19F dynamic nuclear polarization and sem in suspensions consisting of fluorobenzene derivatives and asphaltene extracted from mc-800 liquid asphalt
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Date
2013-01-10
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Taylor & Francis Inc
Abstract
A variety of analytical techniques, such as scanning electron microscopy and F-19 dynamic nuclear polarization (DNP) methods, are applied to characterize asphaltene extracted from MC-800 liquid asphalt in fluorobenzene derivatives at 1.53mT and at room temperature. Different solvents show variable affinities for the asphaltene surface. The low field EPR spectrum of the asphaltene/hexafluorobenzene sample was recorded. The DNP parameters were determined. Additionally, the interactions between the nuclei of the solvent and the electrons delocalized on the asphaltene are interpreted. Not only dipolar but also scalar interactions between the nuclear spin and the electron spin were found.
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Keywords
Asphaltene, SEM, DNP, Intermolecular spin-spin interaction, EPR, Highly fluorinated solutions, Electron double-resonance, Petroleum, Free-radical solutions, Relaxation, Une nouvelle methode, Dnp aggregation, State, Field, Asphalt, Spin polarization, Electron spin resonance spectroscopy, Spin dynamics, Liquids, Scanning electron microscopy, Magnetic moments, Paramagnetic resonance, Chemistry
Citation
Kırımlı, H. ve Ovalioǧlu, H. (2013). "19F dynamic nuclear polarization and sem in suspensions consisting of fluorobenzene derivatives and asphaltene extracted from mc-800 liquid asphalt". Journal of Dispersion Science and Technology, 35(2), 255-264.