mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-187Research ArticleСтатьиThe characterization of asphaltenes by 1H NMR relaxation method: microsecond range of spin-spin relaxation timesShkalikovN. V.

Kazan 420008

Nikolay.Shkalikov@ksu.ruGaneevaYu. M.

Kazan 420088

YusupovaT. N.

Kazan 420088

SkirdaV. D.

Kazan 420008

Kazan State UniversityRussian FederationInstitute of Organic and Physical Chemistry, Russian Academy of SciencesRussian Federation2008200120241011119Copyright © Shkalikov N.V., Ganeeva Y.M., Yusupova T.N., Skirda V.D., 20242024Shkalikov N.V., Ganeeva Y.M., Yusupova T.N., Skirda V.D.Shkalikov N.V., Ganeeva Y.M., Yusupova T.N., Skirda V.D.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/187

The asphaltene powders have been studied by 1H NMR relaxation method, differential scanning calorimetry (DSC) and X-ray structure analysis. The asphaltene samples were extracted from three oils with different component and hydrocarbon-group compositions. It was found that free induction decays (FID) of various asphaltene samples contain Gaussian component with spin-spin relaxation times T2 about 10?20 μs, which was named a solid component. The detecting possibilities of equilibrium first-order phase transitions and non-equilibrium glass-transitions on temperature dependence of part Ps of solid component in the 1H NMR signal are presented. The 1H NMR relaxation and DSC methods to study temperature properties of asphaltenes are compared. The glass-transition temperatures of side aliphatic chains of asphaltene molecules are measured. We set up that crystallization of high-molecular side aliphatic chains of asphaltene molecules is possible.

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