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Pregled bibliografske jedinice broj: 949085

Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs


Šaric, Iva; Jurec, Jurica; Reijerse, Edward; Maltar-Strmečki, Nadica; Rakvin, Boris; Kveder, Marina
Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs // Journal of physics and chemistry of solids, 123 (2018), 124-132 doi:10.1016/j.jpcs.2018.07.013 (međunarodna recenzija, članak, znanstveni)


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Naslov
Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs

Autori
Šaric, Iva ; Jurec, Jurica ; Reijerse, Edward ; Maltar-Strmečki, Nadica ; Rakvin, Boris ; Kveder, Marina

Izvornik
Journal of physics and chemistry of solids (0022-3697) 123 (2018); 124-132

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Trehalose ; Irradiation ; Multi-frequency EPR ; Glassy state

Sažetak
Electron paramagnetic resonance (EPR) studies of the radiation-induced radicals in two anhydrous trehalose polymorphs, beta- crystalline (TREc) and glassy (TREg), were conducted with the aim to resolve whether different types of free radicals are induced in a differently disordered environment. A multifrequency approach (9.5 GHz, 94 GHz, and 244 GHz) was applied to improve the resolution of the complex EPR spectra. In addition, the thermal stability of the EPR spectra and the respective decay kinetics were analyzed in a series of thermal annealing studies in the temperature interval from 333 K to 363 K. It was found that in the crystalline matrix the transformation process of the induced radicals is more complex than in the glassy host matrix. Qualitative decomposition of the experimental spectra, assuming four contributing species, reproduced characteristic EPR spectral features in both matrices. These were interpreted as carbon-centered radicals while the possibility of the formation of alkoxy radicals due to the abstraction of a hydrogen atom could be ruled out. Only in one case, the tentative assignment of the EPR spectral components revealed the formation of the same radical species in both TREc and TREg. Furthermore, by thermal annealing TREg lost one of the radical species, whereas in TREc all 4 radical species pertained irrespective of the treatment. The results presented here, therefore, provide experimental evidence that the extent of disorder present in the material strongly affects the type and stability of radicals induced by ionizing radiation.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Erratum s izmjenjenim autorima: https://doi.org/10.1016/j.jpcs.2018.12.018



POVEZANOST RADA


Projekti:
HRZZ-IP-2013-11-1108 - Karakterizacija niskotemperaturne molekulske dinamike sustava s neuređenom rešetkom metodom ESR (DESiRe) (Ilakovac Kveder, Marina, HRZZ - 2013-11) ( POIROT)

Ustanove:
Institut "Ruđer Bošković", Zagreb,
Sveučilište u Rijeci - Odjel za fiziku

Citiraj ovu publikaciju

Šaric, Iva; Jurec, Jurica; Reijerse, Edward; Maltar-Strmečki, Nadica; Rakvin, Boris; Kveder, Marina
Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs // Journal of physics and chemistry of solids, 123 (2018), 124-132 doi:10.1016/j.jpcs.2018.07.013 (međunarodna recenzija, članak, znanstveni)
Šaric, I., Jurec, J., Reijerse, E., Maltar-Strmečki, N., Rakvin, B. & Kveder, M. (2018) Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs. Journal of physics and chemistry of solids, 123, 124-132 doi:10.1016/j.jpcs.2018.07.013.
@article{article, year = {2018}, pages = {124-132}, DOI = {10.1016/j.jpcs.2018.07.013}, keywords = {Trehalose, Irradiation, Multi-frequency EPR, Glassy state}, journal = {Journal of physics and chemistry of solids}, doi = {10.1016/j.jpcs.2018.07.013}, volume = {123}, issn = {0022-3697}, title = {Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs}, keyword = {Trehalose, Irradiation, Multi-frequency EPR, Glassy state} }
@article{article, year = {2018}, pages = {124-132}, DOI = {10.1016/j.jpcs.2018.07.013}, keywords = {Trehalose, Irradiation, Multi-frequency EPR, Glassy state}, journal = {Journal of physics and chemistry of solids}, doi = {10.1016/j.jpcs.2018.07.013}, volume = {123}, issn = {0022-3697}, title = {Impact of disorder on formation of free radicals by gamma-irradiation: Multi-frequency EPR studies of trehalose polymorphs}, keyword = {Trehalose, Irradiation, Multi-frequency EPR, Glassy state} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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