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Stability and characterization of CNT nanofluids using polyvinyl alcohol dispersant


Tam, S. W. and Walvekar, Rashmi Gangasa and Rashidi, Saba and Abdullah, Luqman Chuah and Siddiqui, Mohammad Khalid (2016) Stability and characterization of CNT nanofluids using polyvinyl alcohol dispersant. Journal of Engineering Science and Technology, 11 (spec. Feb.). pp. 1-15. ISSN 1823-4690


In this research, CNT-water nanofluids are synthesized using polyvinyl alcohol (PVA) dispersant where each of the CNT concentration ranging from 0.01 to 0.1 wt% is tested with 0.25 to 3.00 wt% of PVA to optimize the dispersion and stability of nanofluids. The nanofluids are sonicated for 4 hours using ultrasonic water bath and the stability is analyzed using UV-Vis spectrophotometer. The dispersion state of the CNT-water nanofluid is further examined using optical microscope. The stable nanofluids of each CNT concentration identified were then tested for their thermo-physical properties such as thermal conductivity and viscosity with respect to temperature ranging from 25 to 70 °C. The results revealed that 0.5 to 1.5 wt% of PVA dispersant give the optimum stability to the entire range of CNT concentration studied. It was found that the thermal conductivity enhancement of CNT-water nanofluid stabilized by PVA increased non-linearly with temperature. Although PVA suppressed the thermal conductivity of water, the addition of CNT is able to surpass its effect and the results showed that there is approximately 1 to 44 % enhancement for the range of CNT concentration and temperature studied. It was also observed that the viscosity for 1.5 wt% of PVA aqueous solution at 25 °C is approximately 7.5 mPa.s, which is significantly greater than water. However, the presence of CNT nanoparticles is able to reduce the viscosity of its respective optimum PVA solution by 2 to 6% for the entire range of CNT concentrations investigated, showcasing self-lubrication effect of CNT. Moreover, the viscosity of the nanofluids decreases significantly with increasing temperature.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: School of Engineering, Taylor’s University College
Notes: Special issue on the fourth EURECA Conference 2015, 1-2 July 2015
Keywords: Nanofluid; Carbon nanotube; Polyvinyl alcohol; Stability; Thermal conductivity
Depositing User: Nabilah Mustapa
Date Deposited: 05 May 2017 02:32
Last Modified: 05 May 2017 02:32
URI: http://psasir.upm.edu.my/id/eprint/52040
Statistic Details: View Download Statistic

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