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Preparation and Properties of Silica-Coated AgI Nanoparticles with a Modified Stober Method

Published online by Cambridge University Press:  01 February 2011

Yoshio Kobayashi ,
Kiyoto Misawa ,
Motohiro Takeda ,
Noriaki Ohuchi ,
Atsuo Kasuya  and
Mikio Konno
Yoshio Kobayashi
Affiliation:
ykoba@mx.ibaraki.ac.jp, Ibaraki University, College of Engineering, 4-12-1 Naka-narusawa-cho, Hitachi, Ibaraki, 316-8511, Japan, +81-294-38-5052, +81-294-38-5078
Kiyoto Misawa
Affiliation:
kiyoto@mickey.che.tohoku.ac.jp, Tohoku University, Graduate School of Engineering, Sendai, 980-8579, Japan
Motohiro Takeda
Affiliation:
motot@d1.dion.ne.jp, Tohoku University, Graduate School of Medicine, Sendai, 980-8574, Japan
Noriaki Ohuchi
Affiliation:
noriakio@mail.tains.tohoku.ac.jp, Tohoku University, Graduate School of Medicine, Sendai, 980-8574, Japan
Atsuo Kasuya
Affiliation:
kasuya@cir.tohoku.ac.jp, Tohoku University, Center for Interdisciplinary Research, Sendai, 980-8578, Japan
Mikio Konno
Affiliation:
konno@mickey.che.tohoku.ac.jp, Tohoku University, Graduate School of Engineering, Sendai, 980-8579, Japan
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Abstract

Iodine compounds have been used as X-ray contrast agents in the field of medicine, because of their low transmittance property for X-ray. The iodine compounds may provoke adverse events as allergic reactions in patients, so that they can not be administered to such people. Core-shell nanoparticles are good candidates for prevention of allergic reactions, because the shell materials can keep the contrast agents from living systems. We have proposed a method for silica-coating of iodine compounds as AgI nanoparticles. In the present work, properties of the silica-coated AgI nanoparticles such as colloidal stability, X-ray absorption and X-ray CT imaging were examined.

Silica-coated AgI nanoparticles were prepared with Stöber method, which was performed with 2.3×10-5 M MPS, 11 M water, 0.01 M DMA and 0.01 M tetraethyl orthosilicate in the presence of 5×10-4 M AgI nanoparticles that were prepared from AgClO4 and KI. The particles had an AgI core size of ca. 15 nm and a silica shell thickness of ca. 20 nm.

Since high iodine concentration in sample solution is desired for practical use as X-ray contrast agents, the colloid of as-prepared coated particles was concentrated with centrifugation. The particle colloid that was concentrated up to an AgI concentration as high as 0.4 M was colloidally stable in saline, and exhibited properties of X-ray absorption and X-ray contrasting comparable to a commercial X-ray contrast agent. Accordingly, the silica-coated AgI nanoparticles prepared in the present work are expected to be applied to a novel X-ray contrast agent.

Keywords

particulatecore/shellsol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1074: Symposium I – Synthesis and Metrology of Nanoscale Oxides and Thin Films , 2008 , 1074-I10-07
Copyright
Copyright © Materials Research Society 2008

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