High-Field Static QCPMG 47Ti and 49Ti Studies of Nanoparticulate TiO2
EMSL Project ID
21495
Abstract
Titanium dioxide (TiO2) nanomaterials offer unique challenges for characterization, especially of their surfaces, which may be structurally distinct from their crystalline cores. While x-ray diffraction is particularly effective at characterizing crystalline forms of TiO2, the lack of crystallinity at the surface is something not easily probed via various spectroscopies. NMR is ideally suited for the analysis of such surface species. However, the elements present in this material provide some unique challenges for observation. 17O is exceedingly rare as an NMR-sensitive isotope, and the two isotopes of titanium, 47Ti and 49Ti, have very large quadrupolar moments and have been avoided in the past. Recent work at PNNL on 47/49Ti has demonstrated that such spectra can be recorded for anatase and rutile TiO2, using QCPMG sequences. We propose to examine several samples of nanocrystalline TiO2 in order to observe Ti-lineshapes as a function of particle size, morphology, and potentially vanadium- or lead- modified analogues.
Project Details
Project type
Capability Research
Start Date
2007-03-01
End Date
2008-04-21
Status
Closed
Released Data Link
Team
Principal Investigator