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Atta H, Mahmoud KR, Salim ESI, Elmohsnawy E, El-Shaer A. Correlation between positron annihilation lifetime and photoluminescence measurements for calcined Hydroxyapatite. Sci Rep 2024; 14:10370. [PMID: 38710708 DOI: 10.1038/s41598-024-59855-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 04/16/2024] [Indexed: 05/08/2024] Open
Abstract
Hydroxyapatite (HAp) Ca10(PO4)6(OH)2 is a compound that has stable chemical properties, composition, and an affinity for human bone. As a result, it can be used in odontology, cancer treatment, and orthopedic grafts to repair damaged bone. To produce calcined HAp at 600 °C with different pH values, a wet chemical precipitation method was employed. All synthesized HAp samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), photoluminescence (PL), Zeta potential, and positron annihilation lifetime spectroscopy (PALS). The XRD results revealed that all calcined HAp samples were formed in a hexagonal structure with a preferred (002) orientation at different pH values. The crystal size of the samples was determined using the Scherrer equation, which ranged from 16 to 25 nm. The SEM and TEM results showed that the morphology of the samples varied from nanorods to nanospheres and rice-like structures depending on the pH value of the sample. The PL measurements indicated that the blue and green emission peaks of HAp were due to defects (bulk, surface, and interface) in the samples, which created additional energy levels within the band gap. According to Zeta potential measurements, the charge carrier changed from a positive to negative value, ranging from 3.94 mV to - 2.95 mV. PALS was used to understand the relationship between the defects and the photoluminescence (PL) properties of HAp. Our results suggest that HAp nanoparticles have excellent potential for developing non-toxic biomedical and optical devices for phototherapy.
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Affiliation(s)
- Hoda Atta
- Physics Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
| | - Kamal R Mahmoud
- Physics Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
| | - El Sayed I Salim
- Research Lab. of Molecular Carcinogenesis, Zoology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Eithar Elmohsnawy
- Department of Botany, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt
| | - Abdelhamid El-Shaer
- Physics Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
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2
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Lopez GP, Gallegos MV, Peluso MA, Damonte LC, Sambeth JE, Bellotti N. ZnO recovered from spent alkaline batteries as antimicrobial additive for waterborne paints. Emergent Mater 2022; 6:147-158. [PMID: 36597484 PMCID: PMC9801357 DOI: 10.1007/s42247-022-00443-2] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
Biocides are employed to prevent biodeterioration in waterborne paints. In the present study, we used zinc oxide nanoparticles (obtained from spent alkaline batteries) as biocide for indoor waterborne paint at 1.5% of the total solid content in paint. Two different zinc oxides synthesized from spent alkaline batteries, which showed photocatalyst activity, were employed as an antimicrobial agents. After leaching the anode of alkaline batteries, zinc was precipitated from the leachate liquor by introducing oxalic acid (O-ZnO) or sodium carbonate (C-ZnO). The antimicrobial properties of the prepared oxides were tested against Staphylococcus aureus (bacteria), Chaetomium globosum, and Aspergillus fumigatus (fungi) using agar well diffusion method. C-ZnO inhibited the growth of all the strains studied and presented enhanced activity than O-ZnO. The better performance as antimicrobial agent of C-ZnO compared to O-ZnO was attributed to its lower crystallite size, higher amount of oxygen monovacancies, and to its lower band gap energy. The oxide with the best performance in antimicrobial activity, C-ZnO, was employed for the formulation of waterborne acrylic paints. It was observed that 1.5% C-ZnO improved the antifungal properties and antibacterial properties compared to the control sample.
