predetermined pore sizes and their production
Assignee: GRYPHON VENTURES II LP
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Filing: 1985-02-25
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Granted: 1989-07-18
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Expires: 2005-02-25
Abstract
Abstract A method of fabricating an ultraporous SiO 2 containing gel monoliths having a predetermined mean pore size with narrow distribution of the size of the pores around the mean. A SiO 2 containing sol is prepared while simultaneously controlling and preselecting the temperature, time and nature of aging solution, and drying the resultant gel to obtain an ultraporous SiO 2 containing monolith having a predetermined mean pore size from about 10 Å to about 400 Å with narrow distribution of the size of pores around the mean and the resultant article.
Inventors
- 👤 Larry L. Hench
- 👤 Gerard F. Orcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
G; G06; G06N; G06N3/00; G06N3/002; B; B82; B82Y; B82Y10/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A method of fabricating an ultraporous, SiO 2 -containing, gel-derived monolith comprising the steps of hydrolyzing a SiO 2 precursor to form a sol; gelling the sol; aging the gelled sol; and drying the aged gelled sol; wherein the temperature of, the duration of, the solvent concentration used in and the additives used in the hydrolyzing, gelling, aging and drying steps are controlled and preselected to obtain an ultraporous, SiO 2 -containing monolith, having a pore volume of between about 0.2 and about 1.5 cm 3 /g and a predetermined mean pore size from about 10 Å to about 400 Å with narrow distribution of the size of pores around the mean.
Claim 2
Independent Claim
112 words
A method of fabricating an ultraporous, SiO 2 -containing, gel-derived monolith comprising the steps of hydrolyzing a SiO 2 precursor to form a sol; gelling the sol; aging the gelled sol; and drying the aged gelled sol; wherein the temperature of, the duration of, the solvent concentration used in and the additives used in the hydrolyzing, gelling, aging and drying steps are controlled and preselected to obtain an ultraporous, SiO 2 -containing monolith, having a pore volume of between about 0.2 and about 1.5 cm 3 /g and a predetermined mean pore size from about 10 Å to about 400 Å with narrow distribution of the size of pores around the mean.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein the sol also contains a constituent selected from the group consisting of Al 2 O 3 , TiO 2 , Li 2 O, Na 2 O, B 2 O 3 and mixtures thereof.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein aging occurs in a solution containing an electrolyte.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the electrolyte is NH 4 OH.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the sol contains a drying control chemical additive which is formamide.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the ultraporous gel-derived monolith is pure silica.
Claim 8
Dependent Claim
42 words
The method of claim 1 wherein the ultraporous gel-derived monolith is about 70 mole % SiO 2 , about 29 mole % Al 2 O 3 , about 6 mole % TiO 2 , and about 5 mole % Li 2 O.
Claim 9
Dependent Claim
9 words
A monolith made by the process of claim 7.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |