金属钝化剂的研究进展

塑料和聚烯烃材料爆露在空气中被氧化降解使之失去使用价值。该问题可通过添加稳定剂解决。但是当材料与金接触时，某些金属离子或金属可加速氧化反应，这会明显降低制品的使用寿命。这时应加入金属离子钝化剂，以降低聚合物的降解。本文综述了该类产品的合成与应用，还介绍了一些工业化的品种。     

Influence of the Design of Metal Receivers of Slab Continuous-Casting Machines on the Motion of Flow in the Tundish in the Case of Deviations of the Metal Stream from the Required Position. Part III. Results of Investigations

Refractories and Industrial Ceramics - We study the problem of evaluation of the influence of design of the metal receiver of a large-capacity tundish of slab continuous-casting machine on the...     

金属醇盐的合成(Ⅰ)

简要介绍了金属醇盐合成的发展概况，单金属醇盐和多金属（双金属、三金属及四金属）醇盐等的合成方法。     

贵金属分析方法新进展

综述了贵金属的分析方法研究进展,对贵金属分析方法的发展动向提出了建议和展望。     

Integrating the Fields of Catalysis: Active Site Engineering in Metal Cluster,Metal Organic Framework and Metal Single Site

Topics in Catalysis - Research evolved using nanoparticles synthesized and characterized under reaction conditions opened the door to study all three fields of catalysis: heterogeneous, homogenous,...     

金属醇盐的合成(Ⅱ)

简要介绍了金属醇盐合成的发展概况，单金属醇盐和多金属（双金属、三金属及四金属）醇盐等的合成分法。     

Influence of the Design of Metal Receivers of Slab Continuous-Casting Machines on the Motion of Flow in the Tundish in the Case of Deviations of the Metal Stream from the Required Position. Part I. Statement of the Problem

Refractories and Industrial Ceramics - We study the problem of evaluation of the influence of design of the metal receiver of a large-capacity tundish of slab continuous-casting machine on the...     

Resacetophenone-formaldehyde resins,I. Metal chelates

Synthesis and properties of a resacetophenone-formaldehyde resin are described. The number average molecular weight of the resin determined by vapour pressure osmometry and nonaqueous conductometric titration is 2500 and 2200 g/mol, respectively. Cu(II), Ni(II) and Co(II) chelates of the resin were prepared. The elemental analysis of chelates indicated a metal to ligand ratio 1:2. From the diffuse reflectance spectra of the chelates it could be concluded that Ni(II) and Co(II) chelates have a tetrahedral structure while Cu(II) chelate has a square planar structure. Infrared spectral studies showed that the metals are co-ordinated through the oxygen of the carbonyl and phenolic groups. The presence of methylene bridges was also indicated from IR spectral studies. The thermal properties of the resin and its metal chelates are discussed.     

Preparation of Functionalized Organometallic Metal–Metal Bonded Dimers Used in the Synthesis of Photodegradable Polymers

This review describes the synthesis of functional dimeric metal carbonyl complexes and their subsequent polymerization to afford polymers containing metal–metal bonds in the main chain. Such polymers are photodegradable because the metal–metal bonds are cleavable by visible light. The functionalization of the dimeric complexes and their polymerization is challenging due to the reactivity of the M–M bond, and therefore many standard synthesis and polymerization methods cannot be used. Various polymerization methods are discussed including ring-opening metathesis polymerization, acyclic diene metathesis polymerization, ring-opening polymerization, traditional step polymerization, and copper-catalyzed step polymerization using click chemistry.     

Metal/Fluorocarbon Pyrolants: V. Theoretical Evaluation of the Combustion Performance of Metal/Fluorocarbon Pyrolants based on Strained Fluorocarbons

