The effect of silica mass ratio on pore structure and magnetic characteristics of Fe3O4@SiO2 core-shell nanoparticles

Document Type : Article

Authors

1 Department of Physics, Faculty of Mathematics and Sciences, Universitas Negeri Surabaya (Unesa), Surabaya-Indonesia

2 Department of Chemistry, FSAD, Institut Teknologi Sepuluh Nopember (ITS), Surabaya-Indonesia

3 Department of Physics, Universitas Negeri Malang (UM), Malang-Indonesia

Abstract

The fabrication of Fe3O4@SiO2 core-shell was prepared from natural iron sand as Fe3O4 core resource and in situ SiO2-coating method. The Fe3O4@SiO2 was synthesized via an ultrasonic route with various ratios of tetraethyl orthosilicate (TEOS) to evaluate the core-shell's morphological, pore structure, and magnetic properties. XRD and FTIR were used to characterize the prepared Fe3O4 and Fe3O4@SiO2. SEM analyzed the effect of the TEOS on the particle size, and TEM observed the morphology of core-shell and shell thickness. The BET data revealed that Fe3O4@SiO2(65) exhibited a larger diameter pore size of 88.17 nm and eight times higher BET surface area (80.23 m2/g) than Fe3O4@SiO2(45) (27.69 nm; 10.5 m2/g). The VSM data indicated that the more TEOS addition on Fe3O4@SiO2 caused the decrease of magnetization value but still gave good magnetic properties from 95.32 emu/g for Fe3O4@SiO2(45) to 17.02 emu/g for Fe3O4@SiO2(65). The study found that the higher content of SiO2 reduced the agglomeration of the Fe3O4 core indicated by no hysteresis loop on the N2 adsorption-desorption curve of Fe3O4@SiO2(65), resulting in core-shell material with better properties in higher specific surface area, average pore size and volume for further application.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 27 January 2024

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