Abstract: Using electrospinning technology, N,Ndimethylformamide as solvent and polyacrylonitrile (PAN) as carrier, we prepared PAN/CNC/Ag composite nanofibers. The chemical structure, morphology, thermal stability and crystal structure of composite nanofibers were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electromicroscopy (TEM), scanning electron microscope (SEM), thermal gravity differential thermal gravity analysis (TG\|DTG) and X-ray diffraction (XRD). The results show that PNC,CNC and Ag nanoparticles combined form PNC/CNC/Ag composite nanofibers. The composite nanofibers are uniform in size with average diameter of (214±12)nm, and the Ag nanoparticles are uniformly distrib
uted in the composite nanofibers with particle size of 5—25 nm. The composite nanofibers have excellent antimicrobial properties against grampositive Staphylococcus aureus (S.aureus) and gramnegative Escherichia coli (E.coli).

Key words: cellulose nanocrystal, polyacrylonitrile, Ag nanoparticle, electrospinning