Stabilisation effects of superparamagnetic nanoparticles on clustering in nanocomposite microparticles and on magnetic behaviour

被引：26
作者：
Mandel, K. [1 ,2 ]
Hutter, F. [1 ]
Gellermann, C. [1 ]
Sextl, G. [1 ,2 ]
机构：
[1] Fraunhofer Inst Silicate Res, ISC, D-97082 Wurzburg, Germany
[2] Univ Wurzburg, Chair Chem Technol Mat Synth, D-97070 Wurzburg, Germany
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2013年 / 331卷
关键词：
Nanoparticle stabilization; Nanocomposite; Superparamagnetism; Blocking temperature; Zero field cooled/field cooled measurement; SILICA-NANOPARTICLES; FE3O4; NANOPARTICLES; IRON PARTICLES; MATRIX; RELAXATION; SURFACE; NANOCRYSTALS; SEPARATION;
D O I：
10.1016/j.jmmm.2012.11.053
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Superparamagnetic nanoparticles of magnetite were coprecipitated from iron salts, dispersed with nitric acid and stabilised either by lactic acid (LA) or by a polycarboxylate-ether polymer (MELPERS4343, MP). The differently stabilised nanoparticles were incorporated into a silica matrix to form nanocomposite microparticles. The silica matrix was prepared either from tetraethylorthosilicate (TEOS) or from an aqueous sodium silicate (water glass) solution. Stabilisation of nanoparticles had a crucial influence on microparticle texture and nanoparticle distribution in the silica matrix. Magnetic measurements in combination with transmission electron microscopy (TEM) investigations suggest a uniform magnetic interaction of nanoparticles in case of LA stabilisation and magnetically interacting nanoparticle clusters of different sizes in case of MP stabilisation. Splitting of blocking temperature (T-B) and irreversible temperature (T-ir) in zero field cooled (ZFC) and field cooled (FC) measurements is discussed in terms of nanoparticle clustering. (C) 2012 Elsevier B.V. rights reserved.
引用
收藏
页码：269 / 275
页数：7
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