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Stability and rheology of dilute TiO2-water nanofluids

Penkavova, Vera and Tihon, Jaroslav and Wein, Ondrej (2011) Stability and rheology of dilute TiO2-water nanofluids. Nanoscale Research Letters, 6 (1). pp. 1-7.

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Official URL: http://www.nanoscalereslett.com/content/6/1/273

Abstract

The apparent wall slip (AWS) effect, accompanying the flow of colloidal dispersions in confined geometries, can be an important factor for the applications of nanofluids in heat transfer and microfluidics. In this study, a series of dilute TiO2 aqueous dispersions were prepared and tested for the possible presence of the AWS effect by means of a novel viscometric technique. The nanofluids, prepared from TiO2 rutile or anatase nanopowders by ultrasonic dispersing in water, were stabilized by adjusting the pH to the maximum zeta potential. The resulting stable nanofluid samples were dilute, below 0.7 vol.%. All the samples manifest Newtonian behavior with the fluidities almost unaffected by the presence of the dispersed phase. No case of important slip contribution was detected: the Navier slip coefficient of approximately 2 mm Pa-1 s-1 would affect the apparent fluidity data in a 100-μm gap by less than 1%.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10907
Deposited By:JNCASR
Deposited On:18 Oct 2011 08:20
Last Modified:18 Oct 2011 08:20

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