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中文摘要：
采用部分还原共沉淀法制备了尺寸约为10nm的Fe3O4磁性纳米粒子,并用油酸对其进行表面改性,通过无皂乳液聚合的方法将Fe3O4与温敏性N-异丙基丙烯酰胺-丙烯酰胺共聚物（PNIPAAm-co-Am）复合,获得了具有磁场和温度双重响应的复合微球.采用TEM,FTIR和XRD等方法研究了复合微球的结构与形貌,分别采用动态激光光散射（DLS）和振动样品磁强计（VSM）表征了复合微球的温度响应性和磁场响应性.结果表明,所制备的Fe3O4/（PNIPAAm-co-Am）复合微球具有核壳结构,尺寸约为100nm,该微球具有良好的磁响应性和温度响应性,其最低临界溶解温度（LCST）约为40℃.
英文摘要：
Oleic acid-coated Fe3O4 nanoparticles were synthesized by partial reduction coprecipitation method. Magnetic and temperature dual responsive composite microspheres,consisting of superparamagnetic Fe3O4 nanopaticles and thermoresponsive poly（ N-isopropylacrylamide-acrylamide） microgel,were prepared by emulsion-free copolymerization. TEM,FTIR and XRD measurements were performed to characterize the structure and morphology of the composite microspheres,vibrating sample magnetometry（ VSM） and the dynamic light scattering（ DLS） were carried out to characterize the magnetic properties and thermoresponsive properties of the microspheres,respectively. The results show that the resulting composite microspheres possessed a coreshell structure,and the average particle size was 100 nm. Furthermore,it was confirmed that the composite microspheres exhibited magnetic and temperature dual stimuli-responsive properties. The lower critical solution temperature（ LCST） of the composite microspheres is about 40 ℃ in water.
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