properties of Polymer / Fe_3O_4 nanocomposites Preparation

Title: properties of Polymer / Fe_3O_4 nanocomposites Preparation   Author: Lu Wensheng Degree-granting units: Anhui University Keywords: iron oxide;; magnetic nanoparticles;; magnetic nanocomposites;; dual functional materials;; Magnetic Polymer Composite Microspheres Abstract: Magnetic nano-materials and composites is a new nano-materials research today is an important area. This paper first use of biological molecules of glucose as the reducing agent, prepared by the green chemical synthesis has been super-paramagnetic iron oxide (Fe3O4) nanoparticles; also used in situ reduction, blending embedding method, suspension polymerization, etc. methods were prepared to get a dual function Fe3O4/Se one-dimensional plate-beam, Fe3O4/Se/PANI composite materials, and dialdehyde starch coated polystyrene - acrylic coated Fe3O4 Rare earth magnets magnetic polymer microspheres. And product composition, structure and properties were studied. Specific studies are as follows: 1. The use of glucose as the reductant, gluconic acid (glucose oxidation products) as stabilizer and dispersing agent, by the system got the green chemical synthesis of superparamagnetic Fe3O4 nanoparticles. The results show that the obtained anti-Fe3O4 nanoparticles for the spinel structure, the average particle size of about 12.5 nm, narrow size distribution, dispersion, and room temperature magnetic saturation strength of 60.5 emu / g, coercive force and residual magnetic zero. This preparation method is very simple, mild reaction conditions, may be green synthesis of other nanomaterials provides a simple and appropriate way. (2) the use of Fe3O4 nanoparticles can absorb SeO32 (Se (Ⅳ)) ions, without any cross-linking agent and dispersing agent, by in situ reduction method was homogeneous novel kind of straw bales has dual fluorescent and superparamagnetic properties Fe3O4/Se one-dimensional plate beam. The results show that, Fe3O4/Se one-dimensional board length, width and thickness are 6-8μm ,300-400 nm and 50 nm; Fe3O4 nanoparticles in the preparation of bifunctional nanocomposites process may act as a "seed" and a catalyst dual role; Fe3O4/Se nanocomposites in t-Se because of their quantum size effects and electronic band gap direct transition apparent blue shift; Fe3O4/Se one-dimensional plate beam formation mechanism may involve Fe3O4/Se nanosphere formation, growth and aggregation, as well as one-dimensional plate formation and self-assembly. We obtained the straw bales like Fe3O4/Se nanocomposite templates may also be prepared to sacrifice other special morphology of the dual function of nanomaterials. For example: Fe3O4/Ag2Se, Fe3O4/Bi2Se3 and Fe3O4/CdSe and so on. This dual-function materials in microelectronics and biomedical fields have potential applications. And under hydrothermal conditions using SeO32-oxidation of aniline by in situ synthesis method were both surface magnetic and conductive properties of nano-Fe3O4/Se/PANI composites. 3 Since starch can be in the ferric chloride hydrolysis in acidic solution of reducing sugar (glucose), on the basis of earlier studies, we supposed starch and ferric chloride as raw materials, also have been successfully prepared superparamagnetic Fe3O4 nanoparticles, and by http://www.chinamagnets.biz/ blending embedding, with epichlorohydrin as crosslinker, the dialdehyde starch coated on the Fe3O4 magnetic nanoparticles prepared by a magnetic composite nanoparticles dialdehyde starch, and bovine serum albumin as a model protein for a fixed capacity of composite nanoparticles were studied. Magnetic composite nanoparticles dialdehyde starch size distribution in 50 nm-150 nm, with an average particle size of about 100 nm, aldehyde content of about 59.5%, dialdehyde starch parcel is approximately 33.2%, saturation magnetization at room temperature strength of 29.5 emu / g, no remanence and coercivity, the rate of protein loading and entrapment efficiency were 5.0% and 54.4%. It also shows that we prepared products in targeted drug delivery and drug delivery and other aspects of potential applications. 4 with styrene as the hard monomer, acrylic acid as functional monomer, the use of dispersion polymerization, oleic acid-modified magnetic Fe3O4 nanoparticles for the nuclear, styrene - acrylic acid copolymer polymer shell, has been prepared monodisperse, polystyrene containing carboxylic Fe3O4 - acrylic acid [P (St-AA)] Zi-polymer composite microspheres, and magnetic properties of curcumin analog drugs on the ability of drug-loaded composite microspheres were studied. The results show that we obtained magnetic polymer composite microspheres are spherical morphology, particle size distribution in 50 nm-120 nm, with an average particle size of about 100 nm; magnetic polymer composite microspheres of polystyrene - propylene acid content and the content of Fe3O4 magnetic nanoparticles were about 74% and 24.7%; of curcumin loading rate and encapsulation efficiency were 2.5% and 44.4%; magnetic polymer composite microspheres at room temperature saturation magnetization of 20.2emu / g, no remanence and coercivity. Degree Year: 2010