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通过溶剂热法合成Fe_3O_4磁性纳米粒子,利用Stber法制备了Fe_3O_4/SiO_2并将其表面功能化双键,随后以N-异丙基丙烯酰胺(NIPAM)、二乙烯基苯(DVB)和偶氮二异丁腈(AIBN)为原料,通过种子蒸馏沉淀聚合法引入一层温敏的多孔聚N-异丙基丙烯酰胺(PNIPAM),使用氢氟酸(HF)刻蚀掉中间的SiO_2层,即得到Fe_3O_4/PNIPAM纳米复合微球。采用透射电镜(TEM)、扫描电镜(SEM)、红外光谱(FT-IR)及振动样品磁强计(VSM)对复合微球进行表征。结果表明:所得微球具有超顺磁性,在水溶液中的磁场响应性良好。
Fe 3 O 4 magnetic nanoparticles were prepared by solvothermal method. Fe 3 O 4 / SiO 2 was synthesized by the Stöber method and the functionalized double bonds on the surface of Fe 3 O 4 / SiO 2 were synthesized. Then NIPAM, DVB and AIBN was used as raw material to introduce a layer of temperature-sensitive porous poly-N-isopropylacrylamide (PNIPAM) through seed-distillation precipitation polymerization. The middle SiO 2 Layer, to obtain Fe_3O_4 / PNIPAM nanocomposite microspheres. The microspheres were characterized by TEM, SEM, FT-IR and VSM. The results show that the obtained microspheres have superparamagnetism and have good magnetic field response in aqueous solution.