Bibliographic Details
| Title: |
Electro-responsivity of ionic liquid boundary layers in a polar solvent revealed by neutron reflectance. |
| Authors: |
Pilkington, Georgia A., Harris, Kathryn, Bergendal, Erik, Reddy, Akepati Bhaskar, Palsson, Gunnar K., Vorobiev, Alexei, Antzutkin, Oleg. N., Glavatskih, Sergei, Rutland, Mark W. |
| Source: |
Journal of Chemical Physics; 5/21/2018, Vol. 148 Issue 19, pN.PAG-N.PAG, 9p, 2 Diagrams, 1 Chart, 5 Graphs |
| Subject Terms: |
IONIC liquids, BOUNDARY layer (Aerodynamics), NEUTRON reflectivity, POLAR solvent analysis, MEASUREMENT of viscosity, ION scattering |
| Abstract: |
Using neutron reflectivity, the electro-responsive structuring of the non-halogenated ionic liquid (IL) trihexyl(tetradecyl)phosphonium-bis(mandelato)borate, [P6,6,6,14][BMB], has been studied at a gold electrode surface in a polar solvent. For a 20% w/w IL mixture, contrast matched to the gold surface, distinct Kiessig fringes were observed for all potentials studied, indicative of a boundary layer of different composition to that of the bulk IL-solvent mixture. With applied potential, the amplitudes of the fringes from the gold-boundary layer interface varied systematically. These changes are attributable to the differing ratios of cations and anions in the boundary layer, leading to a greater or diminished contrast with the gold electrode, depending on the individual ion scattering length densities. Such electro-responsive changes were also evident in the reflectivities measured for the pure IL and a less concentrated (5% w/w) IL-solvent mixture at the same applied potentials, but gave rise to less pronounced changes. These measurements, therefore, demonstrate the enhanced sensitivity achieved by contrast matching the bulk solution and that the structure of the IL boundary layers formed in mixtures is strongly influenced by the bulk concentration. Together these results represent an important step in characterising IL boundary layers in IL-solvent mixtures and provide clear evidence of electro-responsive structuring of IL ions in their solutions with applied potential. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Chemical Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Complementary Index |
