References in periodicals archive ?
[sup.51]V MAS NMR spectra of both initial and hydrogenated films (Figure 11(a)) contain the only signal with isotropic shift around -575 ppm, which corresponds to vanadium in the vanadium pentoxide phase of [V.sub.2][O.sub.5]-xerogel [24].
The deconvoluted [sup.29]Si MAS NMR spectra of the samples obtained from the fitting are plotted in Figure 7; reaction ratio, MCL, and Al/Si ratio were calculated, and the results are shown in Table 3.
Aluminum formate and alumina powders were characterized by FT-IR, [sup.13]C and [sup.27]Al MAS NMR spectroscopy, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, scanning transmission electron microscopy (STEM), and high-resolution transmission electron microscopy (HRTEM).
Additionally, [sup.27]Al MAS NMR and [sup.29]Si MAS NMR were also measured and are recorded in Table 1.
By comparing [sup.1]H MAS NMR spectra of OMP and salts, the absence of a signal at 13.5 ppm in the latter has been attributed to the deprotonation of nitrogen in salts.
Estimation of the specic surface area of apatites in human mineralized tissues using 31 p mas NMR. solid state nuclear magnetic resonance 2007; 32: 53-58.
The main signal of aluminum tetra-coordinated with oxygen in [sup.27] Al MAS NMR spectrum was of 58 ppm.
[sup.29]Si MAS NMR spectra were recorded at 99.36 MHz with a Bruker Avance 500 spectrometer and 7 mm (external diameter) zirconia rotors, with CP ([sup.1]H-[sup.29]Si CP-MAS NMR) and without ([sup.29]Si MAS NMR).
Wawer, "[sup.13]C CP MAS NMR, FTIR, Xray diffraction and PM3 studies of some N-(w-carboxyalkyl) morpholine hydrohalides," Journal of Molecular Structure, vol.
[52] using the infrared asymmetrical TOT valence vibration (T = Si, Al) and [sup.29]Si MAS NMR data obtained by Engelhardt and Michel [54].
[sup.29]Si MAS NMR data clearly showed a shift to higher Q values (Q2 and Q3 to Q4) in all three structures, implying the progressive loss of Si-OH groups through condensation with increasing treatment temperature.