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Hybrid nanocomposites based on crystalline nanoparticles dispersed in polymer matrix has been widely studied in the past few years because of the ability of these materials to combine both properties of organic polymer and inorganic nanoparticles. The aim of this work is to tune mechanical properties of piezoelectric polymer by adding nanoparticles to the matrix. In this paper alumina nanoparticles...
Alumina nanoparticles were incorporated into copolymer of vinylidene difluoride and trifluoroethylene (P(VDF-TrFE)) to form nanocomposite. Thin films were prepared on silicon wafers and some acoustic, optical and mechanical properties were studied by Brillouin spectroscopy. The morphology of the polymer and the dispersion quality of the nanoparticles were observed by Transmission Electron Microscopy...
This study deals with using Brillouin spectroscopy to determine the temperature variation of potassium niobate elastic constants. Two different samples have been used (Y- and Z-cut), and all the measurements were done in the temperature range between 300 K and 420 K. The calculations concern only the first-order coefficients. The acoustic velocity is then determined for each sample in 3 directions...
In this paper we present the study of potassium niobate KNbO3 single crystals with different cuts in order to observe the temperature dependence of the acoustic velocity of bulk waves in chosen crystallographic directions. The crystal was temperature controlled to determine the variation of the elastic constant versus the temperature. The novelty of this work concerns the determination for the first...
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