Organic aerogel microspheres

• US 5,908,896 A
• Filed: 01/16/1996
• Issued: 06/01/1999
• Est. Priority Date: 07/08/1993
• Status: Expired due to Term

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Kong, Fung-Ming, Pekala, Richard W., Mayer, Steven T., Kaschmitter, James L.
• Primary Examiner(s): McCamish, Marion
• Assistant Examiner(s): Guarriello, John J.
• Application Number:
  US08/586,038
• Time in Patent Office: 1,232 Days
• Field of Search: 524/596, 513/336, 513/337, 513/339, 521/181, 428/402, 502/418
• US Class Current: 524/596
• CPC Class Codes: B01J 13/00 Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
• CPC Class Codes: B01J 13/0091 Preparation of aerogels, e.g. xerogels
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/42 Powders or particles, e.g. composition thereof
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]

Abstract

Organic aerogel microspheres which can be used in capacitors, batteries, thermal insulation, adsorption/filtration media, and chromatographic packings, having diameters ranging from about 1 micron to about 3 mm. The microspheres can be pyrolyzed to form carbon aerogel microspheres. This method involves stirring the aqueous organic phase in mineral oil at elevated temperature until the dispersed organic phase polymerizes and forms nonsticky gel spheres. The size of the microspheres depends on the collision rate of the liquid droplets and the reaction rate of the monomers from which the aqueous solution is formed. The collision rate is governed by the volume ratio of the aqueous solution to the mineral oil and the shear rate, while the reaction rate is governed by the chemical formulation and the curing temperature.

Claims

1. An organic aerogel microsphere having a density in the range of about 0.05-1.2 g/cc, a diameter in the range from about 1 μ

to about 3 mm, and an R/C ratio of about 50-400.

2. The microsphere of claim 1, additionally including a dopant selected from the group of lithium and phosphorous.

3. The microsphere of claim 1, additionally including a dopant selected from the group of boron, arsenic and aluminum.

4. The microspheres of claim 1, additionally including a dopant.

5. A carbon aerogel microsphere having a density in the range of about 0.05-1.2 g/cc, a diameter in the range from about 1 μ

to about 3 mm, formed by pyrolyzing an organic aerogel microsphere having an R/C ratio of about 50-400 in either an inert or oxidizing atmosphere at a temperature range of about 500-3000°

C.

6. Organic aerogel microspheres having a density in the range of about 0.05-1.2 g/cc, and a diameter in the range of about 1 μ

to about 3 mm.

7. The organic aerogel microspheres of claim 6, additionally including a dopant.

8. The organic aerogel microspheres of claim 6 additionally including a dopant selected from the group consisting of lithium and phosphorous.

9. The organic aerogel microspheres of claim 6 additionally including a dopant selected from the group consisting of boron, arsenic, and aluminum.

10. Carbon aerogel microspheres having a density in the range of about 0.05-1.2 g/cc, and a diameter in the range of about 1 μ

to about 3 mm, produced by pyrolyzing organic aerogel microspheres.

11. Carbon aerogel microspheres having a density in the range of about 0.05-1.2 g/cc, and a diameter in the range of about 1 μ

to about 3 mm, produced by pyrolyzing organic aerogel microspheres in an inert or oxidizing atmosphere.

12. Organic aerogel microspheres.

13. Carbon aerogel microspheres formed by pyrolyzing organic aerogel microspheres.