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Permeability and Structure of Resorcinol – Formaldehyde Gels

Published online by Cambridge University Press:  10 February 2011

G. W. Scherer ,
C. Alviso ,
R. Pekala  and
J. Gross
G. W. Scherer
Affiliation:
Dept. CEOR, Princeton University, Eng. Quad. E-319, Princeton, NJ 08544 USAscherer@princeton.edu
C. Alviso
Affiliation:
Lawrence Livermore National Lab., P.O. Box 808 L-322, Livermore CA 94550 USA
R. Pekala
Affiliation:
Lawrence Livermore National Lab., P.O. Box 808 L-322, Livermore CA 94550 USA
J. Gross
Affiliation:
Lawrence Livermore National Lab., P.O. Box 808 L-322, Livermore CA 94550 USA
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Abstract

The permeability (D) of resorcinol-formaldehyde (RF) gels was measured using a beam-bending technique. For gels made at various solids contents and with different catalyst contents, the permeabilities ranged over a factor of ∼50; the pore radii inferred from D varied from ∼3 to 30 nm. Pore radii obtained on RF aerogels using nitrogen desorption were severely affected by compression of the aerogel by capillary forces (resulting from the surface tension of liquid nitrogen). After correction for that effect, the desorption data were found to be in very good agreement with the pore sizes calculated from D.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 497
Copyright
Copyright © Materials Research Society 1996

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