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Galukhin A, Kachmarzhik A, Rodionov A, Mamin G, Gafurov M, Vyazovkin S. Kinetics and Mechanism of Liquid-State Polymerization of 2,4-Hexadiyne-1,6-diyl bis-( p-toluenesulfonate) as Studied by Thermal Analysis. Polymers (Basel) 2023; 16:7. [PMID: 38201672 PMCID: PMC10780683 DOI: 10.3390/polym16010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 11/29/2023] [Accepted: 12/18/2023] [Indexed: 01/12/2024] Open
Abstract
A detailed investigation of the liquid-state polymerization of diacetylenes by calorimetric (DSC) and spectroscopic (in situ EPR) thermal analysis techniques is performed. Isoconversional kinetic analysis of the calorimetric data reveals that liquid-state polymerization is governed by a well-defined rate-limiting step as evidenced by a nearly constant isoconversional activation energy. By comparison, solid-state polymerization demonstrates isoconversional activation energy that varies widely, signifying multistep kinetics behavior. Unlike the solid-state reaction that demonstrates an autocatalytic behavior, liquid-state polymerization follows a rather unusual zero-order reaction model as established by both DSC and EPR data. Both techniques have also determined strikingly similar Arrhenius parameters for liquid-state polymerization. Relative to the solid-state process, liquid-state polymerization results in quantitative elimination of the p-toluenesulfonate group and the formation of p-toluenesulfonic acid and a polymeric product of markedly different chemical and phase composition.
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Affiliation(s)
- Andrey Galukhin
- Alexander Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia;
| | - Alexander Kachmarzhik
- Alexander Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia;
| | - Alexander Rodionov
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.R.); (G.M.); (M.G.)
| | - Georgy Mamin
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.R.); (G.M.); (M.G.)
| | - Marat Gafurov
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia; (A.R.); (G.M.); (M.G.)
| | - Sergey Vyazovkin
- Department of Chemistry, University of Alabama at Birmingham, 901 S. 14th Street, Birmingham, AL 35294, USA
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Petrova A, Mamin G, Gnezdilov O, Fadeeva I, Antonova O, Forysenkova A, Antoniac IV, Rau JV, Gafurov M. Magnetic Resonance-Based Analytical Tools to Study Polyvinylpyrrolidone-Hydroxyapatite Composites. Polymers (Basel) 2023; 15:4445. [PMID: 38006168 PMCID: PMC10675429 DOI: 10.3390/polym15224445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/13/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
The synthesis of biocompatible and bioresorbable composite materials, such as a "polymer matrix-mineral constituent," stimulating the natural growth of living tissues and the restoration of damaged parts of the body, is one of the challenging problems in regenerative medicine and materials science. Composite films of bioresorbable polymer of polyvinylpyrrolidone (PVP) and hydroxyapatite (HA) were obtained. HA was synthesized in situ in the polymer solution. We applied electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) approaches to study the composite films' properties. The application of EPR in two frequency ranges allowed us to derive spectroscopic parameters of the nitrogen-based light and radiation-induced paramagnetic centers in HA, PVP and PVP-HA with high accuracy. It was shown that PVP did not significantly affect the EPR spectral and relaxation parameters of the radiation-induced paramagnetic centers in HA, while light-induced centers were detected only in PVP. Magic angle spinning (MAS) 1H NMR showed the presence of two signals at 4.7 ppm and -2.15 ppm, attributed to "free" water and hydroxyl groups, while the single line was attributed to 31P. NMR relaxation measurements for 1H and 31P showed that the relaxation decays were multicomponent processes that can be described by three components of the transverse relaxation times. The obtained results demonstrated that the applied magnetic resonance methods can be used for the quality control of PVP-HA composites and, potentially, for the development of analytical tools to follow the processes of sample treatment, resorption, and degradation.
