화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.26, No.4, 355-363, November, 2014
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Rheological characterization of polyethylene glycol based TiO2 nanofluids
Kerim Yapici1, 2, †, Nese K. Cakmak2, Naciye Ilhan2, and Yusuf Uludag3
  • 1Department of Nanotechnology Engineering, Cumhuriyet University, 58140 Sivas, Turkey
  • 2Department of Chemical Engineering, Cumhuriyet University, 58140 Sivas, Turkey
  • 3Department of Chemical Engineering, Middle East Technical University, 06800 Ankara, Turkey
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Rheological characterization of TiO2 nanoparticle dispersions in polyethylene glycol (PEG 200) is presented over 1-10 wt% particle mass fraction range in terms of shear viscosity, thixotropy and linear viscoelasticity. A stress controlled rheometer fitted by a cone-and-plate system was employed for the rheological measurements between -10℃ and 40℃. The non-linear viscoelastic experiments revealed that TiO2-PEG 200 nanofluid exhibits a shear thinning behavior when particle mass fraction exceeds 1%. No appreciable change in the shear viscosity versus shear rate behavior was detected over the course of four days of dispersion storage. At high particle concentrations the dispersions had a yield stress that was determined by fitting the results through Herschel-Bukley model. Within the studied range of particle concentration, no evidence of thixotropic behavior was observed. In addition, relative viscosity measured at high shear region was found to be independent of the temperature. On the other hand, strong temperature dependency was observed at low shear region particularly at high temperatures. Storage and loss moduli of the TiO2-PEG 200 nanofluid were determined by frequency sweep measurements with applied stresses in the linear viscoelastic region. It was found that when the applied stress is lower than the corresponding yield stress TiO2-PEG 200 nanofluid showed a gel structure especially at high particle mass concentration.
Keywords:TiO2 nanoparticles;nanofluids;non-Newtonian fluid;rheology
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