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Affiliation(s)
- Guillermo P. Lopez
- Centro de Investigación Y Desarrollo en Tecnología de Pinturas - CIDEPINT (CIC-CONICET-UNLP), La Plata, Argentina
| | - María V. Gallegos
- Centro de Investigación Y Desarrollo en Ciencias Aplicadas, CIC-CONICET-UNLP, La Plata, Argentina
| | - Miguel A. Peluso
- Centro de Investigación Y Desarrollo en Ciencias Aplicadas, CIC-CONICET-UNLP, La Plata, Argentina
| | - Laura C. Damonte
- Instituto de Física, Dto. De Física, Facultad de Cs. Exactas, CCT-CONICET-UNLP, La Plata, Argentina
| | - Jorge E. Sambeth
- Centro de Investigación Y Desarrollo en Ciencias Aplicadas, CIC-CONICET-UNLP, La Plata, Argentina
| | - Natalia Bellotti
- Centro de Investigación Y Desarrollo en Tecnología de Pinturas - CIDEPINT (CIC-CONICET-UNLP), La Plata, Argentina
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Zheng X, Zhao J, Liu Q, Xu M, Yang S, Zeng M, Qi C, Cao X, Wang B. Chitosan modified Ti-PILC supported PdO x catalysts for coupling reactions of aryl halides with terminal alkynes. Int J Biol Macromol 2020; 158:67-74. [PMID: 32348863 DOI: 10.1016/j.ijbiomac.2020.04.203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/11/2020] [Accepted: 04/24/2020] [Indexed: 02/04/2023]
Abstract
Biopolymer of chitosan (CS) and titanium pillared clays (Ti-PILCs) have been combined in a hybrid as advanced supports for immobilization of PdOx=0,1 species to prepare novel PdOx=0,1@Ti-PILC/CS nano-composite catalysts. The Ti-PILC materials showed high specific surface areas and abundant meso-porous structure with many irregular pore channels caused by collapses of layered structure of clay during Ti pillaring process. Both CS chains and sub-nano sized PdOx particles were successfully incorporated into the pore channels of Ti-PILC, resulting in a decrease in both the specific surface areas and uniform distribution of pore size. Besides conventional methods characterizations, the strong interactions between PdOx species and Ti-PILC/CS support were further evidenced with positron annihilation lifetime spectroscopy studies. The resultant PdOx@Ti-PILC/CS catalyst was highly active for the coupling reactions of aryl halides with phenyl acetylenes. It was recyclable and gave excellent yield up to 13 runs with low leaching of Pd species.
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Affiliation(s)
- Xiu Zheng
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Jing Zhao
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Qi Liu
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Mengdie Xu
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Shuai Yang
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Minfeng Zeng
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
| | - Chenze Qi
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Xingzhong Cao
- Institute of High Energy Physics, The Chinese Academy of Science, Beijing 100049, China.
| | - Baoyi Wang
- Institute of High Energy Physics, The Chinese Academy of Science, Beijing 100049, China
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Kavetskyy T, Smutok O, Demkiv O, Maťko I, Švajdlenková H, Šauša O, Novák I, Berek D, Čechová K, Pecz M, Nykolaishyn-Dytso O, Wojnarowska-Nowak R, Broda D, Gonchar M, Zgardzińska B. Microporous carbon fibers as electroconductive immobilization matrixes: Effect of their structure on operational parameters of laccase-based amperometric biosensor. Mater Sci Eng C Mater Biol Appl 2020; 109:110570. [PMID: 32228922 DOI: 10.1016/j.msec.2019.110570] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/22/2019] [Accepted: 12/17/2019] [Indexed: 12/21/2022]
Abstract
In this study, we describe the fabrication of sensitive biosensor for the detection of phenolic substrates using laccase immobilized onto two types of microporous carbon fibers (CFs). The main characteristics of microporous CFs used for preparation of biosensors are given. Two CFs were characterized by different specific surface area, CFA (<1 m2·g-1) and CFB (1448 m2·g-1), but with comparable size of the micropores estimated by positron annihilation lifetime spectroscopy. The structural analysis was shown that CFA is formed by thin interwoven fibers forming a highly porous structure, as well as CFB - by granular formations with uneven edges that shape a cellulose membrane of lower porosity. The results of amperometric analysis revealed that the laccase-bound CFs possesses better electrochemical behavior for laccase than non-modified rod carbon electrodes (control). Using chronoamperometric analysis, the operational parameters of the CFs-modified bioelectrodes were compared to control bioelectrodes. The bioelectrodes based on CFs have demonstrated 2.4-2.7 folds enhanced maximal current at substrate saturation (Imax) values, 1.2-1.4 folds increased sensitivity and twice wide linearity compared with control bioelectrodes. The sensitivity of the developed CFs-based bioelectrodes was improved compared with the laccase-bound electrodes, described in literature. The developed biosensor was tested for catechol analysis in the real communal wastewater sample.
