Al3+-SiO2共掺杂TiO2光催化膜的制备及超亲水改性

为了提高TiO2光催化薄膜的利用效率,实验采用金属离子Al3+和氧化物SiO2共掺杂的方法,制备以TiO2为基体的复合光催化薄膜.利用简单易行的溶胶-凝胶法结合超声分散技术以两种不同的方式,一种是同步将Al3+和SiO2共掺杂于TiO2溶胶中,制备多元素共掺杂混合溶胶,采用浸渍提拉的方法以玻璃片为载体涂膜,然后运用马弗...     

Ca<Subscript>3</Subscript>WO<Subscript>6</Subscript>: a novel microwave dielectric ceramic with complex perovskite structure

Present work introduces a novel Ca₃WO₆ microwave dielectric ceramic with a complex perovskite structure. The Ca₃WO₆ ceramic was prepared by solid state reaction method and can be well densified at above 1,260 °C for 2 h in air. All the XRD patterns can be fully indexed as a single-phase monoclinic structure (space group P2₁/n). The sharp Raman vibration mode at 810 cm⁻¹ suggests the long range order in the Ca₃WO₆ structure. The best microwave dielectric properties can be obtained in ceramic sample sintered at 1,275 °C for 2 h with a permittivity ~15.3, a Qf value ~29,200 GHz and a TCF value about −30 ppm/°C. Applying the oxide additivity rule, the calculated permittivity agrees well with the measured value. This kind of ceramic might have some potential value for microwave application for its good microwave dielectric behavior. The (Ca_1/2W_1/2) complex cations holding the site of Ti⁴⁺ in perovskite structure would introduce many new systems in complex perovskite compounds in the future.     

Photocatalytic bactericidal mechanism of nanoscale TiO2 films on Escherichia coli

Two kinds of nanoscale TiO2 films were prepared by magnetron sputtering and screen printing methods, respectively. Results show that both phase composition and specific surface area of the film affect the photocatalytic bactericidal efficiency. Time-series in situ atomic force microscopy (AFM) observation were further used to characterize the cellular responses of Escherichia coli (E. coli) in photocatalytic process. Some nanosized patches were found on the bacterial surface in the forepart of photocatalytic reaction. It suggested that the photocatalytic attack induced the self-protection of bacteria at first. Subsequently, some cracks on the surface and the enlargement of cell body indicated that the cell wall was damaged and lost its structure supporting function, and it eventually led to the death of bacteria.     

Room temperature ferromagnetism in sputtered Zn1 − xCrxO thin films

Cr doped ZnO (Zn_1 ? xCr_xO) thin films with different Cr concentrations (0.4, 1.5, and 8.9 at.%) were deposited on Si substrates using RF magnetron sputtering. Film crystal structure was characterized using X-ray diffraction, and vibrating sample magnetometer measurements were used to investigate their magnetic properties. Unstable ZnO structure is present at low Cr concentrations, while secondary phases appear at higher Cr concentrations. 8.9 at.% Zn_1 ? xCr_xO film exhibits room temperature ferromagnetism and high 325 K Curie temperature, even after 300 °C annealing for 1 h. This result is promising and demonstrates Cr doped ZnO film's potential use in practical applications.     

Ab initio study of AlCu2M (M = Sc,Ti and Cr) ternary compounds under pressures

The structural, electronic and elastic properties of the AlCu₂M (M = Sc, Ti and Cr) compounds in the pressure range of 0–100 GPa was investigated based on density functional theory. The calculated lattice parameters of the AlCu₂M compounds at zero pressure and zero temperature are in very good agreement with the existing experimental data. The bulk modulus, shear modulus and Young’s modulus increases with the increase of pressure, which indicates that higher materials hardness may be obtained when increasing pressures. The bulk modulus and Young’s modulus of AlCu₂Cr is the greatest under pressure. The shear modulus of AlCu₂Ti is the highest above 30 GPa, while that of the AlCu₂Sc is the strongest below 30 GPa. The calculated B/G values at zero and higher pressure indicated that they are ductile materials. The electronic densities of states and bonding charge densities have been discussed in details, revealing these compounds exhibit half-metallic behavior. In addition, the pressure dependences of Debye temperatures of AlCu₂M compounds have also been calculated. The results indicate that Debye temperatures increase with increasing pressure.     

大庆HDPE装置改扩建可行性分析

大庆石化总厂规划在“九五”期间将30万t/a乙烯装置扩建到48万t/a,HDPE装置是主要的乙烯使用装置。根据该装置几年来的生产实践及与日本三井油化同类装置生产情况的对比,并经过对主要操作单元的详细计算,对该装置设计能力由14万t/a扩建到24万t/a进行了可行性分析,提出了通过对部分设备进行改造后,产量提高10万t/a是可行的。     

Ⅰ~#中定剂小试成果在中试生产中的应用及改进

介绍了以N-乙基苯胺、光气为原料，制备Ⅰ#中定剂（N，N-二乙基二苯基脲）的生产过程，并指出了该过程与其它生产方法的不同和优点，以及产品外观颜色的控制要点。     

聚己内酯—共聚醚制备聚氨酯弹性体的研究

以聚己内酯、四氢呋喃－环氧丙烷共聚醚、甲基二异氰酸酯、ＭＯＣＡ等为原料,制备了浇注型聚氨酯弹性体了聚己内酯与共聚醚的比例、ＮＣＯ质量分数、增塑剂与ＭＯＣＡ用量比例对弹性体力学性能的影响。以最佳工艺条件制得的弹性体,其性能为：邵尔Ａ型硬度为５７￣５８,３００％模量３．８￣３．９ＭＰａ,拉伸强度１８．５￣１９．５ＭＰａ,扯断工率４５０￣４６０％,撕裂强度２８￣３０ｋＮ／ｍ。     

两种杯[6]芳烃的红外光谱和拉曼光谱研究

研究了两种对－叔丁基杯〔６〕芳烃的红外和拉曼光谱。对－叔丁基杯〔６〕芳烃Ｉ的环状的分子内缔合氢键和部分甲基化的（１,３,５－三甲基）－对－叔丁基杯（６）芳烃Ⅱ的三中心氢键在红外光谱中有明显反映杯（６）芳烃的ｐｉｎｃｈｅｄ ｃｏｎｅ（紧锥型）构象也得到了证明,而两种杯（６）芳烃氢键构象和强度的不同导致了二者的拉曼谱图也存在较大的差异。     

生物膜法处理炼油废水

对影响生物膜内微生物活性的几个因素进行初步探索 ,并进行了生物接触氧化工艺去除炼油废水中氨氮和 COD的实验研究。实验发现在 COD≤ 50 0 mg/L的废水中 ,生物膜内异养细菌并不影响硝化细菌的代谢。生物接触氧化工艺能高效且稳定地同时去除废水中氨氮和 COD。