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Design and Evaluation of Carbon Nanotube Based Nanofluids for Heat Transfer Applications

Published online by Cambridge University Press:  29 May 2013

Sathya P. Singh ,
Nader Nikkam ,
Morteza Ghanbarpour ,
Muhammet S. Toprak ,
M. Muhammed  and
Rahmatollah Khodabandeh
Sathya P. Singh
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Nader Nikkam
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Morteza Ghanbarpour
Affiliation:
Department of Energy Technology, KTH-Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Muhammet S. Toprak*
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
M. Muhammed
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE-16440 Kista, Stockholm, Sweden.
Rahmatollah Khodabandeh
Affiliation:
Department of Energy Technology, KTH-Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
*
*Email: toprak@kth.se
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Abstract

The present work investigates the fabrication, thermal conductivity (TC) and rheological properties of water based carbon nanotubes (CNTs) nanofluids (NFs) prepared using a two-step method. As-received (AR) CNTs heated and the effect of heat treatment was studied using X-ray diffraction and thermogravimetric analysis. The AR-CNTs and heat-treated CNTs (HT-CNTs) were dispersed with varying concentration of surface modifiers Gum Arabic (GA) and TritonX-100 (TX) respectively. It was found that heat treatment of CNTs effectively improved the TC and influenced rheological properties of NFs. Scanning electron microscopy analysis revealed TX modified NFs showed better dispersion ability compared to GA. Surface modification of the CNTs was confirmed by Fourier Transformation Infrared (FTIR) analysis. Zeta potential measurement showed the stability region for GA modified NFs in the pH range of 5-11, whereas pH was between 9.5-10 for TX NFs. The concentration of surface modifier plays an extensive role on both TC and rheological behavior of NFs. A maximum TC enhancement of 10% with increases in viscosity around 2% for TX based HT-CNTs NFs was measured. Finally comparison of experimental TC results with the predicted values obtained from a model demonstrated inadequacy of the predictive model for CNT NFs system.

Keywords

thermal conductivityfluidnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium V – Nanoscale Thermoelectric Materials, Transport Phenomena, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 143 - 148
Copyright
Copyright © Materials Research Society 2013 

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References

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