Superparamagnetism of magnetite nanoparticles: Dependence on surface modification

被引:403
作者
Mikhaylova, M
Kim, DK
Bobrysheva, N
Osmolowsky, M
Semenov, V
Tsakalakos, T
Muhammed, M
机构
[1] Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden
[2] St Petersburg State Univ, Dept Chem, St Petersburg 198904, Russia
[3] Rutgers State Univ, Sch Engn, Dept Ceram & Mat Engn, Piscataway, NJ 08854 USA
关键词
D O I
10.1021/la035648e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Superparamagnetic iron oxide nanoparticles (SPION) with an average particle diameter of 6 nm are prepared by controlled chemical coprecipitations. Colloidal suspensions of noninteracting SPION, where the surface has been modified with three different types of biocompatible substances, namely, starch, gold (An), and methoxypoly(ethylene glycol) (MPEG) have been fabricated via three different techniques. Starch-coated SPION are prepared by coprecipitation in a polymeric matrix, Au-coated SPION are fabricated by the microemulsion method, and MPEG-coated SPION are prepared using the self-assembly approach. The magnetic nanoparticles form a core-shell structure, and the magnetic dipole-dipole interactions are screened by a layer of coating agents. The amounts of coating agents and SPION are indirectly calculated from the thermogravinietric analysis and superconducting quantum interference device measurements by assuming passive oxidation on the surface of the SPION, and the other conditions do not influence the measurements. The dependency of the spectral characteristics of Mossbauer spectroscopy as a function of an external magnetic field H-ext is measured to investigate the effect of dipole-dipole screening of the different coating layers on the SPION. Uncoated SPION show a stable magnetic moment under H-etx and the superparamagnetic (SPM) fraction transforms to a ferrimagnetic state. Starch and Au-coated SPION retain the SPM fraction according to Mossbauer spectroscopy and magnetization measurements. MPEG-coated SPION show hyperfine magnetic structure without the quadrupole effect with increasing the value of the blocking temperature.
引用
收藏
页码:2472 / 2477
页数:6
相关论文
共 33 条
[11]   Magnesium interdiffusion and surface oxidation in magnetite epitaxial films grown on MgO(100). [J].
Handke, B ;
Haber, J ;
Slezak, T ;
Kubik, M ;
Korecki, J .
VACUUM, 2001, 63 (1-2) :331-336
[12]   THE MAGNETIZATION OF MAGNETIC LIQUIDS CONTAINING AMORPHOUS FE1-XCX PARTICLES [J].
JOHANSSON, C ;
HANSON, M ;
HENDRIKSEN, PV ;
MORUP, S .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1993, 122 (1-3) :125-128
[13]   Magnetic properties of magnetic liquids with iron-oxide particles - the influence of anisotropy and interactions [J].
Johansson, C ;
Hanson, M ;
Pedersen, MS ;
Morup, S .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1997, 173 (1-2) :5-14
[14]   MAGNETIC PROPERTIES OF STABLE DISPERSIONS OF SUBDOMAIN MAGNETITE PARTICLES [J].
KAISER, R ;
MISKOLCZY, G .
JOURNAL OF APPLIED PHYSICS, 1970, 41 (03) :1064-+
[15]   Magnetic properties of iron dextran [J].
Kilcoyne, SH ;
Gorisek, A .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 177 :1457-1458
[16]   Superparamagnetic iron oxide nanoparticles for bio-medical applications [J].
Kim, DK ;
Zhang, Y ;
Voit, W ;
Kao, KV ;
Kehr, J ;
Bjelke, B ;
Muhammed, M .
SCRIPTA MATERIALIA, 2001, 44 (8-9) :1713-1717
[17]   Synthesis and characterization of surfactant-coated superparamagnetic monodispersed iron oxide nanoparticles [J].
Kim, DK ;
Zhang, Y ;
Voit, W ;
Rao, KV ;
Muhammed, M .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2001, 225 (1-2) :30-36
[18]  
KIM DK, 2001, MAT RESOURCE SOC S P, V676
[19]   Size effects in epitaxial films of magnetite [J].
Korecki, J ;
Handke, B ;
Spiridis, N ;
Slezak, T ;
Flis-Kabulska, I ;
Haber, J .
THIN SOLID FILMS, 2002, 412 (1-2) :14-23
[20]   Correlation of the coagulation rates and toxicity of biocompatible ferromagnetic microparticles [J].
Kuznetsov, OA ;
Brusentsov, NA ;
Kuznetsov, AA ;
Yurchenko, NY ;
Osipov, NE ;
Bayburtskiy, FS .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 194 (1-3) :83-89