Abstract
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 language | English |
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Pages (from-to) | 6741-6745 |
Number of pages | 5 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 12 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2012 Aug |
Keywords
- 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