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Adsorption of Sodium Oleate on Nano-sized Fe3O4 Particles Prepared by Coprecipitation

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Nano-sized Fe3O4 is one of the most important magnetic materials wildly applied in various fields and sodium oleate (SO) is a very useful anionic surfactant for dispersing nano-particles in aqueous solution in the practical applications of nano-particles. However, studies of its adsorption properties on Fe3O4 nano-particles are scarce. This work firstly characterized the shape, size and phase structure of the nano-sized magnetite (Fe3O4) particles synthesized with chemical co-precipitation in aqueous solution by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Then, the UV absorbance behaviors of sodium oleate (SO) aqueous solution were explored and the adsorption of SO on nano-sized Fe3O4 particles was carried out. Based on the UV characteristics of SO, the isothermal adsorption of SO on these magnetite nanoparticles was measured under pH 10.5 at room temperature. Meanwhile, Fourier-transform infrared spectroscopy (FT-IR) was used to confirm the attachment of SO on the magnetic particles. Moreover, the adsorption equilibrium isotherm was fitted well by the Langmuir mode and proved that this adsorption was a monolayer adsorption.

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Keywords: Absorption; Adsorption; Fe3O4 nanoparticles; Sodium oleate; UV Spectrophotometry

Document Type: Research Article

Publication date: 01 August 2007

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  • Current Nanoscience publishes authoritative reviews and original research reports, written by experts in the field on all the most recent advances in nanoscience and nanotechnology. All aspects of the field are represented including nano- structures, synthesis, properties, assembly and devices. Applications of nanoscience in biotechnology, medicine, pharmaceuticals, physics, material science and electronics are also covered. The journal is essential to all involved in nanoscience and its applied areas.
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