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.
Official URL: http://www.nanoscalereslett.com/content/6/1/273
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-Î¼m gap by less than 1%.
|Subjects:||Physical Science > Nano objects|
Material Science > Nanostructured materials
Material Science > Nanochemistry
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Chemistry|
|Deposited On:||18 Oct 2011 08:20|
|Last Modified:||18 Oct 2011 08:20|
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