| Tsouris, C., and T.C. Scott, "Flocculation of
Paramagnetic Particles in a Magnetic Field," J. Colloid Interface Sci., 171,
319-330 (1995). Summary: Flocculation of paramagnetic particles under the strong magnetic fields is
reported in this paper. Experimental information is obtained from fluctuation and
intensity measurements of light passing through a particle suspension introduced in a
uniform magnetic field. The magnetic field of strength up to 6 T is generated by a
cryogenic magnet operating at liquid helium boiling temperature. The phenomenon is
analyzed by a Brownian flocculation model in which hydrodynamic, van der Waals,
double-layer, and magnetic forces are incorporated for the estimation of the particle
flocculation rate. A population balance is employed in conjunction with the flocculation
model to predict the evolution of the particle state with time. The effects of such
important parameters as strength of the magnetic field, magnetic susceptibility of the
particles, particle size, and zeta potential are investigated. Results show that particle
size and magnetic susceptibility each play an important role in the selective flocculation
of particles of different properties. |