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Affiliation(s)
- Taras Kavetskyy
- Drohobych Ivan Franko State Pedagogical University, 82100 Drohobych, Ukraine; The John Paul II Catholic University of Lublin, 20-950 Lublin, Poland.
| | - Oleh Smutok
- Drohobych Ivan Franko State Pedagogical University, 82100 Drohobych, Ukraine; Institute of Cell Biology, National Academy of Sciences of Ukraine, 79005 Lviv, Ukraine
| | - Olha Demkiv
- Drohobych Ivan Franko State Pedagogical University, 82100 Drohobych, Ukraine; Institute of Cell Biology, National Academy of Sciences of Ukraine, 79005 Lviv, Ukraine
| | - Igor Maťko
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
| | | | - Ondrej Šauša
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
| | - Ivan Novák
- Polymer Institute, Slovak Academy of Sciences, 845 41 Bratislava, Slovakia
| | - Dušan Berek
- Polymer Institute, Slovak Academy of Sciences, 845 41 Bratislava, Slovakia
| | - Katarína Čechová
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
| | - Michal Pecz
- Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, 842 48 Bratislava, Slovakia
| | | | | | - Daniel Broda
- Faculty of Biotechnology, University of Rzeszow, 35-959 Rzeszow, Poland
| | - Mykhailo Gonchar
- Drohobych Ivan Franko State Pedagogical University, 82100 Drohobych, Ukraine; Institute of Cell Biology, National Academy of Sciences of Ukraine, 79005 Lviv, Ukraine
| | - Bożena Zgardzińska
- Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
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Gaydarov V, Chen Z, Zamfirova G, Söylemez MA, Zhang J, Djourelov N, Zhang J. Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures. Carbohydr Polym 2019; 219:56-62. [PMID: 31151546 DOI: 10.1016/j.carbpol.2019.05.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/05/2019] [Accepted: 05/06/2019] [Indexed: 11/18/2022]
Abstract
Two new groups of cellulose esters with a substituent, either trifluoromethylbenzoate or methylbenzoate, were synthesized in homogeneous conditions. The actual presence of aromatic substituents was demonstrated by 1H-NMR spectra. The mechanical and structural peculiarities were determined by Depth Sensing Indentation (DSI) and Positron Annihilation Lifetime Spectroscopy (PALS) techniques. The relative position of CH3 and CF3 groups on the aromatic substituents influences the molecular packing differently and affects the formation of free volumes. The hardness characteristics and modulus of the corresponding cellulose esters were the lowest when the CH3 and CF3 groups are in m-position on the aromatic substituents. Meanwhile, they exhibited the highest number density of the free volume holes, as revealed by the o-Ps intensity values. An inverse linear relationship between the hardness, respectively on the modulus, and the o-Ps intensity was found. A simplified scheme of the structural feature of the investigated cellulose esters was proposed.
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Affiliation(s)
- Valentin Gaydarov
- Todor Kableshkov University of Transport, 158 Geo Milev str. Sofia, 1574, Bulgaria
| | - Zhangyan Chen
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China
| | - Galina Zamfirova
- Todor Kableshkov University of Transport, 158 Geo Milev str. Sofia, 1574, Bulgaria
| | - Meshude Akbulut Söylemez
- Hacettepe University, Chemistry Department, Polymer Chemistry Division, Beytepe, Ankara, 06800, Turkey
| | - Jinming Zhang
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China
| | - Nikolay Djourelov
- Extreme Light Infrastructure - Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, Bucharest-Magurele, 077125, Romania.
| | - Jun Zhang
- CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China
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Shpotyuk O, Ingram A, Bujňáková Z, Baláž P. Microstructure Hierarchical Model of Competitive e +-Ps Trapping in Nanostructurized Substances: from Nanoparticle-Uniform to Nanoparticle-Biased Systems. Nanoscale Res Lett 2017; 12:72. [PMID: 28124298 PMCID: PMC5267590 DOI: 10.1186/s11671-017-1858-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 01/17/2017] [Indexed: 06/06/2023]
Abstract
Microstructure hierarchical model considering the free-volume elements at the level of interacting crystallites (non-spherical approximation) and the agglomerates of these crystallites (spherical approximation) was developed to describe free-volume evolution in mechanochemically milled As4S4/ZnS composites employing positron annihilation spectroscopy in a lifetime measuring mode. Positron lifetime spectra were reconstructed from unconstrained three-term decomposition procedure and further subjected to parameterization using x3-x2-coupling decomposition algorithm. Intrinsic inhomogeneities due to coarse-grained As4S4 and fine-grained ZnS nanoparticles were adequately described in terms of substitution trapping in positron and positronium (Ps) (bound positron-electron) states due to interfacial triple junctions between contacting particles and own free-volume defects in boundary compounds. Compositionally dependent nanostructurization in As4S4/ZnS nanocomposite system was imagined as conversion from o-Ps trapping sites to positron traps. The calculated trapping parameters that were shown could be useful to characterize adequately the nanospace filling in As4S4/ZnS composites.
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Affiliation(s)
- Oleh Shpotyuk
- Jan Dlugosz University, al. Armii Krajowej, 13/15, 42201, Czestochowa, Poland.
