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选择N?异丙基丙烯酰胺(N-isopropylacrylamide,NIPAM)为单体,N,N’?亚甲基双丙烯酰胺(Methylenebisacrylamide,MBA)为交联剂,用辐射化学方法合成了具有温敏的PNIPAM包覆Fe3O4磁导向纳米粒子。研究了NIPAM单体浓度、交联剂MBA用量、不同光照时间及温度对核壳结构磁性纳米粒子粒径的影响,发现在一定范围内随单体NIPAM浓度的增加、交联剂MBA浓度的减小、光照时间的增加,聚NIPAM包覆Fe3O4核壳结构纳米粒子的粒径增大。在25—39℃温度范围内PNIPAM包覆Fe3O4核壳结构纳米粒子具有最低临界溶解温度特性(Lowercriticalsolutiontemperature,LCST)。以SEM和动态激光光散射仪(PCS)对该核壳结构纳米粒子粒径进行测定,表明辐射化学方法合成的核壳结构纳米粒子比较均匀。
N-isopropylacrylamide (NIPAM) was chosen as the monomer and N, N’-methylenebisacrylamide (MBA) as the cross-linker. Radiation-sensitive PNIPAM coated Fe3O4 magnetically oriented nanoparticles. The effects of concentration of NIPAM monomer, MBA dosage of crosslinker, different light time and temperature on the particle size of core-shell magnetic nanoparticles were investigated. It was found that with the increase of monomer NIPAM concentration, Small, light time increases, polyNIPAM coated Fe3O4 core-shell nanoparticles with increased particle size. PNIPAM coated Fe3O4 core-shell nanoparticles have the lowest critical solution temperature (LCST) within the temperature range of 25-39 ℃. The particle size of the core-shell nanoparticles was measured by SEM and dynamic laser light scattering (PCS). The results showed that the core-shell nanoparticles synthesized by radiation chemistry were more uniform.