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High Resolution Tem of Organic Aerogels and Inorganic Aerogels

Published online by Cambridge University Press:  28 February 2011

George C. Ruben  and
Richard W. Pekala
George C. Ruben
Affiliation:
Department of Biological Sciences, Dartmouth College, Hanover, NH 03755
Richard W. Pekala
Affiliation:
Department of Biological Sciences, Dartmouth College, Hanover, NH 03755 Chemistry & Materials Science Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

A base catalyzed silica aerogel and three base catalyzed resorcinol-formaldehyde (RF) aerogels were imaged with a new vertical platinum-carbon (Pt-C) replication technique. In deep gels single molecular chains can be visualized with transmission electron microscopy (TEM) with 9–10 Å thick Pt-C replicas backed with 110–130 Å of carbon [2]. The three RF aerogels produced with [Resorcinol]/[Catalyst] ratios (R/C) of 50, 200, and 300 had densities of 0.103, 0.063, and 0.065 gm/cc and had surface areas of 905, 580, and 390 m2/gm, respectively. The gel connectors and junctions in RF 300 and RF 200 were composed of 210±30 Å and 140±10 Å beads which were joined by polymeric chains covering an area less than half the bead's diameter and within a bead diameter's distance. The gel connectors and junctions in RF 50 were frequently composed of beads of about 120±10 Å joined over an area larger than half the bead's diameter. Similar to the silica aerogel (0.065 gm/cc, 113±10 Å beads), the beads were frequently connected over several bead diameter's distance from each other.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 785
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Pekala, R.W., J. Mater. Sci. 24 (9), 3221 (1989).Google Scholar
2. Ruben, G.C., J. Elect. Microsc. Tech., 13, 335 (1989).Google Scholar
3. Ruben, G.C. and Shafer, M.W. in Better Ceramics Through Chemistry II, edited by Brinker, C.J., Clark, D.E., and Ulrich, D.R. (Mater. Res. Soc. Proc. 73, Pittsburgh, PA 1986) pp. 207–212.Google Scholar
4. Shafer, M.W., Awschalom, D.D., Warnock, J. and Ruben, G.C., J. Appl. Phys., 61, 5438 (1987).Google Scholar