PP/WSPET/ZnO三元共混合金的流变性研究

用CFT-500型毛细管流变仪研究了PP/WSPET/ZnO共混体系的流变性能。研究结果表明:PP/WSPET/ZnO共混合金为典型的假塑性流体,WSPET含量增加,流体产生不稳定流动的临界剪切速率增大。共混合金的表观黏度和零切黏度随WSPET含量和温度提高而减小。黏度对温度的依赖性随WSPET含量增加和剪切速率的增大而减小。     

纳米氧化锆/氧化锌光催化降解酸性红B的研究

以醋酸锌和氯氧化锆为原料，采用化学沉淀法制备了纳米氧化锆／氧化锌光催化剂。在中性条件下研究了催化剂煅烧温度，锆复合量，催化剂用量，染料初始质量浓度，过氧化氢质量浓度，各种阴、阳离子等条件对酸性红B脱色反应的影响。结果表明，该催化剂最佳制备条件为煅烧温度350℃，锆复合量2．5％（物质的量分数）。催化剂最佳用量0．9g／L。提高染料初始质量浓度会降低反应脱色率。适量过氧化氢可提高反应脱色率，当其质量浓度超过300mg／L会起负作用。NO3^-对反应影响不大；Fe^3＋和Ag^＋对反应起促进作用；SO4^2-，Cl^-，NO2^-等阴离子和Fe^2＋，Mn^2＋等阳离子对反应起抑制作用。     

纳米氧化锌的制备与表征

对传统的直接沉淀法进行了改进 ,对反应温度、搅拌速度、投料方式及洗涤条件等多种因素对产物纳米氧化锌的影响进行了研究。结果表明 ,改进的直接沉淀法制备纳米氧化锌具有工艺简单、成本较低 ,能够得到六方晶系、球形 ,粒径约为 15～ 2 5nm的纳米氧化锌     

On the oxidative coupling of methane with carbon dioxide over CeO2/ZnO nanocatalysts

The nano-CeO₂/ZnO catalysts were prepared using a novel combination of homogeneous precipitation with micro-emulsion for oxidative coupling of methane with CO₂ as an oxidant. The prepared catalysts were compared with those prepared using the conventional impregnation. The catalysts prepared in two ways were characterized with FTIR, TEM, XRD and CO₂-TPD. The effects of the reaction temperature, the amount of ZnO doped in the catalysts and the average size were investigated. The experimental investigation demonstrated that methane conversion over the nano-CeO₂/ZnO catalysts prepared by the combined technique was higher than that obtained over catalysts prepared by the conventional impregnation. A better low-temperature activity has also been achieved over the nanocatalysts. There was no clear trend between the average size of nano-CeO₂/ZnO catalysts and their catalytic performance but methane conversion increased with increasing fractal dimension of nanocatalysts.     

Growth and formation mechanism of sea urchin-like ZnO nanostructures on Si

Sea urchin-like nanostructures of ZnO consisting of ZnO nanowires with blunt faceted ends were grown on Si (100) substrates by oxidation of metallic Zn at 600 °C. ZnO nanowires having a diameter of 30–60 nm and length of 2–4 Μm were in similar shape with uniform diameter along its entire length with well faceted blunt ends. X-ray diffraction and transmission electron microscope analysis showed that the as-grown nanostructures were highly crystalline with wurtzite hexagonal structure having lattice constants of a=b=3.25 å and c=5.21 å. Room temperature photoluminescence (PL) measurements showed a weak near band-edge emission at 380 nm, but a strong green emission at 500–530 nm. A model for vapor-solid (VS) growth mechanism of ZnO nanowires was presented, in which nucleation of ZnO is crucial for the growth of the nanostructures.     

氧化锌半导体材料的性能研究与制备进展

氧化锌半导体材料以其优良的光电性能在光电子、传感器、透明导体等领域得到广泛应用。综述了氧化锌半导体功能材料在敏感材料、压电材料、导电薄膜等方面的性能、应用及薄膜的制备技术，相对于三维块体材料，氧化锌薄膜可以适应大规模集成电路的需要，更具发展前途和研究价值。氧化锌薄膜的性质随掺杂组分和制备条件的不同而表现出很大的差异性。     

NCT310型常温氧化锌脱硫剂的研究

介绍了NCT310型常温氧化锌脱硫剂实验室研究情况。结果表明，在常温（20～60℃）下，该脱硫剂对气体中的硫化氢有优越的脱除性能。在40℃、1000h-1、进口H2S～1．5g／m3条件下，可控制出口H2S＜7×10－4g／m3，穿透硫容（重量比）＞10％。     

基于环形微热板的ZnO微气体传感器设计

提出一种新型的设有环形结构微热板的硅基ZnO微气体传感器。利用ANSYS软件,将环形电极结构与传统的蛇形结构进行温度分布的模拟仿真,发现该结构能供给传感器更高的温度且中心温度分布均匀,进而解决了现有传感器功耗大的缺点。通过对RF磁控溅射ZnO薄膜的工艺摸索,得出了适宜作气敏薄膜的制备参数。该传感器在250℃下对（200-1000）×10-6CH4气体有很好的响应。     

EXAFS and XPS Investigations of Cu/ZnO Catalysts and Their Interaction with CO and Methanol

Several investigations have been carried out on Cu/ZnO catalysts by employing extended Xray absorption fine structure (EXAFS) and Xray photoelectron spectroscopy (XPS). EXAFS investigations of Cu/ZnO catalysts subjected to hydrogen reduction show the presence of Cu¹⁺ species and Cu microclusters. The proportion of Cu¹⁺ depends on the rate of increase of the reduction temperature and on the amount of alumina added. An XPS study of the interaction of CO with model Cu/ZnO catalysts prepared in situ in the electron spectrometer shows the formation of CO₂ ^-, CO₃ ^2- and C₂O₄ ^2- species, their proportion relative to CO increasing with the Cu¹⁺/Cu⁰ ratio. A study of the interaction of CH₃OH with Cu clusters deposited on ZnO films reveals reversible molecular adsorption and the formation of CH₃O on clean Cu clusters. If the Cu clusters are pretreated with oxygen, however, both CH₃O and HCOO^- species are produced. Model Cu/ZnO catalyst surfaces containing both Cu¹⁺ and Cu⁰ species show interesting oxidation properties. On a Cu⁰-rich catalyst surface, only the CH₃O species is formed on interaction with CH₃OH. On a Cu¹⁺rich surface, the HCOO^- ion is the predominant species.     

CDs/ZnO/g-C3N4三元组份协同作用促进光催化降解染料

采用浸渍-热聚合法制备CDs/ZnO/g-C3N4复合材料，考察其对罗丹明B的光降解效率。利用 XRD、TEM、XPS、UV-Vis DRS、FI-IR等手段对催化剂进行表征和评价。结果表明：CDs/ZnO/g-C3N4仍保持石墨相g-C3N4的晶型结构，三元组份相互协同作用使CDs/ZnO/g-C3N4表现出优异的光催化性能，其降解罗丹明B的效果优于单体g-C3N4、ZnO及ZnO/g-C3N4，脱色率可达到70%左右。