Fe₃O₄.SiO₂: A Study of Structural and Magnetic Properties in Various Volume of Tetraethyl Orthosilicate

Abstract:

Magnetic nanofluids are a category of nanomaterial which exhibit simultaneously liquid and superparamagnetic properties. These nanofluids are magnetic nanoparticles stably dispersed in liquid carrier. Magnetic nanoparticles with and without SiO₂ encapsulation have been successfully synthesized by co-precipitation method from ferrous and ferric precursors dispersed in various liquid. Fe₃O₄ nanoparticles were investigated by Zeta Potential and HR-TEM to determine the stability of nanoparticles, average particles size and microstructure of nanoparticles. From zeta potential measurements, is was found that the value of zeta potential for Fe₃O₄ dispersed in ethanol was ± 0,9 mV, while dispersed in di-water was ± 31,1 mV, indicating that nanoparticles Fe₃O₄ are more stable in DI-water. The increasing of zeta potential indicated the adsorption of negatively charged hydroxyl group to the surface of Fe₃O₄ nanoparticles. From XRD measurements, it was found that crystal quality of Fe₃O₄.SiO₂ sintering at 80 °C decreased by increasing the volume of tetraethyl orthosilicate (TEOS), while that samples sintering at 1000 °C have a good crystal quality with hexagonal phase of a-Fe₂O₃.SiO₂. From SQUID measurements, it was found that samples of Fe₃O₄.SiO₂ sintering at 80 °C with TEOS volumes of 1 ml and 2 ml showed a paramagnetic like while samples of a-Fe₂O₃.SiO₂ sintering at 1000 °C with the same TEOS volume showed ferrimagnetic properties.

• Periodical: Key Engineering Materials (Volume 860)
• Pages: 83-88
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.860.83
• Online since: August 2020
• Authors: Togar Saragi*, Hotmas D. Sinaga, Feni Rahmi, Gustiani A. Pramesti, Adi Sugiarto, Arnold Therigan, Bayu Permana, Norman Syakir, Risdiana Risdiana
• Keywords: Co-Precipitation, Encapsulated, Iron Oxide, Magnetite, Medium Dispersed, Nanofluid

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