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
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
收藏
页码:284 / 288
页数:5
相关论文
共 22 条
[1]   Laser pyrolysis preparation of SiO2-coated magnetic nanoparticles for biomedical applications [J].
Bomatí-Miguel, O ;
Leconte, Y ;
Morales, MP ;
Herlin-Boime, N ;
Veintemillas-Verdaguer, S .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 290 :272-275
[2]   Quasi-Cubic Magnetite/Silica Core-Shell Nanoparticles as Enhanced MRI Contrast Agents for Cancer Imaging [J].
Campbell, Jos L. ;
Arora, Jyoti ;
Cowell, Simon F. ;
Garg, Ashish ;
Eu, Peter ;
Bhargava, Suresh K. ;
Bansal, Vipul .
PLOS ONE, 2011, 6 (07)
[3]   Nearly monodispersed carbon coated iron nanoparticles for the catalytic growth of nanotubes/nanofibres [J].
Dumitrache, F ;
Morjan, I ;
Alexandrescu, R ;
Morjan, RE ;
Voicu, I ;
Sandu, I ;
Soare, I ;
Ploscaru, M ;
Fleaca, C ;
Ciupina, V ;
Prodan, G ;
Rand, B ;
Brydson, R ;
Woodword, A .
DIAMOND AND RELATED MATERIALS, 2004, 13 (02) :362-370
[4]   Parametric studies on iron-carbon composite nanoparticles synthesized by laser pyrolysis for increased passivation and high iron content [J].
Dumitrache, F. ;
Morjan, I. ;
Fleaca, C. ;
Birjega, R. ;
Vasile, E. ;
Kuncser, V. ;
Alexandrescu, R. .
APPLIED SURFACE SCIENCE, 2011, 257 (12) :5265-5269
[5]   Fe-inserted and shell-shaped carbon nanoparticles by cluster-mediated laser pyrolysis [J].
Fleaca, C. T. ;
Dumitrache, F. ;
Morjan, I. ;
Alexandrescu, R. ;
Sandu, I. ;
Luculescu, C. ;
Birjega, S. ;
Prodan, G. ;
Stamatin, I. .
APPLIED SURFACE SCIENCE, 2012, 258 (23) :9394-9398
[6]  
Fujishima A., 2000, J PHOTOCH PHOTOBIO C, V1, P1, DOI DOI 10.1016/S1389-5567(00)00002-2
[7]   Design of multifunctionalized γ-Fe2O3@SiO2 core-shell nanoparticles for enzymes immobilization [J].
Georgelin, Thomas ;
Maurice, Vincent ;
Malezieux, Bernard ;
Siaugue, Jean-Michel ;
Cabuil, Valerie .
JOURNAL OF NANOPARTICLE RESEARCH, 2010, 12 (02) :675-680
[8]   Poly(N-isopropylacrylamide)-coated luminescent/magnetic silica microspheres:: Preparation, characterization, and biomedical applications [J].
Guo, Jia ;
Yang, Wuli ;
Wang, Changchun ;
He, Jia ;
Chen, Jiyao .
CHEMISTRY OF MATERIALS, 2006, 18 (23) :5554-5562
[9]   Synthesis and Covalent Surface Functionalization of Nonoxidic Iron Core-Shell Nanomagnets [J].
Herrmann, Inge K. ;
Grass, Robert N. ;
Mazunin, Dmitry ;
Stark, Wendelin J. .
CHEMISTRY OF MATERIALS, 2009, 21 (14) :3275-3281
[10]   Study on nanomagnets supported TiO2 photocatalysts prepared by a sol-gel process in reverse microemulsion combining with solvent-thermal technique [J].
Li, Hansheng ;
Zhang, Yaping ;
Wang, Shiying ;
Wu, Qin ;
Liu, Changhao .
JOURNAL OF HAZARDOUS MATERIALS, 2009, 169 (1-3) :1045-1053