Negative Poisson's ratios in siliceous zeolite MFI-silicalite.
- Sanchez-Valle C Institute for Mineralogy and Petrology, ETH Zurich, Zurich, Switzerland. carmen.sanchez@erdw.ethz.ch
- Lethbridge ZA
- Sinogeikin SV
- Williams JJ
- Walton RI
- Evans KE
- Bass JD
- 2008-06-06
Published in:
- The Journal of chemical physics. - 2008
English
Brillouin scattering measurements of the single-crystal elastic properties of the as-made zeolite silicalite mid R:(C(3)H(7))(4)NFmid R:(4)[Si(96)O(192)]-MFI provides the first experimental evidence for on-axis negative Poisson's ratios (auxeticity) in a synthetic zeolite structure. MFI laterally contracts when compressed and laterally expands when stretched along x(1) and x(2) directions in the (001) plane (nu(12)=-0.061, nu(21)=-0.051). The aggregate Poisson's ratio of MFI, although positive, has an anomalously low value nu=0.175(3) compared to other silicate materials. These results suggest that the template-free MFI-silicalite [Si(96)O(192)] might have potential applications as tunable sieve where molecular discriminating characteristics are adjusted by application of stress along specific axes.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1063/1.2912061
- PMID 18532822
- Persistent URL
- https://sonar.ch/global/documents/67207
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