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Preparation of Fe3O4-MWCNTs Nanocomposites by Microwave Assisted Polyol Method and Their MRI Enhancement Properties

Author: ChenYuXin
Tutor: GuHongChen
School: Shanghai Jiaotong University
Course: Polymer Chemistry and Physics
Keywords: Iron oxide Microwave Polyol method Magnetic carbon nanotube composites
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 52
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Abstract


Magnetic Fe 3 O 4 nano-particles and Fe of 3 O 4 magnetic nanoparticles coated carbon nanotube composite material due to its excellent physical and chemical properties, has been widespread concern, and magnetic resonance imaging, bio-magnetic separation, targeted drug delivery and Hyperthermia biomedical field have a wide range of applications. Currently, the preparation of magnetic Fe 3 O 4 nanoparticles and Fe 3 O 4 magnetic nanoparticles coated carbon nanotube complexes, the main co-precipitation method, high-temperature thermal decomposition method and polyol co-precipitation synthesized sample particle size heterogeneity, the particle size is hard to regulate, and because of the low degree of crystallization, leading to its saturation The relatively weak magnetization; high temperature prepared by thermal decomposition of the sample surface is hydrophobic, require complicated surface modification operation; polyol method developed in recent years can be prepared by uniform particle size, high degree of crystallinity, good surface hydrophilicity samples, and can regulate the particle size of the sample, to meet the different uses for the diversity requirements of the sample, but the above-mentioned preparation methods tend to require a longer reaction time, the production efficiency is very low. Firstly, on the basis of the Yadong Yin et al invention polyol reduction, fast and efficient heating by microwave radiation were prepared of polypropylene acid coated Fe of 3 O 4 nano-particles, the preparation time from a few hours reduced to 20min, and proved using microwave radiation heating method can greatly improve the efficiency of the samples prepared. The improved preparation efficiency, but also to ensure the product has a uniform particle size, high degree of crystallinity and superparamagnetic and good colloidal stability, excellent physical and chemical characteristics. The systematic study of the influence of the nature of the solvent and the alkali added in an amount of product, verify the reducing enhancement of the particle size of the product with a polyol solvent, the greater the amount of alkali added, the greater the particle size of the sample is also, and by these methods to achieve Fe Controllable Preparation 3 O 4 nanoparticles. Successfully verified microwave radiation heating methods can improve the efficiency of the premise of the the the the polyol prepared Fe 3 O 4 nano-particles, further strong acid oxidation by microwave heating the pretreatment of the fast, high-quality multi-walled carbon nanotubes, and simultaneously get rid of the impurities in the sample, but also to have good colloidal stability due to surface functionalization. We use microwave heating polyol Rapid Preparation of Fe 3 O 4 nanoparticles coated carbon nanotubes functionalized multi-walled carbon nanotube composite objects, the method of heating by microwave radiation and the reaction time is shortened by a few hours to 15min, to obtain a particle size of 3-5nm Fe 3 O 4 nanoparticles coated magnetic carbon nanotubes complex, the magnetic carbon nanotubes composite superparamagnetic good colloidal stability at room temperature, the transverse relaxation rate of 146.46 Fe mM-1S-1, better than the commercialization T2 contrast agent Feridex (110 Fe mM-1S-1), the gradation of the magnetic resonance imaging of a sample varies with the changes in the concentration of the sample, these results show that the enhanced T2 resonance imaging contrast agent field application prospect. Finally, the reaction temperature on the morphology and magnetic properties, and found that as the reaction temperature increases, coated in the carbon tube surface Fe 3 O the 4 The particle size of the nanoparticles gradually increased, the saturation magnetization of the sample is also gradually increased, Therefore, it can be prepared by adjusting the reaction temperature, the different morphology and magnetic properties of samples, in order to meet the diversity requirements of the application.

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