Supramolecular Self-Assembly of Nanoconfined Ionic Liquids for Fast Anisotropic Ion Transport

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019
Department
Department of Applied Physics
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Mcode
Degree programme
Language
en
Pages
8
Series
Advanced Functional Materials, articlenumber 1905054
Abstract
Materials involving nanoconfinement of ionic liquids (ILs) have been pursued for functionalities and ionic devices. However, their complex synthesis, challenges to achieve long-range order, and laborious tunability limit their practical implementation. Herein, these challenges are addressed by complexing surfactants to ILs, yielding a facile, modular, and scalable approach. Based on structural screening, ionic complexation of di-n-nonylamine to the terminal sulfonic acid of 1-(4-sulfobutyl)-3-methylimidazolium hydrogen sulfate IL is selected as a proof of concept. Spontaneous homeotropic smectic order over micrometers is observed, with alternating ionic and alkyl layers. The 1 nm thick ionic layers involve 2D crystalline internal order up to 150 degrees C, strongly promoting anisotropic ion transport (sigma(||)/sigma(perpendicular to) > 6500), and curiously, still allowing fluidity. High ionic conductivity of 35 mS cm(-1) and mesoscopic diffusion coefficient of approximate to 10(-5) cm(2) s(-1) at 150 degrees C along the ionic layers are observed. Fast anisotropic ion transport by simply complexing two components open doors to functional materials and applications.
Description
| openaire: EC/H2020/742829/EU//DRIVEN
Keywords
2D ionic transport, Ionic liquid, nanoconfinement, supramolecular ionic liquid crystal, surfactant-self-assembly, PHASE-TRANSITIONS, CRYSTALS, CONDUCTIVITY, SOLVENTS, RI-MP2
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Citation
Cherian, T, Nunes, D R, Dane, T G, Jacquemin, J, Vainio, U, Myllymaki, T T T, Timonen, J V, Houbenov, N, Marechal, M, Rannou, P & Ikkala, O 2019, ' Supramolecular Self-Assembly of Nanoconfined Ionic Liquids for Fast Anisotropic Ion Transport ', Advanced Functional Materials . https://doi.org/10.1002/adfm.201905054