Antibacterial powders of titanium dioxide/silver sulfate were produced by heat-treatment of the metatitanic acid, as precursor, into which the silver nitrate was added. The influences of heating temperature on the str...Antibacterial powders of titanium dioxide/silver sulfate were produced by heat-treatment of the metatitanic acid, as precursor, into which the silver nitrate was added. The influences of heating temperature on the structure and composition of the product were investigated through XRD and SEM. The results show that the powder is spherical in the phase of TiO2-Ag2SO4. The granularity of the particles increases from 10.7nm to 28.7nm with the temperature of heat-treatment increasing from 300℃ to 800℃. The antibacterial activity of the powder was judged in the way of the minimum inhibitory contents （MiCs）. When the content of silver sulfate is less than 2%, the photocatalysis of titanium dioxide and silver ions cooperate to kill bacteria. And the MiCs decrease and keep around 1.0×10 -41.5×10 -4 constantly with the increase of silver content. Furthermore, the MiCs decrease with the increase of temperature of heat-treatment when the temperature is lower than 500℃. But when the temperature is beyond 600℃ the MiCs increase quickly, which shows the inferior antibacterial performance.展开更多
以聚氧化乙烯(PEO)与钠基蒙脱土为主要原料,在室温时,于固体状态下充分混合30 m in,将混合好的PEO与钠基蒙脱土溶于50 mL蒸馏水中,加入一定量的VAE乳液和少量助剂,制得PEO/蒙脱土液态热熔胶。各组分的最佳质量比为水∶PEO∶VAE乳液∶钠...以聚氧化乙烯(PEO)与钠基蒙脱土为主要原料,在室温时,于固体状态下充分混合30 m in,将混合好的PEO与钠基蒙脱土溶于50 mL蒸馏水中,加入一定量的VAE乳液和少量助剂,制得PEO/蒙脱土液态热熔胶。各组分的最佳质量比为水∶PEO∶VAE乳液∶钠基土=50∶1∶0.3∶0.5,热熔胶溶液经涂布烘干后,制成胶膜,对牛皮纸的T型剥离强度达到0.14 kN/m。粘接的样品,在室温水中浸泡24 h,能自然分开,无残留胶体。展开更多
文摘Antibacterial powders of titanium dioxide/silver sulfate were produced by heat-treatment of the metatitanic acid, as precursor, into which the silver nitrate was added. The influences of heating temperature on the structure and composition of the product were investigated through XRD and SEM. The results show that the powder is spherical in the phase of TiO2-Ag2SO4. The granularity of the particles increases from 10.7nm to 28.7nm with the temperature of heat-treatment increasing from 300℃ to 800℃. The antibacterial activity of the powder was judged in the way of the minimum inhibitory contents （MiCs）. When the content of silver sulfate is less than 2%, the photocatalysis of titanium dioxide and silver ions cooperate to kill bacteria. And the MiCs decrease and keep around 1.0×10 -41.5×10 -4 constantly with the increase of silver content. Furthermore, the MiCs decrease with the increase of temperature of heat-treatment when the temperature is lower than 500℃. But when the temperature is beyond 600℃ the MiCs increase quickly, which shows the inferior antibacterial performance.
