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Science 19 November 1999:
Vol. 286. no. 5444, pp. 1540 - 1543
DOI: 10.1126/science.286.5444.1540
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Reports

The Gelation of CO2: A Sustainable Route to the Creation of Microcellular Materials

C. Shi, 1 Z. Huang, 1 S. Kilic, 1 J. Xu, 1 R. M. Enick, 1 E. J. Beckman, 1* A. J. Carr, 2 R. E. Melendez, 2 A. D. Hamilton 2*

Compounds with strong thermodynamic affinity for carbon dioxide (CO2) have been designed and synthesized that dissolve in CO2, then associate to form gels. Upon removal of the CO2, these gels produced free-standing foams with cells with an average diameter smaller than 1 micrometer and a bulk density reduction of 97 percent relative to the parent material.

1 Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.
2 Department of Chemistry, Yale University, New Haven, CT 06520, USA.
*   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Solid-state Processing of Polymer in the Presence of Supercritical Carbon Dioxide.
X. Hu and A. J. Lessery (2006)
Journal of Cellular Plastics 42, 517-527
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Science. ISSN 0036-8075 (print), 1095-9203 (online)