OBJECTIVE:To evaluate the anti-bacterial activities of titanium dioxide(Ti O;)nanoparticles of Origanum(O.)vulgare and Hypericum(H.)perforatum extracts,carvacrol and hypericin against Staphylococcus(S.)aureus.METHODS:...OBJECTIVE:To evaluate the anti-bacterial activities of titanium dioxide(Ti O;)nanoparticles of Origanum(O.)vulgare and Hypericum(H.)perforatum extracts,carvacrol and hypericin against Staphylococcus(S.)aureus.METHODS:In this study,Ti O;nanoparticles of O.vulgare and H.perforatum extracts,carvacrol and hypericin,were prepared and their antibacterial effects were evaluated against Staphylococcus(S.)aureus.In this study,scanning electron microscope,fourier transform infrared spectrometer,atomic force microscopy,dynamic light scattering and zeta potential were used to investigate the structure of synthesized drugs.RESULTS:Anti-bacterial activity of synthesized NPs was tested by minimum inhibitory concentration(MIC),minimum bactericidal concentration and disc diffusion method.MICs of Ti O;-NPs synthesized using O.vulgare,H.perforatum,carvacrol and hypericin and Ti O;were obtained 250,62.5,250,and 250,and 500μg/m L,respectively.The MBCs for all of these were obtained 1000μg/m L.CONCLUSION:Green-synthesized of Ti O;nanoparticles provides a promising approach to the use of O.vulgare and H.perforatum,carvacrol and hypericin as novel agents and safer antibacterial compounds,especially anti-S.aureus compounds.展开更多
TiCl4/MgCl2/clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene （PP）/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerizati...TiCl4/MgCl2/clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene （PP）/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerization temperature, polymerization time, propylene pressure, solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied. Under optimal conditions, activity of the nano-compound catalyst is about 88.3 kg/（mol Ti-h）. Isotacticity of PP obtained in the nanocomposites is in the range of 89%-99%, and its melting temperature is about 159℃. The weight-average molecular weight of PP can reach 6.7 × 10^5 - 7.8 × 10^5, and the molecular weight distribution is between 7.7 and 7.9.展开更多
MoS 2-based composite coatings were deposited with the nano-compound unbalanced plasma plating technique. The effects of processing parameters and working environments on the tribological properties of the coatings w...MoS 2-based composite coatings were deposited with the nano-compound unbalanced plasma plating technique. The effects of processing parameters and working environments on the tribological properties of the coatings were examined by the drilling experiments and XPS. The distances between substrate and Ti target, Ti content and deposition pressure were varied in order to determine the optimum conditions for producing lubricious, long-lasting MoS 2-based coatings. It is found that the tribological performance of TiN-MoS 2 coating decreases rapidly in humid air but the humid-resistant property of TiN-MoS 2/Ti coating improves evidently.It is indicated that the humid-resistantance property and the abrasion durability of MoS 2-based coatings can be enhanced markedly by adding Ti with a certain contents.展开更多
基金financial support of the Research and Technology Deputy of Lorestan University of Medical Sciences,Khorramabad,Iran。
文摘OBJECTIVE:To evaluate the anti-bacterial activities of titanium dioxide(Ti O;)nanoparticles of Origanum(O.)vulgare and Hypericum(H.)perforatum extracts,carvacrol and hypericin against Staphylococcus(S.)aureus.METHODS:In this study,Ti O;nanoparticles of O.vulgare and H.perforatum extracts,carvacrol and hypericin,were prepared and their antibacterial effects were evaluated against Staphylococcus(S.)aureus.In this study,scanning electron microscope,fourier transform infrared spectrometer,atomic force microscopy,dynamic light scattering and zeta potential were used to investigate the structure of synthesized drugs.RESULTS:Anti-bacterial activity of synthesized NPs was tested by minimum inhibitory concentration(MIC),minimum bactericidal concentration and disc diffusion method.MICs of Ti O;-NPs synthesized using O.vulgare,H.perforatum,carvacrol and hypericin and Ti O;were obtained 250,62.5,250,and 250,and 500μg/m L,respectively.The MBCs for all of these were obtained 1000μg/m L.CONCLUSION:Green-synthesized of Ti O;nanoparticles provides a promising approach to the use of O.vulgare and H.perforatum,carvacrol and hypericin as novel agents and safer antibacterial compounds,especially anti-S.aureus compounds.
基金financially supported by the National Natural Science Foundation of China(Nos.20774098,50973123, 50503023)the Scientific Research Startup Foundation of Qingdao University of Science and Technology
文摘TiCl4/MgCl2/clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene （PP）/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerization temperature, polymerization time, propylene pressure, solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied. Under optimal conditions, activity of the nano-compound catalyst is about 88.3 kg/（mol Ti-h）. Isotacticity of PP obtained in the nanocomposites is in the range of 89%-99%, and its melting temperature is about 159℃. The weight-average molecular weight of PP can reach 6.7 × 10^5 - 7.8 × 10^5, and the molecular weight distribution is between 7.7 and 7.9.
基金FundedbytheNationalNaturalScienceFoundationofChi na (No .90 2 0 6 0 2 2 )
文摘MoS 2-based composite coatings were deposited with the nano-compound unbalanced plasma plating technique. The effects of processing parameters and working environments on the tribological properties of the coatings were examined by the drilling experiments and XPS. The distances between substrate and Ti target, Ti content and deposition pressure were varied in order to determine the optimum conditions for producing lubricious, long-lasting MoS 2-based coatings. It is found that the tribological performance of TiN-MoS 2 coating decreases rapidly in humid air but the humid-resistant property of TiN-MoS 2/Ti coating improves evidently.It is indicated that the humid-resistantance property and the abrasion durability of MoS 2-based coatings can be enhanced markedly by adding Ti with a certain contents.
