Abstract
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 language | English (US) |
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Pages (from-to) | 2171-2175 |
Number of pages | 5 |
Journal | Nano Letters |
Volume | 12 |
Issue number | 4 |
DOIs | |
State | Published - Apr 11 2012 |
Keywords
- Poisson's ratio
- auxetic material
- cellular material
- multilayer film
- nanocomposite
- sponge
ASJC Scopus subject areas
- Bioengineering
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanical Engineering