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A new caffeic acid derivative (( E)-3-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)acrylic acid, HL)) is synthesized from caffeic acid, followed by the preparation of a Cu(II) complex, [Cu(L)DMSO]·2DMSO. The structure is determined by single crystal X-ray diffraction, and the urease inhibitory activity of the complex is studied. The results show that IC of the complex is 0.56 μmol/L, which is superior to positive control acetohydroxamic acid (AHA, IC was 10.95 μmol/l), i.e., the complex has strong inhibitory activity towards urease. [ABSTRACT FROM AUTHOR]

The controllable formation of zinc oxide ( ZnO) nanostructures and nanowires by a cheap and environmental friendly fabrication method of simply subjecting metallic zinc films in sodium chloride ( NaCl) solution at 170°C from 3 to 15 h under hydrothermal conditions is demonstrated in this study. Scanning electron microscopy ( SEM) and X-ray diffraction ( XRD) indicate that ZnO films with different morphologies are obtained: from a film with network of circular pores to a film with nanowire-like network with bigger pores. It is observed that heating duration has an effect on its photoluminescence ( PL) properties. Ultraviolet emission is observed for all ZnO films. Green emission surfaces after heating for 6 h, which subsequently disappears after 15 h of heating. It is suggested that the morphology change over different heating durations is responsible for the rise and subsequent decline in green emissions. Lastly, the growth mechanism behind zinc oxidation and morphology change is proposed and investigated with the aid of experimental method. It is verified that pitting corrosion is responsible for the growth mechanism here. [ABSTRACT FROM AUTHOR]

The effect of mechanical alloying on Zn-Sb alloy system is investigated with X-ray diffraction (XRD), laser grain size analysis and differential scanning calorimetry (DSC) respectively. The results of laser particle size analysis shows that the particle size decreases with increasing of the grinding time between 0 and 24 h. XRD and DSC results indicate that longer the grinding time of Zn-Sb is, the more content of Zn4Sb3 become in the product in this process. [ABSTRACT FROM AUTHOR]