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采用阳极氧化的方法,通过改变电压的施加方式制备了具有不同形貌的氧化钛薄膜。使用扫描电子显微镜考察了氧化钛薄膜的形貌,结合实验现象探讨了阳极氧化钛薄膜纳米孔的形成机制。研究结果表明,采用一步施加电压和连续施加电压的方法,氧化钛薄膜纳米孔的形成过程由电压、阻挡层的厚度决定;采用两步施加电压的方法,氧化钛薄膜纳米孔的形成过程由放电电压、阻挡层的厚度和阻挡层/电解液的边界条件协同控制。在相同工艺条件下,采用两步施加电压法能够扩展阳极氧化钛薄膜纳米孔孔径和孔密度的范围。 相似文献
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《化工进展》2017,(7)
氧化钛纳米片材料为一种新兴的二维层状材料,在催化、环境、能源和电子领域引起人们广泛的关注。本文从催化研究的角度出发,综述了氧化钛纳米片材料的结构、制备方法、金属及非金属元素的掺杂、纳米片基复合材料和其在光催化、光电催化和热催化等方面的应用进展。分析表明氧化钛纳米片材料拥有特殊的形貌和特别的物理化学性质,通过控制材料的组成及结构变化,能够实现氧化钛纳米片材料的多种功能化。指出氧化钛纳米片材料虽然有着优良的性能,但是在实际应用中远不能满足要求。因此,优化合成和探索新形式的二氧化钛纳米片材料,对其表面进行改性及开发具有特殊功能纳米复合材料是解决其瓶颈的有效途径。探索催化反应过程中的反应机理,开发氧化钛纳米片基工业应用催化剂将是今后重要的研究方向。 相似文献
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纳米水泥石导电性与压敏性的试验研究 总被引:1,自引:0,他引:1
探讨了纳米水泥石电阻率的测试方法,而后利用正交设计以及单因素试验法研究了掺加有2种不同相的纳米氧化钛水泥石的导电性和压敏性。结果表明:纳米氧化钛会增加水泥石的极化作用,适当的测试方法可以消除极化作用对电阻率测试结果的影响;具有纳米效应的纳米氧化钛可以在水泥石内部形成导电网络,从而有效地改善水泥石的导电性;与掺有具有非半导体特性的纳米金红石相氧化钛的水泥石不同,掺有具有半导体特性的纳米锐钛相氧化钛的水泥石具有压敏性,且其电阻率变化率约为7%~10%。 相似文献
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《化工经济技术信息》2004,(3):3-4
过强的太阳紫外线照射对人体健康危害很大.除了涂抹防晒霜等护肤品外,目前开发有效屏蔽紫外线的功能性织物,已成为国际化纤纺织业的热点。记2月13日从上海交通大学获悉,该校科研人员完成的纳米氧化钛(TiO2)抗紫外纤维研制项目.为人体护肤防晒提供了新的解决方案。 相似文献
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纳米二氧化钛的气相合成 总被引:12,自引:0,他引:12
综述了TiCl4氢氧焰水解法、TiCl4气相氧化法、钛醇盐气相氧化法、钛醇盐气相水解法和钛醇盐气相热解法合成纳米二氧化钛的技术进展。气相法合成纳米二氧化钛的研究热点是工艺参数、反应物的混合方式、添加剂、外加电场和反应器型式对纳米二氧化钛的微结构和性能的影响,用计算流体力学、反应动力学与气相颗粒形成模型相结合来模拟过程和改进反应器设计也是一个令人关注的研究领域。TiCl4气相氧化法由于其具有经济、环保和生产工艺的柔性等优点而最具竞争力。控制纳米二氧化钛粒子的形态、粒径分布、比表面积和晶型组成以及防止反应器壁二氧化钛结疤是气相法规模化生产纳米二氧化钛需重点解决的问题。 相似文献
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A method of preparing nanosized titanium dioxide by gaseous detonation by using ethanol, hydrogen, and oxygen as an explosion source and titanium tetrachloride as a precursor is described. The results indicate that the rutile phase content of the obtained products is high, and the pure rutile phase can be produced by adding a small amount of hydrogen. Most of the particles obtained under the two different synthesis conditions are spherical (or sphere-like) with small and even particle sizes, generally about 30 nm, and has a very good size dispersion. 相似文献
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Makoto Kobayashi Valery Petrykin Masato Kakihana Koji Tomita 《Journal of the American Ceramic Society》2009,92(S1):S21-S26
Nanowhiskers of rutile-type titanium dioxide (TiO2 ) were synthesized by a simple hydrothermal treatment of a water-soluble titanium–glycolate complex at 473 K. The aspect ratio of the obtained rutile particles could be controlled by changing the concentration of the glycolic acid additive in the starting aqueous solution of the titanium complex. According to high-resolution transmission electron microscopy, whisker-like nanoparticles grow along the c -axis of rutile, the side facets of which are (110), (−110), (1–10), and (−1–10). Glycolic acid controls promotion of the rutile particles in the specified direction due to its preferred adsorption on the titanium-rich facets. Evaluation of the photocatalytic activity of the synthesized TiO2 was performed in terms of decomposition of oxalic acid in an aqueous system under ultraviolet irradiation. It turned out that this particular whisker-like shape is responsible for the tremendous enhancement of rutile photocatalytic activity, and even rutile samples with low surface area demonstrated photocatalytic performance comparable with one of the best nanosized anatase photocatalytic materials. Therefore, it can be concluded that the (110) rutile facet plays an important role in the photocatalytic oxidation reaction, and that it exhibits higher photocatalytic activity than the (001) facet in the decomposition of oxalic acid. 相似文献
