2019
DOI: 10.1155/2019/3812875
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High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface

Abstract: Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 95 GHz, magnetic field of 3.4 T). Mims ENDOR spectra from 1H and 27Al nuclei are observed. ENDOR spectra are different for native oil and asphaltenes from one side and the adsorbed samples from t… Show more

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Cited by 13 publications
(10 citation statements)
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“…For example, NV fluorescent centers could be studied by optically detected magnetic resonance; further radiation damage centers or impurity may be created inside the diamond to introduce additional paramagnetic markers into the structure of nanoparticle. From the other hand, the presented results can be used for the investigation of adsorption of magnetic nuclei-containing substances that may be important to study supramolecular structures of oil asphaltenes and reaction of polymerization in the conditions of spatial/quantum confinement for using ND as catalysts …”
Section: Discussionmentioning
confidence: 99%
“…For example, NV fluorescent centers could be studied by optically detected magnetic resonance; further radiation damage centers or impurity may be created inside the diamond to introduce additional paramagnetic markers into the structure of nanoparticle. From the other hand, the presented results can be used for the investigation of adsorption of magnetic nuclei-containing substances that may be important to study supramolecular structures of oil asphaltenes and reaction of polymerization in the conditions of spatial/quantum confinement for using ND as catalysts …”
Section: Discussionmentioning
confidence: 99%
“…Some 1–2% of asphaltene molecules contain organic radicals. , Recently, a consortium of academic and industrial researchers postulated that these radicals solve the “puzzle” of asphaltene aggregation . One proposed mechanism involves half-pancake bonds between radical and nonradical PAH.…”
Section: Introductionmentioning
confidence: 99%
“…The relatively low concentration of radicals in asphaltene , rules out pancake bonds between radicals as a major source of aggregation, as the formation of pancake bonds would require the radicals to find each other consistently. Reference instead postulated “half-pancake” bonds between a radical PAH and a nonradical PAH.…”
Section: Introductionmentioning
confidence: 99%
“…Elucidation of the petroporphyrin structure by ultrahigh-resolution mass spectrometry and atomic force microscopy could shed light on the processes occurring during oil formation and maturation. Study of petroporphyrin contribution to asphaltene aggregation behavior through electron and electron-nuclear double paramagnetic resonance, , electronic spectroscopy, , small-angle neutron scattering, , size-exclusion chromatography, etc. could provide better insights into the nature of asphaltene–petroporphyrin and asphaltene–asphaltene interactions.…”
Section: Introductionmentioning
confidence: 99%