In this study, graphene oxide-sliver nanoparticle (GO-AgNP) composite was synthesized in situ with GO as the raw material. Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy, and scanning electron microscopy were used to characterize the composite, the spherical Ag particles with a diameter of about 36 nm were well deposited on the surface of GO nanosheets without serious agglomeration, and the antibacterial properties of the composites were also tested. Moreover, the silk fibroin (SF)/gelatin (GT) electrospun nanofiber film was prepared by electrospinning, and the structure of the SF nanofiber film was observed using a Fourier transform infrared spectrometer, X-ray diffractometer, and scanning electron microscope. The TGA curves indicated that the total weight loss rate of SF nanofibers at 400 C was significantly higher than that of SF/GT composite nanofibers (74.72% for pure SF, 62.37% for SF/GT nanocomposites). Finally, the GO-AgNP composite was combined with electrospinning SF film, which resulted in the decrease in surface roughness from 393.5 AE 123.7 nm to 109.9 AE 24.43 nm and the decrease in contact angle from 82.48 to 54.78 . Besides, the GO-AgNP composites enhanced the antibacterial performance of SF film greatly, which was conducive to its application in biological tissue engineering.

No abstract

No abstract

In this work, composite nanofiber membranes were prepared by adding modified nano-sized Al2O3-particles to a polyvinylidene fluoride (PVDF) solution (17 wt %) through an electrospinning process. The Al2O3 content affected the spun membrane performance, such as hydrophilicity, bovine serum albumin (BSA) rejection rate and anti-fouling properties were examined in detail. UF (experiment with an ultrafiltration cup) experiment was used to measure how the membrane water flux changed. This test showed that the nanoparticle affect was remarkable, the pure water flux was 4635 L•m−2•h−1 in 2% Al2O3/PVDF membrane versus 3546 L•m−2•h−1 for the membrane without nanoparticles. Contact angle was used to determine the hydrophilicity change of membranes. The results demonstrate that the modified membrane hydrophilicity was enhanced dramatically the contact angle of composite membrane with 2% Al2O3 was 56.34° versus 85.64° for the pristine PVDF membrane. The roughness and surface structure were measured by atomic force microscope (AFM) and electron microscopy (SEM). There were clear fibers in SEM images and the membrane surface roughness was heightened by adding nanoparticles. The rejection rate was investigated by UV spectrophotometer and the porosity was measured using a dry-wet weight method. The spun membrane rejection rate was 95.4%. Thermo gravimetric Analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) were used to study how nano-Al2O3 particles affected the membrane structure. More importantly, the Al2O3/PVDF spun membrane displayed an outstanding anti-fouling property. To sum up, this composite spun membrane shows a remarkable efficiency in the test and could be an ideal candidate for water treatment.

No abstract