超順磁性納米粒子簇的制備及弛豫性能研究
[Abstract]:Magnetic nanomaterials have been widely studied in biomedical field because of their unique properties of nanomaterials and magnetic properties. They have become important tools for the diagnosis, treatment, and separation of specific pathogens and biological species. These unique properties of magnetic nanomaterials provide new platforms and opportunities for biomedical applications such as medical imaging, immunoassay, drug delivery, etc. Therefore, the study of magnetic nanocomposites is of great significance. The preparation, structure, morphology, magnetic properties and relaxation properties of magnetic nanocomposites have been systematically studied in this paper. The main research contents are as follows: the preparation and characterization of Fe3O4 nanomaterials Fe3O4 nanoparticles were prepared by pyrolysis of ferric oleate at high temperature. The effects of the amount of oil alcohol and reflux temperature on the particle size were investigated. The samples were characterized by XRD, laser particle size analyzer and magnetometer. The results show that the larger the amount of oil alcohol, the lower the reflux temperature, the smaller the particle size of Fe3O4 nanoparticles. Preparation and characterization of superparamagnetic nanoparticles cluster the functional superparamagnetic nanoparticles cluster of graphene oxide were prepared. The samples were characterized by XRD,TEM,FT-IR,VSM, thermogravimetry. The results showed that the composites were water-soluble and superparamagnetic. The composite was further modified by polyethylene glycol, and the modified composite had good dispersion and stability in PBS buffer solution. Poly (ethylene glycol) functionalized iron trioxide nanocomposites were prepared by mercaptan click-chemical method. The samples were characterized by XRD,TEM,FT-IR,UV-vis,Raman et al. The preparation method is mild, easy to operate and easy to deal with. The prepared product has good stability and dispersion in water or PBS buffer solution. Polyethyleneimine-functionalized iron trioxide nanoparticles cluster was prepared by using 3.4-dihydroxyphenylpropionic acid as the intermediate. The samples were characterized by TEM,FT-IR and Zeta potential and their magnetic properties were tested. The method is simple, the reaction conditions are mild, the preparation time is short, the prepared product has good dispersion and stability in water and PBS solution. The relaxation behavior of dopamine-functionalized iron trioxide nanoparticles and graphene oxide nanoparticles were investigated. The results show that the longitudinal relaxation time of dopamine functionalized iron trioxide nanoparticles decreases with the increase of iron ion concentration and the R1 value of the aqueous solution is 0. 65 m MS-1, at 10 Mt. The time domain signal in water at 10 m T can increase with the increase of polarization time at a certain time, and the reciprocal of spin-lattice relaxation time is 3.05S-1 by fitting formula. The values of r _ 1 and r _ 2 of the larger particle size of graphene oxide nanoparticles were higher than those of the smaller particles.
【學(xué)位授予單位】:西南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TB383.1
【共引文獻(xiàn)】
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