NDLI: Deposition of magnetite on AgI-silica core-shell particles by homogeneous precipitation method

Content Provider	IEEE Xplore Digital Library
Author	Kobayashi, Y. Fujisaku, T. Ayame, T. Nakagawa, F. Gonda, K. Fakeda, M. Ohuchi, N. Mine, E. Fakezawa, T.
Copyright Year	2011
Description	Author affiliation: Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University, Hitachi, Japan (Kobayashi, Y.; Fujisaku, T.; Ayame, T.) \|\| Tokyo Metropolitan Industrial Technology Research Institute, Japan (Mine, E.; Fakezawa, T.) \|\| Department of Nano-Medical Science, Graduate School of Medicine, Tohoku University, Sendai, Japan (Nakagawa, F.; Gonda, K.; Fakeda, M.; Ohuchi, N.)
Abstract	A method for magnetite-deposition on AgI-SiO2 core-shell (AgI/SiO2) particles is proposed. A colloid solution of $1.0×10^{−3}$ M AgI nanoparticles was prepared mixing silver perchlorate at $1.0×10^{−3}$ M and potassium iodide at $2.0×10^{−3}$ M at 5°C, and then adding $^{−3}-mercaptopropyltrimethoxysilane$ at $4.5×10^{−5}$ M at 20°C. AgI/SiO2 particles with an average size of 42.7±10.3 nm and a AgI core size of 23.5±5.8 nm were prepared using a Stöber method at 20°C in water/ethanol solution with $8.0×10^{−3}$ M tetraethylorthosilicate and $1.1×10^{−3}$ M NaOH in the presence of $1.0×10^{−3}$ M AgI nanoparticles. Preparation of magnetite nanoparticle colloid solution was performed with a homogeneous precipitation method using 5.0 M urea aqueous solution and $1.0×10^{−2}$ M iron chloride aqueous solution with $Fe^{2+}/Fe^{3+}$ molecular ratios of 1/0, 2/1, 1/2 and 0/1 in (50/50) (v/v) water/1-propanol solution at 80°C. Magnetite that revealed ferromagnetic property were produced using the ratios of 1/0, 2/1 and 1/2. Magnetite-deposition on the AgI/SiO2 particles was performed preparing the magnetite by the homogeneous precipitation method using $1.0×10^{−2}$ M iron chloride and 5.0 M urea in the presence of the AgI/SiO2 particles ([AgI] = $2.0×10^{−4}$ M). Tiny magnetite nanoparticles were deposited on the AgI/SiO2 particle surface. The magnetite-deposited AgI/SiO2 particles were ferromagnetic, and were drawn close to magnet. These results confirmed that the homogeneous precipitation method was suitable to magnetite-deposition.
Starting Page	114
Ending Page	118
File Size	697571
Page Count	5
File Format	PDF
ISBN	9781467300711
e-ISBN	9781467300742
DOI	10.1109/ICONSET.2011.6167925
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-28
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon compounds Particle X-ray scattering AgI Atmospheric measurements Magnetic resonance imaging Homogeneous precipitation method Particle measurements Iron Core-shell Silica Saturation magnetization
Content Type	Text
Resource Type	Article

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