Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids

In this work, sonication assisted exfoliated Graphene (Gr) was separated into five different suspensions using a systematic centrifugation scheme (4000-500 rpm) for the two different solvents N-Methyl-2-Pyrrolidone (NMP) and N, Ndimethylformamide (DMF). Gr dispersions in deionized water (DW) we...

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Main Authors:	Rahat, Arifutzzaman, Ismail, Ahmad Faris, Yaacob, Iskandar Idris, Khan, Ahsan Ali, Mohammad, Zahangir Alam
Format:	Article
Language:	English
Published:	Research India Publications 2018
Subjects:	TS200 Metal manufactures. Metalworking
Online Access:	http://irep.iium.edu.my/63614/ http://irep.iium.edu.my/63614/ http://irep.iium.edu.my/63614/1/Arif%20published.pdf

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spelling	iium-636142019-03-14T15:44:47Z http://irep.iium.edu.my/63614/ Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids Rahat, Arifutzzaman Ismail, Ahmad Faris Yaacob, Iskandar Idris Khan, Ahsan Ali Mohammad, Zahangir Alam TS200 Metal manufactures. Metalworking In this work, sonication assisted exfoliated Graphene (Gr) was separated into five different suspensions using a systematic centrifugation scheme (4000-500 rpm) for the two different solvents N-Methyl-2-Pyrrolidone (NMP) and N, Ndimethylformamide (DMF). Gr dispersions in deionized water (DW) were prepared by the re-dispersion process with the aid of vacuum filtration. Systematic thermal conductivity (TC) measurements were conducted separately on the prepared Gr dispersion in DW with rising temperature ranging from 25 to 60 oC. Defects in exfoliated Gr samples were identified in terms of intensity ratio of D and G band (ID/IG) of Raman spectroscopy. For a fixed time of sonication values of ID/IG were found considerably higher in higher centrifugation speed (rpm). This phenomenon was perceived for both of the solvents. However, obtained values of ID/IG for the exfoliated Gr in NMP (Gr-NMP) were lower than that of Gr exfoliated by DMF (Gr-DMF). Lowest values of ID/IG found for 500 rpm, were 0.697 and 0.879 for the Gr-NMP and Gr-DMF respectively. Effect of exfoliated Gr defects were evaluated on the TC of Gr dispersed DW nanofluids. At 60 ℃, TC of GrNMP dispersion in DW was obtained 1.146 W/m-K for ID/IG of 0.697 (500 rpm) and 0.935 W/m-K for ID/IG of 0.916 (4000 rpm). Similarly occurrence was also apparent for the Gr-DMF dispersion in DW. Research India Publications 2018 Article PeerReviewed application/pdf en http://irep.iium.edu.my/63614/1/Arif%20published.pdf Rahat, Arifutzzaman and Ismail, Ahmad Faris and Yaacob, Iskandar Idris and Khan, Ahsan Ali and Mohammad, Zahangir Alam (2018) Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids. International Journal of Applied Engineering Research, 13 (7). pp. 4871-4877. ISSN 0973-4562 E-ISSN 0973-9769 https://www.ripublication.com/ijaer18/ijaerv13n7_37.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TS200 Metal manufactures. Metalworking
spellingShingle	TS200 Metal manufactures. Metalworking Rahat, Arifutzzaman Ismail, Ahmad Faris Yaacob, Iskandar Idris Khan, Ahsan Ali Mohammad, Zahangir Alam Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
description	In this work, sonication assisted exfoliated Graphene (Gr) was separated into five different suspensions using a systematic centrifugation scheme (4000-500 rpm) for the two different solvents N-Methyl-2-Pyrrolidone (NMP) and N, Ndimethylformamide (DMF). Gr dispersions in deionized water (DW) were prepared by the re-dispersion process with the aid of vacuum filtration. Systematic thermal conductivity (TC) measurements were conducted separately on the prepared Gr dispersion in DW with rising temperature ranging from 25 to 60 oC. Defects in exfoliated Gr samples were identified in terms of intensity ratio of D and G band (ID/IG) of Raman spectroscopy. For a fixed time of sonication values of ID/IG were found considerably higher in higher centrifugation speed (rpm). This phenomenon was perceived for both of the solvents. However, obtained values of ID/IG for the exfoliated Gr in NMP (Gr-NMP) were lower than that of Gr exfoliated by DMF (Gr-DMF). Lowest values of ID/IG found for 500 rpm, were 0.697 and 0.879 for the Gr-NMP and Gr-DMF respectively. Effect of exfoliated Gr defects were evaluated on the TC of Gr dispersed DW nanofluids. At 60 ℃, TC of GrNMP dispersion in DW was obtained 1.146 W/m-K for ID/IG of 0.697 (500 rpm) and 0.935 W/m-K for ID/IG of 0.916 (4000 rpm). Similarly occurrence was also apparent for the Gr-DMF dispersion in DW.
format	Article
author	Rahat, Arifutzzaman Ismail, Ahmad Faris Yaacob, Iskandar Idris Khan, Ahsan Ali Mohammad, Zahangir Alam
author_facet	Rahat, Arifutzzaman Ismail, Ahmad Faris Yaacob, Iskandar Idris Khan, Ahsan Ali Mohammad, Zahangir Alam
author_sort	Rahat, Arifutzzaman
title	Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
title_short	Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
title_full	Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
title_fullStr	Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
title_full_unstemmed	Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
title_sort	effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids
publisher	Research India Publications
publishDate	2018
url	http://irep.iium.edu.my/63614/ http://irep.iium.edu.my/63614/ http://irep.iium.edu.my/63614/1/Arif%20published.pdf
first_indexed	2023-09-18T21:30:13Z
last_indexed	2023-09-18T21:30:13Z
_version_	1777412460271108096

Effect of exfoliated graphene defects on thermal conductivity of water based graphene nanofluids

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