- Vlokh Institute of Physical Optics, 23, Dragomanov str., 79005, Lviv, Ukraine.
| | - Adam Ingram
- Opole University of Technology, 75, Ozimska str., 45370, Opole, Poland
| | - Zdenka Bujňáková
- Institute of Geotechnics of Slovak Academy of Sciences, 45, Watsonova str., 04001, Košice, Slovakia
| | - Peter Baláž
- Institute of Geotechnics of Slovak Academy of Sciences, 45, Watsonova str., 04001, Košice, Slovakia
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7
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Shpotyuk O, Adamiak S, Bezvushko E, Cebulski J, Iskiv M, Shpotyuk O, Balitska V. Light-Curing Volumetric Shrinkage in Dimethacrylate-Based Dental Composites by Nanoindentation and PAL Study. Nanoscale Res Lett 2017; 12:75. [PMID: 28124300 PMCID: PMC5267579 DOI: 10.1186/s11671-017-1845-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 01/13/2017] [Indexed: 06/06/2023]
Abstract
Light-curing volumetric shrinkage in dimethacrylate-based dental resin composites Dipol® is examined through comprehensive kinetics research employing nanoindentation measurements and nanoscale atomic-deficient study with lifetime spectroscopy of annihilating positrons. Photopolymerization kinetics determined through nanoindentation testing is shown to be described via single-exponential relaxation function with character time constants reaching respectively 15.0 and 18.7 s for nanohardness and elastic modulus. Atomic-deficient characteristics of composites are extracted from positron lifetime spectra parameterized employing unconstrained x3-term fitting. The tested photopolymerization kinetics can be adequately reflected in time-dependent changes observed in average positron lifetime (with 17.9 s time constant) and fractional free volume of positronium traps (with 18.6 s time constant). This correlation proves that fragmentation of free-volume positronium-trapping sites accompanied by partial positronium-to-positron traps conversion determines the light-curing volumetric shrinkage in the studied composites.
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Affiliation(s)
- Olha Shpotyuk
- Danylo Halytsky Lviv National Medical University, 69, Pekarska St., Lviv, 79010, Ukraine.
| | - Stanislaw Adamiak
- Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, University of Rzeszow, 35-959, Rzeszow, Poland
| | - Elvira Bezvushko
- Danylo Halytsky Lviv National Medical University, 69, Pekarska St., Lviv, 79010, Ukraine
| | - Jozef Cebulski
- Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, University of Rzeszow, 35-959, Rzeszow, Poland
| | - Maryana Iskiv
- Danylo Halytsky Lviv National Medical University, 69, Pekarska St., Lviv, 79010, Ukraine
| | - Oleh Shpotyuk
- Jan Dlugosz University in Czestochowa, 13/15, Armii Krajowej St., 42200, Czestochowa, Poland
- Vlokh Institute of Physical Optics, 23, Dragomanov St., Lviv, 79005, Ukraine
| | - Valentina Balitska
- Lviv State University of Life Safety, 35, Kleparivska St., Lviv, 79007, Ukraine
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Yang J, Zhang T, Han LA, Cao XZ, Yu RS, Wang BY. The ability of the Coincidence Doppler Broadening Spectroscopy to characterize polymers containing different chemical elements. Spectrochim Acta A Mol Biomol Spectrosc 2017; 177:97-103. [PMID: 28131018 DOI: 10.1016/j.saa.2017.01.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/25/2016] [Accepted: 01/15/2017] [Indexed: 06/06/2023]
Abstract
Hydrocarbon polymers, O-containing, F-containing and Cl-containing polymers are comprehensively studied by Coincidence Doppler Broadening Spectroscopy (CDBS). It is shown that for polymers with different chemical structure, CDBS results can effectively distinguish polar groups CO, CCl, and CF. For polymers with similar chemical structure, the intensity of the element-specific peak in the CDBS ratio curve is dependent not only on the fraction of free positrons, but also on the content of characteristic atom in polymer repeated unit, and the polarity of the polymer molecule. For polymers containing several different polar groups, such as PCTFE (CF & CCl) and PFA (CF & CO), whether the element-specific peak appears or not depends on the amount of the polar groups and its positron capture ability. This work may provide insights into potential applications of CDBS for studying complex polymer systems.
