Sonochemical coating of magnetite nanoparticles with silica

被引：49

作者：

Dang, Feng ^{[1
]}

Enomoto, Naoya ^{[2
]}

Hojo, Junichi ^{[2
]}

Enpuku, Keiji ^{[3
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Moriyama Ku, Nagoya, Aichi 4638560, Japan

[2] Kyushu Univ, Fac Engn, Dept Appl Chem, Fukuoka 8190395, Japan

[3] Kyushu Univ, Res Inst Superconductor Sci & Syst, Fukuoka 8190395, Japan

来源：

ULTRASONICS SONOCHEMISTRY | 2010年 / 17卷 / 01期

关键词：

Sonochemistry; Magnetite; Silica-coating; Nanoparticle; HYPERTHERMIA;

D O I：

10.1016/j.ultsonch.2009.05.013

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Magnetite nanoparticles were coated with silica through the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) under ultrasonic irradiation. The ultrasonic irradiation was used to prevent the agglomeration of the magnetite particles and accelerate the hydrolysis and condensation of TEOS. TEM, DLS, XRF, VSM, TG and sedimentation test were used to characterize the silica-coated magnetite particles. The dispersibility of silica-coated magnetite particles in aqueous solution was improved significantly and the agglomerate particle size was decreased to 110 nm. It was found that the agglomerate particle size of silica-coated magnetite particles was mainly decided by the coating temperature and the pH value in the silica-coating process. The weight ratio of silica in silica-coated magnetite particles was mainly decided by the pH value in the silica-coating process. The dispersibility of silica-coated magnetite particles was mainly decided by the agglomerate particle size of the suspension. The oxidation of magnetite particles in air was limited through the coated silica. The magnetism of silica-coated magnetite particles decreased slightly after silica-coating. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：193 / 199

页数：7

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