Iron oxide nanoparticles (Fe3O4-NPs) were synthesized using chemical coprecipitation method. Fe3O4-NPs are located in\ninterlamellar space and external surfaces of montmorillonite(MMT)as a solid supported at room temperature.The size of magnetite\nnanoparticles could be controlled by varying the amount of NaOH as reducing agent in the medium. The interlamellar space\nchanged from 1.24 nm to 2.85 nm and average diameter of Fe3O4 nanoparticles was from 12.88nm to 8.24 nm. The synthesized\nnanoparticles were characterized using some instruments such as transmission electron microscopy, powder X-ray diffraction,\nenergy dispersive X-ray spectroscopy, field emission scanning electron microscopy, vibrating sample magnetometer, and Fourier\ntransform infrared spectroscopy.
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