Abstract
The Nuclear Magnetic Resonance signals of coal can be enhanced to an appreciable amount by means of Dynamic Nuclear Polarization (DNP).
A brief outline is given of the three possible mechanisms, namely the Overhauser, Solid State and Thermal Mixing effect. The H and 13C DNP enhancement PH respectively PC have been investigated of 32 coal samples with a volatile matter percentage between 7 and 60%. The results are: (i) At high microwave powers (8W) PH is mainly governed by the Solid State effect, whereas PC is determined by a combination of the Solid State and Thermal Mixing effect; (ii) Both PH and PC decrease with decreasing coal rank, and become close to unity when VM% > 45%. The use of DNP in 13C spectroscopy in coal has been investigated and examples of applications are given.
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Wind, R.A., Duijvestijn, M.J., Lugt, C.V.D., Smidt, J., Vriend, J. (1984). Applications of Dynamic Nuclear Polarization in Coal Research. In: Petrakis, L., Fraissard, J.P. (eds) Magnetic Resonance. NATO ASI Series, vol 124. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6378-8_17
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DOI: https://doi.org/10.1007/978-94-009-6378-8_17
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