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Tuning and Switching the Hypersonic Phononic Properties of Elastic Impedance Contrast Nanocomposites

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journal contribution
posted on 22.06.2010, 00:00 authored by Akihiro Sato, Yan Pennec, Nitin Shingne, Thomas Thurn-Albrecht, Wolfgang Knoll, Martin Steinhart, Bahram Djafari-Rouhani, George Fytas
Anodic aluminum oxide (AAO) containing arrays of aligned cylindrical nanopores infiltrated with polymers is a well-defined model system for the study of hypersound propagation in polymer nanocomposites. Hypersonic phononic properties of AAO/polymer nanocomposites such as phonon localization and anisotropic sound propagation can be tailored by adjusting elastic contrast and density contrast between the components. Changes in density and elastic properties of the component located in the nanopores induced by phase transitions allow reversible modification of the phononic band structure and mode switching. As example in case, the crystallization and melting of poly(vinylidene difluoride) inside AAO was investigated.