Cobalt ferrite (CoFe2O4) nanoparticles (∼12nm diameter) were suspended in the polymer liquid crystal hydroxypropyl cellulose (HPC)∕m-cresol to obtain a new type of ferronematic. Suspension of these particles in 35%wt HPC in m-cresol did not affect the appearance of the liquid crystalline phase as evidenced by small angle x-ray scattering. Magnetic measurements performed on the 35%wt HPC∕m-cresol∕CoFe2O4 ferronematic showed the appearance of ferromagnetic behavior and magnetic hysteresis. In addition, rheometry of the samples showed magnetorheological effect upon application of a dc magnetic field, with the ferronematic having the largest response.
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Santiago-Quiñones et al. (2009) studied this question.
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