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Affiliation(s)
- Alina Petrova
- Institute of Physics, Kazan Federal University, Kremlyovskaya St.18, 420008 Kazan, Russia; (A.P.); (O.G.)
| | - Georgy Mamin
- Institute of Physics, Kazan Federal University, Kremlyovskaya St.18, 420008 Kazan, Russia; (A.P.); (O.G.)
| | - Oleg Gnezdilov
- Institute of Physics, Kazan Federal University, Kremlyovskaya St.18, 420008 Kazan, Russia; (A.P.); (O.G.)
| | - Inna Fadeeva
- A.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninsky Avenue 49, 119334 Moscow, Russia; (I.F.); (A.F.)
| | - Olga Antonova
- A.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninsky Avenue 49, 119334 Moscow, Russia; (I.F.); (A.F.)
| | - Anna Forysenkova
- A.A. Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninsky Avenue 49, 119334 Moscow, Russia; (I.F.); (A.F.)
| | - Iulian V. Antoniac
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei Street, District 6, 060042 Bucharest, Romania;
- Academy of Romanian Scientists, 54 Splaiul Independentei Street, District 5, 050094 Bucharest, Romania
| | - Julietta V. Rau
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche (ISM-CNR), Via del Fosso del Cavaliere, 100, 00133 Rome, Italy;
- Department of Analytical, Physical and Colloid Chemistry, I.M. Sechenov First Moscow State Medical University, Trubetskaya Str., Build. 8/2, 119048 Moscow, Russia
| | - Marat Gafurov
- Institute of Physics, Kazan Federal University, Kremlyovskaya St.18, 420008 Kazan, Russia; (A.P.); (O.G.)
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Gafurov M, Ganeeva Y, Yusupova T, Murzakhanov F, Mamin G. High-Field (3.4 T) Electron Paramagnetic Resonance, 1H Electron-Nuclear Double Resonance, ESEEM, HYSCORE, and Relaxation Studies of Asphaltene Solubility Fractions of Bitumen for Structural Characterization of Intrinsic Carbon-Centered Radicals. Nanomaterials (Basel) 2022; 12:4218. [PMID: 36500841 PMCID: PMC9735579 DOI: 10.3390/nano12234218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/20/2022] [Accepted: 11/25/2022] [Indexed: 06/17/2023]
Abstract
Petroleum asphaltenes are considered the most irritating components of various oil systems, complicating the extraction, transportation, and processing of hydrocarbons. Despite the fact that the paramagnetic properties of asphaltenes and their aggregates have been studied since the 1950s, there is still no clear understanding of the structure of stable paramagnetic centers in petroleum systems. The paper considers the possibilities of various electron paramagnetic resonance (EPR) techniques to study petroleum asphaltenes and their solubility fractions using a carbon-centered stable free radical (FR) as an intrinsic probe. The dilution of asphaltenes with deuterated toluene made it possible to refine the change in the structure at the initial stage of asphaltene disaggregation. From the measurements of samples of bitumen, a planar circumcoronene-like model of FR structure and FR-centered asphaltenes is proposed. The results show that EPR-based approaches can serve as sensitive numerical tools to follow asphaltenes' structure and their disaggregation.
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Affiliation(s)
- Marat Gafurov
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Str., 420008 Kazan, Russia
| | - Yulia Ganeeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzova Str., 420088 Kazan, Russia
| | - Tatyana Yusupova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzova Str., 420088 Kazan, Russia
| | - Fadis Murzakhanov
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Str., 420008 Kazan, Russia
| | - Georgy Mamin
- Institute of Physics, Kazan Federal University, 18 Kremlevskaya Str., 420008 Kazan, Russia
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Gottscholl A, Kianinia M, Soltamov V, Orlinskii S, Mamin G, Bradac C, Kasper C, Krambrock K, Sperlich A, Toth M, Aharonovich I, Dyakonov V. Initialization and read-out of intrinsic spin defects in a van der Waals crystal at room temperature. Nat Mater 2020; 19:540-545. [PMID: 32094496 DOI: 10.1038/s41563-020-0619-6] [Citation(s) in RCA: 115] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Accepted: 01/20/2020] [Indexed: 05/22/2023]
Abstract
Optically addressable spins in wide-bandgap semiconductors are a promising platform for exploring quantum phenomena. While colour centres in three-dimensional crystals such as diamond and silicon carbide were studied in detail, they were not observed experimentally in two-dimensional (2D) materials. Here, we report spin-dependent processes in the 2D material hexagonal boron nitride (hBN). We identify fluorescence lines associated with a particular defect, the negatively charged boron vacancy ([Formula: see text]), showing a triplet (S = 1) ground state and zero-field splitting of ~3.5 GHz. We establish that this centre exhibits optically detected magnetic resonance at room temperature and demonstrate its spin polarization under optical pumping, which leads to optically induced population inversion of the spin ground state-a prerequisite for coherent spin-manipulation schemes. Our results constitute a step forward in establishing 2D hBN as a prime platform for scalable quantum technologies, with potential for spin-based quantum information and sensing applications.
