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Data associated with 'Microscopic and macroscopic properties of carbohydrate solutions in the ionic liquid 1-ethyl-3-methyl-imidazolium acetate'

Ries, Michael (2018) Data associated with 'Microscopic and macroscopic properties of carbohydrate solutions in the ionic liquid 1-ethyl-3-methyl-imidazolium acetate'. University of Leeds. [Dataset] https://doi.org/10.5518/369

Dataset description

Solutions of glucose, cellobiose and microcrystalline cellulose in the ionic liquid 1-ethyl-3-methyl-imidazolium acetate ([C2mim][OAc]) have been examined using low field (20 MHz) NMR relaxometry and rheology. The spin-lattice (T1) and spin-spin (T2) relaxation times have been determined from 30 °C to 70 °C inclusive for a range of concentrations (0 to 15 wt %) of each carbohydrate in [C2mim][OAc]. The zero shear rate viscosities for the same samples across the same temperature range were studied. The viscosity, NMR relaxometry and previously published diffusion data were analysed all together through Debye-Stokes-Einstein equations. Microscopically these systems behave as an “ideal mixture” of free ions and ions associated with the carbohydrate molecules. The molar ratio of carbohydrate OH groups to ionic liquid molecules, a, is the key parameter in determining the NMR relaxometry and hence the local microscopic environment of the ions. NMR relaxometry data are found to follow an Arrhenius type behavior and the difference in rotational activation energy between free and associated ions is determined at 6.2 ±0.5 kJ/mol.

Subjects: F000 - Physical sciences > F300 - Physics
Divisions: Faculty of Mathematics and Physical Sciences > School of Physics and Astronomy
Related resources:
LocationType
https://www.doi.org/10.1021/acs.jpcb.8b06939Publication
http://eprints.whiterose.ac.uk/137125/Publication
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited: 24 Aug 2018 08:51
URI: https://archive.researchdata.leeds.ac.uk/id/eprint/412

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