A. Parmar et al. / Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 97 (2012) 137–143
143
Scheme 3. Possible location of ILs in P103 micelle.
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The CP, DLS, SANS and NMR studies show that addition of the
ILs Cnmim BF4 to aqueous P103 micellar solution affects the solu-
tion behavior. The measurements revealed that ILs can increase
CP of P103 dramatically. This could be due to (i) hydrogen-bond
interactions between the imidazolium cation of the ionic liquid
and PEO units of P103 and (ii) hydrophobic interactions between
the alkyl chain of the imidazolium cation and the hydrophobic
chain of P103. The DLS results showed the size alteration; with
C4mim BF4, the micelle size increases as the electrostatic repulsion
between PEO groups of P103 is increased due to the permeation of
imidazolium cation and forms bigger aggregates. With C6mim BF4
the micelle size of P103 remains unchanged where the shell region
remains unaffected by the addition of C6mim BF4 as it aligns close
to core region and hence no observable change in the size. For
C8mim BF4, the micelle size of P103 increases due to the fact that
C8mim BF4 may align itself along with the P103 micelle and may
cause expulsion of water from the mixed micelle causing contrac-
tion of size. SANS data are in good agreement to the results ob-
served from the DLS. The selective NOESY spectrum indicates
that the PPO block of P103 interacts with the butyl group of the
imidazolium cation by hydrophobic interaction.
The data strongly indicate partitioning of Cnmim BF4 into micel-
lar phase and formation of mixed micelles. The presence of IL with-
in the micelles results in enhanced dipolarity with significantly
altering CP, micelle size and aggregation number. This may turn
out to be fairly useful in many applications involving micellar
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