Properties of carbon nanotube nanofluids stabilized by cationic gemini surfactant

Stable water based nanofluids containing multi-walled carbon nanotubes (MWNTs) were prepared using cationic gemini surfactant as stabilizer. Zeta potential measurements and Fourier transformation infrared spectra were employed to study the absorption mechanisms of the surfactants on the MWNT surface...

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Bibliographic Details
Published in:Thermochimica acta 2010-07, Vol.506 (1), p.62-66
Main Authors: Chen, Lifei, Xie, Huaqing
Format: Article
Language:English
Subjects:
Applied sciences
Cationic
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Gemini surfactant
Heat transfer
Multi wall carbon nanotubes
Multi-walled carbon nanotube
Nanocomposites
Nanofluid
Nanofluids
Nanomaterials
Nanostructure
Properties and use of thermal fluids
Surfactants
Theoretical studies. Data and constants. Metering
Thermal conductivity
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Summary:Stable water based nanofluids containing multi-walled carbon nanotubes (MWNTs) were prepared using cationic gemini surfactant as stabilizer. Zeta potential measurements and Fourier transformation infrared spectra were employed to study the absorption mechanisms of the surfactants on the MWNT surfaces. The stability of the nanofluids was obtained using UV–vis absorption method. Results of thermal conductivity indicate that higher concentration of cationic gemini surfactant is a negative factor in improving the thermal conductivity of nanofluids. Increase of spacer chain length of cationic gemini surfactant gives rise to the sediment of MWNTs in the nanofluids, resulting in decrease of thermal conductivity enhancement of MWNT nanofluids. Mechanical ball-milling technology would be a new method to pretreat the pristine MWNTs, and using this method nanofluids with optimized thermal properties can be obtained.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2010.04.016