Abstract
This chapter discusses the applications of the nuclear magnetic resonance (NMR) spectroscopy to the carbon/carbon alloys. The chapter reviews the principles of NMR and the explanations of some technical terms like FID, relaxation time and spin locking. A brief account of the preparations necessary for the pitch samples, and the methods of determination of aromaticity from the 1H-NMR spectra, are also discussed. The NMR technique cannot be typically used for the carbon/graphite materials but is a powerful tool to analyze pitches, which are the parent materials of carbons. A magnetic field is not sufficiently stable to obtain a high-resolution spectrum of 1H. To overcome this, an NMR signal of a different nuclear species, that is, other than the nucleus under investigation—is monitored and the magnetic field is corrected to give the monitored signal a constant resonance frequency (NMR locking). It is essential with NMR spectroscopy to use a reference signal in order to obtain chemical shifts, because the strength of a magnetic field cannot be determined precisely enough for the requirements of the spectral analysis.
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