Silica-coating of AgI semiconductor nanoparticles

Kobayashi, Yoshio; Misawa, Kiyoto; Takeda, Motohiro; Kobayashi, Masaki; Satake, Masanobu; Ohuchi, Noriaki; Kasuya, A.; Konno, Mikio

doi:10.1016/j.colsurfa.2004.10.007

Cited by 41 publications

(23 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the silica nuclei probably aggregated and formed the gel network. Journal of the Ceramic Society of Japan 119 [6] 397-401 2011 solution. The particles had a size of 60.9 « 11.2 nm, which was close to that prior to the concentrating process [ Fig.…”

Section: Characterizationmentioning

confidence: 99%

“…19)23) A freshly prepared AgClO 4 aqueous solution and a KI aqueous solution were added to water at 3.9 © 10 ¹4 M AgClO 4 and 7.8 © 10 ¹4 M KI (Ag + /I ¹ molar ratio: 1/2) under vigorous stirring at 20°C, which resulted in an AgI concentration of 3.9 © 10 ¹4 M in the AgI nanoparticle colloid solution. Immediately after the mixing, color of the solution turned yellow, which implied formation of AgI nanoparticles.…”

Section: Preparation Of Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of silica-coated AgI nanoparticles by an amine-free process and their X-ray imaging properties

Ayame

Kobayashi

Nakagawa

et al. 2011

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

AgI nanoparticles coated with silica shell (AgI/SiO 2 ) were prepared with an amine-free process, i.e. a modified Stöber method. A colloid solution of 3.9 © 10 ¹4 M AgI nanoparticles was prepared mixing silver perchlorate at 3.9 © 10 ¹4 M and potassium iodide at 7.8 © 10 ¹4 M. A silica-coating was performed at 4.5 © 10 ¹6 M 3-mercaptopropyltrimethoxysilane, 0.1 © 10 ¹3 2.0 © 10 ¹3 M NaOH, 1125 M H 2 O, and 0.4 © 10 ¹3 80 © 10 ¹3 M tetraethylorthosilicate (TEOS) in the presence of 1.0 © 10 ¹4 M AgI nanoparticles in ethanol. The AgI/SiO 2 particles with a size of 53.2 « 9.3 nm and an AgI core size of 13.5 « 4.2 nm were prepared at 1.2 © 10 ¹3 M NaOH, 15 M H 2 O, and 4.0 © 10 ¹3 M TEOS. The AgI concentration of 1.0 © 10 ¹4 M in the as-prepared colloid solution was increased up to an AgI concentration of 0.32 M by salting-out and centrifugation. The coreshell structure of AgI/ SiO 2 particles was undamaged, and the colloid solution was still colloidally stable, even after the condensation. The concentrated AgI/SiO 2 colloid solution showed a high-contrast X-ray image, and its computed tomography value was 2908 « 37 HU. Internal organs in a mouse could be imaged injecting the concentrated colloid solution into it.

show abstract

Section: Characterizationmentioning

confidence: 99%

Section: Preparation Of Materialsmentioning

confidence: 99%

Preparation of silica-coated AgI nanoparticles by an amine-free process and their X-ray imaging properties

Ayame

Kobayashi

Nakagawa

et al. 2011

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

show abstract

“…The synthesis of SAgINPs was carried out according to the methods described in a previous study (Kobayashi et al 2004). Colloids of AgI nanoparticles were prepared by mixing AgClO 4 and KI solution vigorously at room temperature.…”

Section: Synthesis Of Silica-coated Agi Nanoparticlesmentioning

confidence: 99%

“…Silica coating is thought to reduce this toxicity and also confer multifunctionality on nanoparticles. Silica-coated AgI nanoparticles (SAgINPs) were developed to insulate biological systems from the functional core of nanoparticles (Kobayashi et al 2004(Kobayashi et al , 2010(Kobayashi et al , 2011. This study evaluated the potential of SAgINPs as a contrast medium and investigated their biological distribution and dynamics along with verifying contrast enhancement.…”

mentioning

confidence: 99%

Development of Silica-Coated Silver Iodide Nanoparticles and Their Biodistribution

Sakurai

Tada

Gonda

et al. 2012

Tohoku J. Exp. Med.

Self Cite

View full text Add to dashboard Cite

Nanomaterials have great potential in the field of medicine and have been studied extensively. In a previous study, we addressed the potential of silver iodide (AgI) as X-ray contrast media, because it possessed high imaging ability in the measurement by X-ray computed tomography (X-CT) in vitro, and its surface can be modified with many functional groups. We developed the method of silica coating to make AgI nanoparticles more stable and uniform in size. However, the safety and metabolism of nanoparticles in vivo remains to be determined. The objective of the present study was to evaluate the in vivo biodistribution of silica-coated AgI nanoparticles (SAgINPs). X-CT, transmission electron microscopy (TEM), and inductively coupled plasma atomic emission spectrometry (ICP-AES) were performed prior to and at intervals following the intravenous administration of SAgINPs to rats and rabbits. ICP-AES is a spectral technique that can determine the presence and concentrations of metal samples. The X-CT study showed long-period enhancement in the liver and spleen, but not in the bladder of rats. The TEM study demonstrated that SAgINPs were found in hepatocytes. Using ICP-AES, Ag was detected in the bile juice of rabbits, but not found in the urine of these animals, suggesting that SAgINPs are excreted via the liver. This study shows the quantitative biodistribution of silica-coated nanoparticles for the first time, indicating that our silica coating technique is useful for development of nanoparticles with hepatic excretion. In conclusion, the SAgINPs may provide X-ray contrast media with high imaging ability and biocompatibility.

show abstract

“…Our group has also employed silica-coating of various types of particles with seeded polymerization techniques [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Silica-coating of fluorescent polystyrene microspheres by a modified Stöber method and their stability against photobleaching

et al. 2005

Self Cite

View full text Add to dashboard Cite

Submicron-sized polystyrene spheres incorporating fluorescence dyes (fluorescent microspheres) were coated with silica by means of a seeded polymerization technique based on the Stöber method. Silica-coating of the fluorescent microspheres with a size of 100 nm was performed in the presence of 0 -10 g/l polyvinylpyrrolidone (PVP), 1 -13 mol/l water, 0 -0.8 mol/l aq. ammonia and 0.00038 -0.2 mol/l tetraethoxyorthosilicate (TEOS). The addition of PVP was found to suppress the generation of free silica particles and produced no shell-free fluorescent microspheres improving the uniformity of shell thickness of silicacoated fluorescent microspheres. Silica shell thickness increased from 11 to 63 nm with increasing TEOS concentration at 10 g/l PVP, 0.4 mol/l aq. ammonia and 11 mol/l water. Silica-coated fluorescent microspheres showed more stable fluorescence to laser-irradiation than uncoated fluorescent microspheres.

show abstract

Silica-coating of AgI semiconductor nanoparticles

Cited by 41 publications

References 17 publications

Preparation of silica-coated AgI nanoparticles by an amine-free process and their X-ray imaging properties

Preparation of silica-coated AgI nanoparticles by an amine-free process and their X-ray imaging properties

Development of Silica-Coated Silver Iodide Nanoparticles and Their Biodistribution

Silica-coating of fluorescent polystyrene microspheres by a modified Stöber method and their stability against photobleaching

Contact Info

Product

Resources

About