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

Yoshio Kobayashi, Toshimi Fujisaku, Tetsuya Ayame, Tomohiko Nakagawa, Kohsuke Gonda, Motohiro Takeda, Noriaki Ohuchi, Eiichi Mine, Tsutomu Takezawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A method for magnetite-deposition on AgI-SiO 2 core-shell (AgI/SiO 2) 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/SiO 2 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/SiO 2 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/SiO 2 particles ([AgI] = 2.0×10 -4 M). Tiny magnetite nanoparticles were deposited on the AgI/SiO 2 particle surface. The magnetite-deposited AgI/SiO 2 particles were ferromagnetic, and were drawn close to magnet. These results confirmed that the homogeneous precipitation method was suitable to magnetite-deposition.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Nanoscience, Engineering and Technology, ICONSET 2011
Pages114-118
Number of pages5
DOIs
Publication statusPublished - 2011
EventInternational Conference on Nanoscience, Engineering and Technology, ICONSET 2011 - Chennai, India
Duration: 2011 Nov 282011 Nov 30

Publication series

NameProceedings of the International Conference on Nanoscience, Engineering and Technology, ICONSET 2011

Other

OtherInternational Conference on Nanoscience, Engineering and Technology, ICONSET 2011
CountryIndia
CityChennai
Period11/11/2811/11/30

Keywords

  • AgI
  • Core-shell
  • homogeneous precipitation method
  • particle
  • silica

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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