Stability and Rheology of Dilute TiO2 – Water Nanofluids

0358867 - ÚCHP 2012 RIV US eng J - Journal Article
Pěnkavová, Věra - Tihon, Jaroslav - Wein, Ondřej
Stability and Rheology of Dilute TiO2 – Water Nanofluids.
Nanoscale Research Letters. Roč. 6, č. 1 (2011), s. 273. ISSN 1931-7573. E-ISSN 1556-276X
R&D Projects: GA ČR GA104/08/0428; GA ČR GA104/09/0972
Institutional research plan: CEZ:AV0Z40720504
Keywords : nanofluids * zeta potential * aws viscometry
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.726, year: 2011
http://www.nanoscalereslett.com/content/6/1/273

Apparent wall slip (AWS) effect, accompanying flow of colloidal dispersions in confined geometries, can be important for applications of nanofluids in heat transfer and microfluidics. In this contribution, a series of stable dilute TiO2 aqueous dispersions was prepared and tested for possible presence of the AWS effect by using a novel viscometric technique. The nanofluids, prepared from TiO2 rutile or anatase nanopowders by ultrasonic dispersing in water, were stabilized by adjusting pH to maximum zeta potential. The resulting stable nanofluid samples were extremely dilute, below 0.7 vol%. All they manifest Newtonian behavior with the fluidities following the Einstein formula. No case of important slip contribution was detected: the Navier slip coefficient about 2 mm Pa-1s-1 would affect the apparent fluidity data in a 100 mkm gap by less than 1%
Permanent Link: http://hdl.handle.net/11104/0196784