Tuning and switching the hypersonic phononic properties of elastic impedance contrast nanocomposites.
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.
Sato
Akihiro
A
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Pennec
Yan
Y
Shingne
Nitin
N
Thurn-Albrecht
Thomas
T
Knoll
Wolfgang
W
Steinhart
Martin
M
Djafari-Rouhani
Bahram
B
Fytas
George
G
D000162:Acoustics; D000537:Aluminum Oxide / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D055119:Elastic Modulus; D017097:Electric Impedance; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D010316:Particle Size; D013499:Surface Properties
D046911:Macromolecular Substances; D000537:Aluminum Oxide