Loading...

Synthesis and analysis of the properties of ferro-fluids

Maleki Jirsaraei, N ; Sharif University of Technology | 2010

1312 Viewed
  1. Type of Document: Article
  2. DOI: 10.1109/ICONN.2010.6045188
  3. Publisher: 2010
  4. Abstract:
  5. We report the rheological properties of ferro-fluid (FF) containing iron oxide nano-particles. At first, a FF was synthesized by using chemical co-precipitaton[1]. The microstructure study using SEM revealed that the FF contained nano-particles with the mean particle size of 35nm. The XRD study revealed that we have well crystallized structures of magnetite; they appeared to be approximately single crystalline structures. The rheological results proved that the FF has non Newtonian behavior, it is a shear thinning fluid in all magnetic fields, Moreover, the magnetic field increases the viscosity in a definite shear rate due to the nano-particles agglomerations and formation of chain-like clusters. It was concluded that the FF underwent the separation phase condensation at magnetic fields higher than about 100 kA/m. In this case that the instrument reveals negative viscosity in the low shear rates, a phenomenon reported in some articles previously in the case of oscillating magnetic field, but In our case the magnetic field is constant but the ferro-fluid is under rotation
  6. Keywords:
  7. Chain-like cluster ; Crystallized structure ; Ferrofluid ; Mean particle size ; Negative viscosity ; Non-Newtonian behaviors ; Oscillating magnetic fields ; Phase condensation ; Rheological property ; Shear rates ; Shear thinning fluids ; Shear thinninig ; Single-crystalline structures ; Superr paramagnetic ; XRD studies ; Agglomeration ; Fluids ; Iron ores ; Iron oxides ; Magnetic bubbles ; Magnetic fields ; Nanoparticles ; Nanoscience ; Non Newtonian flow ; Paramagnetism ; Phase separation ; Rheology ; Shear deformation ; Viscosity ; Nanomagnetics
  8. Source: ICONN 2010 - Proceedings of the 2010 International Conference on Nanoscience and Nanotechnology, 22 February 2010 through 26 February 2010, Sydney, NSW ; 2010 , Pages 91-93 ; 9781424452620 (ISBN)
  9. URL: http://ieeexplore.ieee.org/document/6045188