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Effect of exfoliated graphene on thermal conductivity enhancements of graphene-ironoxide hybrid nanofluids: Experimental investigation and effective medium theories

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Effect of exfoliated graphene on thermal conductivity enhancements of graphene-ironoxide hybrid nanofluids : Experimental investigation and effective medium theories. / Arifutzzaman, A.; Ismail, A.F.B.; Alam, M.Z.; Khan, A.A.; Saidur, R.

In: Journal of Nano Research, Vol. 67, 30.04.2021, p. 97-114.

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Arifutzzaman, A. ; Ismail, A.F.B. ; Alam, M.Z. ; Khan, A.A. ; Saidur, R. / Effect of exfoliated graphene on thermal conductivity enhancements of graphene-ironoxide hybrid nanofluids : Experimental investigation and effective medium theories. In: Journal of Nano Research. 2021 ; Vol. 67. pp. 97-114.

Bibtex

@article{aa0b4c8a16be4f68935f1b06fa2c7d89,
title = "Effect of exfoliated graphene on thermal conductivity enhancements of graphene-ironoxide hybrid nanofluids: Experimental investigation and effective medium theories",
abstract = "Reasoning of particular mechanism of anomalous thermal transport behaviours are not identified yet for the nanofluids. In this study, iron oxide (Maghemite: MH) and graphene (Gr) flake dispersed deionized water (DW) hybrid nanofluid system were developed for the first time to evaluate the thermal conductivity (TC) enhancements along with the analysis of anomalous TC behavior implementing modified effective medium theories (EMTs). A solvo-thermal two-step method was used to develop the MH nanoparticle and exfoliated Gr flake dispersed hybrid nanofluids with different compositions. Stability of as-prepared hybrid nanofluids were monitored using Ultraviolet-Visible (UV-Vis) spectroscopy. The maximum sedimentation rate was observed ~ 8.4 % after 600 hours. The results showed an overall maximum TC enhancement of ~ 43 % at 25oC. EMTs were modified with the consideration of flat geometry of Gr flake. It is found that, modified EMTs with the crumpled factor (due to the non-flatness or crumple of Gr flake) of ~ 0.205 the predicted effective TC enhancements are agreed with the experimental TC{\textquoteright}s of Gr-NMP/MH-DW hybrid nanofluids samples. The estimated crumple factor value of exfoliated Gr flakes using images analysis was also found nearly similar (~ 0.232). This agreement exposed that, Gr flake{\textquoteright}s with negligible thickness compared to its extremely wide basal plane dimensions and its non-flatness or crumpled geometry in the nanofluids have the leading impacts on the effective TC properties of the Gr flake dispersed nanofluids. This modified model opens the new doors to analyse the insight of the thermophysical properties of various types of nanofluids by introducing potential other parameters. ",
keywords = "Effective Medium Theories, Flake Geometry, Graphene, Maghemite, Nanofluids, Thermal conductivity, Deionized water, Geometry, Iron oxides, Nanofluidics, Seismic waves, Thermal conductivity of liquids, Deionised waters, Effective media theory, Effective thermal conductivity, Exfoliated graphene, Experimental investigations, Flake geometry, Hybrid nanofluid, Maghemites, Thermal conductivity enhancement",
author = "A. Arifutzzaman and A.F.B. Ismail and M.Z. Alam and A.A. Khan and R. Saidur",
year = "2021",
month = apr,
day = "30",
doi = "10.4028/www.scientific.net/JNanoR.67.97",
language = "English",
volume = "67",
pages = "97--114",
journal = "Journal of Nano Research",
issn = "1662-5250",
publisher = "Trans Tech Publications",

}

RIS

TY - JOUR

T1 - Effect of exfoliated graphene on thermal conductivity enhancements of graphene-ironoxide hybrid nanofluids

T2 - Experimental investigation and effective medium theories

AU - Arifutzzaman, A.

AU - Ismail, A.F.B.

AU - Alam, M.Z.

AU - Khan, A.A.

AU - Saidur, R.

