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
Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characteri...Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characterization of modified pore walls of template by solvents with different polarities. And the relationship between PVP nano-tube formation and modification of pore walls of template was discussed preliminary.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）.
基金supported by the National Natural Science Foundation of China(11274173,51032002,61222403,11374159)FundamentalResearch Funds for the Central Universities,China(NZ2013304)~~
文摘Arrayed clusters of poly(vinyl pyrrolidone) (PVP) nano-tube were prepared by using porous alumina membrane treated with hydrophobic materials as the template. Fluorescence spectrum method was applied to the characterization of modified pore walls of template by solvents with different polarities. And the relationship between PVP nano-tube formation and modification of pore walls of template was discussed preliminary.
