共查询到19条相似文献,搜索用时 93 毫秒
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纳米二氧化钛制备的初步研究 总被引:8,自引:0,他引:8
本文采用溶胶凝胶技术制备纳米TiO2粉末,并用扫描差热分析(DTA),X射线衍射(XRD)、透射电子显微镜(TEM)等实验技术分析其微观形貌和相结构变化的规律。研究表明,采用该技术可以制造纳米TiO2,随温度升高,出现锐钛矿向金红石相的转变。 相似文献
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溶胶-凝胶技术在新型纳米气凝胶合成中的应用 总被引:8,自引:3,他引:5
综述了纳米材料的特性,介绍了溶胶-凝胶技术的原理,并以新型纳米材料气凝胶的合成为例阐述了溶胶-凝胶技术用于纳米材料合成的优越性,以期引起人们对溶胶-凝胶技术用于纳米材料合成的关键。 相似文献
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综合叙述了有关纳米级二氧化钛的制备方法,特别是溶胶-凝胶法在制备TiO2薄膜方面的应用,并对材料的表征技术进行了介绍。 相似文献
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马允 《精细与专用化学品》2014,(2):47-49
以无水乙醇为溶剂,采用溶胶-凝胶法合成中孔氧化锆,对合成的样品进行低温N2吸附-脱附、X—ray粉末衍射(XRD)、傅立叶变换红外光谱(FT—IR)等表征。结果表明,溶胶-凝胶法可以制备出具有单一晶型的四方相中孔氧化锆,其比表面积(BET)72.98m2/g,孔径2.2nm。 相似文献
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The electrochemical preparation of NaClO has been widely used for the production of industrial disinfectant. To reduce the cost of electrode preparation using the brushing method, this paper introduces a method for the electrodeposition for RuO2/Ti and RuO2‐IrO2/Ti preparation and NaCl solution electrolysis. The deposition of Ir improves the uniformity and stability of the RuO2/Ti electrode. The optimum preparation conditions and additive concentrations were investigated in detail through the orthogonal experiment. By adjusting the electroplating time, temperature and voltage, the electrode with a high content of available chlorine was synthesized successfully. The physicochemical properties of the as‐prepared RuO2/Ti and RuO2‐IrO2/Ti were determined by XRD, SEM‐EDS, and XPS, and the electrochemical performance and lifetime of the RuO2/Ti and RuO2‐IrO2/Ti was verified via an electrochemical workstation. Uniform and stable RuO2/TiO2 and RuO2‐IrO2/TiO2 were synthesized successfully for the electrolysis of the NaCl solution. 相似文献
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制备了复合氧化物催化剂WO3-SnO2用于催化H2O2氧化环己酮合成己二酸,适宜制备条件为n(WO3)∶n(SnO2)=1∶2,500℃焙烧3h,采用IR分析对其进行了表征。考察了催化剂用量、30%H2O2用量、反应时间及催化剂重复使用性等因素对己二酸收率的影响。己二酸适宜合成条件为:环己酮100mmol,催化剂1.25g,30%H2O250mL,回流反应5h,己二酸收率达82.5%。结果表明,复合氧化物WO3-SnO2的催化活性高于WO3。此外,若将WO3-SnO2进行镧改性后,催化活性虽不及WO3-SnO2,但可有效提高催化剂使用寿命。 相似文献
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制备了以混合氧化物为载体的固载杂多酸催化剂HPA/TiO2-SnO2,并催化没食子酸和正丙醇合成了没食子酸丙酯.确定最佳催化反应条件为:醇酸摩尔比为15∶1、催化剂用量为反应物总质量的2.0%、反应时间为2.5 h,在此反应条件下,没食子酸丙酯的收率达到92.1%. 相似文献
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多孔竹炭为无定形碳,具有丰富的孔结构,孔径分布在1~6 nm之间,且具有较大的孔体积(1.21 cm3/g)。本文以多孔竹炭为载体,采用溶胶-凝胶法制得B2O3-SnO2/C复合材料。SEM和TEM结果显示SnO2和B2O3均匀分布在多孔竹炭表面。多孔竹炭和B2O3有效缓冲SnO2可逆反应的体积变化,提高SnO2的循环稳定性。将B2O3-SnO2/C复合材料作为负极组装成锂离子半电池,进行电化学性能测试,在1 C(1 C=372 mA/g)倍率下充放电循环200次结束后仍然保留649.9 mAh/g的放电比容量,放电比容量保留率为58.6%。B2O3-SnO2/C复合材料充放电过程受扩散和电容两种行为控制,电容控制的贡献率随着扫描速率的增大而增大。 相似文献
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采用热分解法制备了Ti/Ru O2-Zr O2钛基金属氧化物涂层电极,利用扫描电镜、X射线衍射仪等方法对电极的形貌结构和金属涂层物相进行了表征,并以该涂层电极为阳极,经预处理的钛板作为阴极构建了电化学催化反应发生体系以处理焦化废水生化出水。结果表明,在电流密度10 m A/cm^2、p H为7、电解时间60 min、反应温度25℃的优化条件下,焦化废水生化出水经电解处理后COD去除率可达96.2%,TOC去除率达87.0%,UV254大幅下降,原水中杂环类和环烷烃类有机物可降解为单环及简单链状烃类。 相似文献
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La2/3Ca1/3Mn(1-x)FexO3溶胶凝胶制备和表征 总被引:1,自引:0,他引:1
采用溶胶-凝胶法制取一系列La2/3Ca1/3Mn(1-x)FexO3(x=0,0.01,0.02,0.05)纳米晶粉末.并用XRD,TEM 进行了表征.结果表明干凝胶在230 ℃自燃烧即可形成LaCaMnO3钙钛矿结构纳米晶,700 ℃焙烧4 h其粒径为20~50 nm.用四探针法对样品进行测量结果表明:Fe含量不同的样品的电阻与温度关系变化趋势是一致的,并且随掺杂量的增加,电阻峰值增加,其峰值对应的温度逐渐向低温区移动. 相似文献
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The RuO2-glass interaction has been studied by analyzing the growth of RuO2 particles in glasses. The size of RuO2 particles was determined by TEM and X-ray line broadening. The RuO2/glass interfacial energy was evaluated by spreading and penetration experiments.
Changes in size and shape of RuO2 particles indicated that coarsening proceeded by the diffusion-controlled dissolution-precipitation process. The growth rate of RuO2 particles at temperatures giving the same viscosity was dependent on the glass composition. Kinetics of the Ostwald ripening and values of glass surface energy implied that the solubility of RuO2 in glass is a critical factor. Results indicated that the solubility of RuO2 in glass decreases with increasing PbO content and with increasing SiO2 substitution for B2O3. Dissolution of Al2O3 from substrate retarded the Ostwald ripening. 相似文献
Changes in size and shape of RuO2 particles indicated that coarsening proceeded by the diffusion-controlled dissolution-precipitation process. The growth rate of RuO2 particles at temperatures giving the same viscosity was dependent on the glass composition. Kinetics of the Ostwald ripening and values of glass surface energy implied that the solubility of RuO2 in glass is a critical factor. Results indicated that the solubility of RuO2 in glass decreases with increasing PbO content and with increasing SiO2 substitution for B2O3. Dissolution of Al2O3 from substrate retarded the Ostwald ripening. 相似文献