Papers by Author: Xiao Long Zhao

Abstract: Electrospinning of PVA can be performed from aqueous solution leading to the generation of homogenous nanofiber webs. PVA nanofibers are generally required to be modified because of its poor stability in water. The water stability of PVA nanofibers was improved by heat treatment in this paper. The test results showed that the crystallinity of the PVA nanofibers increases after heat-treatment. The crystallinity which is the largest increased by 12% when they were treated at 150°C for 10 min. The heat-treated fibers don’t dissolve in water and show certain degree of agglutination and swelling. PVA nanofibers were taken as the inner layer of the sandwich structure purification material prepared with the hot pressing technology. The filtering experiment showed that the filtration properties were better when the area density of PVA nanofibers is 2.5g/m2. The filtration efficiency of materials and retention rate of PVA nanofibers decreased after being used for 5 times.

Abstract: Coaxial electrospinning has been recognized as an efficient technique for fabrication of composite fibers with especial circular cross-section in a diameter from micrometers to nanometers. In this paper, PS hollow submicro-fibers have been successfully prepared by electrospinning two polymer liquids through a coaxial, two spinneret, followed by selective removal of the core. Moreover, the influence of the relative (inner-to-outer) flow rate on the morphology and the average diameter of the fibers have been studied. The hollow submicro-fibers are particularly attractive for use in catalysis, purification, separation, gas storage, energy conversion, drug release, sensing, and environmental protection.

Abstract: Nano-TiO2 is a high efficient and no poisonous light induced catalyst. It is important how to immobilize it on some supporter for its application. In this paper, The Nylon-6 (PA-6) nanofibres bearing TiO2 nano-particles were prepared via gas-jet/electrospinning technique. The resulted materials were characterized by XRD, SEM, TEM, EDX and TG techniques, and antibacterial activities of the resulted fibers were tested by Shake Flask method. The results show that fibers bearing nano-TiO2, in an average diameter from 60 to 65nm were prepared, and the antibacterial efficiency of these gas-jet/electrospun nanofibers can reach 99.74%. The titled fibers can be loaded in a sandwich structure nanofiber super-cleaning material by hot-press process, and its filtration efficiency can reach 99.50% with 1µm polystyrene microspheres as the filter media.