Fluorescent polystyrene（PS）/porphyrin（TPPA） composite nanospheres were successfully fabricated by electrospinning. The SEM images clearly show that owing to adding TPPA in PS, the averaged diameter of the composite nanospheres became smaller, from 1500 to 580 nm. Fourier-transform infrared（FTIR） spectra determined the chemical composition of the resulting PS/TPPA composite nanospheres. The photoluminescent（PL） spectral analysis indicates that the peak position of the composite nanospheres in either solid state or water is identical to that of pure TPPA, at about 652 nm, and is still unchangeable when they are left for at least 20 d, indicating the stable photoluminescent property of the fluorescent composite nanospheres.
SONG YanZHAN Nai-qianYU MiaoYANG Qing-biaoZHANG Chao-qunLI Yao-xian
Microfiber reinforced nanofiber films were prepared with the help of two nozzles technology.We designed a new device via placing two nozzles on the opposite sides of a rolling cylinder,with a piece of thin insulation board with a certain size of hole in the middle part installed to accommodate the cylinder so as to form two entirely independent electric fields.Playing the role of support,microfiber may be favorable for enhancing the mechanic performance of the nanofiber.Compared with that of single nanofiber,the tensile strength of the composite micro/nanofiber prepared by this method has been increased by a factor of 4.5.After the further improvement of the fiber orientation,the tensile strength is 7.96 times that of non-oriented composite micro/nanofibers film,30 times that of the single nanofiber film.
