کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1800364 1524888 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stabilisation effects of superparamagnetic nanoparticles on clustering in nanocomposite microparticles and on magnetic behaviour
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Stabilisation effects of superparamagnetic nanoparticles on clustering in nanocomposite microparticles and on magnetic behaviour
چکیده انگلیسی

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 (TB) and irreversible temperature (Tir) in zero field cooled (ZFC) and field cooled (FC) measurements is discussed in terms of nanoparticle clustering.


► Superparamagnetic nanoparticles were synthesised, dispersed and stabilised.
► Stabilisation is either via a polycarboxylate ether polymer or lactic acid.
► Stabilised nanoparticles were incorporated into silica to form composite particles.
► Depending on the stabilisation, nanoparticle clustering in the composites differed.
► Clustering influences zero field cooled/field cooled magnetic measurements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 331, April 2013, Pages 269–275
نویسندگان
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