Working visit at UCCS-UG SF Lille
Between 21st and 24th of November 2018 Natalia Olejnik-Fehér spent time working at UCCS-UG SF Lille, where she was granted access to 800 MHz solid-state spectrometer in frames of IR-RMN infrastructure that is a proposal-based system to grant access to use high-field instruments in France. Once accepted, it covers the costs of travel and stay in the destination city. Earlier during her stay at Grenoble Natalia wrote a proposal for measurement time in Lille, using her samples. This visit was a result of its acceptance.
To get a fuller view of the ZnO NC surface, 17O and 67Zn NMR can be employed since even small variations in the electric field gradient around these quadrupolar nuclei (i.e. local structural environments) can give intricate insights. Although the selective experiments yield 17O signals from the near-surface, these are not very informative as they are broad, with possibly many overlapping resonances of interest. Indeed, higher fields for quadrupolar nuclei, such as 17O and 67Zn, can be crucial to obtain informative data since not only does this separate resonances, but the broadening induced by the residual second order quadrupolar interaction is inversely proportional to external magnet-ic field. Therefore, increasing the magnetic field coupled with faster MAS can lead to substantially increased resolution and sensitivity, permitting data to be obtained that was not previously possible.
21-24 November, 2018