Issue 22, 2014

Interactions of ionic liquids with hydration layer of poly(N-isopropylacrylamide): comprehensive analysis of biophysical techniques results

Abstract

Here, we report comprehensive analysis of biophysical technique results for the influence of ionic liquids (ILs) containing the same cation, 1-butyl-3-methylimidazolium (Bmim+), and commonly used anions such as SCN, BF4, I, Br, Cl, CH3COO and HSO4 on the phase transition temperature of poly(N-isopropylacrylamide) (PNIPAM) aqueous solution. Further, the effect of these ILs on bovine serum albumin (BSA) has also been studied. The modulations in UV-visible (UV-vis) absorption spectra, fluorescence intensity spectra, viscosity (η), hydrodynamic diameter (dH), Fourier transform infrared (FTIR) spectra and scanning electron microscopy (SEM) micrographs clearly reflect the change in the hydration state of PNIPAM in the presence of ILs. The observed single phase transition of PNIPAM aqueous solution at higher concentration of IL is the result of weak ion–ion pair interactions in IL.

Graphical abstract: Interactions of ionic liquids with hydration layer of poly(N-isopropylacrylamide): comprehensive analysis of biophysical techniques results

Supplementary files

Article information

Article type
Paper
Submitted
02 Jan 2014
Accepted
05 Mar 2014
First published
05 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 10708-10718

Author version available

Interactions of ionic liquids with hydration layer of poly(N-isopropylacrylamide): comprehensive analysis of biophysical techniques results

P. M. Reddy, R. Umapathi and P. Venkatesu, Phys. Chem. Chem. Phys., 2014, 16, 10708 DOI: 10.1039/C4CP00010B

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