Enhanced thermal conductivity of nanofluids containing Ag/MWNT composites

A green method was applied to prepare composites of multi-walled carbon nanotubes (MWNTs) decorated with silver nanoparticles (Ag-NPs). The MWNTs were functionalized by using mechanical ball milling technology in the presence of ammonium bicarbonate. The functionalized MWNTs were decorated with Ag-N...

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Bibliographic Details
Published in:Powder technology 2012-11, Vol.231, p.18-20
Main Authors: Chen, Lifei, Yu, Wei, Xie, Huaqing
Format: Article
Language:English
Subjects:
ammonium bicarbonate
Applied sciences
Carbon nanotubes
Chemical engineering
Exact sciences and technology
milling
Miscellaneous
Nanocomposites
Nanoparticles
nanosilver
scanning electron microscopy
Silver
Solid-solid systems
thermal conductivity
X-ray diffraction
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Summary:A green method was applied to prepare composites of multi-walled carbon nanotubes (MWNTs) decorated with silver nanoparticles (Ag-NPs). The MWNTs were functionalized by using mechanical ball milling technology in the presence of ammonium bicarbonate. The functionalized MWNTs were decorated with Ag-NPs by the traditional method of using a silver mirror reaction. Scanning electron microscopy (SEM) characterization showed that Ag-NPs distributed uniformly on the walls of MWNTs. The content and size of Ag-NPs could be controlled by adjusting the reducing time. The X-ray diffraction (XRD) patterns demonstrated that the Ag-NPs crystallized well. The resulting Ag/MWNT composites were used to prepare a water based nanofluid. The nanofluid showed higher thermal conductivity compared to that of a nanofluid containing MWNTs with functionalized surfaces. A green method was applied to prepare composites of multi-walled carbon nanotubes (MWNTs) decorated with silver nanoparticles (Ag-NPs). MWNTs were functionalized using mechanical ball milling technology, followed by the traditional method of using silver mirror reaction. Ag-NPs distributed uniformly on the walls of MWNTs. The content and size of Ag-NPs could be controlled by adjusting the reduction time. [Display omitted] ► The method to prepare Ag/MWNT composites is green and cost-efficient. ► Ag-NPs distribution is uniform, and Ag crystallized well. ► The obtained Ag/MWNT composite is an effective heat exchange media.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2012.07.028