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Probing Spatial Distribution of Alignment by Deuterium NMR Imaging
Author(s) -
TrigoMouriño Pablo,
Merle Christian,
Koos Martin R. M.,
Luy Burkhard,
Gil Roberto R.
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201300254
Subject(s) - deuterium , deuterium nmr , nuclear magnetic resonance , nmr spectra database , nuclear magnetic resonance spectroscopy , materials science , spectral line , chemistry , physics , nuclear physics , astronomy
Deuterium NMR imaging was used to evaluate the spatial distribution of the degree of alignment in different types of alignment media by monitoring the deuterium quadrupolar splitting using spatially resolved NMR techniques in conventional liquid state NMR instruments. These images allow the unambiguous distinction of magnetic field and alignment inhomogeneities present in partially aligned samples, revealing the underlying reasons for linebroadening within an alignment medium that cannot be explained by the sole analysis of 1D 2 H NMR spectra. For example, alignment inhomogeneities due to broken gels or the presence of concentration gradients in liquid crystalline solutions are clearly detected by the imaging methods proposed in this work.