Journal article
Ionic Liquid Mixture at the Vacuum Interface and the Peaks and Antipeaks Analysis of X-ray Reflectivity
Journal of physical chemistry. C, Vol.123(8), pp.4914-4925
02/28/2019
DOI: 10.1021/acs.jpcc.8b11958
Abstract
This article presents work on the structure of the ionic liquid mixture between 1-methyl-3-octylimidazolium octylsulfate and 1-ethyl-3-methylimidazolium ethylsulfate at the vacuum interface. In particular, we focus on the relative concentration of components as a function of distance to the interface and the formation of a nanoscopic apolar blocking layer that encloses a second thicker and much more polar interfacial layer. We present a thorough analysis of the time scale for the convergence of structural features as they dissipate into the bulk and provide a clear estimation of the interface persistence lengthscale. We also show how the peaks and antipeaks analysis that our group has developed to better understand polar–apolar and positive–negative alternations in the bulk structure factor S(q) can be recast to provide novel and insightful information about interfacial reflectivity. The analysis dissects the nearly featureless overall normalized reflectivity into a rich collection of peaks and antipeaks that provides significant insight into the location and width of apolar and charged layers. The peaks and antipeaks analysis captures fine structural details within layers—including the pattern of charge alternation that is non-lateral—associated with the preferential arrangement of charged species within a polar layer.
Details
- Title: Subtitle
- Ionic Liquid Mixture at the Vacuum Interface and the Peaks and Antipeaks Analysis of X-ray Reflectivity
- Creators
- Fei WuWaruni V KarunaratneClaudio J Margulis
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry. C, Vol.123(8), pp.4914-4925
- DOI
- 10.1021/acs.jpcc.8b11958
- NLM abbreviation
- J Phys Chem C Nanomater Interfaces
- ISSN
- 1932-7447
- eISSN
- 1932-7455
- Publisher
- American Chemical Society
- Grant note
- DOI: 10.13039/100000165, name: Division of Chemistry, award: CHE-1664832
- Language
- English
- Date published
- 02/28/2019
- Academic Unit
- Chemistry
- Record Identifier
- 9983985879902771
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