Czasopismo
Tytuł artykułu
Warianty tytułu
Języki publikacji
Abstrakty
Two-temperature electron paramagnetic resonance (EPR) measurements, applied to determine the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, were carried out. The measurements were made on the macerals – exinite and vitrinite, separated from clarain of the Polish medium-rank coal (85.6 wt% C). The two-temperature EPR measurements, presented in this work, were performed respectively, at temperatures: T1 = 293 K and T2 = 173 K for exinite, and T1 = 293 K and T2 = 153 K for vitrinite. The relative contributions X of spins not-fulfilling the Curie law present in the studied macerals were calculated. A comparison of different methods of calculating the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, present in exinite and vitrinite studied by EPR was made.
Czasopismo
Rocznik
Tom
Numer
Strony
389-393
Opis fizyczny
Daty
wydano
2015-07-01
otrzymano
2014-10-01
zaakceptowano
2015-01-30
online
2015-08-06
Twórcy
autor
- Institute of Physics, Faculty of Physics and Astronomy, University of Zielona Góra, 4a Szafrana Str., 65-516 Zielona Góra, Poland, grzegslowik@o2.pl
autor
- Institute of Physics, Faculty of Physics and Astronomy, University of Zielona Góra, 4a Szafrana Str., 65-516 Zielona Góra, Poland and Institute of Molecular Physics of the Polish Academy of Sciences, 17 Smoluchowskiego Str., 60-179 Poznań, Poland
Bibliografia
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- 3. Pilawa, B. (2000). Evolution of paramagnetic centers during thermal decomposition of coal macerals. Habilitation thesis, Pedagogical University, Zielona Góra, Poland.
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- 6. Więckowski, A. B., Pilawa, B., Świątkowska, L., Wojtowicz, W., Słowik, G. P., & Lewandowski, M. (2000). Thermally excited multiplet states in macerals separated from bituminous coal. J. Magn. Reson., 145(1), 62–72. DOI: 10.1006/jmre.2000.2044.[Crossref]
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- 8. Słowik, G. P., Wojtowicz, W., & Więckowski, A. B. (2005). EPR evidence for thermally excited triplet states in exinite, vitrinite and inertinite separated from bituminous coal. Acta Phys. Pol. A, 108(1), 171–176. .
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- 12. Najder-Kozdrowska, L., Pilawa, B., Buszman, E., Więckowski, A. B., Świątkowska, L., Wrześniok, D., & Wojtowicz, W. (2010). Triplet states in DOPA-melanin and in its complexes with kanamycin and copper Cu(II) ions. Acta Phys. Pol. A, 118(4), 613–618. .
- 13. Bleaney, B., & Bowers, K. D. (1952). Anomalous paramagnetism of copper acetate. Proc. Roy. Soc. A-Math. Phys. Eng. Sci., 214(1119), 451–465. DOI: 10.1098/rspa.1952.0181.[Crossref]
- 14. Gong, D., & Yang, H. (2013). The discovery of free radicals in ancient silk textiles. Polym. Degrad. Stabil., 98(9), 1780–1783. DOI: 10.1016/j.polymdegradstab.2013.05.011.[WoS][Crossref]
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_1515_nuka-2015-0069