Nanocomposite Magneto-Rheological Fluids with Uniformly Dispersed Fe Nanoparticles
Abstract:A systematic study of the magnetic and rheological properties of magneto-rheological (MR) fluids containing micron-size and nano-size iron particles is presented. The MR fluids were prepared with hydraulic oil as the carrier liquid and lecithin as an effective surfactant medium that promotes uniform particle dispersion. Magnetic measurements on micron-, hybrid- (nano+micron), and nanoMR fluids clearly indicate that the partial replacement of the micron-size particles by nanoparticles results in a better suspension and robust chain formation under applied external magnetic fields. For nano-MR fluids, the measured yield stress was found to be lower than micron-MR fluids. However, better flow properties and sharper magnetic switching make nanoparticle-based MR fluids appealing for microfluidics device applications where higher yield stress is not required.
Document Type: Research Article
Publication date: January 1, 2004
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