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Iron oxide nano-composite Particles

Author: FuRong
Tutor: YangWenSheng
School: Jilin University
Course: Physical and chemical
Keywords: Nanocomposites Magnetic Nanoparticles Silica Iron oxide Superparamagnetic Coated Dispersion Aggregates Magnetic content Monodisperse Oleic acid modified Nucleation Particle size Prehydrolysis Particle structure Emulsion Seed emulsion polymerization Pyrolysis method AIBN
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 292
Quote: 1
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Abstract


Superparamagnetic nanoparticles in biotechnology has great application prospects. These applications require superparamagnetic nanoparticles have good biocompatibility solubility, chemical stability , particle dispersion and a higher response sensitivity and an adjustable magnetic particle . But usually get superparamagnetic nanoparticle magnetic response sensitivity is low , vulnerability to environmental erosion. Because silica and polymer materials with good pro -soluble and bio- inert , both of which have been prepared magnetic composite particles of concern . Preparation for the existing magnetic silica nanocomposites technical deficiencies in the second chapter we first propose a simple approximation preparing monodisperse magnetic silica composite particles approach. This method is first prepared by emulsion droplet evaporation techniques have been stably dispersed in the aqueous phase aggregates of Fe3O4 nanoparticles , by affinity after replacement of silicone surfactants in the pre- hydrolysed silica Stober system to ensure the magnetic aggregates coated directly on the obtained particle size uniform magnetic silica nanocomposites . And by regulating the size of aggregates and the effective control of the thickness of the silica shell ultimate particle size and the magnetic substances . We also found that the template cetyl trimethyl ammonium bromide (CTAB) modified aggregates having the template into the system can be obtained dielectric Stober silica-coated magnetic nanoparticles empty . In the third chapter, we obtained by emulsion droplets evaporate magnetic Fe3O4 nanoparticle aggregates above the seed emulsion polymerization process has been Fe3O4/PS composite particles . To avoid self- nucleation of the monomer , we use a hydrophobic initiator AIBN. We found that when the amount of initiator used is low , the particles loose structure ; high particle magnetic particles tend to appear in the side structure of exclusion . We introduce a crosslinking agent inhibits the phenomenon of nuclear magnetic exclusion , while maintaining the amount of initiator and monomer to obtain a uniform distribution of the magnetic particles having a high content of composite magnetic particles .

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