Particle size analysis of ferrofluids.

J. Embs^1,2 - H. W. Muler⁴ - C. E. Krill III² - F. Meyer³ - H. Natter³ - B. Muler⁴ - S. Wiegand⁴ - M. Luke¹ - R. Hempelmann³ - K. Knorr²

¹ Theoretische Physik, Universität des Saarlandes, Postfach 151150, D-66041
² Technische Physik, Universität des Saarlandes, Postfach 151150, D-66041
³ Physikalische Chemie, Universität des Saarlandes, Postfach 151150, D-66041
⁴ Max-Planck-Institut für Polymerforschung, Ackermannweg 10, D-55128 Mainz

Abstract
We present a comparative experimental investigation of the particle size in ferromagnetic colloids (ferrofluids). The results corroborate a new method, which allows to deduce the core diameter D and the hydrodynamic particle diameter D^hyd simultaneously under in-situ conditions, i.e. without a dilution of the sample. Tables 5, Figs 3, Refs 18.