Communication: Investigation of ion aggregation in ionic liquids and their solutions with lithium salt under high pressure
| Autor: | Patrick Judeinstein, Steve Greenbaum, Kartik Pilar, V. Balédent, Mehdi Zeghal, Stefano Passerini, Sangsik Jeong |
|---|---|
| Přispěvatelé: | Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Helmhotlz Institute of Ulm (HIU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
Analytical chemistry
General Physics and Astronomy Salt (chemistry) chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Ion law.invention chemistry.chemical_compound law [CHIM]Chemical Sciences Physical and Theoretical Chemistry Crystallization Imide ComputingMilieux_MISCELLANEOUS Alkyl [PHYS]Physics [physics] chemistry.chemical_classification 021001 nanoscience & nanotechnology 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry chemistry Ionic liquid Lithium [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 0210 nano-technology Glass transition |
| Zdroj: | Journal of Chemical Physics Journal of Chemical Physics, American Institute of Physics, 2018, 148 (3), pp.031102. ⟨10.1063/1.5016049⟩ Journal of Chemical Physics, 2018, 148 (3), pp.031102. ⟨10.1063/1.5016049⟩ |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.5016049⟩ |
| Popis: | X-ray scattering measurements were utilized to probe the effects of pressure on a series of ionic liquids, N-alkyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr1A-TFSI) (A = 3, 6, and 9), along with mixtures of ionic liquid and 30 mol. % lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. No evidence was found for crystallization of the pure ionic liquids or salt mixtures even at pressures up to 9.2 GPa. No phase separation or demixing was observed for the ionic liquid and salt mixtures. Shifts in the peak positions are indicative of compression of the ionic liquids and mixtures up to 2 GPa, after which samples reach a region of relative incompressibility, possibly indicative of a transition to a glassy state. With the application of pressure, the intensity of the prepeak was found to decrease significantly, indicating a reduction in cation alkyl chain aggregation. Additionally, incompressibility of the scattering peak associated with the distance between like-charges in the pure ionic liquids compared to that in mixtures with lithium salt suggests that the application of pressure could inhibit Li+ coordination with TFSI- to form Li[TFSI2]- complexes. This inhibition occurs through the suppression of TFSI- in the trans conformer, in favor of the smaller cis conformer, at high pressures. |
| Databáze: | OpenAIRE |
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