Title of the paper:LIGHT SCATTERING BEHAVIOR OF MAGNETIC FIELD INDU ED DIRECTIONAL SELF ASSEMBLY OF IRON OXIDE NANO PARTICLE SUSPENSION

Authors:MADHULEKHA GOGOI and PRITAM DEB

University/Institute: Tezpur University

Abstracts:The magnet ic control on scattering of light by ultra fine iron oxide (Fe2O3) nanoparticles suspended in acarr er liquid was investigated. The light scattering behavior was studied using laser light under the influenc e of a permanent magnet over a rotating frame of reference . When the magnet is rotated continuously from 0 to 360, with respect to the direct ion of the incident laser beam, the scattered light patter n from the sample has the same angular displcement but in counter direct ion to the magnetic field rotation. When external  field is no t applied to the ferrofluid, no other pref erred directional scattering of light is observed. The applied magnetic field induces directional self assembly of magnetic nanoparticles through dipole  dipole interactions. This  finally leads to the format ion of 'nanoparticle grating" and the optical geometry of diffraction grating clearly describes the anomalous scattering behavior of the ferrofluid. Most interestingly, for each complete orientation of the field from 0 to 360, the transmitted light intensity switches between maxima and minima for longitudinal an d transverse applied magnetic fields.

Links to the paper (link to the journal webpage):http://www.worldscientific.com/doi/abs/10.1142/S1793292012500270?af=R