Title: Low density, resorcinol-formaldehyde aerogels

Abstract

The polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer ''clusters''. The covalent crosslinking of these ''clusters'' produces gels which when processed under supercritical conditions, produce low density, organic aerogels (density less than or equal to100 mg/cc; cell size less than or equal to0.1 microns). The aerogels are transparent,dark red in color and consist of interconnected colloidal-like particles with diameters of about 100 A/degree/. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron. 1 fig., 1 tab.

Inventors:

Pekala, R. W.

Issue Date:

1988-05-26

Research Org.:

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:

6291725

Patent Number(s):

7199404

Application Number:

ON: DE89009650

Assignee:

Dept. of Energy

Patent Classifications (CPCs):

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

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H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES

H01L29/0834 - {Anode regions of thyristors or gated bipolar-mode devices, e.g. supplementary regions surrounding anode regions}
H01L29/0878 - {Impurity concentration or distribution}
H01L29/0696 - {of cellular field-effect devices, e.g. multicellular DMOS transistors or IGBTs}
H01L29/0847 - {of field-effect transistors with insulated gate
H01L29/7813 - {with trench gate electrode, e.g. UMOS transistors
H01L29/7397 - {and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT}
H01L29/7802 - {Vertical DMOS transistors, i.e. VDMOS transistors}

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DOE Contract Number:  

W-7405-ENG-48

Resource Type:

Patent

Resource Relation:

Other Information: Portions of this document are illegible in microfiche products

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; FORMALDEHYDE; SYNTHESIS; GELS; RESORCINOL; CROSS-LINKING; DENSITY; FOAMS; INVENTIONS; MECHANICAL PROPERTIES; POROSITY; SODIUM CARBONATES; SOL-GEL PROCESS; ALDEHYDES; ALKALI METAL COMPOUNDS; AROMATICS; CARBON COMPOUNDS; CARBONATES; CHEMICAL REACTIONS; COLLOIDS; DEVELOPERS; DISPERSIONS; HYDROXY COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PHENOLS; PHYSICAL PROPERTIES; POLYMERIZATION; POLYPHENOLS; SODIUM COMPOUNDS; 360601* - Other Materials- Preparation & Manufacture