A fast supercritical extraction technique for aerogel fabrication

Gauthier, Ben M.; Bakrania, Smitesh; Anderson, Ann M.; Carroll, Mary K.

doi:10.1016/j.jnoncrysol.2004.06.044

Cited by 89 publications

(45 citation statements)

References 19 publications

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“…Rapid supercritical extraction (RSCE) is another method for SCD. It was developed by Poco et al (1996) and used by Scherer et al (2002) and Gauthier et al (2004). In this method, the liquid precursor chemicals and catalyst are inserted into a two-piece mold that is then heated rapidly to speed up the polymerization.…”

Section: High Temperature Supercritical Drying (Htscd)mentioning

confidence: 99%

Silica aerogel; synthesis, properties and characterization

Dorcheh

Abbasi

2008

Journal of Materials Processing Technology

1,079

335

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Section: High Temperature Supercritical Drying (Htscd)mentioning

confidence: 99%

Silica aerogel; synthesis, properties and characterization

Dorcheh

Abbasi

2008

Journal of Materials Processing Technology

1,079

335

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“…The Union College Rapid Supercritical Extraction (RSCE) process is a one-step (precursor to aerogel) method [17][18][19] . The method employs high-temperature supercritical extraction, which allows fabrication of monolithic aerogels in hours, rather than the days to weeks required by other methods.…”

Section: Si(och 3 ) 4 + H 2 Omentioning

confidence: 99%

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

Carroll

Anderson

Gorka

2014

JoVE

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A procedure for the fabrication of monolithic silica aerogels in eight hours or less via a rapid supercritical extraction process is described. The procedure requires 15-20 min of preparation time, during which a liquid precursor mixture is prepared and poured into wells of a metal mold that is placed between the platens of a hydraulic hot press, followed by several hours of processing within the hot press. The precursor solution consists of a 1.0:12.0:3.6:3.5 x 10 -3 molar ratio of tetramethylorthosilicate (TMOS):methanol:water:ammonia. In each well of the mold, a porous silica sol-gel matrix forms. As the temperature of the mold and its contents is increased, the pressure within the mold rises. After the temperature/ pressure conditions surpass the supercritical point for the solvent within the pores of the matrix (in this case, a methanol/water mixture), the supercritical fluid is released, and monolithic aerogel remains within the wells of the mold. With the mold used in this procedure, cylindrical monoliths of 2.2 cm diameter and 1.9 cm height are produced. Aerogels formed by this rapid method have comparable properties (low bulk and skeletal density, high surface area, mesoporous morphology) to those prepared by other methods that involve either additional reaction steps or solvent extractions (lengthier processes that generate more chemical waste).The rapid supercritical extraction method can also be applied to the fabrication of aerogels based on other precursor recipes. Video LinkThe video component of this article can be found at

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“…Conventionally, for the preparation of silica aerogels, silicon alkoxides such as tetramethoxysilane (TMOS), tetraethoxysilane (TEOS), trimethylmethoxysilane (TMMS) and methyltrimethoxysilane (MTMS), were used as precursors [14][15][16][17][18]. There are several reports on silica aerogels based on various precursors mentioned 0925-8388/$ -see front matter © 2007 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%