铝溶胶生产工艺条件的研究

试验考察了铝溶胶生产工艺条件对产品质量指标的影响。确定了HCI质量分数、反应温度、铝粒床层高度及系统循环量等因素对铝溶胶质量指标的影响趋势和程度,为稳定工艺操作条件提供了依据。     

Preparation of polymer/silica nanoscale hybrids through sol‐gel method involving emulsion polymers. II. Poly(ethyl acrylate)/SiO2

Poly(ethyl acrylate) (PEA)/SiO₂ hybrids with different compositions were prepared under different casting temperatures and pH values. Their morphology as investigated by transmission electron microscopy (TEM) shows that samples with different compositions have different morphologies. When the SiO₂ content is lower, PEA is the continuous phase and SiO₂ is the dispersed phase. At higher SiO₂ content, the change in phase morphology takes place, nd PEA gradually dispersing in the form of latex particles in SiO₂ matrix. Change in phase morphology depends mainly on the time the sol‐gel transition occurs. At suitable casting temperature and pH value, PEA/SiO₂ in 95/5 and 50/50 hybrids with even dispersion was obtained. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3532–3536, 2002     

Nanocrystalline tetragonal zirconium oxide stabilization at low temperatures by using rare earth ions: Sm and Tb

Zirconium oxide was synthesized by the sol–gel method and the tetragonal structure was stabilized up to 1000 °C by doping with different rare earth ions. The evolution of the crystalline structure as a function of the annealing temperature and rare earth concentration of doped and undoped samples were investigated by X-ray diffraction. Our experimental results show that it is possible to obtain up to 73 wt.% of tetragonal content by doping the ZrO₂ with 2 mol% of Sm₂O₃ or Tb₂O₃ and annealing at 1000 °C. Variations in the lattice parameters and nanocrystallite size were also obtained. Our results suggest that the stabilization of tetragonal structure can be obtained with other rare earth ions.     

氧化锆粉料中颗粒聚集状态的研究

用各种测试方法研究了氧化锆颗粒的聚集状态,如用 BET 方法测定了粉料的比表面积,用扫描电镜和以计算机控制电子束的扫描电镜测定了颗粒的平均粒径及粒度分布等。同时,在水介质中测定了颗粒的ξ—电位和相应的 pH 值。实验结果表明:颗粒的聚集状态与其表面的荷电状态有关。粉料在球磨过程中,表面的荷电状态发生变化,因此颗粒的聚集状态也将随之改变。根据实验结果,提出了用以表示氧化锆颗粒间“软”聚集状态强度的参数。     

氧化锆膜的制备和表征

本文以氧氯化锆为原料用Ｓｅｌ－Ｇｅｌ技术在多孔陶瓷管上制备了ＺｒＯ２膜，文中考察了草酸氧锆溶胶的粒子大小和流动特性，用ＳＥＭ、气体流动法等手段对氧化锆膜的结构、形貌与孔径大小分布进行了表征，并对膜的气体渗生进行了考察，实验表明，用这种方法制备出的氧化锆膜无针孔、无缺陷，且孔径分布集中     

Characterization and CO Catalytic Oxidation of CuO／Ce-Zr-La-O Catalyst

The Ce-Zr-La-O solid solution was prepared by the sol - gel method. The structure and the redox behavior of Ce-Zr-La-O solid solution and CuO/Ce-Zr-La-O catalysts were investigated by using XRD, Raman and TPR techniques. The result shows that the reduction capability of Ce0.7Zr0.3-y LayO solid solution is related to content of La. Appropriate content of La can enhance the redox capability of the solid solution. The oxidation activity of the CuO (6%)/Ce0.7Zr0.15La0. 15O catalyst is the highest. CuO, which finely dispersed and interacted with the support, is the site of oxidation activity.     

纳米复合材料的研究及应用前景

纳米复合材料是由纳米尺寸的粒子分散在三维基体里形成的一类新的复合材料。就目前来看其制备方法有溶胶－凝胶法、高温熔融法、气相沉积法、人工超结构法、注入分散法、无机晶体生长法以及相转变法。其结构表征可以通过Ｘ射线衍射、透射电子显微分析、小角Ｘ射线散射、径向分布函数和拉曼光谱。纳米复合材料表现出明显的量子尺寸效应（光吸收边蓝移现象）和三阶非线性光学系数的提高，可望在光学双稳态、快速响应、相位共轭、光波导等光电子器件方面得到应用。是一类十分重要的材料。国外的研究十分活跃。本文以ＣｄＳ·ＳｉＯ２纳米复合材料为例，介绍了其制备方法、结构表征和性能分析以及应用前景。     

氯丁橡胶胶粘剂制备方法的探讨

氯丁橡胶胶粘剂的制备有3种方法，现常用混练法和直接溶胶法，通过对比和说明，用高剪切直接溶胶法制得的氯丁胶流动性好，涂层表面平滑，贮存稳定，生产效率高，成本低，建议各氯丁橡胶胶粘剂生产企业采用高剪切直接溶胶法。     

溶胶-凝胶法制备SrBi2Ta2O9(SBT)的研究

通过几种材料体系的选择，采用溶胶－凝胶法制备出钙钛矿相钽酸锶铋（SBT）铁电粉体。以乙醇钽、醋酸锶、硝酸氧铋作为原材料，乙二醇作为溶剂，用醋酸调节溶液pH值到3．5，溶胶水解可获得凝胶，干凝胶在350℃处理30min后，在800℃烧结1h可得到SBT粉体。分析150℃下获得的干凝胶表明，硝酸酯的产生促进了硝酸氧铋在乙二醇中的溶解性。对凝胶进行差热－热重（TG－DSC）和红外光谱（IR）表征，结晶粉体用X射线（XRD）进行表征。     

乳液法制备氧化锆粉料的研究

研究了以煤油为油相，锆盐水溶液为水相，以Ｓｐａｎ—８０或ＩｇｅｐａｌＣＯ—５２０为表面活性剂的油包水型乳化液的稳定性、粘度和导电率，并确定以此乳化剂制备氧化锆粉料的工艺参数和制得粉料的性能．