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Affiliation(s)
- Andreas Gottscholl
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Mehran Kianinia
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Victor Soltamov
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | | | | | - Carlo Bradac
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Christian Kasper
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Klaus Krambrock
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Andreas Sperlich
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Milos Toth
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
- ARC Centre of Excellence for Transformative Meta-Optical Systems, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Igor Aharonovich
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia.
- ARC Centre of Excellence for Transformative Meta-Optical Systems, University of Technology Sydney, Ultimo, New South Wales, Australia.
| | - Vladimir Dyakonov
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany.
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Goldberg M, Gafurov M, Makshakova O, Smirnov V, Komlev V, Barinov S, Kudryavtsev E, Sergeeva N, Achmedova S, Mamin G, Murzakhanov F, Orlinskii S. Influence of Al on the Structure and in Vitro Behavior of Hydroxyapatite Nanopowders. J Phys Chem B 2019; 123:9143-9154. [DOI: 10.1021/acs.jpcb.9b08157] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Margarita Goldberg
- A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49 Leninsky pr., 119334 Moscow, Russia
| | - Marat Gafurov
- Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia
| | - Olga Makshakova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str. 2/31, 420111 Kazan, Russian Federation
| | - Valeriy Smirnov
- A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49 Leninsky pr., 119334 Moscow, Russia
| | - Vladimir Komlev
- A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49 Leninsky pr., 119334 Moscow, Russia
| | - Sergei Barinov
- A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49 Leninsky pr., 119334 Moscow, Russia
| | - Egor Kudryavtsev
- The National Research University ″Belgorod State University″, 85 Pobedy str., 308015 Belgorod, Russia
| | - Natalia Sergeeva
- Federal State Budgetary Institution, National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, 3 2nd Botkinsky pass., 125284 Moscow, Russia
| | - Suraya Achmedova
- Federal State Budgetary Institution, National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, 3 2nd Botkinsky pass., 125284 Moscow, Russia
| | - Georgy Mamin
- Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia
| | - Fadis Murzakhanov
- Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia
| | - Sergei Orlinskii
- Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia
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Gafurov M, Chelyshev Y, Ignatyev I, Zanochkin A, Mamin G, Iskhakova K, Kiiamov A, Murzakhanov F, Orlinskii S. Connection Between the Carotid Plaque Instability and Paramagnetic Properties of the Intrinsic Mn2+ Ions. BioNanoSci 2016. [DOI: 10.1007/s12668-016-0274-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gafurov M, Biktagirov T, Mamin G, Klimashina E, Putlayev V, Kuznetsova L, Orlinskii S. The Interplay of manganese and nitrate in hydroxyapatite nanoparticles as revealed by pulsed EPR and DFT. Phys Chem Chem Phys 2015; 17:20331-7. [PMID: 26190281 DOI: 10.1039/c5cp01986a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The interplay of oppositely charged substitutions in the structure of hydroxyapatite (HAp) nanopowders is investigated on the atomic level by pulsed electron paramagnetic resonance (EPR) technique and ab initio density functional theory calculations. Benefits of EPR to determine Mn(2+) ions in nano-HAp samples are demonstrated. A simple approach based on the measurements of electron spin relaxation times allowed observing the strong influence of fast-relaxing Mn(2+) ions on the relaxation characteristics of the nitrate ions (NO3(-)/NO3(2-)) incorporated in trace amounts. Based on the results of ab initio calculations, we show the propensity of Mn(2+) and NO3(-)/NO3(2-) to associate within the HAp crystal lattice. This could have a direct impact on the functional properties of the material especially to resorption and ion exchange. Furthermore, such an effect can increase a propensity of undesired impurities to incorporate into the doped nanocrystals.
