© Published under licence by IOP Publishing Ltd. Structural characterization of asphaltenes in complex systems is in the focus of scientific and industrial interests since many years. Asphaltenes isolated from the high-viscous Ashal'cha oil (2500 mPa•s) were studied. Five asphaltene fractions were obtained by stepwise extraction with an alcohol-benzene solvent with different alcohol contents after precipitating the asphaltenes from the oil with hot isooctane. Redistribution of paramagnetic centers between the fractions of asphaltenes is revealed by electron paramagentic resonance (EPR) while no significant changes in EPR spectral parameters are found. The results can be used for tracking the asphatenes formation as well as following the cha...
© 2019 Marat Gafurov et al. Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oi...
Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films ob...
The electron paramagnetic resonance (EPR) technique is used to evaluate the temperature dependence o...
© Published under licence by IOP Publishing Ltd. Structural characterization of asphaltenes in compl...
The electron paramagnetic resonance (EPR) technique was used to study the behavior of the asphaltene...
International audienceThe potential of electron paramagnetic resonance (EPR) spectroscopy to provide...
© 2016 American Chemical Society.A series of 12 asphaltene samples extracted from heavy oils and the...
©2014 American Chemical Society. The structural properties of crude oils and asphaltenes, especially...
© 2018 Elsevier B.V. Temperature dependencies of electron paramagnetic resonance spectra of intrinsi...
© Published under licence by IOP Publishing Ltd. Structural characterization of asphaltenes in compl...
© 2018 Institute of Physics Publishing. All rights reserved. Structural characterization of metallop...
A series of 12 asphaltene samples extracted from heavy oils and the oxidized bitumen of different or...
The purpose of this work is to analyze the electron–nuclear interactions of the vanadyl-porphyrin (V...
The present paper is focused on the application of some of the multifrequency (9.5 and 94 GHz) conti...
The electron paramagnetic resonance (EPR) technique is used to evaluate the temperature dependence o...
© 2019 Marat Gafurov et al. Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oi...
Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films ob...
The electron paramagnetic resonance (EPR) technique is used to evaluate the temperature dependence o...
© Published under licence by IOP Publishing Ltd. Structural characterization of asphaltenes in compl...
The electron paramagnetic resonance (EPR) technique was used to study the behavior of the asphaltene...
International audienceThe potential of electron paramagnetic resonance (EPR) spectroscopy to provide...
© 2016 American Chemical Society.A series of 12 asphaltene samples extracted from heavy oils and the...
©2014 American Chemical Society. The structural properties of crude oils and asphaltenes, especially...
© 2018 Elsevier B.V. Temperature dependencies of electron paramagnetic resonance spectra of intrinsi...
© Published under licence by IOP Publishing Ltd. Structural characterization of asphaltenes in compl...
© 2018 Institute of Physics Publishing. All rights reserved. Structural characterization of metallop...
A series of 12 asphaltene samples extracted from heavy oils and the oxidized bitumen of different or...
The purpose of this work is to analyze the electron–nuclear interactions of the vanadyl-porphyrin (V...
The present paper is focused on the application of some of the multifrequency (9.5 and 94 GHz) conti...
The electron paramagnetic resonance (EPR) technique is used to evaluate the temperature dependence o...
© 2019 Marat Gafurov et al. Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oi...
Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films ob...
The electron paramagnetic resonance (EPR) technique is used to evaluate the temperature dependence o...