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Lili Wang Xiaying Jiang Chenglong Wang Yi Huang Yiding Meng Jianzhong Shao 《Coloration Technology》2020,136(1):15-22
To improve the properties of titanium dioxide particles and realise their firm anchorage in blue light curing film, three modified titanium dioxide particles were prepared by grafting 3‐(trimethoxysilyl)propyl methacrylate, 3‐aminopropyltriethoxysilane and hexadecyltrimethoxysilane. The surface changes of titanium dioxide particles after modification were characterised. The dispersion stability, photo‐polymerisation, rheological and mechanical properties of modified titanium dioxide blue light curing inks were investigated. Results showed that compared with native titanium dioxide, modified titanium dioxide particles were more appropriate for blue light curing ink. The particle sizes of the three modified titanium dioxide particles became smaller, their surfaces exhibited hydrophobicity, and the viscosity of the modified titanium dioxide inks decreased slightly. Of the three modified titanium dioxide particles, 3‐(trimethoxysilyl)propyl methacrylate‐ and hexadecyltrimethoxysilane‐modified titanium dioxide particles exhibited better dispersion stability in blue light curing ink. In particular, 3‐(trimethoxysilyl)propyl methacrylate‐modified titanium dioxide blue light curing ink showed the best photo‐polymerisation and mechanical properties, which indicated the participation of the pigment grafted by double bonds in the blue light curable polymerisation. Using modified titanium dioxide in blue light curing ink, the dry/wet rubbing fastness of the printed fabrics improved. 相似文献
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Formation of Titanium Carbide/Aluminum Oxide Nanocomposite Powder by High-Energy Ball Milling and Subsequent Heat Treatment 总被引:1,自引:0,他引:1
The preparation of titanium carbide/aluminum oxide (TiC/Al2 O3 ) nanocomposite powders from a mixture of titanium, carbon, and Al2 O3 powders via a high-energy ball milling process and subsequent heat treatment was investigated. The microstructure development of the powder mixtures was monitored by X-ray diffraction and transmission electron microscopy. The ball milling of an elemental carbon, titanium, and Al2 O3 powder mixture at ambient temperature resulted in the formation of TiC within 15 h of milling. With further milling of up to 25 h, the resulting powder mixture was composed of nanosized TiC particles and nanocrystalline carbon, titanium, and Al2 O3 . The nanocrystalline titanium and carbon were transformed into nanosized TiC particles after subsequent heat treatment. The final product was composed of nanosized TiC and microcrystalline Al2 O3. Most of the nanosized TiC particles were located within Al2 O3 grains. 相似文献