Electromagnetically induced nanoparticle rotation controlled by hydrodynamics and by the frequency of the applied field is observed for the presented system of monodomain magnetic core−shell hybrids. The system is composed of nanoscopic cobalt cores decorated with a poly(ε-caprolactone) brush shell with adjustable thickness, immersed in toluene. By using alternating current (AC) susceptometry and magnetic heating calorimetry, a clear dependence of the dynamic magnetic behavior on the shell thickness is observed at constant core properties, that may be of use for microfluidic transport applications.
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Feyen et al. (2008) studied this question.
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