Hostname: page-component-6bf8c574d5-gr6zb Total loading time: 0 Render date: 2025-02-18T06:55:23.969Z Has data issue: false hasContentIssue false
  • English
  • Français

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 [email protected]
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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Pekala, R. W. and Kong, F. M., Rev. Phys. Appl. 24 [4], C4–33 (1989).Google Scholar
[2] Schaefer, D. W., Pekala, R., and Beaucage, G., J. Non-Cryst. Solids 186, 159 (1995).Google Scholar
[3] Ruben, G. C., Pekala, R. W., Tillotson, T. M., and Hrubesh, L. W., J. Mater. Sci. 27, 4341 (1992).Google Scholar
[4] Katz, A. J. and Thompson, A. H., Phys. Rev. B, 34 [11,8179 (1986).Google Scholar
[5] Seaton, N. A., Chem. Eng. Sci. 46 [8], 1895 (1991); H. Liu, L. Zhang, and N. A. Seaton, Chem. Eng. Sci. 47 [17/18], 4393 (1992).Google Scholar
[6] Scherer, G. W., Smith, D. M., and Stein, D., J. Non-Cryst. Solids 186, 309 (1995).Google Scholar
[7] Scherer, G. W. and Smith, D. M., J. Non-Cryst. Solids 189, 197 (1995).Google Scholar
[9] Wu, S., Ellerby, L. M., Cohan, J. S., Dunn, B., El-Sayed, M. A., Valentine, J. Selverstone, and Zink, J. I., Chem. Mater. 5, 115 (1993).Google Scholar
[8] Braun, S., Shtelzer, S., Rappoport, S., Avnir, D., and Ottolenghi, M., J. Non-Cryst. Solids 147&148, 739 (1992).Google Scholar
[10] Scherer, G. W. in Drying '92 Part A, ed. Mujumdar, A. S. (Elsevier, Amsterdam, 1992), p. 92–113 Google Scholar
[11] Scherer, G. W., J. Non-Cryst. Solids 145, 33 (1992).Google Scholar
[12] Scherer, G. W., J. Sol-Gel Sci. Tech. 3, 127 (1994); T. Woignier, G. W. Scherer, and A. Alaoui, J. Sol-Gel Sci. Tech. 3, 141 (1994).Google Scholar
[13] Pekala, R. W., J. Mater. Sci., 24, 3221 (1989).Google Scholar
[14] Scherer, G. W., J. Non-Cryst. Solids, 142 [1–2], 18 (1992).Google Scholar
[15] Scherer, G. W., J. Sol-Gel Sci. Tech. 1, 169 (1994).Google Scholar
[16] Scherer, G. W., “Bending of gel beams: Effect of deflection rate and Hertzian indentation”, J. Non-Cryst. Solids, in press.Google Scholar
[17] Scherer, G. W., J. Sol-Gel Sci. Tech. 2 [1/2/3], 199 (1994).Google Scholar
[18] Scherer, G. W. in Better Ceramics Through Chemistry VI eds. Cheetham, A. K., Brinker, C. J., Mecartney, M. L., and Sanchez, C. (Mat. Res. Soc., Pittsburgh, PA, 1994), p. 209–215.Google Scholar
[19] Gross, J., Scherer, G. W., Alviso, C., and Pekala, R., “Elastic properties of crosslinked resorcinol-formaldehyde gels and aerogels”, submitted to J. Non-Cryst. Solids.Google Scholar
[20] Happel, J. and Brenner, H., Low Reynolds number hydrodynamics (Martinus Nijhoff, Dordrecht, 1986) p. 393–395.Google Scholar
[21] Scherer, G. W., J. Sol-Gel Sci. Tech. 1, 285 (1994).Google Scholar
[22] Reed, J. S., J. Am. Ceram. Soc. 76 [2], 547 (1993).Google Scholar
[23] Kong, F.-M., LeMay, J. D., Hulsey, S. S., Alviso, C. T., and Pekala, R. W., J. Mater. Res. 8, 3100 (1993).Google Scholar
[24] Reichenauer, G., Stumpf, C., and Fricke, J., J. Non-Cryst. Solids 186, 334 (1995).Google Scholar
[25] Lowell, S. and Shields, J. E., Powder surface Area and Porosity, (Chapman and Hall, New York, 1984) p. 61–63.Google Scholar
[26] Smith, D. M., Scherer, G. W., and Anderson, J. M., J. Non-Cryst. Solids 188, 191 (1995).Google Scholar