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Construction of Magnetic Microspheres Based on Urea Formaldehyde Template

Author: ZhangLei
Tutor: WanQianHong
School: Tianjin University
Course: Applied Chemistry
Keywords: Magnetic microspheres Magnetic nanocrystals DNA extraction Arsenic treatment Magnetic separation Urea-formaldehyde resin
CLC: TB383.1
Type: PhD thesis
Year: 2008
Downloads: 275
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Abstract


Magnetic nanocrystals and microspheres to promote biotechnology, pharmaceutical technology, catalytic, magnetic resonance imaging, data storage and environmental governance areas of technological innovation and plays an increasingly important role. Although some methods have been developed to manufacture the magnetic microspheres and the nanocrystals, but can be used for the production of high quality, may expand the preparation method is not much. Therefore, it is imperative to develop a new method for the preparation of bulk to meet the needs of the growing use of new, high-quality, low-cost magnetic microspheres were prepared. To this end, we have developed a series of urea-formaldehyde resin template-based magnetic microspheres preparation techniques, preparation of a series of a new type of magnetic microspheres were characterized by SEM, TEM, VSM, XRD, BET, TGA, FTIR, DLS and other means, and the formation of the microspheres do a more systematic study. Achieve results is as follows: 1) the development of new methods to room temperature pot of preparing magnetic microspheres, magnetic nanoparticles embedded in urea-formaldehyde resin was prepared monodisperse superparamagnetic microspheres, and successfully applied to the genome of the human blood DNA extraction. The fluorescent substance may be added during the polymerization to obtain high fluorescence intensity, the dual function of magnetic microspheres. And the formation mechanism of the urea formaldehyde resin microspheres made a systematic study, and the absorbance of the real-time monitoring of the polymerization turbidity change. 2) the development of the the hydrothermal reduction new method for the preparation of magnetic microspheres, the magnetic precursor obtained non-magnetic composite microspheres embedded in the urea-formaldehyde resin and then by hydrothermal reduction to obtain magnetic microspheres obtainable stronger magnetic monodisperse magnetic microspheres, and have been successfully applied to yeast and maize genomic DNA extraction. Also elaborated on the mechanism of the hydrothermal reduction hydroxyl iron oxide. 3) the development of a new method of preparation of a porous iron oxide magnetic microspheres, the method by the ignition of the urea-formaldehyde resin matrix is ??removed from the composite microspheres, to obtain a porous iron sesquioxide microspheres through hydrothermal reduction obtained porous pure iron oxide microspheres. Magnetic microspheres of cubic iron oxide nanoparticles built on porous iron oxide microspheres prepared saturation magnetization up to 72 emu / g. The microspheres of arsenic adsorption model confirmed that the microspheres strong adsorption of arsenic, can be used in water arsenic treatment. The Preliminary Preparation of carbon-coated magnetic microspheres 4) hydrogen reduction method using hydrogen reduction the hydroxyl iron oxide / UF microspheres, magnetic microspheres and novel structure of the iron oxide nanotubes. Preparation of magnetic microspheres by chemical vapor deposition (CVD) method, the carbon-coated magnetic beads and the carbon fiber rods. Carbon-coated magnetic silica microspheres prepared by CVD, found that the silicon sphere surface of carbon nanotubes growing point, monodisperse nano graphite microspheres accident. Templates are four ways to build four new magnetic microspheres based on urea-formaldehyde resin and hydrothermal reduction the preparation of high magnetization of magnetic nanoparticles, these four kinds preparation methods are easy to implement, low-cost, environmentally friendly, easy to zoom production features. In this thesis, a study in this context has great theoretical significance and practical value.

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