Study On The Preparation And Modification Of Cuprous Oxide And Its Anti-bacterial Froperities

Bacteria and other microorganisms have seriously threatened the health of human being.With the development of textile materials toward being comfortable, textile materials can satisfythe regular daily demand, which have attracted substantial interest and investigation. Inorganicantibacterial agents have overcome the shortcomings of natural and organic antimicrobial agentsin terms of heat resistant, safety, duratility and too short effective reaction time. Varieties ofpreparing methods have also attracted much interest. Cuprous oxide nanoparticles have excellentphysical and chemical properties to make it have potential applications owing to its surfaceeffect, small size effect and quantum tunneling effects. Cuprous oxide can be adulterated to othermaterials to make antibacterial materials.(1) Uniform cuprous oxide have been successfully prepared by chemical precipitation withcopper sulfate as copper source and glucose as reducing agent. The influence of differentsurfactants and temperature were discussed. X-ray diffraction (XRD), scanning electronmicroscopy (SEM) and Fourier transformation infrared spectrophotometry(FT-IR) wereemployed to characterize the structure and morphology of cuprous oxide. XRD indicated that thediameter of cuprous oxide was about800nm. From the FT-IR, the absorption peak of stretchingvibration of Cu-O(Ⅰ) bond appeared at628cm-1. SEM showed that the size and morphologywere uniform. In addition, the antibacterial activity of cuprous oxide with different morphologiestowards Gram-positive Staphylococcus aureus (S.aureus) and Gram-negative Escherichia coli(E.coli) were also investigated. Results suggested that cuprous oxide had better antibacterialeffects and Cu2O with octahedral had higher selectivity. The effects of different buffers werediscussed. when the buffer was water, antimicrobial resistance was better.(2) Taking cost and performance into account, other particles were doped to modifycuprous oxide. The right amount of titanium dioxide can improve the performance of the originalwire. Silica can make fiber have better tensile properties and spinnability. Cu2O/TiO2, Cu2O/SiO2,Cu2O/ZnO and Cu2O/TiO2/SiO2/ZnO were prepared and their antibacterial properties werecompared. In result, Cu2O/TiO2had the best antibacterial property.(3) The surface of the Cu2O was modified by SiO2to avoid the direct contact betweenCu2O and fibers in the extrusion process. Silica with more hydroxyl groups was used to modifyCu2O. Cu2O@SiO2and Cu2O/TiO2@SiO2were synthesized by means of XPS, SEM, FTIR to characterize. From the FT-IR, the absorption peak of stretching vibration of Si-O bond appeared.XPS showed Cu, O, Ti and Si. SEM displayed that there was a thin layer of materials outside ofthe cuprous oxide and the particle size had increased. The experimental result showed that theantibacterial activity of Cu2O decreased due to the surface-coating of SiO2.(4) Cu2O@PMMA were prepared. From the FT-IR, the absorption peak of Cu2O@PMMAappeared. TGA displayed the amount of PMMA was about5%. The experimental result showedthat the antibacterial activity of Cu2O decreased due to the surface-coating of PMMA.