Potato virus A (PVA) ELISA Kit

Microfiltration membrane with antifouling surface for efficient sterilization is of significance to improve the service performance of membrane system in water treatment engineering. Antibacterial property is beneficial for improving the anti-biofouling performance of membrane. Hence, in this work, citrate-capped Ag NPs were decorated on the surface of PVA-co-PE nanofibrous membrane through charge adsorption by the grafted TC-PEI (tricyanogen chloride-polyethyleneimine) on the nanofiber surface. As indicated by the result of morphology and chemical structure analysis, PVA-co-PE nanofibrous membrane with Ag NPs decorated surface has been successfully prepared. The composite membrane presents a stable water permeability with an absolute rejection efficiency of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) cells. In addition, after attached with the membrane, above bacteria were inactivated effectively with rate of 99.99%. Compared to control samples, the composite membrane presents excellent repetitive-use filtration performance after back-washing test indicating its superior anti-biofouling properties. This can be assigned to the negatively charged surface of citrate capped Ag NPs, which is beneficial for the penetration of BSA without obvious adhesion behavior to the surface of the membrane. The comprehensive microfiltration performance mentioned above has been attributed to the optimized surface of porous composite membranes synergistically determined by the network nanofiber scaffold and the stably functional surface of citrate-capped Ag NPs, which will bring a new approach in the treatment processing of water body full of microbes.

Polymeric composite films with tunable electrical and dielectric performance have several uses in electronics based on organic materials. This paper reports the fabrication and the role of TiO2 NPS (nanoparticles) on the dielectric and nanocomposites' conduction of pristine polyvinyl alcohol (PVA). The nanopowder of biphase TiO2 and the nanocomposites of different NPS weight percentages have been fabricated via the sol-gel and casting methods. Structure of the synthesized NPS and nanocomposites were analyzed via PXRD (Powder X-ray diffraction), HR-TEM (High-resolution microscopy of transmission electron), and FTIR (Fourier transform-IR). The average size of the biphase TiO2NPS crystallite is around 52 nm, as calculated from Scherer law. Frequency and temperature dependence of dielectric properties have been studied in a wide range. The dielectric constant of the host matrix has been enhanced by adding TiO2NPS. AC conductivity increases with the further addition of TiO2NPS contents, and its frequency dependence follows the universal power law. The nano composite with 6.6 wt% of TiO2NPS shows higher conductivity as compared to other concentrations. The exponent power (s) has values in the range of 0.2-0.9, indicating that the conduction mechanism is correlated with barrier hopping (CBH). The dependence of the DC conductivity on absolute temperature has been studied and obeys Arrhenius relation. Three discrete sections were recognized from the AC conductivity spectra. In light of polaronic hopping conduction models, the electrical conductivity data were analyzed. The analysis shows that the high-temperature conductivity is well explained by the polaronic model, while at an intermediate temperature, the Greaves VRH (variable-range hopping) model is appropriate. Also, the non-adiabatic conduction was established in the nanocomposite system via the application of different suggestions. The values of the decay constant and the density of states confirmed the presence of the localized states. Finally, a small polamn coupling constant (gamma(p)) is more significant than four, which indicates a strong electron-phonon interaction.