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Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments

In this study, multi-walled carbon nanotubes (MWCNTs) were chemically modified using three acid treatment methods to introduce the surface oxygen functional group (SOFG). The presence of SOFG on the MWCNTs has been characterized by Fourier Transform Infrared (FTIR) spectroscopy. Morphology, structur...

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Main Authors:	Abdullah, Norli, Norizan, Mohd Nurazzi, Janudin, Nurjahirah, Mohd Kasim, Noor Azilah, Mohd Saidi, Norshafiqah, Osman, Mohd Junaedy, Mohamad, Imran Syakir
Format:	Article
Language:	English
Published:	MDPI 2022
Online Access:	http://eprints.utem.edu.my/id/eprint/26322/2/CHARACTERIZATIONS_OF_MWCNTS_NANOFLUIDS_ON_THE_EFFE-COMPRESSED_COMPRESSED%20%281%29-COMPRESSED.PDF http://eprints.utem.edu.my/id/eprint/26322/ https://www.mdpi.com/2079-4991/12/7/1071/htm
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spelling	my.utem.eprints.263222023-03-06T12:32:14Z http://eprints.utem.edu.my/id/eprint/26322/ Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments Abdullah, Norli Norizan, Mohd Nurazzi Janudin, Nurjahirah Mohd Kasim, Noor Azilah Mohd Saidi, Norshafiqah Osman, Mohd Junaedy Mohamad, Imran Syakir In this study, multi-walled carbon nanotubes (MWCNTs) were chemically modified using three acid treatment methods to introduce the surface oxygen functional group (SOFG). The presence of SOFG on the MWCNTs has been characterized by Fourier Transform Infrared (FTIR) spectroscopy. Morphology, structural and thermal properties were performed using Field Emission Scanning Electron Microscopy (FESEM), Raman spectroscopy, and Thermogravimetric analysis (TGA), respectively. The result shows that the modification with acid treatment significantly affects the degree of defects and surface group functionality of surface oxidized MWCNTs from method B. The preparation of nanofluids using MWCNTs produced from method B (MWCNT-MB) was prepared using two different parameters: with and without polyvinylpyrrolidone (PVP) as surfactant. The experiment was conducted by setting variable carbon particle concentration from 0.1 wt.% to 1.0 wt.%, and the amount of PVP is 10% of carbon particles at different temperatures (6 ◦C, 25 ◦C, 40 ◦C). Based on visual observation, the dispersion of carbon particles was enhanced by the presence of PVP as the stabilizing agent. The thermal conductivity performance of nanofluids revealed that the surface oxidized MWCNTs with PVP show enhanced thermal conductivity compared to the nanofluid containing MWCNTs without PVP. The improvement contributes to this in terms of stability and homogenization of nanoparticles. Hence the improved distribution of MWCNTs in water-based media improves thermal conductivity. These promising properties of MWCNTs in water-based fluids would enable the nanofluids to be used in heat transfer fluid and cooling applications. MDPI 2022-04 Article PeerReviewed text en http://eprints.utem.edu.my/id/eprint/26322/2/CHARACTERIZATIONS_OF_MWCNTS_NANOFLUIDS_ON_THE_EFFE-COMPRESSED_COMPRESSED%20%281%29-COMPRESSED.PDF Abdullah, Norli and Norizan, Mohd Nurazzi and Janudin, Nurjahirah and Mohd Kasim, Noor Azilah and Mohd Saidi, Norshafiqah and Osman, Mohd Junaedy and Mohamad, Imran Syakir (2022) Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments. Nanomaterials, 12 (7). pp. 1-26. ISSN 2079-4991 https://www.mdpi.com/2079-4991/12/7/1071/htm 10.3390/nano12071071
institution	Universiti Teknikal Malaysia Melaka
building	UTEM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknikal Malaysia Melaka
content_source	UTEM Institutional Repository
url_provider	http://eprints.utem.edu.my/
language	English
description	In this study, multi-walled carbon nanotubes (MWCNTs) were chemically modified using three acid treatment methods to introduce the surface oxygen functional group (SOFG). The presence of SOFG on the MWCNTs has been characterized by Fourier Transform Infrared (FTIR) spectroscopy. Morphology, structural and thermal properties were performed using Field Emission Scanning Electron Microscopy (FESEM), Raman spectroscopy, and Thermogravimetric analysis (TGA), respectively. The result shows that the modification with acid treatment significantly affects the degree of defects and surface group functionality of surface oxidized MWCNTs from method B. The preparation of nanofluids using MWCNTs produced from method B (MWCNT-MB) was prepared using two different parameters: with and without polyvinylpyrrolidone (PVP) as surfactant. The experiment was conducted by setting variable carbon particle concentration from 0.1 wt.% to 1.0 wt.%, and the amount of PVP is 10% of carbon particles at different temperatures (6 ◦C, 25 ◦C, 40 ◦C). Based on visual observation, the dispersion of carbon particles was enhanced by the presence of PVP as the stabilizing agent. The thermal conductivity performance of nanofluids revealed that the surface oxidized MWCNTs with PVP show enhanced thermal conductivity compared to the nanofluid containing MWCNTs without PVP. The improvement contributes to this in terms of stability and homogenization of nanoparticles. Hence the improved distribution of MWCNTs in water-based media improves thermal conductivity. These promising properties of MWCNTs in water-based fluids would enable the nanofluids to be used in heat transfer fluid and cooling applications.
format	Article
author	Abdullah, Norli Norizan, Mohd Nurazzi Janudin, Nurjahirah Mohd Kasim, Noor Azilah Mohd Saidi, Norshafiqah Osman, Mohd Junaedy Mohamad, Imran Syakir
spellingShingle	Abdullah, Norli Norizan, Mohd Nurazzi Janudin, Nurjahirah Mohd Kasim, Noor Azilah Mohd Saidi, Norshafiqah Osman, Mohd Junaedy Mohamad, Imran Syakir Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
author_facet	Abdullah, Norli Norizan, Mohd Nurazzi Janudin, Nurjahirah Mohd Kasim, Noor Azilah Mohd Saidi, Norshafiqah Osman, Mohd Junaedy Mohamad, Imran Syakir
author_sort	Abdullah, Norli
title	Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
title_short	Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
title_full	Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
title_fullStr	Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
title_full_unstemmed	Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments
title_sort	characterizations of mwcnts nanofluids on the effect of surface oxidative treatments
publisher	MDPI
publishDate	2022
url	http://eprints.utem.edu.my/id/eprint/26322/2/CHARACTERIZATIONS_OF_MWCNTS_NANOFLUIDS_ON_THE_EFFE-COMPRESSED_COMPRESSED%20%281%29-COMPRESSED.PDF http://eprints.utem.edu.my/id/eprint/26322/ https://www.mdpi.com/2079-4991/12/7/1071/htm
_version_	1759693065478471680
score	13.211869

Characterizations of MWCNTs nanofluids on the effect of surface oxidative treatments

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