Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 3, Pages 378-382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz301965d
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Funding
- Leverhulme Trust [F/07 134/DK, F/07 134/DN]
- Taiho Kogyo Tribology Research Foundation
- Weizmann UK
- Infineum UK
- EPSRC [EP/J015202/1]
- Engineering and Physical Sciences Research Council [EP/J015202/1] Funding Source: researchfish
- EPSRC [EP/J015202/1] Funding Source: UKRI
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Ionic liquids can be intricately nanostructured in the bulk and at interfaces resulting from a delicate interplay between interionic and surface forces. Here we report the structuring of a series of dialkylpyrrolidinium-based ionic liquids induced by confinement. The ionic liquids containing cations with shorter alkyl chain substituents form alternating cation-anion monolayer structures on confinement to a thin film, whereas a cation with a longer alkyl chain substituent leads to bilayer formation. The crossover from monolayer to bilayer structure occurs between chain lengths of n = 8 and 10 for these pyrrolidinium-based ionic liquids. The bilayer structure for n = 10 involves full interdigitation of the alkyl chains; this is in contrast with previous observations for imidazolium-based ionic liquids. The results are pertinent to these liquids' application as electrolytes, where the electrolyte is confined inside the pores of a nanoporous electrode, for example, in devices such as supercapacitors or batteries.
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