Mechanism for Sustainable Magnetic Nanoparticles under Ambient Conditions

다국어 초록 (Multilingual Abstract)

Iron-based magnetic fluids are widely used in physical applications.
Recently, they have been extended to many biological applications
due to their magnetic and biocompatible properties. However, their
stability under an ambient environment still has not been
systematically investigated. In this report, we present the
oxidation process of magnetic fluids. The oxidation process depends
on the materials that make the nanoparticles, the diffusion of
oxygen atoms from the environment to the magnetic nanoparticles,
which mainly depends on the viscosity of the solution and the
surfactant that coats the nanoparticles. We suggest three ways to
protect nanoparticles from oxidation: (a) using highly viscous
carrier liquid (b) using relevant surfactants and (c) substitution
of Ni²+ and Co²+ for Fe²+ in magnetite. Methods (a)
and (b) are general, so they can be applied for many environmentally
sensitive magnetic fluids. Method (c) is specific for a magnetite
fluid.

다국어 초록 (Multilingual Abstract)

Iron-based magnetic fluids are widely used in physical applications.
Recently, they have been extended to many biological applications
due to their magnetic and biocompatible properties. However, their
stability under an ambient environment still has not been
systematically investigated. In this report, we present the
oxidation process of magnetic fluids. The oxidation process depends
on the materials that make the nanoparticles, the diffusion of
oxygen atoms from the environment to the magnetic nanoparticles,
which mainly depends on the viscosity of the solution and the
surfactant that coats the nanoparticles. We suggest three ways to
protect nanoparticles from oxidation: (a) using highly viscous
carrier liquid (b) using relevant surfactants and (c) substitution
of Ni²+ and Co²+ for Fe²+ in magnetite. Methods (a)
and (b) are general, so they can be applied for many environmentally
sensitive magnetic fluids. Method (c) is specific for a magnetite
fluid.

참고문헌 (Reference)

1 Z. Wang, 123 : 195-, 2002

2 B. Gillot, 25 : 263-, 1978

3 P. S. Sidhu, 39 : 1953-, 1977

4 N. H. Hai, 845 : AA5.44-, 2004

5 I. Nakatani, 122 : 10-, 1993

6 S. Sun, 187 : 1989-, 2000

7 N. A. D. Burke, 37 : 2660-, 2001

8 N. H. Hai, 293 : 293-, 2005

9 T. Misawa, 35 : 4159-, 1973

10 M. H. Sousa, 31 : 185-, 2000

11 D. L. A. Faria, 28 : 873-, 1997

12 R. M. Cornell, "The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses" Wiley-VCH Verlag 2003

13 D. L. Leslie-Pelecky, "Nanobiomagnetics, in Advanced Magnetic Nanostructures, Tertiary Biomagnetics" Kluwer 2005

14 Horng Herng-Er, "Magnetic Nano-Particles and Their Applications in Immunoassays" 한국물리학회 48 (48): 999-1003, 2006

15 R. E. Rosensweig, "Ferrohydrodynamics" Cambridge University Press 1985