Brownian relaxation of interacting magnetic nanoparticles in a colloid subjected to a pulsatile magnetic field.

نویسندگان

  • S Sarangi
  • I C Tan
  • A Brazdeikis
چکیده

We have investigated and modeled the effect of interaction among magnetic particles and the magnitude and duration of external applied magnetic field on Brownian relaxation in a colloidal suspension. In the case of interacting magnetic particles, Brownian relaxation depends on the interparticle dipole-dipole interaction, which slows down the overall Brownian relaxation process of magnetic particles in the colloidal suspension. The individual magnetic particle experiences torque when a pulsatile magnetic field is applied. The torque due to the external field randomizes the particle rotation similar to that of the thermal energy. A faster Brownian relaxation is observed when individual magnetic particles are magnetized for a short duration. Magnetizing the magnetic particle for a longer duration suppress the rotational motion hence the effect of torque on Brownian relaxation.

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عنوان ژورنال:
  • Journal of nanoscience and nanotechnology

دوره 11 5  شماره 

صفحات  -

تاریخ انتشار 2011