Details:

Alternative Title:
Ind Health
Publisher's site:
http://dx.doi.org/
Personal Author:
WU, Wenting ; ICHIHARA, Gaku ; SUZUKI, Yuka ; IZUOKA, Kiyora ; OIKAWA-TADA, Saeko ; ... More +
WU, Wenting ; ICHIHARA, Gaku ; SUZUKI, Yuka ; IZUOKA, Kiyora ; OIKAWA-TADA, Saeko ; CHANG, Jie ; SAKAI, Kiyoshi ; MIYAZAWA, Kunichi ; PORTER, Dale ; CASTRANOVA, Vincent ; KAWAGUCHI, Masami ; ICHIHARA, Sahoko Less -
Description:
Nanomaterials tend to agglomerate in aqueous media, resulting in inaccurate safety assessment of the biological response to these substances. The present study searched for suitable dispersion methods for the preparation of nanomaterial suspensions. Titanium dioxide (TiO2) and zinc oxide (ZnO) nanoparticles were dispersed in a biocompatible dispersion medium by direct probe-type sonicator and indirect cup-type sonicator. Size characterization was completed using dynamic light scattering and transmission electron microscopy. A series of dispersion time and output power, as well as two different particle concentrations were tested. Microscopic contamination of metal titanium that broke away from the tip of the probe into the suspension was found. Size of agglomerated nanoparticles decreased with increase in sonication time or output power. Particle concentration did not show obvious effect on size distribution of TiO2 nanoparticles, while significant reduction of secondary diameter of ZnO was observed at higher concentration. A practicable protocol was then adopted and sizes of well-dispersed nanoparticles increased by less than 10% at 7 d after sonication. Multi-walled carbon nanotubes were also well dispersed by the same protocol. The cup-type sonicator might be a useful alternative to the traditional bath-type sonicator or probe-type sonicator based on its effective energy delivery and assurance of suspension purity.
Subject:
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Metal Nanoparticles
Microscopy, Electron, Transmission
Nanotubes
Particle Size
Sonication
Suspensions
Titanium
Zinc Oxide

Source:
Ind Health. 2014; 52(1):54-65.
Document Type:
Journal Article
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:e5e4ad29c5d46a8026ab89b47736d6c1ccf12cfaf88206f64182cb3250087849
File Type:

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