The influence of large particles and agglomerates on the magnetoviscous effect in ferrofluids

S. Odenbach¹ - K. Raj²

¹ Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Am Fallturm, 28359 Bremen, Germany
² Ferrofluidics Co., 40 Simon St., Nashua, NH 03061, USA

Abstract
Investigations were made to prove the influence of large particles and agglomerates on the magnetic field induced changes of viscosity in suspensions of magnetic nanoparticles. Magnetic liquids from one production batch were subjected to a stepwise refinement process providing samples with different agglomerate content. From magnetic field dependent rheological properties, a clear relation between magnetoviscous effects and the content of large particles and particle agglomerates was obtained. Tables 2, Figs 5, Refs 22.