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[FeCl_{4}]¯ Ionic Liquid Based Ferrofluids

100%
Parnica J., Kesa P., Kovac J., Timko M., Antalik M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
276-277
EN
Magnetic ionic liquids derived from hydrochloride methyl ester alanine amino acids (AA) and FeCl_{3} were synthesized in ethanol and their magnetic properties were investigated. Iron (III) chloride forms ionic liquid in ethanol at saturated concentrations by the transfer of Cl¯ anion from one molecule of FeCl_{3} to the other molecule with the creation of tetrachloro ferrate anion [FeCl_{4}]¯ as well as dimer [Fe_{2}Cl_{7}]¯. Raman scattering indicates that after addition of hydrochloride methyl ester alanine to ethanol solutions of FeCl_{3} increase the intensities of signal at the frequencies at 318 cm^{-1} and 380 cm^{-1} as markers for the presence of [FeCl_{4}]¯ and [Fe_{2}Cl_{7}]¯ complexes. The magnetization at room temperature showed in both samples a linear dependence on the applied magnetic field. On the other hand, in the Raman scattering experiments the magnetization is smaller for FeCl_{3} sample in the presence of methyl ester alanine.
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Physical Properties of Magnetite Nanoparticles Covered by 11-Mercaptoundecanoic Acid

86%
Timko M., Kopčanský P., Antalik M., Simsikova M., Valusova E., Molcan M., Kováč J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1321-1323
EN
We have investigated the magnetic behavior of magnetite nanoparticles covered by the 11-mercaptoundecanoic acid around magnetite core prepared by a standard co-precipitation method. The particles show superparamagnetic behavior at room temperature, with transition to a blocked state at blocking temperature 91 K estimated from zero field cooled and field cooled at 500 Oe experiment. The hysteresis loop measured at 293 K showed magnetization 32.8 emu/g at 50 kOe without any coercivity. The mean particle size (7.1 nm) was determined by fitting a magnetization curve obtained at 295 K assuming a log-normal size distribution.
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