Gas permeability of carbon aerogels

Gas permeability of carbon aerogels

Carbon aerogels are synthesized via the aqueous polycondensation of resorcinol with formaldehyde, followed by supercritical drying and subsequent pyrolysis at 1050 °C. As a result of their interconnected porosity, ultrafine cell/pore size, and high surface area, carbon aerogels have many potential a...

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Bibliographic Details
Published in:Journal of materials research Vol. 8; no. 12; pp. 3100 - 3105
Main Authors: Kong, F-M., LeMay, J.D., Hulsey, S.S., Alviso, C.T., Pekala, R.W.
Format: Journal Article
Language:English
Published: New York, USA Cambridge University Press 01-12-1993
Materials Research Society
Subjects:
360606 - Other Materials- Physical Properties- (1992-)
CARBON
CHEMICAL REACTIONS
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
COLLOIDS
DECOMPOSITION
DENSITY
DISPERSIONS
ELEMENTS
EQUATIONS
Exact sciences and technology
FLUIDS
GASES
GELS
General and physical chemistry
HYDRAULIC CONDUCTIVITY
MATERIALS SCIENCE
NONMETALS
PERMEABILITY
PHYSICAL PROPERTIES
POROSITY
PYROLYSIS
SYNTHESIS
THERMOCHEMICAL PROCESSES
Pyrolysis
Solution polycondensation
Aerogel
Pore structure
Experimental study
Carbon
Formaldehyde
Resorcinol
Colloidal gel
Gas permeability
Pore size
Transmission electron microscopy
Preparation
Porosity
Aqueous solution
Application
Supercritical process
Drying
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Summary:Carbon aerogels are synthesized via the aqueous polycondensation of resorcinol with formaldehyde, followed by supercritical drying and subsequent pyrolysis at 1050 °C. As a result of their interconnected porosity, ultrafine cell/pore size, and high surface area, carbon aerogels have many potential applications such as supercapacitors, battery electrodes, catalyst supports, and gas filters. The performance of carbon aerogels in the latter two applications depends on the permeability or gas flow conductance in these materials. By measuring the pressure differential across a thin specimen and the nitrogen gas flow rate in the viscous regime, the permeability of carbon aerogels was calculated from equations based upon Darcy's law. Our measurements show that carbon aerogels have permeabilities on the order of 10−12 to 10−10 cm2 over the density range from 0.05–0.44 g/cm3. Like many other aerogel properties, the permeability of carbon aerogels follows a power law relationship with density, reflecting differences in the average mesopore size. Comparing the results from this study with the permeability of silica aerogels reported by other workers, we found that the permeability of aerogels is governed by a simple universal flow equation. This paper discusses the relationship among permeability, pore size, and density in carbon aerogels.
Bibliography:istex:D9D6270BB03D9B5E33318498842FF6D01E7DACCE
PII:S0884291400072368
ArticleID:07236
ark:/67375/6GQ-0NZKKGDZ-J
W-7405-ENG-48
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.1993.3100