| Autor: |
Li S; Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden., Hammond OS; Department of Materials and Environmental Chemistry, Stockholm University, Stockholm SE-114 18, Sweden.; intelligent Advanced Materials, Department of Biological & Chemical Engineering and iNANO, Aarhus University, Aarhus C 8000, Denmark., Nelson A; Australian Centre for Neutron Scattering, ANSTO, Lucas Heights, New South Wales 2234, Australia., de Campo L; Australian Centre for Neutron Scattering, ANSTO, Lucas Heights, New South Wales 2234, Australia., Moir M; National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia., Recsei C; National Deuteration Facility, ANSTO, Lucas Heights, New South Wales 2234, Australia., Shimpi MR; Department of Materials and Environmental Chemistry, Stockholm University, Stockholm SE-114 18, Sweden.; Chemistry of Interfaces, Department of Civil and Environmental Engineering, Luleå University of Technology, Luleå SE-97187, Sweden., Glavatskih S; System and Component Design, Department of Engineering Design, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden.; School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia.; Department of Electromechanical, Systems and Metal Engineering, Ghent University, Ghent B-9052, Belgium., Pilkington GA; Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden., Mudring AV; Department of Materials and Environmental Chemistry, Stockholm University, Stockholm SE-114 18, Sweden.; intelligent Advanced Materials, Department of Biological & Chemical Engineering and iNANO, Aarhus University, Aarhus C 8000, Denmark.; Department of Physics, Umeå University, Umeå SE-901 87, Sweden., Rutland MW; Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden.; School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia.; Bioeconomy and Health Department Materials and Surface Design, RISE Research Institutes of Sweden, Stockholm SE-114 28, Sweden.; Laboratoire de Tribologie et Dynamique des Systèmes, École Centrale de Lyon, Ecully Cedex 69134, France. |
| Abstrakt: |
Three nonhalogenated ionic liquids (ILs) dissolved in 2-ethylhexyl laurate (2-EHL), a biodegradable oil, are investigated in terms of their bulk and electro-interfacial nanoscale structures using small-angle neutron scattering (SANS) and neutron reflectivity (NR). The ILs share the same trihexyl(tetradecyl)phosphonium ([P 6,6,6,14 ] + ) cation paired with different anions, bis(mandelato)borate ([BMB] - ), bis(oxalato)borate ([BOB] - ), and bis(salicylato)borate ([BScB] - ). SANS shows a high aspect ratio tubular self-assembly structure characterized by an IL core of alternating cations and anions with a 2-EHL-rich shell or corona in the bulk, the geometry of which depends upon the anion structure and concentration. NR also reveals a solvent-rich interfacial corona layer. Their electro-responsive behavior, pertaining to the structuring and composition of the interfacial layers, is also influenced by the anion identity. [P 6,6,6,14 ][BOB] exhibits distinct electroresponsiveness to applied potentials, suggesting an ion exchange behavior from cation-dominated to anion-rich. Conversely, [P 6,6,6,14 ][BMB] and [P 6,6,6,14 ][BScB] demonstrate minimal electroresponses across all studied potentials, related to their different dissociative and diffusive behavior. A mixed system is dominated by the least soluble IL but exhibits an increase in disorder. This work reveals the subtlety of anion architecture in tuning bulk and electro-interfacial properties, offering valuable molecular insights for deploying nonhalogenated ILs as additives in biodegradable lubricants and supercapacitors. |
