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以廉价的工业级偏钛酸为原料,采用水热法制备了锐钛矿型介孔TiO2,考察了水热温度和水热时间对TiO2晶粒度的影响,并对TiO2进行了N2吸附-脱附、SEM及TG-DTA表征,结果表明,水热温度对TiO2晶粒度的影响较大而水热时间影响较小,纳米尺寸的TiO2晶体在聚乙二醇模板剂的作用下组装为微米级的介孔TiO2,平均介孔... 相似文献
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以三嵌段共聚物F127为模板剂,采用溶胶--凝胶法在AZ31镁合金表面制备了介孔45S5生物玻璃陶瓷涂层。通过扫描电子显微镜和比表面积测试等方法表征了涂层的表面形貌和介孔结构,探讨了F127在介孔结构形成中的作用机理以及介孔对涂层性能的影响,并通过浸泡实验研究了镁合金及其涂层在模拟体液(SBF)中的降解行为。结果表明:制得的涂层表面均匀、无裂纹,与基体形成良好的界面结合。在模拟体液中,该涂层能够显著地降低镁合金基体的腐蚀速率和诱导羟基磷灰石的沉积,有效地改善镁合金的耐蚀性和生物活性。 相似文献
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采用溶胶-凝胶法制备了化学组成为CaZr4P6O24(CZP)的溶胶态前驱物,用其涂覆薄壁蜂窝堇青石陶瓷,经过700℃焙烧2h转化为具有低热膨胀特性的结晶态CZP涂层。用X射线衍射和BET(Brunauer-Emmett-Teller)氮吸附法表征了涂层的物相和孔结构,用扫描电镜观察了涂层表面及涂层与基体的界面结合处的形貌,用能量色散光谱仪分析了涂层中的元素分布及含量。结果表明:在蜂窝堇青石陶瓷基体上形成的涂层组成为CZP;表面沉积了19.5%(质量分数)CZP的蜂窝堇青石陶瓷的BET比表面积、孔体积和平均孔径分别为16.4m2/g,0.0225mL/g和2.74nm。CZP涂层与蜂窝堇青石基体的界面结合良好。发动机台架性能试验结果表明:"CZP-蜂窝堇青石"复合载体负载的单钯催化剂表现出与"γ-Al2O3-蜂窝堇青石"负载的单钯催化剂相近的三效转化活性。 相似文献
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H.‐S. Zhao W. He Y.‐J. Feng X.‐T. Jia X.‐D. Zhang Z.‐M. Li S.‐P. Yan W.‐J. Zhou 《化学工程与技术》2007,30(8):1010-1013
Mesoporous titanium dioxide (TiO2) with a pore size range from 5–7 nm was synthesized by a sol‐gel method using biosurfactant phosphatidylcholines as an organic template. Titanium tetrabutoxide (TBOT) was used as the precursor. A very fine mesoporous structure formed in the particle was maintained after a heat treatment at 700 °C. Low‐angle X‐ray powder diffraction (XRD) and a pore size distribution curve revealed the existence of the mesoporous structure. Transmission Electron Microscopy (TEM) and N2 adsorption–desorption isotherms were utilized for further characterization. A significant red shift in the UV‐VIS spectrum of the porous material was observed, which could be explained by the energy band theory. The results confirmed the synthesis of mesoporous TiO2. 相似文献
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Recent research trends of the preparation and characterization of highly efficient titanium oxide-based photocatalysts modified
by different methods are reviewed on the basis of studies done in our laboratory. Special attention is focused on the preparation
and characterization of TiO2 photocatalysts prepared by the transitional metal doping and noble metal deposition method, especially combining above two
methods. Fe3+ doped together with Au deposited TiO2 (Au/Fe3+–TiO2) was successfully prepared, which shows excellent photocatalytic activity for degradation of methyl orange (MO) under both
UV and visible light (λ > 420 nm) illumination. Fe3+ has been confirmed by EPR to substitute for Ti4+ in the TiO2 lattice, and Au exists as Au0 on the surface of the photocatalyst indicated by the results of XRD. Fe3+ and Au have synergistic effects on improving the photocatalytic activity of TiO2. A proposed mechanism concerning the synergistic effects is discussed to explain the improvement of the photocatalytic activities. 相似文献
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Weiwei Lou Yiwen Dong Hualin Zhang Yifan Jin Xiaohui Hu Jianfeng Ma Jinsong Liu Gang Wu 《International journal of molecular sciences》2015,16(9):21070-21086
Titanium (Ti) has been widely used in clinical applications for its excellent biocompatibility and mechanical properties. However, the bioinertness of the surface of Ti has motivated researchers to improve the physicochemical and biological properties of the implants through various surface modifications, such as coatings. For this purpose, we prepared a novel bioactive material, a lanthanum-incorporated hydroxyapatite (La-HA) coating, using a dip-coating technique with a La-HA sol along with post-heat treatment. The XRD, FTIR and EDX results presented in this paper confirmed that lanthanum was successfully incorporated into the structure of HA. The La-HA coating was composed of rod-like particles which densely compacted together without microcracks. The results of the interfacial shear strength test indicated that the incorporation of lanthanum increased the bonding strength of the HA coating. The mass loss ratios under acidic conditions (pH = 5.5) suggested that the La-HA coatings have better acid resistance. The cytocompatibility of the La-HA coating was also revealed by the relative activity of alkaline phosphatase, cellular morphology and cell proliferation assay in vitro. The present study suggested that La-HA coated on Ti has promising potential for applications in the development of a new type of bioactive coating for metal implants. 相似文献
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室温水解法制备介孔二氧化钛的表征及应用 总被引:8,自引:0,他引:8
以氯化十六烷基吡啶为模板剂,在室温下直接合成出介孔TiO2,探讨了合成条件的影响,分别用红外光谱(FT-IR)、热分析(TG-DTA),X射线粉末衍射(XRD)和N2吸附等温线技术对产物进行了表征.结果表明:样品经均三甲苯和磷酸处理后能有效提高比表面积和热稳定性,具有较高的光催化活性. 相似文献
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利用超声分散法,以聚乙二醇为造孔剂制备多孔TiO2粉体,并对其进行表征测试。研究其对罗丹明B的光催化降解过程。结果表明:产品在450℃焙烧2 h,投加量为2 g/L时催化剂活性最高。 相似文献
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介孔二氧化钛特殊的结构和性能,使其在光催化,电化学器件等方面具有多种潜在的用途而备受关注,已经成为材料科学一个崭新的研究方向.本文综述了介孔二氧化钛的合成方法及应用,并对今后研究方向进行了展望. 相似文献