Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 66,
  • Issue 2,
  • pp. 208-217
  • (2012)

Concentration Measurements in Ionic Liquid-Water Mixtures by Mid-Infrared Spectroscopy and Indirect Hard Modeling

Not Accessible

Your library or personal account may give you access

Abstract

An analytical method for the quantitative characterization of binary mixtures of water and ionic liquids (ILs) is presented. Mid-infrared (mid-IR) spectroscopy in combination with indirect hard modeling (IHM) is employed to quantify the water content in 1-butyl-3-methylimidazolium chloride (BMIMCl), 1,3-dimethylimidazolium dimethylphosphate (DMIMDMP), and 1-ethyl-3-methylimidazolium acetate (EMIMAc). Despite significant nonlinear shifts of the spectral bands, a good spectral fit with calibration errors of less than 2.3 wt % can be achieved almost over the whole concentration range. A profound analysis of the spectral models including peak assignment substantiates the physico-chemical foundation of the spectral models. Furthermore, the shift of peak functions in the spectral models is shown to provide a measure of molecular interaction in IL-water mixtures, which can also be utilized quantitatively. The vibrational bands of the water dipole reveal differences in the strength of hydrogen bonding with water in the IL studied. These properties of the spectral hard models demonstrate their quantitative analytical potential and set the stage for multiway calibration in comprehensive reaction monitoring in these highly interacting mixtures of IL and water.

PDF Article
More Like This
Rapid, accurate, and precise concentration measurements of a methanol–water mixture using Raman spectroscopy

Daniel D. Hickstein, Russell Goldfarbmuren, Jack Darrah, Luke Erickson, and Laura A. Johnson
OSA Continuum 1(3) 1097-1110 (2018)

Model for Infrared Emission of Water Vapor/Aerosol Mixtures

H. R. Carlon
Appl. Opt. 10(10) 2297-2303 (1971)

Ultrabroad near-infrared photoluminescence from ionic liquids containing subvalent bismuth

Hong-Tao Sun, Yoshio Sakka, Minoru Fujii, Naoto Shirahata, and Hong Gao
Opt. Lett. 36(2) 100-102 (2011)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved