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This study describes the hydrothermal synthesis of cupric oxide nanoparticles (CuO NPs) using Mint extract agent. A mixture of 0.1 M copper nitrate and a mint extract was hydrothermally treated at a temperature of 180 °C for two hours. Meanwhile, the Mint leaf extract had reduced the copper ions of the nanoparticles after five minutes, resulting in dark-green precipitation. The structural and optical properties of the nanoparticles were studied using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), and UV-Vis spectroscopy. The nanoparticles showed a simple cubic structure with a crystallite size range of 22 nm ‒ 25 nm. According to the UV-Vis spectrum, an absorption peak was observed at 346 nm. The antibacterial activity was checked against Escherichia coli (E-coli) and Bacillus subtilis (B-subtilis) cultures by which the inhibition zones were found to be 35 mm and 38 mm, respectively. It is concluded that the CuO NPs have a good ability to resist microbes. [ABSTRACT FROM AUTHOR]

This study describes the hydrothermal synthesis of cupric oxide nanoparticles (CuO NPs) using Mint extract agent. A mixture of 0.1 M copper nitrate and a mint extract was hydrothermally treated at a temperature of 180 °C for two hours. Meanwhile, the Mint leaf extract had reduced the copper ions of the nanoparticles after five minutes, resulting in dark-green precipitation. The structural and optical properties of the nanoparticles were studied using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), and UV-Vis spectroscopy. The nanoparticles showed a simple cubic structure with a crystallite size range of 22 nm ‒ 25 nm. According to the UV-Vis spectrum, an absorption peak was observed at 346 nm. The antibacterial activity was checked against Escherichia coli (E-coli) and Bacillus subtilis (B-subtilis) cultures by which the inhibition zones were found to be 35 mm and 38 mm, respectively. It is concluded that the CuO NPs have a good ability to resist microbes. [ABSTRACT FROM AUTHOR]

A series of Pd/BiOCl catalysts have been prepared via a facile ethylene glycol (EG)-assisted solvothermal process in the presence of reactable ionic liquid 1-hexadecyl-3-methylimidazolium chloride ([C16mim]Cl). The as prepared products were characterised by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, transient photocurrent response analysis, UV-vis diffuse reflectance spectra and photoluminescence spectroscopy. During the reaction process, [C16mim]Cl acted not only as Cl source but also as solvent, template and dispersing agent for the fabrication of Pd/BiOCl flower-like microspheres structures. The existence of ionic liquid was beneficial to generate small scale and steady Pd nanoparticles. Moreover, the photocatalytic activities of the Pd/BiOCl composite samples were evaluated by the photocatalytic degradation of rhodamine B. The effects of structure and morphology made by the introduction of Pd have been studied. A possible mechanism of Pd on the enhancement of visible light performance was also proposed. [ABSTRACT FROM AUTHOR]

The composite microwave absorbing coatings reinforced with carbonyl iron nanoparticles were systematically studied. The morphologies of Fe–Si–Al powders (FSA), carbonyl iron nanoparticles (nmCIP) and the corresponding composite coating sections were characterised by scanning electron microscope (SEM) and transmission electron microscope (TEM). The electromagnetic performances of the microwave absorbents mentioned above were measured by vector network analyser and vibrating sample magnetometer, and the corresponding attenuation mechanisms ofthe absorbents were discussed. The composite coatings with polyurethane as matrix were fabricated by employing carbon black, FSA and nmCIP as absorbents. Moreover, the microwave absorption properties of these composite coatings with different absorbents were measured by the arch method. Results showed that nmCIP was an efficient magnetic loss absorbent with lowdensity. The microwave absorption properties of the coatings were significantly enhanced: the peak value of reflection loss (RL) reached -25.8 dB, and bandwidth (RL<-10 dB) was expanded to 3.6 GHz. While it was composited with FSA, which had the same loss mechanism with nmCIP, the location of effective absorption band could be modified with reduced areal density. [ABSTRACT FROM AUTHOR]