Synthesis of high concentration colloid solution of silica-coated agi nanoparticles

Yoshio Kobayashi, Marie Minato, Kazuaki Ihara, Tomohiko Nakagawa, Kohsuke Gonda, Motohiro Takeda, Noriaki Ohuchi, Atsuo Kasuya

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Methods for high concentration silica-coated silver iodide (AgI/SiO2,particles, which could be practically used as X-ray contrast agent, were examined. The first was a single-step method, which was to prepare AgI nanoparticles at an AgI concentration of 5×10-3 M and coat the AgI nanoparticles with silica shell by a Stöber method. The second was a multiple-step method, which was to repeat a step for preparing a AgI/SiO2 particle colloid solution with 10-3 M AgI 5 times for adjusting a final AgI concentration to 5×10-3 M. In the two methods, dominant particle aggregation took place, though core-shell particles were also produced. The third was a salting-out method, which was to salt out AgI/SiO2 particles in their colloid solution prepared at an AgI concentration of 10-3 M, remove supernatant by decantation, and redisperse the particles in a fresh solvent. Consequently, AgI/SiO2 particles with an AgI concentration as high as 0.05 M were successfully prepared with the salting-out method, and their core-shell structure was not damaged during the salting-out.

Original languageEnglish
Pages (from-to)6741-6745
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Issue number8
Publication statusPublished - 2012 Aug


  • AgI
  • Core-Shell
  • Nanoparticle
  • Silica Coating
  • Sol-Gel
  • Stöber Method

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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