ZrO2直接电脱氧反应机理的初步研究

采用循环伏安法和记时电流法研究800~860℃下ZrO2电极在CaCl2-NaCl熔盐中还原过程的反应机理.ZrO2电极在CaCl2-NaCl熔盐中的循环伏安曲线和XRD物相分析结果表明,可以通过直接电脱氧法由ZrO2制备金属Zr,并且ZrO2的还原分步进行,ZrO2先还原为ZrO,ZrO再还原为Zr.     

Supercritical CO2-based solvents in next generation microelectronics processing

Large amount of chemicals and highly purified-water are needed in microelectronic manufacture. The ability of solutions to penetrate tiny spaces will become significantly more challenging as the feature size of semiconductor devices decreases to nanoscale dimensions and the functional complexity of integrated circuitries (ICs) ever increases. Supercritical fluids (SCFs) possess a unique combination of properties (no surface tension and gas-like viscosity) that can potentially be exploited for application in microelectronics manufacturing and processing in response to needs for material-compatible cleaning systems, small-dimension developing solvents, and low chemical-use processes. Recent microelec- tronics processes for cleaning and rinsing of patterned porous low-k dielectrics and drying of photo- resist in CO2-based solvents are the main focus of this review. Additional topics in supercritical fluid processing include spin coating of photoresists, development with nanoscale dimensions, metal deposition and silylation.     

The research and progress of micro-fabrication technologies of two-dimensional photonic crystal

The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crystal device that the photonic crystal integration could be realized. Therefore, we should first investigate photonic crystal devices based on the active and the passive semiconductor materials, which may have great potential application in photonic integration. The most practical and important method to fabricate two-dimensional photonic crystal is the micro-manufacture method. In this paper, we summarize and evaluate the fabrication methods of two-dimensional photonic crystal in near-infrared region, including electron beam lithography, selection of mask, dry etching, and some works of ours. This will be beneficial to the study of the photonic crystal in China.     

纳米二氧化钛制备技术的研究进展

根据近年来国内外纳米二氧化钛的研究现状,综述了纳米二氧化钛的制备技术,介绍了各种制备技术的制备原理,对各种制备方法的优缺点进行了比较.最后,对纳米二氧化钛在未来的发展和应用进行了展望.     

微波-二元醇技术制备Au/TiO2及其光催化消除臭氧

以TiO2为载体,利用微波加热HAuCl4的乙二醇溶液,制得了负载型的Au/TiO2催化剂,采用透射电子显微镜(TEM)、漫反射光谱(DRS)、X射线光电子能谱(XPS)等现代表征技术对Au/TiO2催化剂进行了表征,并考察了其光催化分解臭氧的性能.结果表明,微波辅助制备的Au/TiO2催化剂具有较高的光催化消除臭氧活性.     

大型水厂二氧化氯应用中的问题及对策

通过对水厂一年多的生产运行状况的考察,总结了二氧化氯替代氯气预氧化、消毒工艺中遇到的问题.根据水厂的实际情况,提出了预热原料和空气、在二氧化氯发生器的空气管路上加装流量计和报警装置、改善管路设计、多点投加二氧化氯和对反应沉淀池和滤池进行遮光处理等多项措施,达到提高二氧化氯产率、保证工艺的稳定性、确保二氧化氯发生器的安全性,降低二氧化氯的衰减速率的目的.     

TiO_2表面掺杂CeO_2和NiO及光催化活性研究

以硫酸镍、硝酸铈为掺杂剂,在TiCl4水解过程中,以沉淀包覆或机械混合的掺杂方法制备了改性TiO2粉体,进行了X射线衍射表征和光催化活性评价。晶粒的长大受到了抑制,在450℃焙烧下,掺镍样品的平均粒径由未掺杂纯样品的38.2 nm减小到11.5 nm(机械混合)和8.4 nm(沉淀包覆),掺铈样品的平均粒径则分别减小到30.5 nm和14nm;镍掺杂导致了样品在焙烧温度450℃时便有金红石相析出,而铈掺杂的样品和纯样品在相同温度下没有金红石相;通过甲苯在样品上的光催化氧化过程,证实了掺杂对样品的光催化性能有影响。在纯样品和掺镍、掺铈的样品上,130 min后甲苯的质量浓度由初始的80 mg/m3分别下降到20、2.5和8.6 mg/m3。     

Effects of lanthanum and gadolinium on proliferation and differentiation of primary osteoblasts

The effects of La³⁺ and Gd³⁺ on the proliferation, differentiation and adipogenic transdifferentiation of rat calvarial osteoblast-like cells (ROB cells) were evaluated by MTT method， measuring the activity of alkaline phosphatase (ALP) and Oil red O measurement. Both of La³⁺ and Gd³⁺ inhibited the proliferation of ROB cells at all concentrations (1×10^-5, 1×10^-6, 1×10^-7, 1×10^-8, 1×10^-9 mol?L^-1). La³⁺ at concentration of 1×10^-5 mol?L^-1 significantly increased the alkaline phosphatase activity of ROB cells up to 3 folds (P<0.01). However, the effects reversed to inhibit at other concentrations. Gd³⁺ played a negative role in the alkaline phosphatase activity. La³⁺ inhibited the adipogenic transdifferentiation of ROB cells at all concentrations in a dose-dependent way. However, Gd³⁺ promoted the adipogenic transdifferentiation of ROB cells at 1×10^-8 and 1×10^-9 mol?L^-1. These findings suggested that the effects of rare earth elements on the proliferation, differentiation and adipogenic transdifferentiation of ROB cells were dependent on their concentrations and species     

TiO2/ACF吸附-光催化净化甲醛的研究

基于纳米TiO2在气相光催化领域的应用,针对室内环境中长期严重影响人体健康的污染物——甲醛,采用单因素分析法,探讨纳米TiO2光催化剂负载量、光照强度对光催化降解甲醛产生的影响;在此基础上调整活性碳纤维负载量以得到两者间最佳配比方案.结果表明,光强较大、纳米TiO2中度负载且活性碳纤维负载量为5.8g/m^2时,光催化反应效果较好,甲醛浓度由初始状态下的0.80 mg/m^3降至0.02mg/m^3.     

高糖诱导人脐血间充质干细胞向胰岛样细胞分化

目的:探讨脐血间充质干细胞向胰岛样细胞分化的潜能.方法:分离脐血有核细胞,将其置于MesencultTM培养基中进行培养,并利用贴壁法进行纯化、扩增.扩增后的脐血间充质干细胞用含体积分数5%胎牛血清的H-DMEM持续诱导.采用胰岛素免疫荧光染色对诱导后的细胞进行鉴定,定量检测胰岛素分泌水平及其对葡萄糖刺激的反应性.结果:诱导后,细胞形态发生明显变化,变圆而且聚集成团;细胞的胰岛素免疫荧光染色为阳性;而且细胞能分泌少量胰岛素,并对糖刺激具有反应性.结论:在高糖环境中,脐血间充质干细胞具有向胰岛样细胞分化的潜能.