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What causes extended layering of ionic liquids on the mica surface?
Extended layering of ionic liquids (ILs) on the mica surface has been reported by several groups previously and it is generally accepted that the electrostatic interaction at the IL/mica interface is critical to the observed extended layering. Here we report that, indeed, water adsorption on the mic...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Royal Society of Chemistry
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5492871/ https://www.ncbi.nlm.nih.gov/pubmed/28706709 http://dx.doi.org/10.1039/c5sc00832h |
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author | Gong, Xiao Kozbial, Andrew Li, Lei |
author_facet | Gong, Xiao Kozbial, Andrew Li, Lei |
author_sort | Gong, Xiao |
collection | PubMed |
description | Extended layering of ionic liquids (ILs) on the mica surface has been reported by several groups previously and it is generally accepted that the electrostatic interaction at the IL/mica interface is critical to the observed extended layering. Here we report that, indeed, water adsorption on the mica surface is the key to the extended layering of ionic liquids. The atomic force microscopy (AFM), attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) and contact angle (CA) results show that ionic liquids form extended layering on a mica surface under ambient conditions when water is adsorbed on the mica surface under such conditions. However, when airborne hydrocarbon contaminants replace the water on the mica surface at the elevated temperatures, instead of layering, ionic liquids exhibit droplet structure, i.e., dewetting. Based on the experimental results, we propose that water enables ion exchange between K+ and the cations of ILs on the mica surface and thus triggers the ordered packing of cations/anions in ILs, resulting in extended layering. |
format | Online Article Text |
id | pubmed-5492871 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-54928712017-07-13 What causes extended layering of ionic liquids on the mica surface? Gong, Xiao Kozbial, Andrew Li, Lei Chem Sci Chemistry Extended layering of ionic liquids (ILs) on the mica surface has been reported by several groups previously and it is generally accepted that the electrostatic interaction at the IL/mica interface is critical to the observed extended layering. Here we report that, indeed, water adsorption on the mica surface is the key to the extended layering of ionic liquids. The atomic force microscopy (AFM), attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) and contact angle (CA) results show that ionic liquids form extended layering on a mica surface under ambient conditions when water is adsorbed on the mica surface under such conditions. However, when airborne hydrocarbon contaminants replace the water on the mica surface at the elevated temperatures, instead of layering, ionic liquids exhibit droplet structure, i.e., dewetting. Based on the experimental results, we propose that water enables ion exchange between K+ and the cations of ILs on the mica surface and thus triggers the ordered packing of cations/anions in ILs, resulting in extended layering. Royal Society of Chemistry 2015-06-01 2015-04-20 /pmc/articles/PMC5492871/ /pubmed/28706709 http://dx.doi.org/10.1039/c5sc00832h Text en This journal is © The Royal Society of Chemistry 2015 http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Chemistry Gong, Xiao Kozbial, Andrew Li, Lei What causes extended layering of ionic liquids on the mica surface? |
title | What causes extended layering of ionic liquids on the mica surface?
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title_full | What causes extended layering of ionic liquids on the mica surface?
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title_fullStr | What causes extended layering of ionic liquids on the mica surface?
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title_full_unstemmed | What causes extended layering of ionic liquids on the mica surface?
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title_short | What causes extended layering of ionic liquids on the mica surface?
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title_sort | what causes extended layering of ionic liquids on the mica surface? |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5492871/ https://www.ncbi.nlm.nih.gov/pubmed/28706709 http://dx.doi.org/10.1039/c5sc00832h |
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