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Affiliation(s)
- J Yang
- Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China.
| | - T Zhang
- Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China
| | - L A Han
- Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China
| | - X Z Cao
- Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China
| | - R S Yu
- Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China
| | - B Y Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China
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Klym H, Ingram A, Shpotyuk O, Hadzaman I, Solntsev V. Water-Vapor Sorption Processes in Nanoporous MgO-Al2O3 Ceramics: the PAL Spectroscopy Study. Nanoscale Res Lett 2016; 11:133. [PMID: 26956602 PMCID: PMC4783312 DOI: 10.1186/s11671-016-1352-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 03/01/2016] [Indexed: 06/05/2023]
Abstract
The water-vapor sorption processes in nanoporous MgO-Al2O3 ceramics are studied with positron annihilation lifetime (PAL) spectroscopy employing positron trapping and positronium (Ps)-decaying modes. It is demonstrated that the longest-lived components in the four-term reconstructed PAL spectra with characteristic lifetimes near 2 and 60-70 ns can be, respectively, attributed to ortho-positronium (o-Ps) traps in nanopores with 0.3- and 1.5-1.8-nm radii. The first o-Ps decaying process includes "pick-off" annihilation in the "bubbles" of liquid water, while the second is based on o-Ps interaction with physisorbed water molecules at the walls of the pores. In addition, the water vapor modifies structural defects located at the grain boundaries in a vicinity of pores, this process being accompanied by void fragmentation during water adsorption and agglomeration during water desorption after drying.
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Affiliation(s)
- Halyna Klym
- Lviv Polytechnic National University, 12 Bandera str., 79013, Lviv, Ukraine.
| | - Adam Ingram
- Physics Faculty of Opole University of Technology, 75 Ozimska str., 45370, Opole, Poland
| | - Oleh Shpotyuk
- Vlokh Institute of Physical Optics, 23 Dragoanova str., Lviv, 79005, Ukraine
- Institute of Physics of Jan Dlugosz University, 13/15 al. Armii Krajowej, Czestochowa, 42201, Poland
| | - Ivan Hadzaman
- Drohobych State Pedagogical University, I. Franko str., 24, Drohobych, 82100, Ukraine
| | - Viacheslav Solntsev
- V.E. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine, 41, Prospekt Nauki, 03680, Kiev, Ukraine
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10
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Shpotyuk O, Ingram A, Bujňáková Z, Baláž P, Shpotyuk Y. Probing Sub-atomistic Free-Volume Imperfections in Dry-Milled Nanoarsenicals with PAL Spectroscopy. Nanoscale Res Lett 2016; 11:10. [PMID: 26754936 PMCID: PMC4709335 DOI: 10.1186/s11671-016-1228-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Accepted: 01/05/2016] [Indexed: 05/04/2023]
Abstract
Structural transformations caused by coarse-grained powdering and fine-grained mechanochemical milling in a dry mode were probed in high-temperature modification of tetra-arsenic tetra-sulfide known as β-As4S4. In respect to X-ray diffraction analysis, the characteristic sizes of β-As4S4 crystallites in these coarse- and fine-grained powdered pellets were 90 and 40 nm, respectively. Positron annihilation lifetime spectroscopy was employed to characterize transformations occurred in free-volume structure of these nanoarsenicals. Experimentally measured positron lifetime spectra were parameterized in respect to three- or two-term fitting procedures and respectively compared with those accumulated for single crystalline realgar α-As4S4 polymorph. The effect of coarse-grained powdering was found to result in generation of large amount of positron and positronium Ps trapping sites inside arsenicals in addition to existing ones. In fine-grained powdered β-As4S4 pellets, the positron trapping sites with characteristic free volumes close to bi- and tri-atomic vacancies were evidently dominated. These defects were supposed to originate from grain boundary regions and interfacial free volumes near aggregated β-As4S4 crystallites. Thus, the cumulative production of different positron traps with lifetimes close to defect-related lifetimes in realgar α-As4S4 polymorph was detected in fine-grained milled samples.
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Affiliation(s)
- Oleh Shpotyuk
- Vlokh Institute of Physical Optics, 23, Dragomanov str., 79005, Lviv, Ukraine.
