CuO纳米线中的取向畴

通过简单的热氧化法,可以得到不同取向畴的CuO纳米线结构.利用群论的知识,从理论上推导出CuO纳米线中存在11种畴壁结构,其中5种已经被实验证实.同时,在800℃下得到直径较大的CuO纳米线,利用透射电子显微学相关技术分析发现,这种纳米线中存在一种新的畴壁结构,而且也属于理论上得到的11种畴壁之一.本文利用群论分析,解释了CuO纳米线中取向畴结构的生成机制,对调控CuO纳米材料的生长具有指导作用.     

CuO-Zr复合膜的制备及其反应光声光谱研究

以CuO和Zr为靶材,利用磁控溅射技术,采用最佳工艺条件,在载玻片衬底上沉积了Zr/CuO和CuO/Zr复合膜.利用X射线衍射、扫描电镜和反应性光声光谱技术分别对薄膜样品的晶体结构、表面形貌和反应特性进行了分析和表征.结果表明:复合膜中的Zr和CuO均以晶相形式存在,复合膜由近似球状的纳米粒子构成,在激光能量的刺激下CuO-Zr复合薄膜发生了氧化-还原反应.     

Ni2O3/CuO/Sb2O3:SnO2下转换材料光谱特性试验研究

以氧化锡为主要材料,掺杂过渡元素氧化物,采用高温烧结法制备了在1.06 μm处具有激光吸收性能的下转换粉体材料.对材料的1.06 μm激光吸收性能、晶相结构、表面形貌以及光谱下转换位移进行了表征.最后,将合成材料制备成涂料样品,测试1.06 μm激光吸收性能.结果表明,该材料对1.06 μm激光具有较高的吸收性能.     

Influence of monovalent cations and CuO nanoparticles on X-nanozeolite in uranium anionic species separation from contaminated drinking water

The main purpose of this work was the modification of NaX nanozeolite using copper oxide nanoparticles and various monovalent cations such as K~+, Cs~+, and Ag~+in order to make the negatively charged zeolite surface accessible for anionic forms of uranium which are the most dominant species of uranium in the contaminated radioactive waters at natural p H. Various methods such as the X-ray fluorescence(XRF), X-ray powder diffraction(XRD), field emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), Fourier transform infrared spectroscopy(FT-IR), and atomic absorption spectroscopy(AAS) were used to characterize the final synthesized absorbents. Batch technique was used to study the adsorption behavior of uranium ions from polluted drinking water by Na X nanozeolite and its modified forms. In order to better understand the performance of them, the results were compared with those that were obtained for synthesizing bulk NaX zeolite and Na-form of clinoptilolite natural zeolite. Preliminary results indicated that uranium sorption increased as the loading level of CuO nanoparticles on NaX nanozeolite increased from 2.1 wt% to 11.2 wt%. In addition,from the obtained data, an increase in uranium removal efficiency resulted as charge/ionic radius ratio of exchanged cation decreased. Also, the effect of contact time, solid–liquid ratio, initial concentration and temperature on the adsorption process was studied. It is worth mentioning that, in this study, the sorption of uranium was performed under natural conditions of pH and the presence of competing cations and anions which are available in drinking waters.     

炭基锌锰铜煤气脱硫剂的硫化行为研究

对锌、锰、铜摹单金属和复合金属氧化物脱硫剂的脱硫性能进行了讨论,并对炭材料作为脱硫剂和载体的研究现状进行了分析,同时对活化半焦作为脱硫剂载体的可行性进行了探讨.认为复合金属氧化物脱硫剂能够发挥单氧化物的优势,并克服其不足.将复合金属氧化物负载于炭材料上,可提高金属氧化物活性组分的利用率,改善脱硫剂的硫化性能,同时降低脱硫剂成本,使炭基锌锰铜复合金属氧化物煤气脱硫剂具有广阔的应用前景.     

The Effect of Additives on Cu/HZSM-5 Catalyst for DME Synthesis

The addition of ZnO or ZrO₂ into CuO/HZSM-5 was investigated for DME synthesis from syngas by using the reactive frontal chromatography method, TPR and in situ TPR. These promoters enhanced the catalytic activity of Cu/HZSM-5 and promotion with ZnO and ZrO₂ produced a maximum activity, which could be explained by the improvement of the dispersion of Cu and the promotion of CuO reduction. The Cu⁺ species existing during the reaction have been detected, based on which a Cu⁰ Cu⁺¹ redox cycle model was put forward.     

富氢气氛中CO选择性氧化催化剂的研究

研究了以表面修饰改性的纳米Al2O3和（Ce-Zr-O2）x复合氧化物做载体负载CuO的催化剂,以及选择性催化氧化富氢气氛中CO催化活性和选择性.结果表明,助剂Ce掺杂的纳米Al2O3负载CuO对CO的氧化活性、选择性明显优于助剂K,g,n,r掺杂的催化剂.w（Ce）为20%,催化剂对CO的氧化活性最高.与浸渍法相比,助剂以沉积沉淀法加入催化剂具有更高的活性.CeO2在载体中的掺杂对提高CO的催化氧化活性和选择性起关键作用.（Ce-Zr-O2）x复合氧化物做戴体比单纯的纳米Al2O3有利于CO催化氧化选择性的提高.Cu-Ce二元复合氧化物作载体时,催化剂活性最高,CO的完全转化温度在105C.Cu-Zr复合氧化物作载体时,催化活性较差.降低CO氧化反应温度是提高富氢气氛中CO选择性氧化的关键.     

Fe2O3-MnO2-CuO-Co2O3体系红外辐射材料的微波合成与表征

采用微波合成法制备了Fe2O3-MnO2-CuO-Co2O3体系红外辐射材料, 测量了微波合成粉料的红外辐射性能, 运用XRD, IR, SEM和图像分析等测试方法研究了合成粉料的结构和颗粒形态. 结果表明, 采用微波加热在1000℃保温10min和在900℃保温30min, 均得到立方尖晶石结构的合成产物. 与常规固相合成法相比, 微波合成温度减低, 反应时间缩短. 合成粉料的颗粒细小均匀, 平均粒度分别为1.175μm和1.814μm. 微波合成粉料的红外辐射性能与采用常规固相合成法制备粉料的红外辐射率基本相当, 其法向全辐射率均达到0.84.     

Synthesis of flower-like CuO nanostructures via a simple hydrolysis route

We describe a facile route for the synthesis of flower-like CuO nanostructures by hydrolyzing of Cu(OAc)₂ solution without any surfactants. SEM and TEM observations indicate that the CuO products are composed of microspheres with diameters of 0.4-0.8 μm. The microspheres are in fact built from small needle-like nanocrystals with diameters of 10-15 nm. The method provides a convenient, low-cost, nontoxic route for the synthesis of nanostructures of oxide materials, and it is important for exploring oxide-based nanostructures for applications in nanodevices.