Ultrasoft 100 nm thick zero poisson's ratio film with 60% reversible compressibility

Chieu Nguyen, Vivek Maheshwari, Ravi F. Saraf

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


About a 100 nm thick multilayer film of nanoparticle monolayers and polymer layers is shown to behave like cellular-foam with a modulus below 100 KPa. The 1.25 cm radius film adhered to a rigid surface can be compressed reversibly to 60% strain. The more than 4 orders of magnitude lower modulus compared to its constituents is explained by considering local bending in the (nano)cellular structure, similar to cork and wings of beetles. As the rigidity of the polymer backbone is increased in just four monolayers, the modulus of the composite increases by over 70%. Electro-optical map of the strain distribution over the area of compression and increase in modulus with thickness indicates the films have zero Poisson's ratio.

Original languageEnglish (US)
Pages (from-to)2171-2175
Number of pages5
JournalNano Letters
Issue number4
StatePublished - Apr 11 2012


  • Poisson's ratio
  • auxetic material
  • cellular material
  • multilayer film
  • nanocomposite
  • sponge

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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