Effect of aggregates on the magnetization property of ferrofluids: A model of gaslike compression
作者： Jian Li , Yan Huang , Xiaodong Liu , Yueqing Lin , Lang Bai
DOI: 10.1016/J.STAM.2007.04.007
关键词: Microstructure 、 Ferrofluid 、 Materials science 、 Volume fraction 、 Condensed matter physics 、 Surface layer 、 Aggregate structure 、 Colloidal particle 、 Magnetic field 、 Magnetization
摘要: Abstract The effect of field-induced aggregation particles on the magnetization property ferrofluids is investigated. From viewpoint energy, magnetizability more complicated than predicted by Langevin theory because aggregation, i.e., transition ferrofluid microstructure, would consume energy applied magnetic field. For calculating aggregates ferrofluids, a model gaslike compression (MGC) proposed to simulate evolution aggregate structure. In this model, colloidal aggregating in equivalent “gas particles” being compressed entropy change microstructure proportional particle volume fraction φH. On basis known behavior and structure determined from present experiments, φH obtained found depend characteristic parameter γ addition φ strength field H. nonmagnetic surface layer also studied. MGC conforms our experimental results better theory.
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