- Jan Dlugosz University, al. Armii Krajowej, 13/15, 42201, Czestochowa, Poland.
| | - Adam Ingram
- Opole University of Technology, 75, Ozimska str., 45370, Opole, Poland
| | - Zdenka Bujňáková
- Institute of Geotechnics of the Slovak Academy of Sciences, 45, Watsonova str., 04001, Košice, Slovakia
| | - Peter Baláž
- Institute of Geotechnics of the Slovak Academy of Sciences, 45, Watsonova str., 04001, Košice, Slovakia
| | - Yaroslav Shpotyuk
- Ivan Franko National University of Lviv, 107, Tarnavskogo str., 79017, Lviv, Ukraine
- Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, University of Rzeszow, 1, Pigonia str., 35-959, Rzeszow, Poland
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Shpotyuk O, Ingram A, Shpotyuk O. Free Volume Structure of Acrylic-Type Dental Nanocomposites Tested with Annihilating Positrons. Nanoscale Res Lett 2016; 11:528. [PMID: 27896790 PMCID: PMC5125314 DOI: 10.1186/s11671-016-1751-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 11/22/2016] [Indexed: 06/06/2023]
Abstract
Positron annihilation spectroscopy in lifetime measuring mode exploring conventional fast-fast coincidence ORTEC system is employed to characterize free volume structure of commercially available acrylic-type dental restorative composite Charisma® (Heraeus Kulzer GmbH, Germany). The measured lifetime spectra for uncured and light-cured composites are reconstructed from unconstrained x3-term fitting and semi-empirical model exploring x3-x2-coupling decomposition algorithm. The governing channel of positron annihilation in the composites studied is ascribed to mixed positron-Ps trapping, where Ps decaying in the third component is caused entirely by input from free-volume holes in polymer matrix, while the second component is defined by free positron trapping in interfacial free-volume holes between filler nanoparticles and surrounded polymer matrix. Microstructure scenario of the photopolymerization shrinkage includes cross-linking of structural chains in polymer matrix followed by conversion of bound positron-electron (positronium) traps in positron-trapping interfacial free-volume voids in a vicinity of agglomerated filler nanoparticles.
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Affiliation(s)
- Olha Shpotyuk
- Danylo Halytsky Lviv National Medical University, 69, Pekarska str., Lviv, 79010, Ukraine.
| | - Adam Ingram
- Opole University of Technology, 75, Ozimska str., 45370, Opole, Poland
| | - Oleh Shpotyuk
- Jan Dlugosz University in Czestochowa, 13/15, Armii Krajowej str., 42200, Czestochowa, Poland
- Vlokh Institute of Physical Optics, 23, Dragomanov str., Lviv, 79005, Ukraine
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Chamerski K, Lesniak M, Sitarz M, Stopa M, Filipecki J. An investigation of the effect of silicone oil on polymer intraocular lenses by means of PALS, FT-IR and Raman spectroscopies. Spectrochim Acta A Mol Biomol Spectrosc 2016; 167:96-100. [PMID: 27261889 DOI: 10.1016/j.saa.2016.05.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 05/22/2016] [Indexed: 06/05/2023]
Abstract
The effect of the polydimethylsiloxane (PDMS) based silicone oil, that is widely used in vitreoretinal surgery, on internal structures of the polymer intraocular lenses was investigated. The effect of PDMS was studied on the polymethyl methacrylate (PMMA) rigid lenses and poly(2-hydroxyethyl methacrylate) (PHEMA) flexible lenses. The research was carried out by means of the positron lifetime spectroscopy (PALS) as well as the infrared spectroscopy (FT-IR) and the Raman spectroscopy (RS). The studies involving the use of PALS and FT-IR methods have revealed that the PHEMA based lenses absorbed, whereas the PMMA lenses did not absorb, silicone oil. The results obtained with the use of the RS method were inconclusive, probably due to the too low intensity of the characteristic PDMS bands. The evidence from this study was discussed in terms of physics and related to the clinical use of both silicone oil and intraocular lenses.
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Affiliation(s)
- Kordian Chamerski
- Jan Dlugosz University, Faculty of Mathematics and Natural Science, Institute of Physics, Al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland
| | - Magdalena Lesniak
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
| | - Maciej Sitarz
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
| | - Marcin Stopa
- Department of Optometry and Biology of Visual System, Poznan University of Medical Sciences, ul. Rokietnicka 5D, 60-806 Poznań, Poland; Clinical Eye Unit and Pediatric Ophthalmology Service, Heliodor Swiecicki University Hospital, Poznan University of Medical Sciences, Poznań, Poland
| | - Jacek Filipecki
- Jan Dlugosz University, Faculty of Mathematics and Natural Science, Institute of Physics, Al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland.
