Radiation-Induced Stable Radicals in Calcium Phosphates: Results of Multifrequency EPR, EDNMR, ESEEM, and ENDOR Studies
| Autor: | M. A. Goldberg, Georgy Mamin, Alexander Yu. Fedotov, Andris Antuzevics, Sergei Orlinskii, B. V. Yavkin, Fadis Murzakhanov, Vladimir S. Komlev, Natalia V. Petrakova, Marat Gafurov, Peter Olegovich Grishin |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science QH301-705.5 QC1-999 Radical 02 engineering and technology 010402 general chemistry 01 natural sciences Radiation-induced center Spectral line law.invention calcium phosphate Crystal EDNMR law General Materials Science Biology (General) Electron paramagnetic resonance Spectroscopy QD1-999 Instrumentation Hyperfine structure Fluid Flow and Transfer Processes Physics Process Chemistry and Technology General Engineering Resonance ENDOR Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology Hyperfine interaction 3. Good health 0104 chemical sciences Computer Science Applications hyperfine interaction Chemistry Calcium phosphate Quadrupole NATURAL SCIENCES [Research Subject Categories] ESEEM Physical chemistry TA1-2040 0210 nano-technology radiation-induced center |
| Zdroj: | Applied Sciences Volume 11 Issue 16 Applied Sciences, Vol 11, Iss 7727, p 7727 (2021) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app11167727 |
| Popis: | This article presents the results of a study of radiation-induced defects in various synthetic calcium phosphate (CP) powder materials (hydroxyapatite—HA and octacalcium phosphate—OCP) by electron paramagnetic resonance (EPR) spectroscopy at the X, Q, and W-bands (9, 34, 95 GHz for the microwave frequencies, respectively). Currently, CP materials are widely used in orthopedics and dentistry owing to their high biocompatibility and physico-chemical similarity with human hard tissue. It is shown that in addition to the classical EPR techniques, other experimental approaches such as ELDOR-detected NMR (EDNMR), electron spin echo envelope modulation (ESEEM), and electronnuclear double resonance (ENDOR) can be used to analyze the electron–nuclear interactions of CP powders. We demonstrated that the value and angular dependence of the quadrupole interaction for14 N nuclei of a nitrate radical can be determined by the EDNMR method at room temperature. The ESEEM technique has allowed for a rapid analysis of the nuclear environment and estimation of the structural positions of radiation-induced centers in various crystal matrices. ENDOR spectra can provide information about the distribution of the nitrate radicals in the OCP structure. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Published under the CC BY 4.0 license. Authors would like to thank the Russian Foundation for Basic Research, project no. 18-29-11086. Institute of Solid State Physics, University of Latvia as the Center of Excellence received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01–2016-2017- TeamingPhase2 under grant agreement No. 739508, project CAMART2. |
| Databáze: | OpenAIRE |
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