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  The Effect of Water and Confinement on Self-Assembly of Imidazolium Based Ionic Liquids at Mica Interfaces

Cheng, H.-W., Dienemann, J.-N., Stock, P., Merola, C., Chen, Y.-J., & Valtiner, M. (2016). The Effect of Water and Confinement on Self-Assembly of Imidazolium Based Ionic Liquids at Mica Interfaces. Scientific Reports, 6: 30058. doi:10.1038/srep30058.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C1CF-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-57EC-3
Genre: Journal Article

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 Creators:
Cheng, Hsiu-Wei1, Author              
Dienemann, Jan-Niklas1, Author              
Stock, Philipp1, Author              
Merola, Claudia1, Author              
Chen, Ying-Ju1, Author              
Valtiner, Markus1, 2, Author              
Affiliations:
1Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863357              
2Institute for physical chemistry II, Technische Universität Bergakademie Freiberg, Leipzigerstraße 29, 09599 Freiberg, Germany, ou_persistent22              

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Free keywords: THIN-FILM; ELECTROLYTES; SURFACES; FORCES; LAYERS; SIMULATION
 Abstract: Tuning chemical structure and molecular layering of ionic liquids (IL) at solid interfaces offers leverage to tailor performance of ILs in applications such as super-capacitors, catalysis or lubrication. Recent experimental interpretations suggest that ILs containing cations with long hydrophobic tails form well-ordered bilayers at interfaces. Here we demonstrate that interfacial bilayer formation is not an intrinsic quality of hydrophobic ILs. In contrast, bilayer formation is triggered by boundary conditions including confinement, surface charging and humidity present in the IL. Therefore, we performed force versus distance profiles using atomic force microscopy and the surface forces apparatus. Our results support models of disperse low-density bilayer formation in confined situations, at high surface charging and/or in the presence of water. Conversely, interfacial structuring of long-chain ILs in dry environments and at low surface charging is disordered and dominated by bulk structuring. Our results demonstrate that boundary conditions such as charging, confinement and doping by impurities have decisive influence on structure formation of ILs at interfaces. As such, these results have important implications for understanding the behavior of solid/IL interfaces as they significantly extend previous interpretations.

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Language(s): eng - English
 Dates: 2016
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000380205600001
DOI: 10.1038/srep30058
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 30058 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: /journals/resource/2045-2322