Poly（vinyl pyrrolidone）（PVP）/Fe 3O 4 composite nanofibers were successfully prepared by using electrospinning technique.The composite nanofibers were characterized by means of TEM（transmission electron microscopy...Poly（vinyl pyrrolidone）（PVP）/Fe 3O 4 composite nanofibers were successfully prepared by using electrospinning technique.The composite nanofibers were characterized by means of TEM（transmission electron microscopy）,XRD（X-ray diffraction）and TGA（thermogravimetric analysis）.Transmission electron microscope images of the PVP/Fe3O4 nanofibers show that the Fe3O4 nanoparticles with a diameter about 10.5 nm were dispersed in PVP fiber matrices.The XRD results show that the particles in PVP fibers were indeed Fe3O4 nanoparticles.And the TGA of PVP/Fe3O4 nanofibers show that the content of Fe3O4 nanoparticles in the composite was about 36.8%（mass fraction）.The PVP/Fe3O4 nanofibers were found to be superparamagnetic.The hysteresis loop at room temperature showed a high saturated magnetization（M s=15.1 emu/g）and a low coercive force（μ c=0）.展开更多
总结了近年来聚酰胺-胺(PAMAM)修饰磁性纳米四氧化三铁粒子(magnetic iron oxide nanoparticles,IONP)的研究成果。对合成工艺进行了比较和分析,同时对复合纳米材料在药物载体、核磁成像、酶工程、转基因载体和生物芯片等领域的应用进...总结了近年来聚酰胺-胺(PAMAM)修饰磁性纳米四氧化三铁粒子(magnetic iron oxide nanoparticles,IONP)的研究成果。对合成工艺进行了比较和分析,同时对复合纳米材料在药物载体、核磁成像、酶工程、转基因载体和生物芯片等领域的应用进行了总结和展望。展开更多
采用共沉淀法制得粒径为10~20 nm的超顺磁性四氧化三铁纳米粒子（superparamagnetic iron oxide nanoparticles,IONP）,以树枝状高分子聚酰胺-胺（PAMAM）对SIONP包覆修饰得到核壳结构的复合粒子（PAMAMIONP）。通过马尔文粒度仪、扫描...采用共沉淀法制得粒径为10~20 nm的超顺磁性四氧化三铁纳米粒子（superparamagnetic iron oxide nanoparticles,IONP）,以树枝状高分子聚酰胺-胺（PAMAM）对SIONP包覆修饰得到核壳结构的复合粒子（PAMAMIONP）。通过马尔文粒度仪、扫描电镜、能谱仪、红外光谱仪对材料形貌和结构进行表征,并将含不同类型和浓度的纳米粒子培养液与Hep G2细胞共培养、MTT法来评价粒子细胞毒性。研究结果表明,IONP外部包覆PAMAM之后,粒子在水溶液中的分散性明显增强、毒性显著降低,且氨基封端的复合粒子（PAMAM-IONP）细胞毒性小于酯键封端的复合粒子（MA-PAMAM-IONP）。展开更多
文摘Poly（vinyl pyrrolidone）（PVP）/Fe 3O 4 composite nanofibers were successfully prepared by using electrospinning technique.The composite nanofibers were characterized by means of TEM（transmission electron microscopy）,XRD（X-ray diffraction）and TGA（thermogravimetric analysis）.Transmission electron microscope images of the PVP/Fe3O4 nanofibers show that the Fe3O4 nanoparticles with a diameter about 10.5 nm were dispersed in PVP fiber matrices.The XRD results show that the particles in PVP fibers were indeed Fe3O4 nanoparticles.And the TGA of PVP/Fe3O4 nanofibers show that the content of Fe3O4 nanoparticles in the composite was about 36.8%（mass fraction）.The PVP/Fe3O4 nanofibers were found to be superparamagnetic.The hysteresis loop at room temperature showed a high saturated magnetization（M s=15.1 emu/g）and a low coercive force（μ c=0）.
