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: Zubanova, Ekaterina M., Kostjuk, Sergei V., Timashev, Peter S., Rochev, Yury A., Kokorin, Alexander I., Melnikov, Mikhail Ya., Golubeva, Elena N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588346/
https://www.ncbi.nlm.nih.gov/pubmed/34771385
http://dx.doi.org/10.3390/polym13213829
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author Zubanova, Ekaterina M.
Kostjuk, Sergei V.
Timashev, Peter S.
Rochev, Yury A.
Kokorin, Alexander I.
Melnikov, Mikhail Ya.
Golubeva, Elena N.
author_facet Zubanova, Ekaterina M.
Kostjuk, Sergei V.
Timashev, Peter S.
Rochev, Yury A.
Kokorin, Alexander I.
Melnikov, Mikhail Ya.
Golubeva, Elena N.
author_sort Zubanova, Ekaterina M.
collection PubMed
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.
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spelling pubmed-85883462021-11-13 Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy Zubanova, Ekaterina M. Kostjuk, Sergei V. Timashev, Peter S. Rochev, Yury A. Kokorin, Alexander I. Melnikov, Mikhail Ya. Golubeva, Elena N. Polymers (Basel) Article 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. MDPI 2021-11-05 /pmc/articles/PMC8588346/ /pubmed/34771385 http://dx.doi.org/10.3390/polym13213829 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zubanova, Ekaterina M.
Kostjuk, Sergei V.
Timashev, Peter S.
Rochev, Yury A.
Kokorin, Alexander I.
Melnikov, Mikhail Ya.
Golubeva, Elena N.
Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588346/
https://www.ncbi.nlm.nih.gov/pubmed/34771385
http://dx.doi.org/10.3390/polym13213829
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