共查询到20条相似文献,搜索用时 15 毫秒
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The Density of Titanium(IV) Oxide Liquid 总被引:1,自引:0,他引:1
Donald B. Dingwell 《Journal of the American Ceramic Society》1991,74(10):2718-2719
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以叶腊石和钛白粉为主要原料,采用机械力化学法在叶腊石表面包覆钛白粉,制备一种无机复合型紫外吸收材料。用分光光度计分别在波长为330nm、350nm、370nm、390nm下测定复合材料的紫外光透过性能。结果表明:钛白粉包覆量、煅烧温度、煅烧时间、球磨机转速、球磨时间对叶腊石/TiO:复合粉体材料的紫外光透过率有重要影响,优化条件下制得的复合粉体材料紫外透光度明显低于叶腊石原粉,低于市售ZnO2且在各个波长的紫外透光度均低于5%。SEM表明:叶腊石表面包覆一层二氧化钛粒子。粒子成球状,粒径在200-450nm左右。 相似文献
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介孔 TiO2的合成及Ru/m-TiO2的催化活性研究 总被引:1,自引:0,他引:1
以氯化十六烷基吡啶(C16PyCl)为模板剂,在不同条件下合成了一系列介孔TiO2(m-TiO2),分别用红外光谱(FT-IR)、X射线粉末衍射(XRD)和BET比表面测定等技术对介孔TiO2的结构、晶相和比表面积进行了表征,探讨了模板剂、溶剂、溶液pH、老化温度和C16PyCl与TTIP摩尔比的影响.结果表明:在本实验条件下,最佳合成条件是C16PyCl为模板剂,溶剂为C2H5OH,pH为7~8,老化温度20℃,C16PyCl与TTIP摩尔比为2.负载活性组分Ru后,Ru颗粒与介孔载体发生相互作用,尽管可能会部分堵塞孔道,但对于甲醇分解为CO和H2的催化活性依然很高,载体的制备条件对甲醇分解活性有一定的影响. 相似文献
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Jingguo Li Lian Gao Jing Sun Qinghong Zhang Jingkun Guo Dongsheng Yan 《Journal of the American Ceramic Society》2001,84(12):3045-3047
Nanocrystalline TiN powder has been synthesized by the direct nitridation of nanocrystalline TiO2 powder. Powder XRD patterns indicated that the TiN nanocrystalline powder could be obtained by nitridation at 800°C for 5 h. TEM micrographs showed that the synthesized TiN powders consisted of uniform spherical particles with an average diameter of ∼20 nm. The effect of the nitridation temperature and holding time on the powder properties is discussed. 相似文献
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Kanichi Kamiya Tomoaki Nishijima Katsuhisa Tanaka 《Journal of the American Ceramic Society》1990,73(9):2750-2752
Dip-coated sol–gel-derived TiO2 films on an alumina substrate were converted to nonstoichiometric titanium nitride (TiN x ( x ≦ 1)) films by heating at approxmately 1000°C in NH3 gas. TiO2 films made from TiO2 sols prepared from Ti(O– i -C3 H7 )4 and stabilized by diethanolamine were more easily nitrided than those from sols containing HCl as a deflocculant reagent. This appears to be a result of the more porous structure of the former films. 相似文献
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采用Ti(SO4),和尿素为原料,利用均相沉淀.发泡工艺制备出了纳米氧化钛粉体材料,并用DTA-TG、XRD、IR和FS等方法对样品进行了表征。DTA-TG结果表明TiO2样品在高温固相反应期间有两个明显的失重台阶。XRD分析表明,在500℃下焙烧的TiO2样品为相纯度较高的锐钛矿型氧化钛粉体,其平均粒径约为12.834nm。IR谱图显示随着烧结温度的升高,450~800cm^-1处Ti-O键的伸缩振动峰出现分裂,且峰形逐渐锐化,表明纳米样品的尺寸有所增大。FS分析表明在365nm激发波长下,600℃煅烧下生成的混合晶型的纳米氧化钛具有最强受激发射峰,而在393nm激发光下。500℃煅烧下生成的锐钛矿型氧化钛具有最强受激发射峰。 相似文献
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钛阳极氧化膜由于其特殊的性能而得到广泛作用。在此通过测量钛阳极氧化膜在0.05mol/L氢氟酸溶液中的腐蚀电位随时间的变化以研究其耐蚀性。分析了膜层厚度、膜的形成温度及时间对其耐蚀性的影响。 相似文献
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Yunchen Du Sen Liu Yonglai Zhang Chengyang Yin Yan Di Feng-Shou Xiao 《Catalysis Letters》2006,108(3-4):155-158
A mesostructured sulfated tin oxide with large surface area (172 m2/g) has been successfully prepared using a block copolymer as structure-directing agent, which is extensively characterized
by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption, and Thermogravimetric analysis (TG)
techniques. The results indicate that the mesostructured sulfated tin oxide was tetragonal crystalline, and catalytic tests
show that the mesostructured sulfated tin oxide is much more active than conventional one for esterification and Friedel–Crafts
acylation. 相似文献
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TiO2纳米管阵列光催化降解苯酚 总被引:1,自引:0,他引:1
采用电化学阳极氧化法在钛基体上制得了高度致密的、有序的、均匀的TiO2纳米管阵列。用SEM、XRD等对其表面形貌和结构晶型进行了表征和分析。以TiO2纳米管阵列为光催化剂对废水中典型的有机污染物——苯酚进行了光催化降解,考察了影响光催化降解速率的因素。结果表明,在紫外光照下,苯酚水溶液的pH=3、ρ(苯酚)=10.0 mg/L时,具有锐钛矿相结构的TiO2纳米管阵列的光催化效果最好,相同条件下与溶胶凝胶法制备的纳米TiO2颗粒膜的光催化降解速率进行对比,前者比后者提高了近一倍。 相似文献