Gas permeability of carbon aerogels

• 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
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/JMR.1993.3100

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.