Highly anisotropic rods containing anionic magnetic nanoparticles and organic fluorescent nanospheres (see image) are synthesized using an electrostatic co-assembly strategy in the presence of cationic polyelectrolytes. The hybrid elongated architectures maintain the superparamagnetic properties of the -Fe2O3 constituents, as evidenced by their in-phase response to an external rotating magnetic field.
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Fresnais et al. (2009) studied this question.