Influence of <i>N</i>‑Alkylpyridinium
Halide Based Ionic Liquids on Micellization of P123 in Aqueous Solutions:
A SANS, DLS, and NMR Study
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Abstract
The isotropic micellar state of Pluronic
P123 in the presence and
absence of <i>N</i>-alkylpyridinium halide ionic liquids
(ILs) is investigated using SANS, DLS, and <sup>1</sup>H NMR studies.
The micellar structural parameters are obtained as a function of variation
in alkyl chain length, anions, and concentrations of ILs by fitting
the SANS scattering data with a model composed of core–shell
form factor and a hard sphere structure factor of interaction. Addition
of ILs decreases the micellar core, aggregation number, and hard sphere
radius of P123 micelles. From quantitative analysis, we determined
the amount of solvent (D<sub>2</sub>O + IL) present inside the core
and the core–shell interface along with cationic head groups.
This is further supported by monitoring interaction between ILs and
polymer micelle using <sup>1</sup>H NMR spectroscopy. The results
are discussed and explained as a function of concentration of C<sub>8</sub>PyCl, alkyl chain length, and anions of <i>N</i>-alkylpyridinium halides