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Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants

Multi-wall carbon nanotubes (MWCNTs) exhibit exceptional mechanical and electrical properties and can be used to improve the mechanical and piezoelectric properties of cement-based materials. In the present study, the effect of different MWCNT concentrations as well as different types of surfactants...

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Autores principales: Metaxa, Zoi S., Boutsioukou, Spyridoula, Amenta, Maria, Favvas, Evangelos P., Kourkoulis, Stavros K., Alexopoulos, Nikolaos D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8953568/
https://www.ncbi.nlm.nih.gov/pubmed/35335840
http://dx.doi.org/10.3390/nano12061031
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author Metaxa, Zoi S.
Boutsioukou, Spyridoula
Amenta, Maria
Favvas, Evangelos P.
Kourkoulis, Stavros K.
Alexopoulos, Nikolaos D.
author_facet Metaxa, Zoi S.
Boutsioukou, Spyridoula
Amenta, Maria
Favvas, Evangelos P.
Kourkoulis, Stavros K.
Alexopoulos, Nikolaos D.
author_sort Metaxa, Zoi S.
collection PubMed
description Multi-wall carbon nanotubes (MWCNTs) exhibit exceptional mechanical and electrical properties and can be used to improve the mechanical and piezoelectric properties of cement-based materials. In the present study, the effect of different MWCNT concentrations as well as different types of surfactants and a superplasticizer were examined to reinforce, at the nanoscale, a white cement mortar typically used for the restoration of monuments of cultural heritage. It was shown that sodium dodecylbenzenesulfonate (SDBS) and Triton X-100 surfactants slightly decreased the white cement mortars’ electrical resistivity (by an average of 10%), however, the mechanical properties were essentially decreased by an average of 60%. The most suitable dispersion agent for the MWCNTs proved to be the superplasticizer Ceresit CC198, and its optimal concentration was investigated for different MWCNT concentrations. Carboxylation of the MWCNT surface with nitric acid did not improve the mechanical performance of the white cement nanocomposites. The parametric experimental study showed that the optimum combination of 0.8 wt% of cement superplasticizer and 0.2 wt% of cement MWCNTs resulted in a 60% decrease in the electrical resistivity; additionally, the flexural and compressive strengths were both increased by approximately 25% and 10%, respectively.
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spelling pubmed-89535682022-03-26 Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants Metaxa, Zoi S. Boutsioukou, Spyridoula Amenta, Maria Favvas, Evangelos P. Kourkoulis, Stavros K. Alexopoulos, Nikolaos D. Nanomaterials (Basel) Article Multi-wall carbon nanotubes (MWCNTs) exhibit exceptional mechanical and electrical properties and can be used to improve the mechanical and piezoelectric properties of cement-based materials. In the present study, the effect of different MWCNT concentrations as well as different types of surfactants and a superplasticizer were examined to reinforce, at the nanoscale, a white cement mortar typically used for the restoration of monuments of cultural heritage. It was shown that sodium dodecylbenzenesulfonate (SDBS) and Triton X-100 surfactants slightly decreased the white cement mortars’ electrical resistivity (by an average of 10%), however, the mechanical properties were essentially decreased by an average of 60%. The most suitable dispersion agent for the MWCNTs proved to be the superplasticizer Ceresit CC198, and its optimal concentration was investigated for different MWCNT concentrations. Carboxylation of the MWCNT surface with nitric acid did not improve the mechanical performance of the white cement nanocomposites. The parametric experimental study showed that the optimum combination of 0.8 wt% of cement superplasticizer and 0.2 wt% of cement MWCNTs resulted in a 60% decrease in the electrical resistivity; additionally, the flexural and compressive strengths were both increased by approximately 25% and 10%, respectively. MDPI 2022-03-21 /pmc/articles/PMC8953568/ /pubmed/35335840 http://dx.doi.org/10.3390/nano12061031 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
Metaxa, Zoi S.
Boutsioukou, Spyridoula
Amenta, Maria
Favvas, Evangelos P.
Kourkoulis, Stavros K.
Alexopoulos, Nikolaos D.
Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title_full Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title_fullStr Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title_full_unstemmed Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title_short Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants
title_sort dispersion of multi-walled carbon nanotubes into white cement mortars: the effect of concentration and surfactants
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8953568/
https://www.ncbi.nlm.nih.gov/pubmed/35335840
http://dx.doi.org/10.3390/nano12061031
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