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Submicrometer‐Sized Spherical Iron Oxide Particles Fabricated by Pulsed Laser Melting in Liquid
Author(s) -
ISHIKAWA YOSHIE,
KOSHIZAKI NAOTO,
PYATENKO ALEXANDER
Publication year - 2016
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11898
Subject(s) - materials science , iron oxide , irradiation , oxide , melting point , solvent , particle (ecology) , fluence , particle size , acetone , analytical chemistry (journal) , thermal decomposition , toluene , chemical engineering , inorganic chemistry , chemistry , organic chemistry , physics , oceanography , nuclear physics , engineering , metallurgy , composite material , geology
SUMMARY Submicrometer‐sized spheres of iron oxide were obtained by laser irradiation of cuboidal Fe 3 O 4 particles dispersed in ethanol, acetone, and toluene. Sphere formation condition and sphere size are explained based on a relationship between particle size and laser fluence required for solid–liquid phase transition of Fe 3 O 4 , which is calculated by equating the melting enthalpy and the optically absorbed energy derived from Mie theory. FeO was partially formed by laser irradiation at 200 mJ pulse −1 cm −2 in ethanol, acetone, and toluene. The reduction reaction is not simply due to thermal decomposition of Fe 3 O 4 , but due to the reduction by chemical species generated from solvent surrounding Fe 3 O 4 particles melted by laser irradiation. Ethanol was more reductive than the other two solvents; Fe is formed even at 200 mJ pulse −1 cm −2 . This is probably due to chemical reactivity of produced iron oxides and chemical species transiently generated from solvent.