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Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study

Spin probe EPR spectroscopy is currently the only method to quantitatively report on the orientational ordering of graphene oxide membranes. This technique is based on the analysis of EPR spectra of a membrane containing stable radicals sorbed on oxidized graphene planes. The efficiency of the metho...

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Autores principales: Chumakova, Natalia A., Kalai, Tamas, Rebrikova, Anastasiya T., Sár, Cecília, Kokorin, Alexander I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787553/
https://www.ncbi.nlm.nih.gov/pubmed/36557148
http://dx.doi.org/10.3390/membranes12121241
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author Chumakova, Natalia A.
Kalai, Tamas
Rebrikova, Anastasiya T.
Sár, Cecília
Kokorin, Alexander I.
author_facet Chumakova, Natalia A.
Kalai, Tamas
Rebrikova, Anastasiya T.
Sár, Cecília
Kokorin, Alexander I.
author_sort Chumakova, Natalia A.
collection PubMed
description Spin probe EPR spectroscopy is currently the only method to quantitatively report on the orientational ordering of graphene oxide membranes. This technique is based on the analysis of EPR spectra of a membrane containing stable radicals sorbed on oxidized graphene planes. The efficiency of the method depends on the spin probe structure; therefore, it is important to find stable paramagnetic substances that are most sensitive to the alignment of graphene oxide membranes. In the present work, three novel stable nitroxide radicals containing aromatic fragments with two nitrogen atoms were tested as spin probes to study graphene oxide membranes. The spin-Hamiltonian parameters of the radicals in graphite oxide powder and orientational order parameters of the probes inside graphene oxide membrane were determined. The sensitivity of one of these radicals to membrane orientational ordering was found to be higher than for any of spin probes used previously. A likely reason for this higher sensitivity is the presence of heteroatoms which can facilitate interaction between paramagnetic molecules and oxygen-containing groups on the inner surface of the membrane. The new high-sensitivity spin probe may significantly increase the potential of EPR spectroscopy for studying the internal structure of graphene oxide membranes.
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spelling pubmed-97875532022-12-24 Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study Chumakova, Natalia A. Kalai, Tamas Rebrikova, Anastasiya T. Sár, Cecília Kokorin, Alexander I. Membranes (Basel) Article Spin probe EPR spectroscopy is currently the only method to quantitatively report on the orientational ordering of graphene oxide membranes. This technique is based on the analysis of EPR spectra of a membrane containing stable radicals sorbed on oxidized graphene planes. The efficiency of the method depends on the spin probe structure; therefore, it is important to find stable paramagnetic substances that are most sensitive to the alignment of graphene oxide membranes. In the present work, three novel stable nitroxide radicals containing aromatic fragments with two nitrogen atoms were tested as spin probes to study graphene oxide membranes. The spin-Hamiltonian parameters of the radicals in graphite oxide powder and orientational order parameters of the probes inside graphene oxide membrane were determined. The sensitivity of one of these radicals to membrane orientational ordering was found to be higher than for any of spin probes used previously. A likely reason for this higher sensitivity is the presence of heteroatoms which can facilitate interaction between paramagnetic molecules and oxygen-containing groups on the inner surface of the membrane. The new high-sensitivity spin probe may significantly increase the potential of EPR spectroscopy for studying the internal structure of graphene oxide membranes. MDPI 2022-12-08 /pmc/articles/PMC9787553/ /pubmed/36557148 http://dx.doi.org/10.3390/membranes12121241 Text en © 2022 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
Chumakova, Natalia A.
Kalai, Tamas
Rebrikova, Anastasiya T.
Sár, Cecília
Kokorin, Alexander I.
Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title_full Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title_fullStr Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title_full_unstemmed Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title_short Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Study
title_sort novel orientation-sensitive spin probes for graphene oxide membranes study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787553/
https://www.ncbi.nlm.nih.gov/pubmed/36557148
http://dx.doi.org/10.3390/membranes12121241
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