Use of a magnetic fluid for particle size analysis by a sedimentation   method
  A new method of particle size analysis of micrometer-sized particles is discussed. The improved method of sedimentation analysis with magnetic fluids has the potential and versatility to characterize polydisperse systems. 
Yury Dikansky, Arthur Zakinyan, Marita Bedganian
cond-mat.soft cond-mat.mtrl-sci