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Affiliation(s)
- Marat Gafurov
- Kazan Federal University, Institute of Physics, 420008 Kazan, Russian Federation.
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Biktagirov T, Gafurov M, Mamin G, Klimashina E, Putlayev V, Orlinskii S. Combination of EPR measurements and DFT calculations to study nitrate impurities in the carbonated nanohydroxyapatite. J Phys Chem A 2014; 118:1519-26. [PMID: 24512217 DOI: 10.1021/jp410900m] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We demonstrate the application of the combined experimental-computational approach for studying the anionic impurities in hydroxyapatite (HAp). Influence of the carbonation level (x) on the concentration of the NO3(2-) radicals in the HAp nanocrystals of Ca10-xNax(PO4)6-x(CO3)x(OH)2 with x in the range 0 < x < 2 and average sizes of 30 nm is investigated by different analytical methods including electron paramagnetic resonance (EPR). Stable NO3(2-) radicals are formed under X-ray irradiation of nano-HAp samples from NO3(-) ions incorporated in trace amounts during the wet synthesis process. Density functional theory (DFT) based calculations show energetic preference for the PO4 group substitution by NO3(-) ions. Comparison of the calculated and experimental spectroscopic parameters (g and hyperfine tensors) reveals that EPR detects the NO3(2-) radicals located in the positions of the PO4 group only. It is shown that with the increase in x, the carbonate ions substitute the NO3(2-)/NO3(-) ions. DFT calculations confirm that carbonate incorporation in HAp structure is energetically more favorable than the formation of the nitrate defect.
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Affiliation(s)
- Timur Biktagirov
- Institute of Physics, Kazan Federal University , Kremlevskaya Street 18, 420008 Kazan, Russian Federation
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Baibekov E, Kurkin I, Gafurov M, Endeward B, Rakhmatullin R, Mamin G. Coherence times and Rabi oscillations in CaWO₄:Cr(5+) crystal. J Magn Reson 2011; 209:61-68. [PMID: 21273101 DOI: 10.1016/j.jmr.2010.12.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 12/30/2010] [Accepted: 12/30/2010] [Indexed: 05/30/2023]
Abstract
The coherence times of dopant pentavalent chromium ions in CaWO₄ single crystal (0.0006at.% Cr(5+)) were investigated both theoretically and experimentally. Temperature dependences of spin-lattice relaxation time T₁ and phase memory time T(M) were measured in the temperature range 6-30 K at high (94 GHz, W band) and low (3.5 GHz, S band) frequencies of electron spin resonance. It follows from T(M) calculations that phase relaxation of Cr(5+) ion arises mainly from magnetic dipole interactions between the chromium ions. Anomalously fast damping of Rabi oscillations is detected in both S- and W-band experiments. It is shown that this phenomenon is caused by microwave field inhomogeneity inside the resonator. Relations between the damping time of Rabi oscillations, Rabi frequency and the crystal sample size are obtained. Lumped-element resonators and smaller sample dimensions are suggested to lower spin dephasing during transient nutations.
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Affiliation(s)
- Eduard Baibekov
- Kazan Federal University, 420008 Kazan, Russian Federation, Russia.
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Galyavich A, Mamin G, Kovaleva E, Orlinskii S, Putliaev V, Salakhov M, Silkin N, Khairullin R, Chelyshev Y. P381 DIRECT INVESTIGATION OF BIVALENT MANGANESE IN ATHEROSCLEROTIC PLAQUE BY MEANS OF HIGH-FREQUENCY ELECTRON PARAMAGNETIC RESONANCE SPECTROSCOPY. ATHEROSCLEROSIS SUPP 2010. [DOI: 10.1016/s1567-5688(10)70448-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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