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Open Access Nano Express

Dependence of viscosity of suspensions of ceramic nanopowders in ethyl alcohol on concentration and temperature

Gaweł Żyła1*, Marian Cholewa1 and Adam Witek2

Author affiliations

1 Department of Physics, Rzeszów University of Technology, Aleja Powstańców Warszawy 6, Rzeszów, 35-905, Poland

2 Institute of Ceramics and Building Materials, Warsaw, 02-676, Poland

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Citation and License

Nanoscale Research Letters 2012, 7:412  doi:10.1186/1556-276X-7-412

Published: 23 July 2012

Abstract

This work presents results of measurements of viscosity of suspensions including yttrium oxide (Y2O3), yttrium aluminum garnet (Y3Al5O12) and magnesium aluminum spinel (MgAl2O4) nanopowders in ethanol. Nanoparticles used in our research were either commercially available (Baikowski) or nanopowders newly developed in the Institute of Ceramics and Building Materials in Warsaw, Poland. The study was conducted in a wide range of shear rates (0.01 to 2,000 s−1) and temperature interval from -15°C to 20°C. A Haake Mars 2 rheometer from Thermo Fisher, Germany, was used in the Biophysics Laboratory at Rzeszów University of Technology. Most of the samples show a non-Newtonian behaviour. It was confirmed with a Rheo-NMR system from Bruker that 10% by weight of Y2O3 suspension is a non-Newtonian fluid. In this work, we also report an unexpected behaviour of the viscosity of some samples (Y2O3 and Y3Al5O12) due to sedimentation effect.

Keywords:
Viscosity dependence; Ceramic nanopowders; Yttrium oxide; YAG; Magnesium aluminum spinel