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on the electrical and thermal conductivity of nanofluids containing carboxyl-functionalized multi-walled carbon nanotubes

机译：含羧基官能化多壁碳纳米管的纳米流体的电气和导热性

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摘要

In this paper, we present the results on the influence of chemical treatment time on the structure of carboxyl-functionalized MWCNTs (MWCNT-COOH) and their nanofluids. The morphological and structural studies investigated by FTIR, HRTEM and Raman scattering demonstrated that the structural defects of MWCNT-COOH increase with increasing chemical treatment time. Nanofluids containing MWCNT-COOH treated for a longer time showed better stability due to the increasing of COOH functional groups attached to the surface of MWCNTs. The electrical conductivity of the nanofluids increases with increasing CNT concentration and decreases with increasing chemical treatment time. The thermal conductivity of the nanofluids enhanced when increasing CNT concentration and reached the highest value for MWCNT-COOH with 5 h chemical treatment. By using the effective medium theory (EMT) and experimental data fitting, the thermal boundary resistance (TBR) and the thermal boundary conductance (TBC) of MWCNT-COOH/water were found to be 90 x 10(-8) m(2) K W-1 and 1.1 MW m(-2) K-1, respectively. The interfacial layer thermal conductivity (K-i) between CNTs and base fluid was estimated by using Murshed's model. The highest Ki was obtained to be 2.6 W m(-1) K-1 for a nanofluid with 5 h chemical treatment. The results implied that the thermal conductivity of CNT based nanofluids could be improved by increasing the Ki via optimizing of the chemical treatment conditions.
机译：在本文中，我们介绍了化学处理时间对羧基官能化MWCNT（MWCNT-COOH）结构及其纳米流体的影响的结果。 FTIR，HRTEM和拉曼散射研究的形态学和结构研究表明，MWCNT-COOH的结构缺陷随着化学处理时间的增加而增加。含有MWCNT-COOH的纳米流体较长时间处理，由于随着MWCNT表面附着的COOH官能团的增加，由于COOH官能团的增加而呈现更好的稳定性。随着CNT浓度的增加而增加，纳米流体的电导率随着CNT浓度的增加而增加，随着化学处理时间的增加而降低。当增加CNT浓度时，纳米流体的导热率提高，并达到5小时化学处理的MWCNT-COOH的最高值。通过使用有效的介质理论（EMT）和实验数据配件，发现MWCNT-COOH /水的热界电阻（TBR）和热边界电导（TBC）为90×10（-8）m（2） K W-1和1.1 MW M（-2）k-1分别。通过使用Murshed的模型估计CNT和基础流体之间的界面层导热率（K-1）。获得最高的Ki，得到纳米流体的2.6Wm（-1）K-1，具有5小时化学处理。结果暗示通过优化化学处理条件，通过增加ki可以提高CNT基纳米流体的导热率。

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  • 来源
    《RSC Advances》 |2017年第79期|共10页
  • 作者

    Pham Van Trinh; Nguyen Ngoc Anh; Nguyen Trong Tam; Nguyen Tuan Hong; Phan Ngoc Hong; Phan Ngoc Minh; Bui Hung Thang;

  • 作者单位

    Vietnam Acad Sci &

    Technol Inst Mat Sci 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Inst Mat Sci 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Grad Univ Sci &

    Technol 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Ctr High Technol Dev 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Inst Mat Sci 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Inst Mat Sci 18 Hoang Quoc Viet Str Hanoi Vietnam;

    Vietnam Acad Sci &

    Technol Inst Mat Sci 18 Hoang Quoc Viet Str Hanoi Vietnam;

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  • 正文语种 eng
  • 中图分类 化学;
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