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Science 27 January 2006:
Vol. 311. no. 5760, p. 432
DOI: 10.1126/science.311.5760.432a
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This Week in Science

Figure 1 When water freezes, it can form hexagonal plates that grow at different rates in different directions, and impurities can become trapped at the water-ice interfaces. Deville et al. (p. 515; see the Perspective by Halloran) exploited these effects to fabricate porous materials from concentrated ceramic powder suspensions, which could also be backfilled with a second material to make composites. The colloidal particles could then be etched away to leave a porous structure composed of the second material such as alumina. Using nacre and bone as their inspirations, the authors show how they can replicate these complex composite materials.

CREDIT: DEVILLE ET AL./MATERIAL SCIENCES DIVISION, LBNL




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