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首先通过乳化法得到磁性明胶微球,然后在高速搅拌条件下向乳液中直接加入正硅酸乙酯(TEOS),制备出多孔磁性明皎微球.用SEM,TEM观察了微球的微观形貌,发现微球呈疏松多孔状结构.用FT-IR,TGA,VSM等测试手段对微球的结构和性能进行表征.结果表明,二氧化硅掺杂于磁性明胶微球中.TEOS在反应中作为明胶微球的交联固化剂,推测其固化机理是物理交联固化.实验证实二氧化硅改性后,磁性明胶微球内部磁性颗粒氧化速度有所降低.所得到的多孔磁性明胶微球表现出铁磁性.
Firstly, magnetic gelatin microspheres were obtained by emulsification method, then TEOS was added to the emulsion under high speed agitation to prepare porous magnetic microspheres.Microscopic microspheres were observed by SEM and TEM The morphology and microstructure of the microspheres were characterized by their porous structure.The structures and properties of the microspheres were characterized by means of FT-IR, TGA and VSM.The results showed that silica was doped in the magnetic gelatin microspheres, As the cross-linking curing agent of gelatin microspheres, it is presumed that the curing mechanism is physical cross-linking curing. Experiments confirmed that the oxidation rate of the magnetic particles inside the magnetic gelatin microspheres decreased after the modification of silica. The obtained porous magnetic gelatin micro The ball shows ferromagnetism.