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The nanometer TiO2 was prepared by pyrohydrolysis with titanic solution.The effects of species and content of the surfactants on the particle size,morphology and phase of TiO2 were studied by using LPA,XRD and TEM respectively.The results show that it is beneficial to reducing the aggregation of TiO2 particles with adding surfactants to the solution.Nanometer TiO2 powders with the size of 40-55 nm are obtained by adding the anion surfactants in the optimal content of 1.5%(mass fraction).The effect of cationic surfactant for reducing particle aggregation is not as good as that of anion.The crystal phase constitutent of TiO2 is dependent on the temperature of thermal treatment and complete anatase can be achieved after calcining in the temperature range of 350-750℃. 相似文献
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采用溶胶凝胶法将银掺人二氧化钛中,以载银二氧化钛为原料制备抗菌防晒护肤膏,研究载银二氧化钛对护肤膏的防晒性能、色泽稳定性以及抗菌性的影响,结果表明,w(银)为1%的二氧化钛应用于防晒护肤膏中具有较好的防晒性能、抗菌性和色泽稳定性。 相似文献
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采用微波热合法制备了掺杂LiFePO4锂电池用正极材料。通过XRD、SEM表征了材料的晶体结构和形貌,采用恒电流充放电法研究了材料的电化学性能。XRD结果表明,掺杂后的材料晶相为橄榄石型磷酸铁锂;SEM测试结果表明,加热时间延长促使材料颗粒团聚长大,且结晶完整,颗粒分布均匀。对电池的电化学测试表明,制备的掺杂LiFePO4材料表现出优良倍率性能和循环稳定性,充放电比容量分别为131.7 mAh/g和123.8 mAh/g,10次循环后比容量没有明显衰减。 相似文献
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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-Ag2 SO4. The granularity of the particles increases from 10.7 nm to 28.7 nm 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× 10-4- 1.5 × 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. 相似文献
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载银纳米二氧化钛抗菌粉体的制备工艺研究 总被引:6,自引:0,他引:6
以工业偏钛酸、工业浓硫酸为原料,采用稀释热水解法连续酸溶水解,并将银以磷酸难溶盐的形式载入,制备出载银纳米二氧化钛,优惠工艺条件:酸溶物料比H2TiO3/H2SO4=3(m/m),酸溶时间150~180 min,水解时间100~120 min,获得细小载银纳米前驱体。经喷雾干燥和450、500、550℃热处理后,XRD检测发现TiO2均为锐钛型,银未以银单质或银盐晶相出现在纳米粉体中。最终产品载银纳米二氧化钛粒径为20~80 nm,最小抑菌浓度达1.0×10-4 mg/kg,杀菌率为99.99%。 相似文献