Molecular Diffusion and DNP Enhancement in Aqueous Char Suspensions

Odintsov, B. M.; Belford, R. Linn; Ceroke, P.J.; Idiyatullin, Z. Sh.; Kashaev, R. S.; Kuriashkin, Igor V.; Rukhlov, V. S.; Temnikov, A.N.; Clarkson, R. B.

doi:10.1006/jmre.1998.1600

Cited by 11 publications

(5 citation statements)

References 29 publications

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“…Other applications include the analysis of aqueous char suspensions, which contain inherent paramagnetic species that can be used to provide the source of hyperpolarisation. 8 Recently it has been demonstrated that DNP-generated hyperpolarisation can be created in the solid state and successfully transferred to the liquid state for detection at high resolution, using a novel sample transfer system. 1 -3 In this article we present an extension of the DNP method developed by Ardenkjaer-Larsen and co-workers.…”

Section: Introductionmentioning

confidence: 99%

Co‐acquisition of hyperpolarised ¹³C and ¹⁵N NMR spectra

Day

Mitchell

Snowden

et al. 2007

Magnetic Reson in Chemistry

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Recent developments in dynamic nuclear polarisation now allow significant enhancements to be generated in the cryo solid state and transferred to the liquid state for detection at high resolution. We demonstrate that the Ardenkjaer-Larsen method can be extended by taking advantage of the properties of the trityl radicals used. It is possible to hyperpolarise 13C and 15N simultaneously in the solid state, and to maintain these hyperpolarisations through rapid dissolution into the liquid state. We demonstrate the almost simultaneous measurement of hyperpolarised 13C and hyperpolarised 15N NMR spectra. The prospects for further improvement of the method using contemporary technology are also discussed.

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Section: Introductionmentioning

confidence: 99%

Co‐acquisition of hyperpolarised ¹³C and ¹⁵N NMR spectra

Day

Mitchell

Snowden

et al. 2007

Magnetic Reson in Chemistry

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“…The standard deviation of the particle diameter for any sample was less than 20%. Experimental details of char synthesis are described elsewhere (1,17).…”

Section: Methodsmentioning

confidence: 99%

Peculiarities in the Water Adsorption and Morphology of Carbon Chars Assessed by NMR

Odintsov

Temnikov

Belford

et al. 2001

Journal of Colloid and Interface Science

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“…The spectral density functions depend on the details of the molecular motions that render the electronnuclear interactions time dependent. Examples of such motions are the translational and rotational diffusion of the liquid molecules, rotations of possible liquid-radical complexes, inelastic and elastic collisions between the liquid and radical molecules, and, in case nondissolved solid radicals are used, exchange effects on the liquid/solid interfaces (12,14,16,(23)(24)(25)(26). Which of these motions dominates in the coupling factor depends on the electron Larmor frequency e and, henceforth, on the value of the external field.…”

Section: Dynamic Nuclear Polarizationmentioning

confidence: 98%