The potential of strained fluorocarbons, which can act as oxidizers in metal‐based pyrolant systems, is investigated. The oxidizing performance of fluorocarbons is evaluated by the enthalpy of combustion Δ_cH(298K) and the fractional electron transfer ΔN. Δ_cH(298K) can be related to hybridisation, molar C/F ratio and strain of the parent carbon skeleton of the fluorocarbon. Considered fluorocarbons are tetrafluorotetrahedrane (CF)₄ ( 3 ), tetrakis(trifluoromethyl)tetrahedrane C₄(CF₃)₄ ( 4 ), hexafluoro[3]prismane (CF)₆ ( 5 ), hexakis(trifluoromethyl)[3]prismane C₆(CF₃)₆ ( 6 ), octafluorocubane (CF)₈ ( 7 ), octakis(trifluoromethyl)cubane C₈(CF₃)₈ ( 8 ), eicosafluorododecahedrane (CF)₂₀ ( 9 ), eicosakis(trifluoromethyl)dodecahedrane C₂₀(CF₃)₂₀ ( 10 ), C₆₀F₄₈ ( 11 ) and perfluorofullerane (CF)₆₀ ( 12 ). Powerful oxidisers in terms of exothermicity are those possessing both tertiary C F‐units and strained carbon skeletons. Nevertheless the reactivity, which is estimated on basis of ΔN, the fraction of electrons transferred according to Pearson, has been found to be high with the corresponding perfluoromethyl derivatives and maximum with the fluorofulleranes. For part IV see Ref. 17.     

Metal electrons in the double layer theory

The role of metal electrons in the response of the metal—electrolyte interface to charging is discussed in view of recent density-functional and phenomenological theories. The emphasis is given to the predicted capacity—charge plots and electromodulated optical signals.     

High-Performance Directional Metallopolyamides. II. Optical Spectroscopic Studies of Metal Chelation

The chelating interaction between metal ions and 4,4-disubstituted-2,2-bipyridyl-containing high-performance polymeric ligands prepared from 2,2-bipyridyl-4,4-dicarboxylic acid and a series of primary aromatic diamines was investigated by optical spectroscopy. Optical spectroscopic studies of the chelation of ruthenium ions by the 2,2-bipyridyl-containing polyamides revealed the formation of distinct ruthenium(II) complexes [Ru^II(poly)L₄] ( _max=530 nm), [Ru^II(poly)₂L₂] ( _max=584 nm), and [Ru^II(poly)₃]²⁺ ( _max=476 nm), while iron(II) ions formed only one complex ( _max=569 nm). The diverse functional features of the polymer repeat unit directly influences the chelation of metal ions.     

金属有机骨架材料对水中重金属的吸附性能

金属有机骨架材料(MOFs)是近些年来研究较多的一种新型多孔材料,具有超高表面积、孔径可调节等优点,被广泛应用于水中污染物的去除.对MOFs材料进行官能团修饰或与其它材料进行复合后,可提高材料的吸附性能和选择性,展现出更为优异的效果.本文综述了常见的几种MOFs材料对水中重金属的吸附性能,并为今后的研究方向提出几点展望...     

52919离子色谱法测定烟叶中的过渡金属和重金属

采用非抑制型离子色谱法、阳离子交换柱、电导检测器,以柠檬酸-苹果酸-乙二胺为淋洗液,同时测定Ag 、Cu2 、Cd2 、Zn2 、Pb2 五种离子.研究了淋洗液配比及淋洗液pH对分离效果的影响,选择了最佳分离条件,得出五种离子的工作曲线方程,相关系数为0.989～0.999,检出限为0.02～0.1 μg/mL,RSD为1.64%～4.03%,样品加标回收率为98%～104%.本方法用于烟叶样品的分析,具有简便、快速、检出限低,灵敏度高,准确度高、选择性好的特点.     

扩散焊接异种金属及陶瓷/金属的研究进展

扩散焊接作为一种新颖的焊接技术之一,在异种材料的连接领域得到了广泛应用.本文在综述扩散焊接原理和特点的基础上,着重介绍了扩散焊接在异种金属、陶瓷/金属异种材料连接中的应用及研究现状.     

纳米金属氧化物吸附金属离子的研究现状

纳米材料由于具有较大的比表面积及许多未饱和的原子,对金属离子具有很强的吸附性,纳米金属氧化物由于价格低廉、容易合成,近年来,在研究其对金属离子吸附方面受到关注。对纳米金属氧化物吸附金属离子的机理、影响因素、及应用进行了综述,提出了目前纳米金属氧化物在吸附金属离子方面存在的问题以及对其发展前景进行了展望。     

Metal Particle Size Determination of Supported Metal Catalysts

The variety of supported metal catalysts utilized in the operations of the petroleum and chemical industries emphasizes the importance of metal-catalyzed reactions. As a result, many scientific investigators have attempted to characterize and follow closely the changes in the crystallite size and shape of supported metal particles in commercial and simulated environments. From these efforts a massive production of experimental facts has emerged.