AI Article Synopsis
- The study investigates cellulose nanocrystal films with different structural arrangements using sodium (Na) solid-state NMR spectroscopy.
- It finds that Na cations are well hydrated and move in confined spaces, with more dynamic behavior in films with disordered structures compared to ordered ones.
- The research provides detailed insights into the environments of Na within these films and suggests that NMR spectroscopy can effectively characterize the order in nanocellulose samples.
Article Abstract
Cellulose nanocrystal films with either disordered or chiral nematic structures of varying helical pitch were investigated using Na solid-state nuclear magnetic resonance (NMR) spectroscopy. Spin lattice relaxation of H correlated with Na analyzed by indirect observation using polarization transfer from H nuclei to Na nuclei showed that the Na cations are well hydrated in the cellulose nanocrystal films. Linewidth analysis in solid-state Na NMR showed that the Na cations move in confined spaces, and that the Na cations in the film having disordered structure are more dynamic than in the films having ordered structure. From lineshape analysis of the Na 2D nutation NMR spectra, we can distinguish the Na environments within the ordered and disordered films, and find trends in anisotropic interaction parameters between ordered samples with different pitches. These are the first detailed Na NMR spectroscopic studies of CNC-Na films, and they show that this technique may be a powerful probe for characterizing the extent of order in nanocellulose samples.
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| http://dx.doi.org/10.1016/j.ssnmr.2018.12.001 | DOI Listing |
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