Author/Authors :
Shariaty-Niassar، M نويسنده Transport Phenomena and Nanotechnology Laboratory (TPNT), Department of Chemical Engineering, School of Eng., University of Tehran, Tehran, Iran , , Safi، M. A نويسنده Transport Phenomena and Nanotechnology Laboratory (TPNT), Department of Chemical Engineering, School of Eng., University of Tehran, Tehran, Iran , , Ghozatloo، A نويسنده Transport Phenomena and Nanotechnology Laboratory (TPNT), Department of Chemical Engineering, School of Eng., University of Tehran, Tehran, Iran,Faculty member ofResearch Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, Tehran, Iran , , Hamidi، A.A نويسنده School of Civil Engineering, Engineering Campus, University Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia ,
Abstract :
In this study, functionalized multi-walled carbon nanotubes using mixed acid treatment
were synthesized using solvothermal method by TiCl4 as a precursor and the thermal
conductivity enhancement of MWNT-TiO2 nanofluids in various temperatures were
compared. The treated nanotubes have been characterized using Fourier Transform
Infrared Spectroscopy (FTIR). Hybrid materials were characterized by X-ray
diffraction (XRD) and scanning electron microscopy (SEM). The results showed that
MWNTs are uniformly decorated with anatase nanocrystals. Temperature effects on
thermal conductivity of MWNT-TiO2 nanofluids at different concentrations have been
studied. The best result showed enhancement of thermal conductivity around 12.1% for
the sample with 0.08 wt% of MWNT-TiO2 compared to distilled water at 36°C and 13.
71% at 52°C. Also, zeta potential of 0.02 wt% nanofluids and particle size distribution
of nanoparticle were measured.
