Novel Fe@C-TiO2 and Fe@C-SiO2 water-dispersible magnetic nanocomposites

被引：7

作者：

Fleaca, Claudiu Teodor ^{[1
]}

Dumitrache, Florian ^{[1
]}

Morjan, Ion ^{[1
]}

Alexandrescu, Rodica ^{[1
]}

Luculescu, Catalin ^{[1
]}

Niculescu, Ana ^{[1
]}

Vasile, Eugeniu ^{[2
]}

Kuncser, Victor ^{[3
]}

机构：

[1] Natl Inst Plasma Laser & Radiat Phys NILPRP, R-077125 Bucharest, Romania

[2] METAV R&D, Bucharest, Romania

[3] Natl Inst Mat Phys, Bucharest 077125, Romania

来源：

APPLIED SURFACE SCIENCE | 2013年 / 278卷

关键词：

Laser pyrolysis; Iron-based magnetic nanocomposites; Silica or titania shells; NANOPARTICLES; GROWTH;

D O I：

10.1016/j.apsusc.2013.01.172

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the synthesis of novel nanocomposites based on Fe@C nanoparticles obtained from Fe(CO)(5) and C2H4/H-2 by laser pyrolysis technique using a three nozzles injector. The alpha Fe-FexCy@C particles (below 24 nm diameter) were first functionalized with hydrophilic groups using Na carboxymethylcellulose. Oxidic precursors (Si(OC2H5)(4) or Ti(OC2H5)(4)) dissolved in ethanol were mixed with ethanolic suspensions of hydrophilized Fe@C nanoparticles using strong ultrasonication, then with water (at different pH values) and finally the Fe-containing composites were recovered by magnetic separation. The SiO2 and TiO2-coated powders were characterized by XRD, FT-IR and TEM techniques and their magnetic hysteresis curves were recorded at different temperatures. Both composites contain submicron aggregates of Fe@C nanoparticles embedded in/surrounded by a disordered porous oxidic matrix/shell. Near superparamagnetic behavior and room temperature and 26 Am-2/kg (for Fe@C/SiO2) or 57Am(2)/kg (for Fe@C/TiO2) saturation magnetization values were recorded and a blocking temperature around 500K was extrapolated. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：284 / 288

页数：5

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