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A multiple-field Na-23 NMR study of sodium species in porous carbons

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A multiple-field Na-23 NMR study of sodium species in porous carbons. / Freitas, Jair C. C.; Schettino, Miguel A.; Emmerich, Francisco G. et al.
In: Solid State Nuclear Magnetic Resonance, Vol. 32, No. 4, 01.12.2007, p. 109-117.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Freitas, JCC, Schettino, MA, Emmerich, FG, Wong, A & Smith, ME 2007, 'A multiple-field Na-23 NMR study of sodium species in porous carbons', Solid State Nuclear Magnetic Resonance, vol. 32, no. 4, pp. 109-117. https://doi.org/10.1016/j.ssnmr.2007.10.002

APA

Freitas, J. C. C., Schettino, M. A., Emmerich, F. G., Wong, A., & Smith, M. E. (2007). A multiple-field Na-23 NMR study of sodium species in porous carbons. Solid State Nuclear Magnetic Resonance, 32(4), 109-117. https://doi.org/10.1016/j.ssnmr.2007.10.002

Vancouver

Freitas JCC, Schettino MA, Emmerich FG, Wong A, Smith ME. A multiple-field Na-23 NMR study of sodium species in porous carbons. Solid State Nuclear Magnetic Resonance. 2007 Dec 1;32(4):109-117. doi: 10.1016/j.ssnmr.2007.10.002

Author

Freitas, Jair C. C. ; Schettino, Miguel A. ; Emmerich, Francisco G. et al. / A multiple-field Na-23 NMR study of sodium species in porous carbons. In: Solid State Nuclear Magnetic Resonance. 2007 ; Vol. 32, No. 4. pp. 109-117.

Bibtex

@article{c57dd5ca42a04f5992a2fb912be2d6d0,
title = "A multiple-field Na-23 NMR study of sodium species in porous carbons",
abstract = "The sodium environments in porous carbon materials prepared from NaOH activation of a char were investigated by means of multiple-field solid-state Na-23 NMR measurements, carried out at magnetic fields of 4.7, 8.45 and 14.1 T, with single-pulse excitation and magic angle spinning (MAS). The recorded spectra showed a relatively featureless resonance with linewidth and peak shift strongly dependent on the magnetic field strength and on the hydration level of the samples. The existence of second-order quadrupolar effects was inferred, although the structural disorder and the mobile character associated with the Na environment precluded the direct observation of typical quadrupolar features in the MAS NMR spectra. The analysis of the spectra collected at multiple magnetic fields yielded the values of -2.8 ppm for the isotropic chemical shift and 1.8 MHz for the quadrupole coupling constant, which were interpreted as due to Na+ ions bonded to oxygenated groups at the edges of the graphene planes within the carbon pore network.",
keywords = "activated carbon, nuclear magnetic resonance, chemical structure, Na-23 NMR, multiple magnetic fields",
author = "Freitas, {Jair C. C.} and Schettino, {Miguel A.} and Emmerich, {Francisco G.} and Alan Wong and Smith, {Mark E.}",
year = "2007",
month = dec,
day = "1",
doi = "10.1016/j.ssnmr.2007.10.002",
language = "English",
volume = "32",
pages = "109--117",
journal = "Solid State Nuclear Magnetic Resonance",
issn = "1527-3326",
publisher = "ACADEMIC PRESS INC ELSEVIER SCIENCE",
number = "4",

}

RIS

TY - JOUR

T1 - A multiple-field Na-23 NMR study of sodium species in porous carbons

AU - Freitas, Jair C. C.

AU - Schettino, Miguel A.

AU - Emmerich, Francisco G.

AU - Wong, Alan

AU - Smith, Mark E.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - The sodium environments in porous carbon materials prepared from NaOH activation of a char were investigated by means of multiple-field solid-state Na-23 NMR measurements, carried out at magnetic fields of 4.7, 8.45 and 14.1 T, with single-pulse excitation and magic angle spinning (MAS). The recorded spectra showed a relatively featureless resonance with linewidth and peak shift strongly dependent on the magnetic field strength and on the hydration level of the samples. The existence of second-order quadrupolar effects was inferred, although the structural disorder and the mobile character associated with the Na environment precluded the direct observation of typical quadrupolar features in the MAS NMR spectra. The analysis of the spectra collected at multiple magnetic fields yielded the values of -2.8 ppm for the isotropic chemical shift and 1.8 MHz for the quadrupole coupling constant, which were interpreted as due to Na+ ions bonded to oxygenated groups at the edges of the graphene planes within the carbon pore network.

AB - The sodium environments in porous carbon materials prepared from NaOH activation of a char were investigated by means of multiple-field solid-state Na-23 NMR measurements, carried out at magnetic fields of 4.7, 8.45 and 14.1 T, with single-pulse excitation and magic angle spinning (MAS). The recorded spectra showed a relatively featureless resonance with linewidth and peak shift strongly dependent on the magnetic field strength and on the hydration level of the samples. The existence of second-order quadrupolar effects was inferred, although the structural disorder and the mobile character associated with the Na environment precluded the direct observation of typical quadrupolar features in the MAS NMR spectra. The analysis of the spectra collected at multiple magnetic fields yielded the values of -2.8 ppm for the isotropic chemical shift and 1.8 MHz for the quadrupole coupling constant, which were interpreted as due to Na+ ions bonded to oxygenated groups at the edges of the graphene planes within the carbon pore network.

KW - activated carbon, nuclear magnetic resonance, chemical structure, Na-23 NMR, multiple magnetic fields

U2 - 10.1016/j.ssnmr.2007.10.002

DO - 10.1016/j.ssnmr.2007.10.002

M3 - Journal article

VL - 32

SP - 109

EP - 117

JO - Solid State Nuclear Magnetic Resonance

JF - Solid State Nuclear Magnetic Resonance

SN - 1527-3326

IS - 4

ER -