Probing the Reorganization of Ionic Liquids' Structure Induced by CO2 Sorption

Autor(es)

Lepre, Luiz Fernando ^{[1, 2]} ; Costa Gomes, Margarida ^{[1, 2]} ; Ando, Romulo Augusto ^[3]

Afiliação do(s) autor(es)

^[1] ENS Lyon, Chem Lab, 46 Allee Italie, F-69364 Lyon - France

^[2] CNRS, 46 Allee Italie, F-69364 Lyon - France

^[3] Univ Sao Paulo, Dept Fundamental Chem, Mol Spect Lab, Inst Chem, Ave Prof Lineu Prestes 748, BR-05508000 Butanta, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ChemPhysChem; v. 21, n. 12 MAY 2020.
• Citações Web of Science: 0

Resumo

The sorption of CO2 is often used to modify the macroscopic properties of liquids and solids. In the particular case of ionic liquids, different from molecular liquids, the sorption of CO2 may not induce volume expansions due to the strong Coulombic interactions between the ions of the fluid. However, a considerable viscosity decrease has been systematically observed. In order to understand the mechanisms of properties modifications in ionic fluids, herein we used Raman spectroscopy to probe the effect of CO2 on the structure of ionic liquids. It is shown that CO2 perturbs the electrostatic interactions between cations and anions, thus inducing a change in the polar domain of ionic liquids. It is observed that ionic liquids having bulkier ions are more prone to be perturbed by CO2 in comparison to ionic liquids having smaller ions. These results reveal new means of controlling the electrostatic forces between the ions and contributes to the mechanistic understanding of the modification of the macroscopic properties of ionic liquids by CO2 sorption. (AU)

• Processo FAPESP: 16/21070-5 - Espectroscopia vibracional com resolução espacial
• Beneficiário: Mauro Carlos Costa Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/23234-7 - Líquidos Iônicos para Captura de CO2: Absorção Física vs. Química.
• Beneficiário: Luiz Fernando Lepre
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/07145-0 - Líquidos iônicos para captura de dióxido de carbono
• Beneficiário: Luiz Fernando Lepre
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado