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X-Ray reflectometry studies on the effect of water on the surface structure of [C(4)mpyr][NTf2] ionic liquid
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SYSNO ASEP 0341127 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title X-Ray reflectometry studies on the effect of water on the surface structure of [C(4)mpyr][NTf2] ionic liquid Author(s) Minofar, Babak (UEK-B) RID Number of authors 6 Source Title Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076
Roč. 11, č. 48 (2009), s. 11507-11514Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords SUM-FREQUENCY GENERATION ; MOLECULAR-DYNAMICS ; AQUEOUS-SOLUTIONS Subject RIV CE - Biochemistry R&D Projects LC06010 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z60870520 - UEK-B (2005-2011) UT WOS 000272271400018 Annotation The effect of water on surface structure of 1-butyl-1-methylpyrrolidinium trifluoromethylsulfonylimide was investigated using X-ray reflectometry. The measured data suggests a significant amount of water is adsorbed at the surface, with the first layer from the gas-liquid phase mainly occupied by a mixture of cations and water. Beyond the cation+water layer, the scattering length density increases towards the bulk value, indicats a decreas amount of water and cations, and/or an increasing amount of anions. The orientation of the butyl chain of cation at the phase boundary and the population of water at the surface were described based on results from molecular dynamics simulation. We show that the presence of water in the ionic liquid has a non-monotonic effect on the thickness of the surface. At low water content, the addition of water does not change the surface thickness since water is mainly present in the bulk. As the water content increases the surface swells shrinks down. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2010
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