jp309661p_si_001.pdf (472.11 kB)
Interaction of Levitated Ionic Liquid Droplets with Water
journal contribution
posted on 2012-12-06, 00:00 authored by Jonas Schenk, Ulrich Panne, Merwe AlbrechtThe influence of a humid or dry atmosphere on acoustically
levitated
ionic liquid droplets was studied by volumetric analysis and vibrational
spectroscopy. Imidazolium-based ionic liquids with two types of anions,
fluorinated (BF4 and PF6) and alkylsulfate anions,
were investigated. The amount of absorbed water was correlated with
structural differences of the ionic liquids and analyzed in terms
of equilibrium mole fraction as well as absorption rate. The type
of anion had the most significant influence on the amount of adsorbed
water from the atmosphere. Furthermore, spectral changes in the in
situ Raman spectra due to absorbed water were studied for all investigated
ionic liquids. For 1-ethyl-3-methylimidazolium ethylsulfate, an exemplary
detailed analysis of the intermolecular interactions between cations,
anions and water was carried out based on the spectroscopic data.
The observed band shifts were explained with a hydrogen bond between
the anion and water.