At the end of January 2018,the China Gold Association announced the gold production of China’s main gold enterprises in 2017.Shandong Gold Group(SD-Gold)ranked first with 43.93 tons of gold production,up by 18.47% ye...At the end of January 2018,the China Gold Association announced the gold production of China’s main gold enterprises in 2017.Shandong Gold Group(SD-Gold)ranked first with 43.93 tons of gold production,up by 18.47% year-on-year.SD-Gold’s gold production exceeded that of China National Gold Group Corporation for the first time,and was far ahead that of Zijin Mining Group and Zhaojin Group.展开更多
This work is devoted to the synthesis and stabilization of nanosized Ag/SiO2 and Au/SiO2 disperse materials and investigation their morphology, optical and antimicrobial properties. First, Ag and Au nanoparticles (NPs...This work is devoted to the synthesis and stabilization of nanosized Ag/SiO2 and Au/SiO2 disperse materials and investigation their morphology, optical and antimicrobial properties. First, Ag and Au nanoparticles (NPs) were produced in colloids via chemical (Ag) or photochemical (Au) reduction of appropriate ions. To prevent the oxidation of Ag NPs in colloid solution, external binary stabilizing agents PVP and SDS were used. Then, Ag and Au NPs (0.01-0.05% wt) were adsorbed from their colloid solutions on high disperse silica surface (Ssp=260m2/g) and samples prepared were dried. Materials obtained were studied by UV-vis, XRD, and TEM methods. Ag and Au NPs adsorbed on silica demonstrated a fair crystallinity in XRD. The surface plasmon resonance (SPR) band positions inherent to Ag and Au NPs on silica surface as well as the intensities of optical spectra were stable during 7 month and more. Obtained Ag NPs in colloids and Ag/SiO2 composites demonstrated excellent antimicrobial activity against a series of the microorganisms (Escherichia coli, Staphylococcus aurous, and Candida albicans). Au/SiO2 samples did not reveal any bactericide properties relative to the test microorganisms grown. The mechanisms of Ag(Au) NPs interaction with silica surface were analyzed.展开更多
文摘At the end of January 2018,the China Gold Association announced the gold production of China’s main gold enterprises in 2017.Shandong Gold Group(SD-Gold)ranked first with 43.93 tons of gold production,up by 18.47% year-on-year.SD-Gold’s gold production exceeded that of China National Gold Group Corporation for the first time,and was far ahead that of Zijin Mining Group and Zhaojin Group.
基金This study was supported by the China Scholarship Council(GrantNo.160),National Nature Science Foundation of China (GrantNo.400722006)and the Key Task Project of Science and Technology of Liaoning Province (GrantNo.2001230001)
文摘This work is devoted to the synthesis and stabilization of nanosized Ag/SiO2 and Au/SiO2 disperse materials and investigation their morphology, optical and antimicrobial properties. First, Ag and Au nanoparticles (NPs) were produced in colloids via chemical (Ag) or photochemical (Au) reduction of appropriate ions. To prevent the oxidation of Ag NPs in colloid solution, external binary stabilizing agents PVP and SDS were used. Then, Ag and Au NPs (0.01-0.05% wt) were adsorbed from their colloid solutions on high disperse silica surface (Ssp=260m2/g) and samples prepared were dried. Materials obtained were studied by UV-vis, XRD, and TEM methods. Ag and Au NPs adsorbed on silica demonstrated a fair crystallinity in XRD. The surface plasmon resonance (SPR) band positions inherent to Ag and Au NPs on silica surface as well as the intensities of optical spectra were stable during 7 month and more. Obtained Ag NPs in colloids and Ag/SiO2 composites demonstrated excellent antimicrobial activity against a series of the microorganisms (Escherichia coli, Staphylococcus aurous, and Candida albicans). Au/SiO2 samples did not reveal any bactericide properties relative to the test microorganisms grown. The mechanisms of Ag(Au) NPs interaction with silica surface were analyzed.
