By I. Ando, G.A. Webb (Eds.)
This choice of experiences display the vast purview of NMR and its functions. The pellucid displays supplied comprise bills on program of NMR spectroscopy to sciences and applied sciences of glassand ceramics; high-resolution solid-state NMR experiences on ceramics; NMR reports of zeolite; NMR reviews of higher-order constructions of reliable polymers; and natural skinny movies. Taken including reports in different volumes of this sequence, the current accountsably display that NMR is facile princeps in terms of challenge fixing in such a lot components of technology, together with the scientific sciences. learn more... summary: This selection of reviews show the vast purview of NMR and its purposes. The pellucid shows supplied comprise bills on program of NMR spectroscopy to sciences and applied sciences of glassand ceramics; high-resolution solid-state NMR experiences on ceramics; NMR stories of zeolite; NMR experiences of higher-order constructions of strong polymers; and natural skinny motion pictures. Taken including reports in different volumes of this sequence, the current accountsably display that NMR is facile princeps by way of challenge fixing in such a lot parts of technological know-how, together with the clinical sciences
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Additional info for Annual Reports on NMR Spectroscopy, Vol. 28
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28 Figure 3 shows 29Si spectra of kaolinite, measured with two different fields. The splitting of the two peaks is unchanged (in ppm) by HIGH-RESOLUTION SOLID-STATE NMR STUDIES ON CERAMICS 37 Fig. 2. " (Reprinted with permission from J. Phys. ) the magnetic field, indicating that the splitting is caused by the difference in the isotropic chemical shift. The presence of two silicon environments agrees with recent results of the crystal structure obtained by diffraction studi e ~ . The ~ ~origin ' of the splitting has been discussed by Thompsong2 and Thompson and B a r r ~ n .
Bright areas indicate high water content and dark areas represent pockets of air between particles or large physical flaws such as inclusions and agglomerates of fibres. Fibre reinforced composites are very porous in the green state, due to the loose packing of the ceramic grains around the fibres. The fine distribution of small spots across the images indicated the presence of water in these open porosities. The dark spots or areas indicate flaws in the composites, caused either by foreign particles or open pores and fibre bundles formed during the casting process.