What is the exact shape of copper nanoparticles?4 answersCopper nanoparticles (Cu NPs) can exhibit various shapes such as cubes, hemispheres, agglomerates, spheres, nanorods, triangles, and nanodisks, depending on the synthesis method and conditions. The shape of Cu NPs is influenced by factors like the capping agent, copper precursor, and reaction conditions. For instance, the selective adsorption of specific ions on different crystallographic faces during growth can induce the formation of anisotropic shapes like nanorods or triangles. Additionally, the use of thiol additives can lead to a reorganization step in the synthesis process, affecting the final shape of the nanoparticles. These various shapes of Cu NPs have implications for their applications in fields such as biosensors, catalysis, optoelectronics, pollutant removal, antibacterial, antifungal, antioxidant, and anticancer agents.
What are the potential applications of using CuO nanoparticles with antibacterial and antifungal properties in healthcare and agriculture?5 answersCuO nanoparticles exhibit promising applications in healthcare and agriculture due to their antimicrobial properties. In healthcare, CuO nanoparticles have shown antibacterial efficacy against various strains, with Cu/CuO blends displaying notable activity against E. coli and B. cereus bacteria. Additionally, CuO nanoparticles have demonstrated antifungal activity, inhibiting the growth of pathogenic fungi like Alternaria sp.. In agriculture, Cu-based nanomaterials, including CuO nanoparticles, have been effective in managing plant diseases. Cu2O nanoparticles and copper nanowires displayed high antifungal activity against Alternaria alternata, showcasing their potential as alternatives to traditional fungicides. Furthermore, CuO-reinforced starch films have shown improved antimicrobial properties, inhibiting the growth of fungi like Alternaria alternata, making them promising candidates for commercial applications in packaging materials.
What are the effects of plant extract on the reduction of silver ions into silver nanoparticles?4 answersPlant extracts have been found to have a reducing effect on silver ions, leading to the formation of silver nanoparticles (AgNPs). Various plant extracts, such as those from Crescentia cujete L., Tanacetum vulgare L., Cucumis maderaspatanus L., Arum dioscoridis, and R. aculeatus, have been used for the synthesis of AgNPs. These extracts contain organic compounds such as terpenes, flavonoids, enzymes, proteins, and cofactors, which act as reducing agents for the synthesis of AgNPs. The reduction of silver ions into AgNPs has been confirmed through various characterization techniques such as UV–vis spectroscopy, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD). The resulting AgNPs have shown antimicrobial properties, inhibiting the growth of pathogenic microorganisms. Additionally, the plant-mediated AgNPs have demonstrated cytotoxic effects against cancer cell lines. Overall, plant extracts have proven to be effective in reducing silver ions and producing AgNPs with antimicrobial and anticancer properties.
How does the aggregation of Cu MOF affect its antibacterial properties?1 answersThe aggregation of Cu MOF has been found to significantly affect its antibacterial properties. Cu/H3BTC MOF exhibited notable antibacterial performance against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) by disrupting the cell membrane and causing the discharge of cell constituents. Cu(II)@ZIF-8 NPs, with a "four-leaf clover" structure, demonstrated excellent antibacterial performance against E. coli and S. aureus by specifically binding to bacterial cell walls and generating reactive oxygen species within bacteria. Cu-3, 5-dimethyl-1, 2, 4-triazole MOFs showed potential as antibacterial catalysts, inhibiting the growth of S. aureus, E. coli, and Acinetobacter baumannii. Cu-MOFs containing glutarates and bipyridyl ligands induced apoptosis-like death in Candida albicans cells and Aspergillus niger spores by elevating intracellular levels of reactive oxygen species. The aggregation-induced emission (AIE)-featured PEG-condensed Cu(I)-p-MBA aggregates exhibited enhanced photodynamic antibacterial activities against broad-spectrum bacteria.
What are the effects of Cu MOF aggregation on its antibacterial properties?1 answersCu metal-organic frameworks (MOFs) have been studied for their antibacterial properties. Different factors such as metal ions, metal salt states, and ligands can influence the sterilization ability of Cu-MOFs. Cu-MOFs synthesized with Cu(II) ions showed the largest inhibition-zone diameter against Staphylococcus aureus (S. aureus). Bimetallic Co/Cu-BTC MOFs exhibited stronger antibacterial activity compared to Cu-BTC MOFs, and the introduction of bimetallic central elements enhanced the redox properties and antibacterial effects of the materials. Cu/H3BTC MOFs disrupted the cell membrane of S. aureus and Escherichia coli (E. coli), leading to the discharge of cell constituents. Ag and Cu nanoparticles (NPs) showed bactericidal effects on methicillin-resistant S. aureus, and the antibacterial mechanisms involved the release of ions and reactive oxygen species, as well as damage to biomolecules. Cu(II)@ZIF-8 NPs exhibited excellent antibacterial performance against E. coli and S. aureus, with oxidase-like and peroxidase-like activities and specific binding to bacterial cell walls.
How to make copper antibacterial tape?5 answersCopper antibacterial tape can be made by mixing stainless steel powder, silver powder, and optionally copper powder with other beneficial metal powders, and melt spraying the mixture onto the surface of the metalwork. Another method involves applying an antibacterial agent layer made of antibacterial material onto a medical adhesive tape, which has a base layer made of cotton and an adhesive layer coated on the inner surface of the base layer.