g-Fe2O3 nanoparticles were obtained by addition of alkali to an aqueous solution of Fe(III) and Fe(II) salts followed by acidification and oxidation with ferric nitrate. After dialysis, the resulting magnetic fluid was mixed with solid dodecyldimethylammonium bromide (DDAB) and the mixture was homogenized by centrifugation. This procedure allowed to obtain a dispersion of g-Fe2O3 nanoparticles in the lyotropic lamellar phase formed by DDAB17.
Positively charged ferrite nanoparticles were introduced in potassium laurate/1-decanol/water liquid crystals leading to the formation of stable ionic ferrofluids. Magnetic nanoparticles (g-Fe2O3) were synthesized by adding alkali to an aqueous solution containing a mixture of ferric and ferrous salts. The resulting colloidal dispersion was subsequently added to potassium laurate/1-decanol/water liquid crystals previously prepared. These ferromagnetic systems appear to be viscous and birefringent fluids, which under the application of a low magnetic field display a reversible orientational transition. Modifications of the phase diagram of the liquid crystalline system due to the nanoparticle presence were observed18'19.
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