Antibacterial and photocatalytic activity of CuO nanostructure films with different morphology

Enhanced Mechanical Properties of Microalloyed Austenitic Stainless Steel Produced by Martensite Treatment

“…The more profound strength and ductility in sample annealed at 850°C for 1 min can be ascribed to the availability of thermal martensite and the presence of coarser grains, induced by AGG (secondary recrystallization) and probably primary recrystallization of retained austenite after cold rolling, respectively. It has been confirmed by Wang et al [31] that the micron-sized coarse grains have excellent dislocation storage capacity and significant work hardening ability. Accordingly, much higher ductilities may be achieved by incorporation of the micronsized grains into the UFG matrix.…”

Novel Candy-like Cu4O3 Microstructure: Facile Wet Chemical Synthesis, Formation Mechanism, and Good Long-Term Antibacterial Activities

“…The S. aureus is composed of multiple layers of peptidoglycan with numerous pores which are more susceptible of intracellular transduction caused by Cu 2+ ions released from the Cu 4 O 3 microstructure, resulting in cell wall disruption. In contrast, the cell wall of the E. coli is relatively thin and mainly consists of peptidoglycan and outer layers of lipopolysaccharide, lipoprotein, and phospholipids, which would be less prone to be attacked by the Cu 2+ ions. ,,, Thus, the antibacterial activity of the candy-like Cu 4 O 3 to S. aureus is higher than that of E. coli .…”

“…It was generally accepted that Cu 2+ could be the active species for copper oxide antibacterial materials, responsible for the antibacterial activity . This is because the Cu 2+ ions released from copper oxides may produce hazardous effects by generating the reactive oxygen species (ROS), for instance O 2 2–• , • OH, and HO 2 –• , which damage the cytomembrane and then disrupt amino acid synthesis and DNA. ,, The ROS could be generated from the surface defect sites in the Cu 4 O 3 microstructure or induced by the high concentrations of free Cu 2+ ions released from the Cu 4 O 3 microstructure. ,, Figure B,C confirms that the concentration of the bacteria is closely related with the concentration of Cu 2+ ions. With increasing quantity of the Cu 4 O 3 from 2 to 8 mg, the concentrations of Cu 2+ ions increase near linearly; meanwhile, the concentrations of S. aureus and E. coli decrease near linearly until the critical values, from which the concentrations of the bacteria drop sharply to very low values.…”

“…27,49,50 The ROS could be generated from the surface defect sites in the Cu 4 O 3 microstructure or induced by the high concentrations of free Cu 2+ ions released from the Cu 4 O 3 microstructure. 25,51,52 Based on the data in Figure 8A, the antibacterial rates of the two bacteria were calculated and are shown in Figure 8B. It presents that the antibacterial rates of the two bacteria increase rapidly with increasing the incubation time until 16 h. The antibacterial rates for the two bacteria exceed 90% within 9 h, and they reach 98.1% for S. aureus and 97.3% for E. coli at 16 h. From 16 to 48 h, the antibacterial rates increase slightly and the highest antibacterial rate, 99%, was attained at 48 h for the two bacteria.…”

Silver nanoparticle-immobilized porous POM/PLLA nanofibrous membranes: efficient catalysts for reduction of 4-nitroaniline

“…Noble metal nanoparticles (NPs) continue to receive immense scientic and technological interest in applications including, but not limited to, optoelectronics, 1,2 sensing, [3][4][5] biomedicine, 6-10 and catalysis. [11][12][13] In particular, silver (Ag) NPs (Ag NPs) have been proved to be promising candidates for use in catalysis. For catalytic applications, especially for liquid-phase treatments, it is necessary to immobilize Ag NPs onto a support material that can be easily separated from the liquid phase to make the metal NPs easily recyclable and reusable.…”