Simple and effective method to prepare microfiber reinforced nanofiber film with significant improvement of mechanical properties

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.