Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: theory and experiments

被引:27
作者
Benelmekki, M. [1 ]
Martinez, Ll M. [2 ]
Andreu, J. S. [3 ,4 ]
Camacho, J. [4 ]
Faraudo, J. [3 ]
机构
[1] Univ Minho, Ctr Fis, P-4710057 Braga, Portugal
[2] Sepmag, E-08290 Barcelona, Spain
[3] Inst Ciencia Mat Barcelona ICMAB CSIC, E-08193 Barcelona, Spain
[4] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain
关键词
SEPARATION;
D O I
10.1039/c2sm25243k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Recent works have demonstrated the exciting possibility of inducing a tunable magnetic behavior in non-magnetic colloids by immersing them in a dispersion of superparamagnetic nanoparticles (NPs). Here we show experimentally that non-magnetic latex particles in a dispersion of superparamagnetic NPs experience a nontrivial, two-step "go and come-back" motion when brought under a uniform magnetic gradient. Our theoretical analysis indicates that the observed motion is due to the combined effect of the behavior of latex particles as magnetic holes and the adsorption of NPs at the latex surface. In agreement with theory, the NPs adsorption has been confirmed in our experiments by three independent experimental techniques (EDS, SEM and electrophoresis).
引用
收藏
页码:6039 / 6047
页数:9
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