一维纳米氧化锌的制备及应用研究进展

本文对一维纳米氧化锌的制备方法进行了综述,包括气相法、液相法和模板法;重点讨论了一维纳米氧化锌在太阳能电池、传感器、多功能纺织品以及有机物光催化降解等方面的应用;指出了一维纳米氧化锌制备中存在的问题,并对其后续发展进行了展望.     

兰州城市规划展览馆关键施工技术研究

兰州城市规划展览馆工程主体采用大跨度型钢骨架,外墙采用现浇清水混凝土做法,造型凹凸有致、旁逸斜出,水平明缝条宽窄、深浅不一。通过对型钢混凝土骨架的构建、模板的设计、加工、使用及节点部位的处理、混凝土工程等方面的研究分析,总结出工程质量控制成功的关键因素,为同类工程的设计和施工提供了参考。     

Policy translation and configuration using dynamic template

To solve the problem of complex,cumbersome and error-prone configuration of security devices caused by the heterogeneous configuration modes in complex networks,a dynamic template-based scheme for translating and configuring policy was proposed.In detail,considering the code’s features,the code-based template for translating policies was constructed to configure the command line conversion,and the keyword comparison method was used to ensure the accuracy of policy configuration.Experiments show that the scalability and the accuracy of the proposed scheme.     

模板法制备介孔SiO2及其孔径调节研究进展

介孔材料具有独特的孔道结构、较大的比表面积、孔径可调、维度有序等特点，在光化学、生物模拟、催化、分离、功能材料等方面具有广阔的应用前景。基于此，本文对模板法制备介孔材料的最新研究进展、影响介孔材料孔径调节与形貌变化的主要因素，如模板剂的种类、有机助剂与反应条件等进行了归纳总结，并对其今后的发展趋势进行了展望。     

Co纳米线阵列的掠入射中子小角散射研究

本文采用掠入射中子小角散射（GISANS）技术，研究了沉积在多孔阳极氧化铝（AAO）模板中的Co磁性纳米线阵列的空间结构，利用计算机软件对GISANS实验进行了理论模拟，并与扫描电子显微镜（SEM）观察的结果进行比较。结果表明，GISANS实验结果、GISANS理论模拟结果和SEM实验结果三者相吻合。纳米线直径约为60 nm，纳米线中心平均距离约为121 nm，垂直于样品表面相互平行排列，在样品平面内呈现出二维局域六角有序排布。本工作证明了GISANS实验技术结合计算机理论模拟，是研究纳米线阵列及类似纳米体系的有力手段。     

中空微/纳米结构材料的制备及其在超级电容器领域的应用

对近年来中空微/纳米结构材料的制备方法及其在超级电容器领域的应用进行综述。介绍了中空微/纳米结构材料的制备方法,包括:硬模板法、软模板法和无模板法,概述了中空微/纳米结构材料在超级电容器领域的应用,总结了中空微/纳米结构材料在超级电容器领域应用中存在的一些不足。     

The potential of Kraft black liquor to produce bio-based emulsion-templated porous materials

Emulsion-templated porous monoliths based on castor oil-in-black liquor and on 1,2-dichloroethane-in-black liquor medium internal phase emulsions have been prepared in order to evaluate a possible valorisation of that undervalued by-product of the paper mill Kraft process. The cross-linking behaviour of the different polymers originally contained in the black liquor was investigated. It appears that both lignin and hemicellulose fragments are involved. Characterisation of the monoliths by scanning electronic microscopy and mercury intrusion porosimetry showed that using either castor oil or 1,2-dichloroethane allowed to obtain macrocellular morphology along with a high porosity. However, higher concentration of the internal phase is possible in emulsions prepared with 1,2-dichloroethane than with castor oil, leading to more attractive materials from both chemical and environmental aspects.     

纳米级CuO催化剂的制备及其糠醛加氢催化性能

采用溶液法制备纳米级Cu O催化剂,通过添加不同种类模板剂调控其微结构,利用SEM,XRD,BET方法对催化剂的形貌、结构、物相及比表面积进行表征。表征结果显示,当模板剂为两性离子表面活性剂时,可得到粒径小、比表面积大、分散良好的纯晶相纳米级Cu O催化剂。将该催化剂应用于糠醛加氢制2-甲基呋喃的反应,考察了反应温度、氢与糠醛摩尔比及糠醛液态空速对糠醛加氢反应性能的影响。实验结果表明,在压力0.03 MPa、温度230~240℃、氢与糠醛摩尔比10∶1、糠醛液态空速0.2 h-1的条件下,糠醛转化率为100%,2-甲基呋喃选择性约为95.2%。     

新型复合木方研制及现场应用研究

为了解决混凝土浇筑施工中用于模板支撑的木方容易出现折断、腐蚀,从而难以再次使用的问题,采用槽型铝合金和木方进行有机结合的方式,研制成功一种新型的复合木方。新型木方使用具有耐腐蚀性强、耐久性好、强度高、节约木材资源等一系列优点,具有广阔的市场前景和重要的现实意义。     

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

A new template‐free controlled method is reported herein to prepare the novel hollow carbon nanospheres with dual active sites of FeN₄ and FeC₃ by in situ growth reaction on graphene nanosheets, labeled as HCN‐FNFCG. As‐prepared HCN‐FNFCG nanomaterials possess hierarchically porous FeN₄/FeC₃ shells with structures of microporous, mesoporous, and macroporous properties. Moreover, the hierarchically porous HCN‐FNFCG nanomaterials with dual active sites of FeN₄ and FeC₃ have not been reported before. The HCN‐FNFCG nanomaterials, as oxygen reduction reaction (ORR) catalysts, are first studied systematically toward cathodic ORR of fuel cell. The measurements have illustrated that HCN‐FNFCG‐650 has the best ORR performances among these HCN‐FNFCG nanomaterials studied. The onset potential of HCN‐FNFCG‐650 has reached 1.095 V in alkaline electrolyte, and its maximum current density is 6.48 mA cm^?2. Additionally, the HCN‐FNFCG‐650 has also displayed small electrochemical impedance, its Tafel‐slope value is 44.25 mV dec^?1, much lower than that of the 20% Pt/C (69.57 mV dec^?1). And its value of current density is still maintained 92.83% of the initial value after 9000‐second continuous tests. High tolerance against methanol crossover is also exhibited for HCN‐FNFCG‐650. This novel method of template‐free synthesis can provide a promising strategy for preparing hollow nanospheres with hierarchically porous shells. And it can be used to design ORR electrocatalysts, electrode materials, or other applications.