PY - 2021/4/30

Y1 - 2021/4/30

N2 - Reasoning of particular mechanism of anomalous thermal transport behaviours are not identified yet for the nanofluids. In this study, iron oxide (Maghemite: MH) and graphene (Gr) flake dispersed deionized water (DW) hybrid nanofluid system were developed for the first time to evaluate the thermal conductivity (TC) enhancements along with the analysis of anomalous TC behavior implementing modified effective medium theories (EMTs). A solvo-thermal two-step method was used to develop the MH nanoparticle and exfoliated Gr flake dispersed hybrid nanofluids with different compositions. Stability of as-prepared hybrid nanofluids were monitored using Ultraviolet-Visible (UV-Vis) spectroscopy. The maximum sedimentation rate was observed ~ 8.4 % after 600 hours. The results showed an overall maximum TC enhancement of ~ 43 % at 25oC. EMTs were modified with the consideration of flat geometry of Gr flake. It is found that, modified EMTs with the crumpled factor (due to the non-flatness or crumple of Gr flake) of ~ 0.205 the predicted effective TC enhancements are agreed with the experimental TC’s of Gr-NMP/MH-DW hybrid nanofluids samples. The estimated crumple factor value of exfoliated Gr flakes using images analysis was also found nearly similar (~ 0.232). This agreement exposed that, Gr flake’s with negligible thickness compared to its extremely wide basal plane dimensions and its non-flatness or crumpled geometry in the nanofluids have the leading impacts on the effective TC properties of the Gr flake dispersed nanofluids. This modified model opens the new doors to analyse the insight of the thermophysical properties of various types of nanofluids by introducing potential other parameters.

AB - Reasoning of particular mechanism of anomalous thermal transport behaviours are not identified yet for the nanofluids. In this study, iron oxide (Maghemite: MH) and graphene (Gr) flake dispersed deionized water (DW) hybrid nanofluid system were developed for the first time to evaluate the thermal conductivity (TC) enhancements along with the analysis of anomalous TC behavior implementing modified effective medium theories (EMTs). A solvo-thermal two-step method was used to develop the MH nanoparticle and exfoliated Gr flake dispersed hybrid nanofluids with different compositions. Stability of as-prepared hybrid nanofluids were monitored using Ultraviolet-Visible (UV-Vis) spectroscopy. The maximum sedimentation rate was observed ~ 8.4 % after 600 hours. The results showed an overall maximum TC enhancement of ~ 43 % at 25oC. EMTs were modified with the consideration of flat geometry of Gr flake. It is found that, modified EMTs with the crumpled factor (due to the non-flatness or crumple of Gr flake) of ~ 0.205 the predicted effective TC enhancements are agreed with the experimental TC’s of Gr-NMP/MH-DW hybrid nanofluids samples. The estimated crumple factor value of exfoliated Gr flakes using images analysis was also found nearly similar (~ 0.232). This agreement exposed that, Gr flake’s with negligible thickness compared to its extremely wide basal plane dimensions and its non-flatness or crumpled geometry in the nanofluids have the leading impacts on the effective TC properties of the Gr flake dispersed nanofluids. This modified model opens the new doors to analyse the insight of the thermophysical properties of various types of nanofluids by introducing potential other parameters.

KW - Effective Medium Theories

KW - Flake Geometry

KW - Graphene

KW - Maghemite

KW - Nanofluids

KW - Thermal conductivity

KW - Deionized water

KW - Geometry

KW - Iron oxides

KW - Nanofluidics

KW - Seismic waves

KW - Thermal conductivity of liquids

KW - Deionised waters

KW - Effective media theory

KW - Effective thermal conductivity

KW - Exfoliated graphene

KW - Experimental investigations

KW - Flake geometry

KW - Hybrid nanofluid

KW - Maghemites

KW - Thermal conductivity enhancement

U2 - 10.4028/www.scientific.net/JNanoR.67.97

DO - 10.4028/www.scientific.net/JNanoR.67.97

M3 - Journal article

VL - 67

SP - 97

EP - 114

JO - Journal of Nano Research

JF - Journal of Nano Research

SN - 1662-5250

ER -