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Shpotyuk O, Bujňáková Z, Baláž P, Ingram A, Shpotyuk Y. Positron annihilation lifetime study of polyvinylpyrrolidone for nanoparticle-stabilizing pharmaceuticals. J Pharm Biomed Anal 2015; 117:419-25. [PMID: 26444751 DOI: 10.1016/j.jpba.2015.09.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/24/2015] [Accepted: 09/25/2015] [Indexed: 11/24/2022]
Abstract
Positron annihilation lifetime spectroscopy was applied to characterize free-volume structure of polyvinylpyrrolidone used as nonionic stabilizer in the production of many nanocomposite pharmaceuticals. The polymer samples with an average molecular weight of 40,000 g mol(-1) were pelletized in a single-punch tableting machine under an applied pressure of 0.7 GPa. Strong mixing in channels of positron and positronium trapping were revealed in the polyvinylpyrrolidone pellets. The positron lifetime spectra accumulated under normal measuring statistics were analysed in terms of unconstrained three- and four-term decomposition, the latter being also realized under fixed 0.125 ns lifetime proper to para-positronium self-annihilation in a vacuum. It was shown that average positron lifetime extracted from each decomposition was primary defined by long-lived ortho-positronium component. The positron lifetime spectra treated within unconstrained three-term fitting were in obvious preference, giving third positron lifetime dominated by ortho-positronium pick-off annihilation in a polymer matrix. This fitting procedure was most meaningful, when analysing expected positron trapping sites in polyvinylpyrrolidone-stabilized nanocomposite pharmaceuticals.
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Affiliation(s)
- O Shpotyuk
- Institute of Physics of Jan Dlugosz University in Czestochowa, 13/15, Al. Armii Krajowej, Czestochowa 42200, Poland; Vlokh Institute of Physical Optics, 23, Dragomanov Str., Lviv 79005, Ukraine.
| | - Z Bujňáková
- Institute of Geotechnics of Slovak Academy of Sciences, 45, Watsonova Str., Košice 04001, Slovakia
| | - P Baláž
- Institute of Geotechnics of Slovak Academy of Sciences, 45, Watsonova Str., Košice 04001, Slovakia
| | - A Ingram
- Opole University of Technology, 75, Ozimska Str., Opole 45370, Poland
| | - Y Shpotyuk
- Ivan Franko National University of Lviv, 1, Universytetska Str., 79000 Lviv, Ukraine; Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, University of Rzeszow, 1, Pigonia Str., 35959 Rzeszow, Poland
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Mahmoud KR, Khodair AI, Shaban SY. Positron annihilation lifetime studies of changes in free volume on some biorelevant nitrogen heterocyclic compounds and their S-glycosylation. Appl Radiat Isot 2015; 105:303-307. [PMID: 26272166 DOI: 10.1016/j.apradiso.2015.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 06/27/2015] [Accepted: 07/01/2015] [Indexed: 11/30/2022]
Abstract
A series of N-heterocyclic compounds was investigated by positron annihilation lifetime spectroscopy as well as Doppler broadening of annihilation radiation (DBAR) at room temperature. The results showed that the formation probability and life time of ortho-positronium in this series are structure and electron-donation character dependent, and can give more information about the structure. The DBAR provides direct information about the change of core and valance electrons as well as the number of defect types present in these compounds.
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Affiliation(s)
- K R Mahmoud
- Physics Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt.
| | - A I Khodair
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt
| | - S Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt
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Klym H, Ingram A, Shpotyuk O, Calvez L, Petracovschi E, Kulyk B, Serkiz R, Szatanik R. 'Cold' crystallization in nanostructurized 80GeSe2-20Ga2Se3 glass. Nanoscale Res Lett 2015; 10:49. [PMID: 25852346 PMCID: PMC4385280 DOI: 10.1186/s11671-015-0775-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 01/21/2015] [Indexed: 06/04/2023]
Abstract
'Cold' crystallization in 80GeSe2-20Ga2Se3 chalcogenide glass nanostructurized due to thermal annealing at 380°C for 10, 25, 50, 80, and 100 h are probed with X-ray diffraction, atomic force, and scanning electron microscopy, as well as positron annihilation spectroscopy performed in positron annihilation lifetime and Doppler broadening of annihilation line modes. It is shown that changes in defect-related component in the fit of experimental positron lifetime spectra for nanocrystallized glasses testify in favor of structural fragmentation of larger free-volume entities into smaller ones. Nanocrystallites of Ga2Se3 and/or GeGa4Se8 phases and prevalent GeSe2 phase extracted mainly at the surface of thermally treated samples with preceding nucleation and void agglomeration in the initial stage of annealing are characteristic features of cold crystallization.
