Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy

Coil to globule transition in poly(N-isopropylacrylamide) aqueous solutions was studied using spin probe continuous-wave electronic paramagnetic resonance (CW EPR) spectroscopy with an amphiphilic TEMPO radical as a guest molecule. Using Cu(II) ions as the “quencher” for fast-moving radicals in the...

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Autores principales:	Ekaterina M. Zubanova, Sergei V. Kostjuk, Peter S. Timashev, Yury A. Rochev, Alexander I. Kokorin, Mikhail Ya. Melnikov, Elena N. Golubeva
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermoresponsive polymers electronic paramagnetic resonance spin probe nitroxides coil to globule Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/d0ced68ddb8e4f53ae8404d9acdb7641
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id	oai:doaj.org-article:d0ced68ddb8e4f53ae8404d9acdb7641
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spelling	oai:doaj.org-article:d0ced68ddb8e4f53ae8404d9acdb76412021-11-11T18:48:30ZInhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy10.3390/polym132138292073-4360https://doaj.org/article/d0ced68ddb8e4f53ae8404d9acdb76412021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3829https://doaj.org/toc/2073-4360Coil to globule transition in poly(N-isopropylacrylamide) aqueous solutions was studied using spin probe continuous-wave electronic paramagnetic resonance (CW EPR) spectroscopy with an amphiphilic TEMPO radical as a guest molecule. Using Cu(II) ions as the “quencher” for fast-moving radicals in the liquid phase allowed obtaining the individual spectra of TEMPO radicals in polymer globule and observing inhomogeneities in solutions before globule collapsing. EPR spectra simulations confirm the formation of molten globules at the first step with further collapsing and water molecules coming out of the globule, making it denser.Ekaterina M. ZubanovaSergei V. KostjukPeter S. TimashevYury A. RochevAlexander I. KokorinMikhail Ya. MelnikovElena N. GolubevaMDPI AGarticlethermoresponsive polymerselectronic paramagnetic resonancespin probenitroxidescoil to globuleOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3829, p 3829 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermoresponsive polymers electronic paramagnetic resonance spin probe nitroxides coil to globule Organic chemistry QD241-441
spellingShingle	thermoresponsive polymers electronic paramagnetic resonance spin probe nitroxides coil to globule Organic chemistry QD241-441 Ekaterina M. Zubanova Sergei V. Kostjuk Peter S. Timashev Yury A. Rochev Alexander I. Kokorin Mikhail Ya. Melnikov Elena N. Golubeva Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
description	Coil to globule transition in poly(N-isopropylacrylamide) aqueous solutions was studied using spin probe continuous-wave electronic paramagnetic resonance (CW EPR) spectroscopy with an amphiphilic TEMPO radical as a guest molecule. Using Cu(II) ions as the “quencher” for fast-moving radicals in the liquid phase allowed obtaining the individual spectra of TEMPO radicals in polymer globule and observing inhomogeneities in solutions before globule collapsing. EPR spectra simulations confirm the formation of molten globules at the first step with further collapsing and water molecules coming out of the globule, making it denser.
format	article
author	Ekaterina M. Zubanova Sergei V. Kostjuk Peter S. Timashev Yury A. Rochev Alexander I. Kokorin Mikhail Ya. Melnikov Elena N. Golubeva
author_facet	Ekaterina M. Zubanova Sergei V. Kostjuk Peter S. Timashev Yury A. Rochev Alexander I. Kokorin Mikhail Ya. Melnikov Elena N. Golubeva
author_sort	Ekaterina M. Zubanova
title	Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title_short	Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title_full	Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title_fullStr	Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title_full_unstemmed	Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title_sort	inhomogeneities in pnipam aqueous solutions: the inside view by spin probe epr spectroscopy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d0ced68ddb8e4f53ae8404d9acdb7641
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Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy

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