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Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture

We have studied the oxidation of multi-wall carbon nanotubes (MWCNTs) by boiling them in a nitrating mixture composed of conc. HNO(3)/H(2)SO(4) (v/v = 1/3). By analysis of the morphology and surface physicochemistry of the oxidation products as a function of MWCNT treatment time, we have revealed tw...

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Detalles Bibliográficos
Autores principales: Kolanowska, Anna, Wąsik, Patrycja, Zięba, Wojciech, Terzyk, Artur Piotr, Boncel, Sławomir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9075796/
https://www.ncbi.nlm.nih.gov/pubmed/35542294
http://dx.doi.org/10.1039/c9ra08300f
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author Kolanowska, Anna
Wąsik, Patrycja
Zięba, Wojciech
Terzyk, Artur Piotr
Boncel, Sławomir
author_facet Kolanowska, Anna
Wąsik, Patrycja
Zięba, Wojciech
Terzyk, Artur Piotr
Boncel, Sławomir
author_sort Kolanowska, Anna
collection PubMed
description We have studied the oxidation of multi-wall carbon nanotubes (MWCNTs) by boiling them in a nitrating mixture composed of conc. HNO(3)/H(2)SO(4) (v/v = 1/3). By analysis of the morphology and surface physicochemistry of the oxidation products as a function of MWCNT treatment time, we have revealed two interrelated phenomena. Firstly, the most outer walls were becoming more functionalized with carboxylic groups to the point of quasi-saturation where, secondly, oxidized MWCNTs could be desheathed uncovering the yet non-functionalized wall. These phenomena were manifested by the periodic-like nature of functionalization and de-functionalization. In the products of MWCNT oxidation – the number of graphitized MWCNT walls was determined by HR-TEM while quantification of oxygen functionalities was performed via Boehm titration. The above techniques coupled with the analysis of zeta potential and Raman spectroscopy allowed us to propose a pseudo-1(st) order kinetic model for MWCNT oxidation translatable to other sp(2)-C allotropes. The findings mean that prolonged oxidation does not necessarily yield nanotubes of higher levels of functionalization. The final outcome is of great relevance in all fields of MWCNT applications from medicine to sensors to nanomaterials engineering.
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spelling pubmed-90757962022-05-09 Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture Kolanowska, Anna Wąsik, Patrycja Zięba, Wojciech Terzyk, Artur Piotr Boncel, Sławomir RSC Adv Chemistry We have studied the oxidation of multi-wall carbon nanotubes (MWCNTs) by boiling them in a nitrating mixture composed of conc. HNO(3)/H(2)SO(4) (v/v = 1/3). By analysis of the morphology and surface physicochemistry of the oxidation products as a function of MWCNT treatment time, we have revealed two interrelated phenomena. Firstly, the most outer walls were becoming more functionalized with carboxylic groups to the point of quasi-saturation where, secondly, oxidized MWCNTs could be desheathed uncovering the yet non-functionalized wall. These phenomena were manifested by the periodic-like nature of functionalization and de-functionalization. In the products of MWCNT oxidation – the number of graphitized MWCNT walls was determined by HR-TEM while quantification of oxygen functionalities was performed via Boehm titration. The above techniques coupled with the analysis of zeta potential and Raman spectroscopy allowed us to propose a pseudo-1(st) order kinetic model for MWCNT oxidation translatable to other sp(2)-C allotropes. The findings mean that prolonged oxidation does not necessarily yield nanotubes of higher levels of functionalization. The final outcome is of great relevance in all fields of MWCNT applications from medicine to sensors to nanomaterials engineering. The Royal Society of Chemistry 2019-11-19 /pmc/articles/PMC9075796/ /pubmed/35542294 http://dx.doi.org/10.1039/c9ra08300f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kolanowska, Anna
Wąsik, Patrycja
Zięba, Wojciech
Terzyk, Artur Piotr
Boncel, Sławomir
Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title_full Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title_fullStr Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title_full_unstemmed Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title_short Selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
title_sort selective carboxylation versus layer-by-layer unsheathing of multi-walled carbon nanotubes: new insights from the reaction with boiling nitrating mixture
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9075796/
https://www.ncbi.nlm.nih.gov/pubmed/35542294
http://dx.doi.org/10.1039/c9ra08300f
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