Sonochemical synthesis and characterization of new seven coordinated zinc,cadmium and mercury nitrate complexes: New precursors for nanostructure metal oxides

The nitrate complexes of group 12 elements with a tridentate Schiff base ligand (L = (E)-N1-((E)-3- phenylallylidene)-N2-(2-((E)-((E)-3-phenylallylidene) amino)ethyl) ethane-1,2-diamine) were synthesized via sonochemical process and characterized by various physical and chemical methods. The structural analysis of the zinc nitrate complex by single crystal X-ray diffraction analysis shows that the central atom is seven-coordinated by three nitrogen atoms from the Schiff base ligand as well as four oxygen atoms from two different nitrate anions. The geometry around the metal center can be described as a distorted pentagonal bipyramid. The crystal packing analysis of zinc nitrate complex indicates that the intermolecular interactions related to nitrate groups plays the essential role in the orientation of supramolecular structure. Hirshfeld surfaces (HS) and their corresponding fingerprint plots (FP) have been also used for further investigation of crystal structure of zinc nitrate complex. Furthermore thermal analyses (TG/DTG) of three nanostructure complexes were carried out and discussed. Finally, direct thermolysis of zinc and cadmium nitrate complexes in air atmosphere led to the production of zinc and cadmium oxide nanoparticles.     

直接置换法制备包覆型纳米铜-银双金属粉末

 以AgNO₃为主盐，采用直接置换法初步制备了包覆型纳米铜-银双金属粉末，分析了工艺条件对包覆效果的影响，并用透射电子显微镜、X射线能量色散谱仪和X射线衍射仪进行了表征。实验结果表明：纳米铜-银双金属粉末为包覆型结构，平均粒径约70 nm，分散性较好，表面银的原子分数达到74.28%。在洗涤过程中加入一定量的保护剂，有效解决了纳米铜粉的氧化问题。     

高温燃煤钙基纳米金属氧化物复合吸附剂同时除砷脱硫研究

将纳米MgO、Al2O3和ZnO分别添加于超细CaCO3中制备出钙基纳米金属氧化物复合吸附剂,并进行燃煤过程中除砷脱硫的试验研究。结果表明,在Ca/S摩尔比为1.8,燃烧温度为1200℃,纳米金属氧化物的添加量为超细CaCO3质量的8%时,添加了纳米MgO的复合吸附剂除砷脱硫性能最好,比单一的超细CaCO3除砷率和脱硫率分别高出了28.73%和37.21%,表现出同时除砷脱硫的良好性能。     

微波等离子体技术在ICF制靶中的应用

 为了提高ICF精密制靶的质量，提出用微波等离子体（MP）技术，包括等离子体薄膜制备、等离子体反应性离子束刻蚀、聚焦离子束刻蚀、掺杂纳米金属粉末制备和掺杂纳米金属粉末的表面包覆改性等技术，去加以改进和解决。此方法与其它成膜技术相结合，在ICF精密制靶中得到广泛应用。     

气相色谱法研究胶体金负载纳米金属氧化物催化氧化CO行为

将胶体金负载于不同的金属氧化物纳米材料上,分别制备了Au/TiO2、Au/γ-Al2O3、Au/Fe2O3和Au/ZnO纳米材料,采用透射电子显微镜(TEM)对负载前后的材料进行了表征。利用气相色谱法检测CO的浓度,在选定的色谱条件下,5 min内就实现了快速分离测定,该检测方法的线性范围为1.0×10-6%~10%(体积分数),回收率为96.0%~103.6%,精密度为1.2%~2.3%。应用自制的催化活性评价装置对氧化物纳米材料催化氧化CO的行为进行了研究,结果表明:负载金氧化物纳米材料催化氧化CO的性能在50~200℃均优于相应的未负载金的材料,其中Au/TiO2的催化氧化效果最佳,且在一定气体流速范围内具有稳定的催化活性。