Polarizable Particle Aggregation Under Rotating Magnetic Fields Using Scattering Dichroism

Numerical and experimental study of a rotating magnetic particle chain in a viscous fluid

“…This dimensionless number leads to the subdivision of the rotating chain dynamics into two global regimes in agreement with the ones proposed by Melle et al [7,9] and Kang et al [14]. If R T < 1, the magnetic torque balances the viscous torque and a steady phase lag is achieved, i.e.…”

“…Melle et al [7] defined a dimensionless number λ that calculates the ratio between magnetic and thermal energies:…”

“…Melle et al [6][7][8][9] studied experimentally the global dynamics of multiple-interacting chainlike structures. They used the Mason number to define the observed dynamics.…”

“…At higher Mason numbers, the induced structures break up. For comparison, Melle et al [7][8][9] conducted particle dynamics simulations. Despite neglecting the effect of hydrodynamic interaction between the particles, the simulations show good agreement with the experiments.…”

Characterization of magnetic nanoparticles using programmed quadrupole magnetic field-flow fractionation

“…The shear flow will therefore exert a torque on a chain of magnetized particles and the magnetic field will exert an opposing torque when the chain is out of alignment with the local field. The related situation of magnetized particle chains subjected to rotating magnetic fields has been studied by Melle and co-workers (Calderón & Melle 2002;Melle et al , 2001Melle et al , 2002aMelle et al ,b, 2003. These studies involved magnetorheological fluids composed of a suspension of approximately 1 mm diameter latex particles that incorporated randomly oriented 1-20 nm magnetite crystals.…”