期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 331, 期 -, 页码 269-275出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2012.11.053
关键词
Nanoparticle stabilization; Nanocomposite; Superparamagnetism; Blocking temperature; Zero field cooled/field cooled measurement
资金
- Fonds der Chemischen Industrie (FCI)
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.
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