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Macedo RDS, Boni Fazzi R, da Costa Ferreira AM, Constantino VRL. Cobalt-based layered double hydroxides revisited: evidence for oxidizing radical generation. NEW J CHEM 2020. [DOI: 10.1039/d0nj00380h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Layered double hydroxides (LDHs) containing transition metal elements such as cobalt show interesting reactivity related to the complexity of cobalt chemistry.
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Affiliation(s)
- Rafael dos Santos Macedo
- Departamento de Química Fundamental, Instituto de Química
- Universidade de São Paulo-USP
- Av. Prof. Lineu Prestes 748
- Brazil
| | - Rodrigo Boni Fazzi
- Departamento de Química Fundamental, Instituto de Química
- Universidade de São Paulo-USP
- Av. Prof. Lineu Prestes 748
- Brazil
| | - Ana Maria da Costa Ferreira
- Departamento de Química Fundamental, Instituto de Química
- Universidade de São Paulo-USP
- Av. Prof. Lineu Prestes 748
- Brazil
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Nosenko V, Strutynska N, Vorona I, Zatovsky I, Dzhagan V, Lemishko S, Epple M, Prymak O, Baran N, Ishchenko S, Slobodyanik N, Prylutskyy Y, Klyui N, Temchenko V. Structure of Biocompatible Coatings Produced from Hydroxyapatite Nanoparticles by Detonation Spraying. NANOSCALE RESEARCH LETTERS 2015; 10:464. [PMID: 26625888 PMCID: PMC4666891 DOI: 10.1186/s11671-015-1160-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 11/17/2015] [Indexed: 06/05/2023]
Abstract
Detonation-produced hydroxyapatite coatings were studied by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Raman spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. The source material for detonation spraying was a B-type carbonated hydroxyapatite powder. The coatings consisted of tetracalcium phosphate and apatite. The ratio depended slightly on the degree of crystallinity of the initial powder and processing parameters of the coating preparation. The tetracalcium phosphate phase was homogeneous; the apatite phase contained defects localized on the sixfold axis and consisted of hydroxyapatite and oxyapatite. Technological factors contributing to the transformation of hydroxyapatite powder structure during coating formation by detonation spraying are discussed.
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Affiliation(s)
- Valentyna Nosenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Nataliia Strutynska
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64/13, 01601, Kyiv, Ukraine.
| | - Igor Vorona
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Igor Zatovsky
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64/13, 01601, Kyiv, Ukraine.
| | - Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Sergiy Lemishko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
- National Technical University of Ukraine "KPI", 03056, Kyiv, Ukraine.
| | - Matthias Epple
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstrasse, 5-7, 45117, Essen, Germany.
| | - Oleg Prymak
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstrasse, 5-7, 45117, Essen, Germany.
| | - Nikolai Baran
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Stanislav Ishchenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Nikolai Slobodyanik
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64/13, 01601, Kyiv, Ukraine.
| | - Yuriy Prylutskyy
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64/13, 01601, Kyiv, Ukraine.
| | - Nickolai Klyui
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
| | - Volodymyr Temchenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kyiv, 03028, Ukraine.
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Zdravkova M, Vanhaelewyn G, Callens F, Gallez B, Debuyst R. Multi-frequency electron paramagnetic resonance study of irradiated human finger phalanxes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:3131-8. [PMID: 16165064 DOI: 10.1016/j.saa.2004.11.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2004] [Revised: 11/30/2004] [Accepted: 11/30/2004] [Indexed: 05/04/2023]
Abstract
Electron paramagnetic resonance (EPR) is often used in dosimetry using biological samples such as teeth and bones. It is generally assumed that the radicals, formed after irradiation, are similar in both tissues as the mineral part of bone and tooth is carbonated hydroxyapatite. However, there is a lack of experimental evidence to support this assumption. The aim of the present study was to contribute to that field by studying powder and block samples of human finger phalanxes that were irradiated and analyzed by multi-frequency EPR. The results obtained from bones are different from the ones obtained in enamel by several respects: the ordering of the apatite crystallites is much smaller in bone, complicating the assignment of the observed CO2- radicals to a specific location, and one type of CO3(3-) radical was only found in enamel. Moreover, a major difference was found in the non-CO2- and non-CO3(3-) signals. The elucidation of the nature of these native signals (in bone and tooth enamel) still represents a big challenge.
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Affiliation(s)
- M Zdravkova
- Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, B-9000 Gent, Belgium
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