Open AccessInteraction and assembly of non-magnetic spheres and magnetic nanoparticles dispersed in magnetic fluid
Author(s) -
Deng Hai-dong,
Hai Li
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.127501
Subject(s) - polystyrene , spheres , materials science , magnetic nanoparticles , magnetic field , condensed matter physics , nanotechnology , nanoparticle , composite material , physics , polymer , quantum mechanics , astronomy
In this paper, we systematically investigate the dynamics of non-magnetic spheres (polystyrene spheres) and magnetic nanoparticles dispersed in Fe3O4 magnetic colloid under an externally applied magnetic field. It is found that the polystyrene spheres form chain-like structures when the direction of magnetic field is parallel to the sample cell. The whole dynamic process of polystyrene spheres in the magnetic field can be characterized by a fast interaction between polystyrene spheres and magnetic nanoparticles and a slow interaction among polystyrene chain-like structures respectively. When a magnetic field is applied in the direction perpendicular to the sample cell, polystyrene spheres can be assembled into a short-range ordered two-dimensional structure due to the repulsive interaction among polystyrene spheres. Once the applied magnetic field excesses a critical level, a flower-shaped complex structure can be formed due to the attractive interaction between the polystyrene sphere and the magnetic cluster.