Formation of Magnetic FexOy/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Autor:	John G. Stevens, Bing Guo, Hoon Yim, Airat Khasanov
Rok vydání:	2010
Předmět:	Chemistry Iron oxide Nanoparticle Mineralogy Pollution Aerosol Colloid chemistry.chemical_compound Chemical engineering Environmental Chemistry Particle General Materials Science Particle size Silicon oxide Superparamagnetism
Zdroj:	Aerosol Science and Technology. 44:281-291
ISSN:	1521-7388 0278-6826
DOI:	10.1080/02786821003586950
Popis:	In this study, iron silicon oxide particles were generated in a one-step flame assisted spray pyrolysis (FASP) process using H2/air or H2/O2 diffusion flames. A colloidal precursor solution was used, which contained dissolved iron nitrate and stably suspended silica nanoparticles. H2/air flames resulted in magnetic FexOy/silica core-shell particles. There was a correlation between particle size and particle structure; particles larger than 500 nm had the core-shell structure, but smaller particles had non-core-shell structures. H2/O2 flames only resulted in nanoparticles that had non-core-shell structures. The core-shell particles had a iron oxide core that was hermetically enclosed in a uniform silica shell with a typical thickness of approximately 100 nm; they were superparamagnetic with a room-temperature saturation magnetization greater than 24 emu/g. Temperature history of the particles may be used to explain the correlation between flame type and particle structure. The correlation between particle ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::22baa24057e2b4a7442d2c1a1fcd1a60 https://doi.org/10.1080/02786821003586950 Zobrazit plný text záznamu