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Advances in Nano Research Volume 2, Number 2, June 2014 , pages 89-98 DOI: https://doi.org/10.12989/anr.2014.2.2.089 |
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A novel method for the synthesis of nano-magnetite particles |
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Maryam Ghodrati Syahmazgi, Cavus Falamaki and Abbas Sahebghadam Lotfi
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| Abstract | ||
| A novel and simple method for the synthesis of nano-magnetite particles is disclosed. In the novel procedure, Fe2+ is the only source of metal cation. Carboxymethylcellulose (CMC) is used as the structure directing agent. The phase analysis of the nano-particles was performed using XRD and electron diffraction techniques. Size and morphology analysis was performed using light scattering and TEM techniques. The effect of NH4OH solution (32 wt. %) at different CMC concentrations on the size distribution of the final magnetite powders is studied. An optimal base concentration exists for each CMC concentration leading to minimal agglomeration. There exists a minimum CMC concentration (0.0016 wt. %), lower than that no magnetite forms. It is shown that using the new method, it is possible to immobilize a lipase enzyme (Candida Rugosa) with immobilization efficiency larger than 98 % with a loading more than 3 times the reported value in the literature. The latter phenomenon is explained based on the agglomerate state of the nano-particles in the liquid phase. | ||
| Key Words | ||
| chemical synthesis; precipitation; light scattering | ||
| Address | ||
| Maryam Ghodrati Syahmazgi: Biochemistry Department, Islamic Azad University, P.O. Box 19585-466, Tehran, Iran Cavus Falamaki: Chemical Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran Abbas Sahebghadam Lotfi: Biochemistry Department, Tarbiat Modarres University, P.O. Box 14115-115, Tehran, Iran | ||