Negative Poisson's ratios in siliceous zeolite MFI-silicalite

Carmen Sanchez-Valle, Zoe A.D. Lethbridge, Stanislav V. Sinogeikin, Jennifer J. Williams, Richard I. Walton, Kenneth E. Evans, Jay D. Bass

Research output: Contribution to journalArticlepeer-review


Brillouin scattering measurements of the single-crystal elastic properties of the as-made zeolite silicalite ∫ (C3 H7)4 NF∫4 [Si96 O192] -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 x1 and x2 directions in the (001) plane (12 =-0.061, 21 =-0.051). The aggregate Poisson's ratio of MFI, although positive, has an anomalously low value =0.175 (3) compared to other silicate materials. These results suggest that the template-free MFI-silicalite [Si96 O192] might have potential applications as tunable sieve where molecular discriminating characteristics are adjusted by application of stress along specific axes.

Original languageEnglish (US)
Article number184503
JournalJournal of Chemical Physics
Issue number18
StatePublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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