Potato Virus A (PVA) ELISA Kit

This study addresses the intrinsic effect of hybrid fibres 3D network on the electrochemical characteristics of Ultra-High Performance Fibre Reinforced Composites (UHPFRC), including experimental investigations and mechanism analysis. Firstly, the matrix of the UHPFRC is fabricated based on the modified Andreasen & Andersen model. Then, three types of fibres (long steel fibre (LSF), short steel fibre (SSF) and polyvinyl alcohol fibre (PVA)) are further incorporated into the developed UHPFRC to generate different hybrid fibres 3D network. After that, the mechanical properties, chloride permeability and electrochemical properties of the designed UHPFRC with hybrid fibres are analyzed. The obtained results exhibit that with an increase of PVA content, the steel fibre network can be significantly disturbed, and the capacity of designed UHPFRC almost decrease linearly. In contrast, the added SSF cause that the capacity of UHPFRC with hybrid will decrease firstly and then increase. This implies that there is a balance point for the fibres hybridization design, with which the electrochemical corrosion resistance and mechanical properties of UHPFRC can be well optimized. At last, X-ray CT is further employed to quantitatively understand the fibres 3D network structure of the developed UHPFRC.

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.