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Affiliation(s)
- Halyna Klym
- />Lviv Polytechnic National University, 12 Bandera str, Lviv, 79013 Ukraine
| | - Adam Ingram
- />Physics Faculty of Opole University of Technology, 75 Ozimska str, Opole, 45370 Poland
| | - Oleh Shpotyuk
- />Lviv Institute of Materials of SRC ‘Carat’, 202 Stryjska str, Lviv, 79031 Ukraine
- />Institute of Physics of Jan Dlugosz University, 13/15 al. Armii Krajowej, Czestochowa, 42201 Poland
| | - Laurent Calvez
- />Equipe Verres et et Céramiques, UMR-CNRS 6226, Institute des Sciences chimiques de Rennes, Université de Rennes 1, Rennes, Cedex 35042 France
| | - Elena Petracovschi
- />Equipe Verres et et Céramiques, UMR-CNRS 6226, Institute des Sciences chimiques de Rennes, Université de Rennes 1, Rennes, Cedex 35042 France
| | - Bohdan Kulyk
- />Ivan Franko National University of Lviv, 1 Universytetska str, Lviv, 79000 Ukraine
| | - Roman Serkiz
- />Ivan Franko National University of Lviv, 1 Universytetska str, Lviv, 79000 Ukraine
| | - Roman Szatanik
- />Opole University, 11a Kopernika sq, Opole, 45040 Poland
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Filipecki J, Sitarz M, Kocela A, Kotynia K, Jelen P, Filipecka K, Gaweda M. Studying functional properties of hydrogel and silicone-hydrogel contact lenses with PALS, MIR and Raman spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2014; 131:686-690. [PMID: 24929503 DOI: 10.1016/j.saa.2014.04.144] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 03/31/2014] [Accepted: 04/23/2014] [Indexed: 06/03/2023]
Abstract
Determination of free volume holes of the hydrogel and silicone-hydrogel polymer contact lenses were investigated. Two types of polymer contact lenses were used as materials: the first is a hydrogel contact lenses Proclear family (Omafilcon A), while the second is a silicone-hydrogel contact lens of the family Biofinity (Comfilcon A). Positron annihilation lifetime spectroscopy PALS was used to characterize geometrical sizes and fraction of the free volume holes in the investigated samples. There is a clear difference in the free volume sizes and their fractions between silicone-hydrogel and polymer hydrogel contact lenses which in turn are connected with oxygen permeability in these lenses. Apart from that, spectroscopic (middle infrared) MIR and Raman examinations were carried out in order to demonstrate the differences of the water content in the test contact lenses.
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Affiliation(s)
- J Filipecki
- Institute of Physics, Jan Dlugosz University, Al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland.
| | - M Sitarz
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
| | - A Kocela
- Institute of Physics, Jan Dlugosz University, Al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland
| | - K Kotynia
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
| | - P Jelen
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
| | - K Filipecka
- Institute of Physics, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Czestochowa, Poland
| | - M Gaweda
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Cracow, Poland
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Würschum R, Oberdorfer B, Steyskal EM, Sprengel W, Puff W, Pikart P, Hugenschmidt C, Pippan R. Free volumes in bulk nanocrystalline metals studied by the complementary techniques of positron annihilation and dilatometry. Physica B Condens Matter 2012; 407:2670-2675. [PMID: 23471443 PMCID: PMC3587340 DOI: 10.1016/j.physb.2012.01.090] [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] [Indexed: 06/01/2023]
Abstract
Free-volume type defects, such as vacancies, vacancy-agglomerates, dislocations, and grain boundaries represent a key parameter in the properties of ultrafine-grained and nanocrystalline materials. Such free-volume type defects are introduced in high excess concentration during the processes of structural refinement by severe plastic deformation. The direct method of time-differential dilatometry is applied in the present work to determine the total amount and the kinetics of free volume by measuring the irreversible length change upon annealing of bulk nanocrystalline metals (Fe, Cu, Ni) prepared by high-pressure torsion (HPT). In the case of HPT-deformed Ni and Cu, distinct substages of the length change upon linear heating occur due to the loss of grain boundaries in the wake of crystallite growth. The data on dilatometric length change can be directly related to the fast annealing of free-volume type defects studied by in situ Doppler broadening measurements performed at the high-intensity positron beam of the FRM II (Garching, Munich, Germany).
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Affiliation(s)
- Roland Würschum
- Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Bernd Oberdorfer
- Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Eva-Maria Steyskal
- Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Wolfgang Sprengel
- Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Werner Puff
- Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Philip Pikart
- Physics Department E 21 and FRM II, Technical University Munich, D-85747 Garching, Germany
| | - Christoph Hugenschmidt
- Physics Department E 21 and FRM II, Technical University Munich, D-85747 Garching, Germany
| | - Reinhard Pippan
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Austria
- Department Materials Physics, University of Leoben, A-8700 Leoben, Austria
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