A microporous substance that expands under external hydrostatic pressure is unexpected. Even more surprising is one that can retain its expanded volume after release of the pressure. A zeolite has been found to do just that.
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Kenneth Snelson Needle Tower, 1968 Aluminum & Stainless Steel 18.2 m × 6 m × 6 m Collection: Hirshhorn Museum & Sculpture Garden,Washington, DC Photos: Kenneth Snelson
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Snelson, K. http://www.kennethsnelson.net
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Baur, W. Frameworks under pressure. Nature Mater 2, 17–18 (2003). https://doi.org/10.1038/nmat805
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DOI: https://doi.org/10.1038/nmat805