Experimental investigation of the rheological behavior and viscosity of decorated multi-walled carbon nanotubes with TiO2 nanoparticles/water nanofluids
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The effects of temperature and concentration on the flow behavior and viscosity of nanofluids containing TiO2 nanoparticles, pristine MWCNTs, oxidized MWCNTs and decorated MWCNTs with TiO2 nanoparticles are experimentally investigated. The results of rheological characteristics of nanofluids revealed that nanofluid of TiO2 nanoparticle and MWCNT–TiO2 exhibits shear thickening or dilatant behavior. In contrast, nanofluids containing pristine and oxidized MWCNTs depict the shear thinning or pseudoplastic behavior. Also results demonstrated that the rheological characteristics of nanofluids are functions of temperature and concentration, whereas the viscosity of all prepared nanofluids decreases with increasing the temperature and decreasing the concentration. In addition, the results show that the oxidation of MWCNTs in nitric acid leads to the reduction in viscosity. The rheological behavior of decorated MWCNTs illustrates that viscosity decreases by increasing the attached TiO2 nanoparticles. TEM results show that TiO2 nanoparticles successfully attached to the outer surface of oxidized MWCNTs.
KeywordsMWCNT TiO2 nanoparticles Flow behavior Viscosity
The authors gratefully acknowledge the help given by Mrs. R. Pesyan from Central Research Laboratory of Ferdowsi University of Mashhad and Mrs. Z. Zaferani from Research Institute of Food Science and Technology (RIFST).
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