In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances

This study investigated the in-situ growth of carbon nanotubes (CNTs) in silica (SiO2) powder by polymer pyrolysis chemical vapor deposition with a polyethylene glycol (PEG) carbon source and cobalt nitrate catalyst. The mass ratio of PEG:citric acid:cobalt nitrate was determined to control the micr...

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Autores principales:	Shoulei Yang, Sirui Yang, Haiyang Liu, Yinxiao Zhu, Rui Pang
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	in-situ grown cnts polymer pyrolysis chemical vapor deposition dispersion cement-based composite Clay industries. Ceramics. Glass TP785-869
Acceso en línea:	https://doaj.org/article/0b99ba3be0fd409db21197537ed6b79d
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spelling	oai:doaj.org-article:0b99ba3be0fd409db21197537ed6b79d2021-11-04T15:51:55ZIn-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances2187-076410.1080/21870764.2021.2000687https://doaj.org/article/0b99ba3be0fd409db21197537ed6b79d2021-11-01T00:00:00Zhttp://dx.doi.org/10.1080/21870764.2021.2000687https://doaj.org/toc/2187-0764This study investigated the in-situ growth of carbon nanotubes (CNTs) in silica (SiO2) powder by polymer pyrolysis chemical vapor deposition with a polyethylene glycol (PEG) carbon source and cobalt nitrate catalyst. The mass ratio of PEG:citric acid:cobalt nitrate was determined to control the microstructures of the in-situ CNTs. Results indicated that with an increase in the mass ratio of PEG:citric acid:cobalt nitrate, the in-situ generated CNTs content in the SiO2 powder increased, the CNTs diameters (approximately 40 nm) did not significantly change, and the CNTs lengths decreased from 400–800 nm to 200–400 nm. Additionally, the in-situ CNTs that were anchored on the surfaces of SiO2 particles presented fewer defects and a high degree of graphitization. However, when the mass ratio of PEG:citric acid:cobalt nitrate exceeded the critical value, excessive amounts of amorphous carbon grown in situ on SiO2 particles were obtained. The suspension experiments showed that unlike the CNTs/SiO2 powders prepared by a combination of surfactant and ultrasonic methods with commercial CNTs, in-situ CNTs grown in SiO2 powders exhibited improved separation resistance in water. This would favor the uniform dispersion of CNTs within the matrix, improving the performance of nanocarbon-modified cement-based composites.Shoulei YangSirui YangHaiyang LiuYinxiao ZhuRui PangTaylor & Francis Grouparticlein-situ grown cntspolymer pyrolysis chemical vapor depositiondispersioncement-based compositeClay industries. Ceramics. GlassTP785-869ENJournal of Asian Ceramic Societies, Vol 0, Iss 0, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	in-situ grown cnts polymer pyrolysis chemical vapor deposition dispersion cement-based composite Clay industries. Ceramics. Glass TP785-869
spellingShingle	in-situ grown cnts polymer pyrolysis chemical vapor deposition dispersion cement-based composite Clay industries. Ceramics. Glass TP785-869 Shoulei Yang Sirui Yang Haiyang Liu Yinxiao Zhu Rui Pang In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
description	This study investigated the in-situ growth of carbon nanotubes (CNTs) in silica (SiO2) powder by polymer pyrolysis chemical vapor deposition with a polyethylene glycol (PEG) carbon source and cobalt nitrate catalyst. The mass ratio of PEG:citric acid:cobalt nitrate was determined to control the microstructures of the in-situ CNTs. Results indicated that with an increase in the mass ratio of PEG:citric acid:cobalt nitrate, the in-situ generated CNTs content in the SiO2 powder increased, the CNTs diameters (approximately 40 nm) did not significantly change, and the CNTs lengths decreased from 400–800 nm to 200–400 nm. Additionally, the in-situ CNTs that were anchored on the surfaces of SiO2 particles presented fewer defects and a high degree of graphitization. However, when the mass ratio of PEG:citric acid:cobalt nitrate exceeded the critical value, excessive amounts of amorphous carbon grown in situ on SiO2 particles were obtained. The suspension experiments showed that unlike the CNTs/SiO2 powders prepared by a combination of surfactant and ultrasonic methods with commercial CNTs, in-situ CNTs grown in SiO2 powders exhibited improved separation resistance in water. This would favor the uniform dispersion of CNTs within the matrix, improving the performance of nanocarbon-modified cement-based composites.
format	article
author	Shoulei Yang Sirui Yang Haiyang Liu Yinxiao Zhu Rui Pang
author_facet	Shoulei Yang Sirui Yang Haiyang Liu Yinxiao Zhu Rui Pang
author_sort	Shoulei Yang
title	In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
title_short	In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
title_full	In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
title_fullStr	In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
title_full_unstemmed	In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
title_sort	in-situ growth of cnts in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/0b99ba3be0fd409db21197537ed6b79d
work_keys_str_mv	AT shouleiyang insitugrowthofcntsinsilicapowderbypolymerpyrolysischemicalvapordepositionandtheirseparationresistances AT siruiyang insitugrowthofcntsinsilicapowderbypolymerpyrolysischemicalvapordepositionandtheirseparationresistances AT haiyangliu insitugrowthofcntsinsilicapowderbypolymerpyrolysischemicalvapordepositionandtheirseparationresistances AT yinxiaozhu insitugrowthofcntsinsilicapowderbypolymerpyrolysischemicalvapordepositionandtheirseparationresistances AT ruipang insitugrowthofcntsinsilicapowderbypolymerpyrolysischemicalvapordepositionandtheirseparationresistances
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In-situ growth of CNTs in silica powder by polymer pyrolysis chemical vapor deposition and their separation resistances

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