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Acoustic sensors which can function at high temperatures have important potential uses. In this work we report on the deposition, characterization and qualitative assessment of piezoelectric behaviour of orthorhombic Ta2O5• It is shown that orthorhombic Ta2O5 belongs to the class 2mm. XRD analysis of films annealed for 1 min., 10 min. and 1 hr at 800°C and 900°C reveal the formation of (0 0 1), (1 10 0) and (1 11 0) orientations at 800 °C, but the (1 10 0) increases at the expense of the other two as the annealing period is extended. At 900°C the dominant orientations are (1 10 0) and (2 9 0). The piezoelectric effect is significantly stronger after annealing and the stronger piezoelectric effect does not correlate with the presence of (1 10 0) and (2 9 0) so much as with the absence of (0 0 1) and (1 11 0).
3D fibrous scaffolds with shell-core fiber architecture offer the possibility to create multifunctional structures. In this study, a construct that combines mechanical stability with the core polymer and optimal surface properties for cell-material interactions with the shell polymer is discussed. Scaffolds were fabricated by a rapid prototyped technique known as 3D Fiber Deposition (3DF) and used for cartilage tissue engineering. Cells maintained the typical rounded morphology of cartilage in the shell-core scaffolds, while they spread into a spindle-like shape in scaffolds fabricated with the core polymer only. Extracellular matrix production and an increase in the dynamic stiffness of the engineered construct revealed a progressive maturation of the formed tissue, suggesting that shell-core 3D scaffolds could be optimal for cartilage tissue engineering.
In 1985 it was first reported that monoclinic Ta2O5 has piezoelectric properties comparable to ZnO. In this work we report on the deposition, characterization, and qualitative assessment of the piezoelectric behavior of orthorhombic Ta2O5. Reactive magnetron sputtering was used to deposit thin films of Ta2O5 onto substrates of 316L stainless steel. Without substrate heating the crystallinity was poor. A rapid thermal anneal improved the crystallinity. The orthorhombic phase was dominantly present on all substrates. The piezoelectric property was qualitatively assessed, including a high temperature test at 650 °C.
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