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Jelínek M, Buixaderas E, Drahokoupil J, Kocourek T, Remsa J, Vaněk P, Vandrovcová M, Doubková M, Bačáková L. Laser-synthesized nanocrystalline, ferroelectric, bioactive BaTiO 3/Pt/FS for bone implants. J Biomater Appl 2018; 32:1464-1475. [PMID: 29621929 DOI: 10.1177/0885328218768646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The goal of our study is to design BaTiO3 ferroelectric layers that will cover metal implants and provide improved osseointegration. We synthesized ferroelectric BaTiO3 layers on Pt/fused silica substrates, and we studied their physical and bio-properties. BaTiO3 and Pt layers were prepared using KrF excimer laser ablation at substrate temperature Ts in the range from 200°C to 750°C in vacuum or under oxygen pressure of 10 Pa, 15 Pa, and 20 Pa. The BaTiO3/Pt and Pt layers adhered well to the substrates. BaTiO3 films of crystallite size 60-140 nm were fabricated. Ferroelectric loops were measured and ferroelectricity was also confirmed using Raman scattering measurements. Results of atomic force microscopy topology and the X-ray diffraction structure of the BaTiO3/Pt/fused silica multilayers are presented. The adhesion, viability, growth, and osteogenic differentiation of human osteoblast-like Saos-2 cells were also studied. On days 1, 3, and 7 after seeding, the lowest cell numbers were found on non-ferroelectric BaTiO3, while the values on ferroelectric BaTiO3, on non-annealed and annealed Pt interlayers, and on the control tissue culture polystyrene dishes and microscopic glass slides were similar, and were usually significantly higher than on non-ferroelectric BaTiO3. A similar trend was observed for the intensity of the fluorescence of alkaline phosphatase, a medium-term marker of osteogenic differentiation, and of osteocalcin, a late marker of osteogenic differentiation. At the same time, the cell viability, tested on day 1 after seeding, was very high on all tested samples, reaching 93-99%. Ferroelectric BaTiO3 films deposited on metallic bone implants through a Pt interlayer can therefore markedly improve the osseointegration of these implants in comparison with non-ferroelectric BaTiO3 films.
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Affiliation(s)
- Miroslav Jelínek
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic.,2 Czech Technical University in Prague, Faculty of Biomedical Engineering, Kladno, Czech Republic
| | - Elena Buixaderas
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic
| | - Jan Drahokoupil
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic
| | - Tomáš Kocourek
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic.,2 Czech Technical University in Prague, Faculty of Biomedical Engineering, Kladno, Czech Republic
| | - Jan Remsa
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic.,2 Czech Technical University in Prague, Faculty of Biomedical Engineering, Kladno, Czech Republic
| | - Přemysl Vaněk
- 1 Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic
| | - Marta Vandrovcová
- 3 Institute of Physiology of the Czech Academy of Sciences, Prague 4, Czech Republic
| | - Martina Doubková
- 3 Institute of Physiology of the Czech Academy of Sciences, Prague 4, Czech Republic
| | - Lucie Bačáková
- 3 Institute of Physiology of the Czech Academy of Sciences, Prague 4, Czech Republic
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Wittmann G, Macfarlane RM. Photon-gated photoconductivity of Pr(3+):YAG. OPTICS LETTERS 1996; 21:426-428. [PMID: 19865427 DOI: 10.1364/ol.21.000426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have observed photon-gated photoconductivity in Pr:YAG, providing clear evidence for photoionization of the trivalent praseodymium ion in the solid state. Photoionization occurs by two-step absorption from (3)H(4)(1) ? (1)D(2)(1) followed by an excited-state absorption from (1)D(2) to the lowest component of the 4f5d configuration. The excitation spectrum of the photocurrent shows sharp (1)D(2) spectral features, providing unambiguous assignment of the photocurrent.
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