zhpsЖурнал прикладной спектроскопииZhurnal Prikladnoii Spektroskopii0514-7506B. I. Stepanov Institute of Physics of the National Academy of Scienceszhps-988Research ArticleАННОТАЦИИ АНГЛОЯЗЫЧНЫХ СТАТЕЙABSTRACTS ENGLISH-LANGUAGE ARTICLESОпределение молекулярной подвижности сырой нефти с помощью электронного парамагнитного резонанса свободных радикаловMolecular Mobility of Crude Oils via Electron Paramagnetic Resonance of Organic Free RadicalsKhanA.KhanA.

Лондрина

Londrina

ValeziD. F.ValeziD. F.

Лондрина

Londrina

PicinatoM. T.PicinatoM. T.

Лондрина

Londrina

VicentinB. L. S.VicentinB. L. S.

Лондрина

Londrina

bruno.vicentin@uel.brNettoA. M.NettoA. M.

СП

SP

MantovaniA. C. G.MantovaniA. C. G.

Лондрина

Londrina

Di MauroE.Di MauroE.

Лондрина

Londrina

Университет Лондрины (UEL)Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)Университет Лондрины (UEL); Федеральный технологический университет Параны (UTFPR)Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL); Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná (UTFPR)Braskem S.A. Сан-ПаулуBraskem S.A. São Paulo202204022022891138143Copyright © Khan A., Valezi D.F., Picinato M.T., Vicentin B.S., Netto A.M., Mantovani A.G., Di Mauro E., 20222022Khan A., Valezi D.F., Picinato M.T., Vicentin B.S., Netto A.M., Mantovani A.G., Di Mauro E.Khan A., Valezi D.F., Picinato M.T., Vicentin B.S., Netto A.M., Mantovani A.G., Di Mauro E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://zhps.ejournal.by/jour/article/view/988

С использованием ширины линии сигнала электронного парамагнитного резонанса (ЭПР) свободных радикалов в качестве зонда молекулярной подвижности изучена молекулярная подвижность сырой нефти. С помощью спектроскопии ЭПР, ЯМР и реометрии проанализированы образцы ароматической и парафиновой сырой нефти. Изменения ширины линии на полувысоте в зависимости от температуры демонстрируют сходное поведение для обоих образцов, что связано с различными режимами молекулярной подвижности. Результаты ЭПР по изменению вязкости в зависимости от температуры сравнивались с полученными с помощью реометрии и ЯМР. Отмечена тенденция к снижению вязкости парафинового образца при температуре, близкой к диапазону, в котором наблюдается переход из твердого состояния в жидкое при анализе ЭПР. Методика ЭПР позволяет получить более подробные данные об изменении состояния исследуемых образцов нефти, которые согласуются с полученными с помощью реометрии и ЯМР.

This study aimed to investigate the molecular mobility of crude oils using the linewidth of the free radical electron paramagnetic resonance signal (EPR) as a molecular mobility probe. For this, aromatic and paraffinic crude oil samples were analyzed by X-band EPR spectroscopy, NMR experiments in time domain (TD-NMR), and rheometry. The variations on the half height linewidth with temperature presented a similar behavior for both samples, being related to different molecular mobility regimes. EPR results were compared to the variation of viscosity with temperature obtained by rheometry and TD-NMR. The results showed changes in the decrease trend of viscosity for the paraffinic sample at a temperature close to the range in which it is observed the transition from rigid to liquid regime in the EPR analysis. EPR technique showed more detailed information about the regime transition for the oil samples studied, which is in agreement with the results obtained by rheometry and TD-NMR.

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The authors declare that there are no conflicts of interest present.