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Rheological characterization of polyethylene glycol based TiO$_{2}$ nanofluids

Content Provider	Springer Nature Link
Author	Yapici, Kerim Cakmak, Nese K. Ilhan, Naciye Uludag, Yusuf
Copyright Year	2014
Abstract	Rheological characterization of TiO$_{2}$ 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°C and 40°C. The non-linear viscoelastic experiments revealed that TiO$_{2}$-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 TiO$_{2}$-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 TiO$_{2}$-PEG 200 nanofluid showed a gel structure especially at high particle mass concentration.
Starting Page	355
Ending Page	363
Page Count	9
File Format	PDF
ISSN	1226119X
Journal	Korea-Australia Rheology Journal
Volume Number	26
Issue Number	4
e-ISSN	20937660
Language	English
Publisher	Korean Society of Rheology, Australian Society of Rheology
Publisher Date	2014-11-28
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$ nanoparticles nanofluids non-Newtonian fluid rheology Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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