四种金属离子亲和层析纯化重组戊型肝炎病毒包涵体的效果比较

目的 选择固相金属亲和层析柱的金属离子,以优化分离纯化重组戊型肝炎病毒包涵体的条件。方法 在同一试验条件下用4种金属离子柱分离纯化目的蛋白。结果 包涵体经不同离子柱层析时目的蛋白的收获率、纯度、洗脱条件各异。结论 镍离子柱纯化效果最佳。     

矿浆中金属离子对硅线石与石英浮选分离的影响

系统研究了Fe^3 和Al^3 等金属离子对硅线石和石英可浮性的影响，结果表明：采用油酸钠为捕收剂，Fe^3 和Al^3 在中性或弱碱性介质中对石英浮选有很强活化作用，从而使硅线石和石英浮选分离困难，柠檬酸对金属离子活化石英有很强抑制作用，而对硅线石抑制作用较弱，是浮选分离硅线石和石英较好的的选择性抑制剂，Auger电子能谱仪测试表明：柠檬酸在硅线石表面作用前后Al峰的化学位移为-0.1eV，化学作用很弱，而在Fe^3 和Al^3 离子活化的石英表面，加入柠檬酸前有明显Al Auger电子能峰，加入后，石英表面Al Auger电子能峰消失，表明柠檬酸加入促使吸附在石英表面Al^3 离子溶解，使石英表面阴离子捕收剂吸附活性点降低。     

缩合型室温硫化硅橡胶的配合剂(二)

介绍了缩合型室温硫化硅橡胶中常用的催化剂（如有机锡类、钛酸酯及其螯合物、有机酸的金属盐等）的特点和作用。     

新型后过渡金属烯烃催化剂的研究进展

综述了近年来－系列新型α－二亚胺型后过渡金属（Ni、Pd、Fe、Co）催化剂在烯烃聚合、极性单体共聚、烯烃齐聚、环烯烃加成聚合、烯烃活性聚合和聚烯烃纳米复合物等方面的最新进展。系统地阐述了不同的中心过渡金属离子、α－二亚胺骨架、骨架上的取代基和不同的聚合条件（温度、压力）分别对催化剂的聚合活性、聚烯烃支化率、聚合物分子量和分子量分布以及聚合产物的性质等影响，并且简要说明了这一类催化剂的制备方法和新特点。     

HKUST-1@APP环氧树脂阻燃复合材料的合成与性能

使用溶剂热法将HKUST-1〔Cu3(BTC)2, BTC为1,3,5-苯三甲酸〕负载到聚磷酸铵（APP）的表面制得HKUST-1@APP,然后将不同量的HKUST-1@APP与环氧树脂（EP）混合后固化制备HKUST-1@APP / EP阻燃复合材料。通过水平垂直燃烧测定仪、氧指数测定仪、电子拉力机等对EP复合材料进行了阻燃和力学性能分析。结果表明,当HKUST-1@APP的添加量为总体系的5%时,复合材料EAC-5的极限氧指数为27.5 %,垂直燃烧测试（UL-94）通过V-1级。添加HKUST-1@APP后,样品残炭的AD/AG(拉曼光谱中无定形碳的碳原子与晶体碳中SP2杂化的碳原子振动分别形成的D峰与G峰的峰面积比)降低到0.043,而添加总质量5%APP的EA-5的AD/AG为0.3161,说明HKUST-1@APP还可以改善环氧树脂燃烧过程中产生的炭层,使炭层更连续、石墨化程度更高。     

Ultra wideband NIR emission in all-inorganic lead-free metal halides through Sb3+ doping

In recent years, food detection, plant photosynthesis, night vision, and the identification of biological data have all benefited from near-infrared luminescence. However, developing metal halides emitting near-infrared (NIR) light is still difficult, which restricts further applicability. Here, we propose an insightful methodology to investigate the wideband NIR emission in metal halide Cs₂ZnCl₄ host by doping Sb³⁺. The phosphors are successfully synthesized by the coprecipitation method and the photoluminescent properties are explored in detail. Based on the spectroscopic information, experimental data with DFT calculations, and luminescence kinetics investigation of Sb³⁺ doped Cs₂ZnCl₄, the broadband red emission is caused by self-trapped excitons, which can be attributed to the ³P₁–¹S₀ transitions. The spectra under the excitation at 351 nm exhibit an ultra-wideband emission with a center wavelength of 737 nm, an FHWM of 196 nm, and a significant Stokes shift of 386 nm. The NIR LED fabricated by Cs₂ZnCl₄: Sb³⁺ can also be used in night vision devices and biological identification. Our findings in Sb³⁺ doped Cs₂ZnCl₄ materials provide light on how doping induces emission centers and expand our understanding of the optical characteristics of doped lead-free metal halides for future research. This work also offers recommendations for broadening the range of uses for luminous metal halides and proposes an efficient method for developing fresh environmentally friendly and wideband emission NIR phosphors.     

Achieving environment-friendly spherical polycrystalline diamond magnetic abrasives via plasma molten metal powders bonding with hard materials

High performance magnetic abrasive particles (MAPs)can contribute to the promotion of magnetic abrasive finishing (MAF) industry. In this work, environmentally friendly spherical polycrystalline diamond magnetic abrasive particles (PCD-MAPs) were prepared by plasma molten metal powders bonding with hard materials. The effects of inlet mode, outlet angle and powder concentration on the erosion wear of the spray tray were first investigated, followed by the effect of PCD powder concentration on the preparation of MAPs, and finally the microscopic morphology, phase composition, particle size distribution, magnetic properties and finishing performance of the MAPs were characterised and analyzed. The results revealed that: the erosion wear of the spray tray was smaller for the opposing inlet type with an outlet angle of 65°; the PCD-MAPs were regular spherical; the cutting edge of PCD was not carbonized and mechanically bonded to the surface layer of iron powder tightly and uniformly; the concentration of PCD powder affected the bonding number on the surface of iron powder particles; the proportion of particle size distribution between 160–212 μm and the saturation magnetic induction intensity decrease with increasing PCD concentration; the recovered PCD powder can still be used; the Ra value of TC4 titanium alloy decreases from 0.386 μm to 0.096 μm within 25 min, and the service life of PCD-MAPs exceeds 60 min. This study can provide technical support for the bonding of PCD/metal composites.     

Accelerated sintering of PtRh/Al2O3 catalysts in an oxygen periodic pulse flow

PtRh catalysts were prepared by coimpregnation, with chlorine-free precursors of a -alumina. They were sintered at 973 K under a continuous flow of O₂ (1% in Ar or air) or of a flow of Ar into which pulses of O₂ were injected periodically. Under the latter conditions the sintering was significantly accelerated, particularly for a certain value of the period of O₂ pulses.     

含氮化合物废气选择性催化氧化技术研究进展

通过对当前含氮化合物废气治理技术的对比分析,总结选择性催化氧化的相关技术优势。根据对含氮化合物的种类及来源分析,介绍氨气、腈类、胺类及其他含氮化合物的催化净化技术。重点总结催化剂的种类、研发进展和在实际使用中可能遇到的问题,同时展望含氮化合物废气选择性催化氧化技术的研发方向。     

用铜物理显影的多级放大成像过程——Ⅱ.获得能导电的影像

前文中我们报道了利用铜物理显影的多级放大成像过程能够明显地提高影像密度,从而大大提高了感光材料的感光度或者大幅度地降低感光材料的用银量,并且可以达到特高反差和特短趾部等特殊效果。本文介绍铜物理显影多级放大成像过程的另一种应用:在乳剂层表面或绝缘材料表面上定域沉积能导电的铜影像,为将感光胶片直接用于