In this paper, graphene was obtained by Oxidation-reduction method. The obtained graphene was characterized by XRD and FTIR. On this basis, graphene/polyamide 6(PA6) composites were prepared by melt compounding. The well-dispersed graphene nanosheets in PA6 matrix was investigated by SEM. The properties were characterized by XRD, DSC and TGA. The results showed that the α-phase of polyamide 6 induced into γ-phase by adding graphene. The crystallization temperature and the crystallinity of composites have been increased in some degree. Besides, the composite has a higher thermal stability.
Nanofibers composed of the hydrophilic polymer polyvinylpyrrolidone K90 (PVP), cetyltrimethylammonium bromide (CTAB), tetraethyl orthosilicate (TEOS) and Fe3O4were fabricated using an electrospinning process. As a result of the templating and confinement properties of the nanfibers, silica coated magnetite (Fe3O4@SiO2) core-shell nanoparticles (NPs) with high magnetic sensitivity were spontaneously formed through molecular self-assembly when the fibers were added to 80% aqueous ethanol (PH=9.0). The typical saturation magnetization of the Fe3O4@SiO2composite particles is up to 43.8 emu/g, with superparamagnetic properties being observed at room temperature. Since the nanoparticles have high magnetic sensitivity and are preparedviaa facile and convenient strategy, they have much promise in a range of practical applications.
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