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• W3019351697 startingPage "1118" @default.
• W3019351697 abstract "Abstract Magic‐angle‐spinning (MAS) enhances sensitivity and resolution in solid‐state nuclear magnetic resonance (NMR) measurements. MAS is obtained by aerodynamic levitation and drive of a rotor, which results in large centrifugal forces that may affect the physical state of soft materials, such as polymers, and subsequent solid‐state NMR measurements. Here, we investigate the effects of MAS on the solid‐state NMR measurements of a polymer electrolyte for lithium‐ion battery applications, poly(ethylene oxide) (PEO) doped with the lithium salt LiTFSI. We show that MAS induces local chain ordering, which manifests itself as characteristic lineshapes with doublet‐like splittings in subsequent solid‐state 1 H, 7 Li, and 19 F static NMR spectra characterizing the PEO chains and solvated ions. MAS results in distributions of stresses and hence local chain orientations within the rotor, yielding distributions in the local magnetic susceptibility tensor that give rise to the observed NMR anisotropy and lineshapes. The effects of MAS were investigated on solid‐state 7 Li and 19 F pulsed‐field‐gradient (PFG) diffusion and 7 Li longitudinal relaxation NMR measurements. Activation energies for ion diffusion were affected modestly by MAS. 7 Li longitudinal relaxation rates, which are sensitive to lithium‐ion dynamics in the nanosecond regime, were essentially unchanged by MAS. We recommend that NMR researchers studying soft polymeric materials use only the spin rates necessary to achieve the desired enhancements in sensitivity and resolution, as well as acquire static NMR spectra after MAS experiments to reveal any signs of stress‐induced local ordering." @default.
• W3019351697 created "2020-05-01" @default.
• W3019351697 creator A5032530805 @default.
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• W3019351697 date "2020-07-22" @default.
• W3019351697 modified "2023-10-09" @default.
• W3019351697 title "Magic-angle-spinning-induced local ordering in polymer electrolytes and its effects on solid-state diffusion and relaxation NMR measurements" @default.
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• W3019351697 doi "https://doi.org/10.1002/mrc.5033" @default.
• W3019351697 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32324938" @default.
• W3019351697 hasPublicationYear "2020" @default.
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