%0 Journal Article %A Sato, Akihiro %A Pennec, Yan %A Shingne, Nitin %A Thurn-Albrecht, Thomas %A Knoll, Wolfgang %A Steinhart, Martin %A Djafari-Rouhani, Bahram %A Fytas, George %D 2010 %T Tuning and Switching the Hypersonic Phononic Properties of Elastic Impedance Contrast Nanocomposites %U https://acs.figshare.com/articles/journal_contribution/Tuning_and_Switching_the_Hypersonic_Phononic_Properties_of_Elastic_Impedance_Contrast_Nanocomposites/2758867 %R 10.1021/nn100519h.s001 %2 https://acs.figshare.com/ndownloader/files/4451941 %K AAO %K Hypersonic Phononic Properties %K hypersound propagation %K anisotropic sound propagation %K nanopore %K polymer nanocomposites %K Elastic Impedance Contrast NanocompositesAnodic aluminum oxide %K phase transitions %K Hypersonic phononic properties %K component %K phononic band structure %K model system %K phonon localization %K density contrast %X 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. %I ACS Publications