In:
ChemPhysChem, Wiley, Vol. 14, No. 16 ( 2013-11-11), p. 3726-3730
Abstract:
We present the first systematic study of the influence of temperature on the degree of surface enrichment of 1‐alkyl‐3‐methylimidazolium‐based ionic liquids (ILs). Using angle‐resolved X‐ray photoelectron spectroscopy, we demonstrate that the degree of surface enrichment strongly decreases with increasing temperature for all the studied ILs. For ILs with the same cation, but different anions, [C 8 C 1 Im]Br, [C 8 C 1 Im][TfO] and [C 8 C 1 Im][Tf 2 N], no significant differences of the temperature‐induced partial loss of surface enrichment are found. Measurements for [C 4 C 1 Im][TfO] , [C 8 C 1 Im][TfO] and [C 18 C 1 Im][TfO] indicate a small effect of the chain length. For [C 18 C 1 Im][TfO] , a continuous decrease of alkyl surface enrichment is found with increasing temperature, with no abrupt changes at the phase‐transition temperature from the smectic A to the isotropic phase, indicating that the surface enrichment is not affected by this phase transition.
Type of Medium:
Online Resource
ISSN:
1439-4235
,
1439-7641
DOI:
10.1002/cphc.201300719
Language:
English
Publisher:
Wiley
Publication Date:
2013
detail.hit.zdb_id:
2025223-7
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