Inhomogeneities in pnipam aqueous solutions: The inside view by spin probe epr spectroscopy

Ekaterina M. Zubanova; Sergei V. Kostjuk; Peter S. Timashev; Yury A. Rochev; Alexander I. Kokorin; Mikhail Ya Melnikov; Elena N. Golubeva

doi:10.3390/polym13213829

Inhomogeneities in pnipam aqueous solutions: The inside view by spin probe epr spectroscopy

Ekaterina M. Zubanova
, Sergei V. Kostjuk
, Peter S. Timashev
, Yury A. Rochev
, Alexander I. Kokorin
, Mikhail Ya Melnikov
, Elena N. Golubeva

Biomedical Engineering

Lomonosov Moscow State University
Belarussian State University
IM Sechenov Moscow State Medical University
N. N. Semenov Institute of Chemical Physics
Plekhanov Russian University of Economics

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

7 Citations (Scopus)

Abstract

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 fastmoving 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.

Original language	English
Article number	3829
Journal	Polymers
Volume	13
Issue number	21
DOIs	https://doi.org/10.3390/polym13213829
Publication status	Published - 1 Nov 2021

Keywords

Coil to globule
Electronic paramagnetic resonance
Nitroxides
Spin probe
Thermoresponsive polymers

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10.3390/polym13213829

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title = "Inhomogeneities in pnipam aqueous solutions: The inside view by spin probe epr spectroscopy",

abstract = "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 fastmoving 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.",

keywords = "Coil to globule, Electronic paramagnetic resonance, Nitroxides, Spin probe, Thermoresponsive polymers",

author = "Zubanova, \{Ekaterina M.\} and Kostjuk, \{Sergei V.\} and Timashev, \{Peter S.\} and Rochev, \{Yury A.\} and Kokorin, \{Alexander I.\} and Melnikov, \{Mikhail Ya\} and Golubeva, \{Elena N.\}",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = nov,

day = "1",

doi = "10.3390/polym13213829",

language = "English",

volume = "13",

journal = "Polymers",

issn = "2073-4360",

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TY - JOUR

T1 - Inhomogeneities in pnipam aqueous solutions

T2 - The inside view by spin probe epr spectroscopy

AU - Zubanova, Ekaterina M.

AU - Kostjuk, Sergei V.

AU - Timashev, Peter S.

AU - Rochev, Yury A.

AU - Kokorin, Alexander I.

AU - Melnikov, Mikhail Ya

AU - Golubeva, Elena N.

PY - 2021/11/1

Y1 - 2021/11/1

N2 - 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 fastmoving 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.

AB - 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 fastmoving 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.

KW - Coil to globule

KW - Electronic paramagnetic resonance

KW - Nitroxides

KW - Spin probe

KW - Thermoresponsive polymers

UR - https://www.scopus.com/pages/publications/85118699689

U2 - 10.3390/polym13213829

DO - 10.3390/polym13213829

M3 - Article

AN - SCOPUS:85118699689

SN - 2073-4360

VL - 13

JO - Polymers

JF - Polymers

IS - 21

M1 - 3829

ER -

Inhomogeneities in pnipam aqueous solutions: The inside view by spin probe epr spectroscopy

Abstract

Keywords

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