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Ivanova A.S.,Carnegie Mellon University | Brinzer T.,University of Pittsburgh | Roth E.A.,U.S. National Energy Technology Laboratory | Kusuma V.A.,U.S. National Energy Technology Laboratory | And 9 more authors.
RSC Advances | Year: 2015

A simple binary system of compounds resembling short-chain versions of popular ionic liquids has been shown to have surprisingly complex properties. Combining methylated versions of pyridinium and pyrrolidinium bis[(trifluoromethyl)sulfonyl]imide gave desirable properties such as low viscosity and high conductivity solubility per unit volume. The binary combinations studied in this study showed that these materials were stable liquids at 50 °C and had a threefold improvement in conductivity over [C6C1im][Tf2N]. Despite the high densities of these materials, 2D-IR studies indicate increased ion mobility, likely due to the lack of hindering alkyl chains. © The Royal Society of Chemistry 2015.

Lartey M.,U.S. National Energy Technology Laboratory | Meyer-Ilse J.,Lawrence Berkeley National Laboratory | Watkins J.D.,U.S. National Energy Technology Laboratory | Roth E.A.,U.S. National Energy Technology Laboratory | And 13 more authors.
Physical Chemistry Chemical Physics | Year: 2015

A series of four isomeric 1,2,3-triazolium-based ionic liquids (ILs) with vary degree of branching were synthesized and characterized to investigate the effect of ion branching on thermal and physical properties of the resulting IL. It was found that increased branching led to a higher ionicity and higher viscosity. The thermal properties were also altered significantly and spectral changes in the near edge X-ray absorption fine structure (NEXAFS) spectra show that branching affects intermolecular interaction. While the ionicity and viscosity varying linearly with branching, the MDSC and NEXAFS measurements show that the cation shape has a stronger influence on the melting temperature and absorptive properties than the number of branched alkyl substituents. © 2015 the Owner Societies.

Watkins J.D.,U.S. National Energy Technology Laboratory | Siefert N.S.,U.S. National Energy Technology Laboratory | Zhou X.,Liquid Ion Solutions LLC | Myers C.R.,U.S. National Energy Technology Laboratory | And 4 more authors.
Energy and Fuels | Year: 2015

The proton-coupled electron transfer (PCET) reaction of a quinone has been used to create a pH gradient capable of the active pumping of CO2 through a liquid membrane. The quinone redox couples, hydroquinone/benzoquinone and 2,6-dimethylbenzoquinone/2,6-dimethylhydroquinone, have been investigated in the proton transfer mechanisms associated with electron transfer in sodium bicarbonate solutions. These same conditions have then been applied to an active liquid membrane for proton pumping across a membrane electrode assembly under potential bias, acting as an active membrane for CO2 separation. Qualitative results are reported toward the development of an active redox membrane for CO2 separation from flue gas. © 2015 American Chemical Society.

Zhou X.,U.S. National Energy Technology Laboratory | Zhou X.,Liquid Ion Solutions LLC | Obadia M.M.,University of Lyon | Venna S.R.,U.S. National Energy Technology Laboratory | And 11 more authors.
European Polymer Journal | Year: 2016

A series of cross-linked polyether-based 1,2,3-triazolium ion conducting membranes are prepared via the combination of thermally promoted Huisgen 1,3-dipolar cycloaddition of a dialkyne and a diazide poly(trimethylene ether glycol) monomers with in-situ N-alkylation of the resulting poly(1,2,3-triazole)s with varying contents of 1,10-diiododecane as cross-linking agent. The resulting free-standing membranes have Tgs below −60 °C, Tds up to 230 °C, and Young's modulus up to 4.2 MPa. The overall combined reaction kinetics were studied by DSC yielding an activation energy of 76 kJ/mol by the Kissinger method. These ion conducting membranes have conductivities up to 10−6 S/cm at 30 °C under anhydrous conditions. They have potential to be used in CO2 separation applications as they exhibit CO2 permeability of 59–110 Barrer and CO2/N2 selectivity of 25–48. © 2016 Elsevier Ltd

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