FePt nanoparticles have been synthesized using a liquid process, by mixing two precursor liquids: ferric acetyl ferric acetyl acetonate, Fe(acac)3, and platinum acetyl acetonate, Pt(acac)2 in polyol solution of sodium hydroxide at high temperatures. To avoid the agglomeration of the produced particle, aminoethoxy ethanol has been used. The particle size was monodisperse and non- agglomerating. The fraction of Fe in FexPt(100−x) was a linear function of Fe(acac)3 molar fraction. The highest room temperature coercivity (up to 10 kOe) was observed in Fe53Pt47 sample after annealed at 580 °C, which also exhibited the most ordered fct structure.
The preparation of a three-dimensionally (3D) ordered macroporous iron-platinum (FePt) film derived from monodisperse FePt nanoparticles (approximately 3 nm in diameter) and polystyrene latex particles (254 nm in diameter) is described. The prepared film has a hexagonally ordered porous structure and coercivity up to 10 kOe after annealing at a temperature of 600 degrees C. We also found that size of FePt particles was maintained at around 3 nm, even after annealing at a temperature of 600 degrees C.
Yellow pigments with safe characters, higher chroma with vivid yellowish color, higher tinting strength, and better durability are required especially in the field of color materials. In this paper, we prepared yellow composite particles, by coating titanium dioxide submicron particles with organic yellow pigment particles, assisted by methyltriethoxysilane as an adhesive agent. TEM photographs of the yellow composite particles indicated that the organic yellow pigment particles were adhered to the surface of titanium dioxide particles and formed the shell with uneven shape. The performances such as chroma, tinting strength and durability of the composite particles prepared by organic yellow pigment coating were improved to the same or above the level of conventional inorganic heavy metal pigment particles.
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