Properties of biogenic magnetite nanoparticles in the radula of chiton Acanthochiton rubrolineatus lischke

Abstract

The properties of biogenic magnetite (Fe₃O₄) nanoparticles in chiton acanthochiton rubrolineatus lischke were characterized by selected electron diffractometry, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy, Mössbauer spectroscopy and magnetization measurements. Results showed that the magnetite nanoparticles presented crystalline appearance, exhibiting strong absorptions at 595, 1 463, 3 467 cm⁻¹ and weak adsorptions at 1 697, 1 113, 1 048, 848, 445 cm⁻¹ in FT-IR, two partially overlapping sextets in Mössbauer spectrum, and the area ratio of the sextets was 1.08. Also, the particles exhibited ferromagnetic behavior, and had 82 A·m²/kg saturation magnetization, 1.4×10⁴ A/m coercive force and 4.0 A·m²/kg remnant magnetization, respectively. The investigation indicates that the biogenic magnetite nanoparticles mineralized in the chiton are impure in composition and non-stoichiometric.

Keywords

biogenic magnetite nanoparticle / HRTEM / FT-IR / mössbauer spectroscopy / SQUID

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