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采用水热合成法制备出TiO2纳米管,通过XRD、TEM和氮气等温吸附-脱附仪等测试手段对TiO2纳米管进行了表征.用烧结的TiO2纳米管和P25粉末混合制成薄膜电极,并研究了薄膜电极的表面形貌、染料吸附量和光电性能.研究表明,加入TiO2纳米管可以制备出机械稳定的薄膜;掺杂TiO2纳米管的含量越多,薄膜电极的染料吸附量越大;掺杂5%烧结纳米管粉末的薄膜电极的光电性能最好,其短路电流可达3.25mA,光电转换效率达到1.67%. 相似文献
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利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570),对水热法制备的TiO2纳米管进行了表面改性,并用改性的纳米管为稳定剂,采用Pickering乳液聚合法制备了聚苯乙烯/TiO2纳米管复合微球。采用红外光谱(IR)、光学显微镜、高分辨透射电镜(HRTEM)、高分辨扫描电子显微镜(FESEM)、X射线光电子能谱(XPS)等分析手段,对改性前后TiO2纳米管以及复合微球的结构和形貌进行了表征,用三相接触角仪测试并优化了TiO2纳米管的表面润湿性。研究结果表明,当mKH-570/mTiO2=15%时,改性TiO2纳米管表面润湿性最佳,能很好地稳定Pickering乳液聚合,聚合后可以得到壳层为致密均匀TiO2纳米管,核为聚苯乙烯的复合微球。 相似文献
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以还原态TiO2纳米管和纳米金刚石为电极中间层和催化层掺杂改性剂,通过电沉积法制备了新型PbO2电极(Ti/TiO2-RNTs/Sb-SnO2/PbO2-ND).合成的电极表面主要为β-PbO2晶体,晶粒尺寸是17 nm.电化学分析测试表明,还原态TiO2纳米管中间层和纳米金刚石掺杂改性减少了电极电荷转移电阻,增加了电... 相似文献
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在艺术大师及其流派层出不穷、交相辉映的20世纪初,回顾莫迪里阿尼那一段历史,有着不容忽略的意义.他是一个真正的独行者,游离于所有时髦的艺术流派之外,他独特的人像创作与他对美学独到的理念遥相呼应,确立并巩固了他在现代艺术史上的地位.本文介绍了他不同时期的经历对他的艺术作品的影响,以及他短暂却又卓越的艺术生涯. 相似文献
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从今年4月1日起,国家对斜交轮胎生产企业的消费税征缴从原来的10%调整下降到3%.缴征税的调整,意味着轮胎企业缴税的负担轻了.从某种意义上来讲,有利于经营效益的提高、再生产资金的增加和积累、提高和改善职工的福利,会有更多的资金投入产品的研发和设备的更新改造,这是一个利好消息.但是,笔者认为,这是机遇和挑战并存的非常时期! 相似文献
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The strength of the randomized trial to yield conclusions not dependent on assumptions applies only in an ideal setting. In the real world various complications such as loss-to-follow-up, missing outcomes, noncompliance and nonrandom selection into a trial force a reliance on assumptions. To handle real world complications, it is desirable to make as few and as reasonable assumptions as possible. This article reviews four techniques for using a few reasonable assumptions to design or analyse randomized trials in the presence of specific real world complications: 1) a double sampling design for survival data to avoid strong assumptions about informative censoring, 2) sensitivity analysis for partially missing binary outcomes that uses the randomization to reduce the number of parameters specified by the investigator, 3) an estimate of the effect of treatment received in the presence of all-or-none compliance that requires reasonable assumptions, and 4) statistics for binary outcomes that avoid some assumptions for generalizing results to a target population. 相似文献
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对目前国内外连续重整技术的发展趋势以及技术进步所面临的问题进行了综述,并介绍了连续重整工艺技术和催化剂的最新进展。 相似文献
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N. Dudai A. Poljakoff-Mayber A. M. Mayer E. Putievsky H. R. Lerner 《Journal of chemical ecology》1999,25(5):1079-1089
Essential oils were extracted from 32 aromatic plants and evaluated for allelopathic properties. The major components of the oils were identified by gas chromatography and GC-MS. Extracts from Origanum syriacum, Micromeria fruticosa, and Cymbopogon citratus were selected for further study. The germination of several species, including wheat, was strongly inhibited by essential oils when applied at 20–80 ppm. Essential oils mixed with the top 0.5 cm of soil inhibited germination of wheat and Amaranthus seeds. This effect depended on the type of soil. The possible use of essential oils as herbicides is discussed. 相似文献
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