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Modification of Magnetic Nanoparticles

Author: LiuXiaoFeng
Tutor: LiFeng
School: Beijing University of Chemical Technology
Course: Applied Chemistry
Keywords: Double hydroxides Hydrotalcite Coprecipitation Modification Ferrite
CLC: TB383
Type: Master's thesis
Year: 2005
Downloads: 401
Quote: 0
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Abstract


Magnetic nanoparticles as a new inorganic functional materials are mainly used in the biomedical field immobilized enzyme , targeting agents and cell separation , while the surface modification is the key to its successful application . Currently used magnetic nanoparticles Fe 3 O 4 , its surface modification method is mainly used surface coating polymers, the preparation process is more complicated. Layered double hydroxide composite metal oxide (LDHs) are a class of layered compounds , due to the bonding within the host layer patterns and lattice energy minimum effect and the effect of lattice positioning , laminate on metal ions can be uniformly distributed at the atomic level , i.e. on the laminate structure of each tiny unit, its chemical composition and the structure remains unchanged after the calcined LDHs uniform composition can be obtained spinel ferrite or spinel ferrite Some oxides and mixtures thereof. Based on the constituent elements of the hydrotalcite can be regulated with the advantages of using the laminar precursor is prepared LDHs modified modified ( by introducing a surface acid sites ) of the spinel-type ferrite new method to synthesize a series of M 2 -Fe 3 -Zr 4 -CO 3 2 - -LDHs, systematic study the product of preparation conditions on the crystal structure and thermal stability were investigated to study the LDHs calcined product of the surface magnetic properties and element valence states , and compared three different elements of the calcined product of the performance . Found that the Co, Mg, Ni and Zr and other metals into hydrotalcites can be formed having a uniform structure and composition of the functional activity of the precursor LDHs, a new type of calcined containing ZrO 2 -one type composite magnetic materials exhibit excellent magnetic properties ( saturation magnetization ) . Therefore, these new nano- magnetic particles can be applied not only in the biomedical field , but also in the field of catalysis also has potential applications .

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