Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2018;7:350-5 DOI: 10.1016/j.jmrt.2018.04.012
Original Article
Magnetic filter produced by ZnFe2O4 nanoparticles using freeze casting
Letícia dos Santos Aguileraa,, , Rubens Lincoln Santana Blazutti Marçala, José Brant de Camposb, Marcelo Henrique Prado da Silvaa, André Ben-Hur da Silva Figueiredoa
a Military Institute of Engineering – IME, Mechanical and Materials Engineering Department, Sq General Tibúrcio, 80, Praia Vermelha, Rio de Janeiro, RJ, Brazil
b State University of Rio de Janeiro – UERJ, Mechanical Engineering Department, São Francisco Xavier St, 524, Maracanã, Rio de Janeiro, RJ, Brazil
Received 20 November 2017, Accepted 24 April 2018
Abstract

Zinc ferrite magnetic nanoparticles were synthesized by combustion method and the obtained powders were processed by the freeze casting technique, to produce magnetic filters. Green bodies were obtained by freezing a water-based slurry of nanoparticles and polyethylene glycol (PEG) of molecular mass 8000. The suspension was frozen to −140°C under the cooling rate of 10°C/min. The obtained bodies were sintered at 1300°C during 1h and the X-ray diffraction (XRD) analyses showed ferrite as the only crystalline phase. Scanning electron microscopy (SEM) analyses revealed formation of porous channels in freezing direction and Archimedes’ density measurements showed porosity values ranging from 48.0% to 63.0%, depending on PEG content.

Keywords
Magnetic nanoparticles, Freeze casting, Zinc ferrite nanoparticles, Magnetic filters
J Mater Res Technol 2018;7:350-5 DOI: 10.1016/j.jmrt.2018.04.012
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