Search

Your search keyword '"Munoz, Stephen"' showing total 17 results
Start Over Author "Munoz, Stephen"
17 results on '"Munoz, Stephen"'

6. Fluoride-ion solvation in non-aqueous electrolyte solutions

Author

Robert H. Grubbs, Victoria K. Davis, Jeongmin Kim, Keith J. Billings, Thomas F. Miller, Simon C. Jones, Munoz Stephen, Nebojša Momčilović, and Christopher M. Bates

Subjects
Inorganic chemistry, Solvation, 02 engineering and technology, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, Solvent, chemistry.chemical_compound, chemistry, Materials Chemistry, Ionic conductivity, General Materials Science, Propionitrile, 0210 nano-technology, Fluoride, Dissolution
Abstract

Understanding the factors that influence ion-solvent properties for the fluoride ion in organic solvents is key to the development of useful liquid electrolytes for fluoride-ion batteries. Using both experimental and computational methods, we examined a range of chemical and electrochemical properties for a set of organic solvents in combination with dry N,N,N-trimethylneopentylammonium fluoride (Np₁F) salt. Results showed that solvent electronic structure strongly influences Np₁F dissolution, and the pK_a of solvent protons provides a good guide to potential F⁻ reactivity. We found a number of organic solvents capable of dissolving Np₁F while providing chemically-stable F⁻ in solution and characterized three of them in detail: propionitrile (PN), 2,6-difluoropyridine (2,6-DFP), and bis(2,2,2-trifluoroethyl) ether (BTFE). Arrhenius analysis for Np₁F/PN, Np₁F/DFP, and Np₁F/BTFE electrolytes suggests that DFP facilitates the highest F⁻ ion mobility of the three neat solvents. Electrolyte mixtures of BTFE and amide co-solvents exhibit higher ionic conductivity than the neat solvents. This improved ionic conductivity is attributed to the ability of BTFE:co-solvent mixtures to partition between Np₁⁺ and F⁻ ion-aggregates, promoting better ion dissociation.

Published
2019

7. Fluoride-ion solvation in non-aqueous electrolyte solutions

Author

Davis, Victoria K., primary, Munoz, Stephen, additional, Kim, Jeongmin, additional, Bates, Christopher M., additional, Momčilović, Nebojša, additional, Billings, Keith J., additional, Miller, Thomas F., additional, Grubbs, Robert H., additional, and Jones, Simon C., additional

Published
2019
Full Text
View/download PDF

11. Liquid Structure with Nano-Heterogeneity Promotes Cationic Transport in Concentrated Electrolytes

Author

Borodin, Oleg, primary, Suo, Liumin, additional, Gobet, Mallory, additional, Ren, Xiaoming, additional, Wang, Fei, additional, Faraone, Antonio, additional, Peng, Jing, additional, Olguin, Marco, additional, Schroeder, Marshall, additional, Ding, Michael S., additional, Gobrogge, Eric, additional, von Wald Cresce, Arthur, additional, Munoz, Stephen, additional, Dura, Joseph A., additional, Greenbaum, Steve, additional, Wang, Chunsheng, additional, and Xu, Kang, additional

Published
2017
Full Text
View/download PDF

16. Towards Better Understanding of Molecular Solvent Behavior in Ionic Liquid-Biopolymer Mixtures

Author

Fox, Eric T, Fahey, Patrick J, Gobet, Mallory, Munoz, Stephen, Head, Audrey C., Greenbaum, Steven, De, Hugh C, and, Long, and Trulove, Paul C

Abstract

The physical and transport properties (density, viscosity, ionic conductivity, and ion diffusion coefficients) are reported for solutions containing 1-ethyl-3-methylimidazolium acetate (EMIAc) and cellulose, either with no molecular solvent, with water, or with acetonitrile (AN). Ionicity values, or the fraction of ions present in the ionic liquid (IL) that are "free" were calculated for each solution. The addition of molecular solvents to IL-cellulose solutions significantly changes the association behavior of the ions, with the presence of acetonitrile increasing aggregation while water decreases aggregation. Adding cellulose to all solutions results in more ideal behavior from the IL, with the increase in ideality being a function of the type of solvent present. The observed behavior suggests that water and AN have fundamentally different interactions with EMIAc and these differences in interaction may explain the varying cellulose solvation behavior of solutions containing these solvents.

Published
2016

Catalog

Books, media, physical & digital resources
See catalog results