Bifurcated mechanical behavior of deformed periodic porous solids

Srikanth Singamaneni, Katia Bertoldi, Sehoon Chang, Ji Hyun Jang, Seth L. Young, Edwin L. Thomas, Mary C. Boyce, Vladimir V. Tsukruk

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The transformation of periodic microporous structures fabricated by interference lithography followed by their freezing below glass transition is described. Periodic porous microstructures subjected to internal compressive stresses can undergo sudden structural transformation at a critical strain. The pattern transformation of collapsed pores is caused by the stresses originated during the polymerization of acrylic acid (rubbery component) inside of cylindrical pores and the subsequent solvent evaporation in the organized microporous structure. By confining the polymerization of acrylic acid to localized porous areas complex microscopic periodic structures can be obtained. The control over the mechanical instabilities in periodic porous solids at a sub-micron scale demonstrated here suggests the potential mechanical tunability of photonic, transport, adhesive, and phononic properties of such periodic porous solids.

Original languageEnglish
Pages (from-to)1426-1436
Number of pages11
JournalAdvanced Functional Materials
Volume19
Issue number9
DOIs
StatePublished - May 8 2009

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