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Science 19 November 1999:
Vol. 286. no. 5444, p. 1441
DOI: 10.1126/science.286.5444.1441c
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The formation of foams with both low density and small cell size has been difficult to achieve. Shi et al. (p. 1540) have developed families of surfactants with high affinity for liquid carbon dioxide that increased its viscosity substantially and formed a gel even at a few weight percent. When the CO2 was vented, low-density foams with submicrometer pores were formed. The use of CO2 as a "blowing agent" could replace less environmentally benign compounds.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)