The Paramagnetic 2D Chiral—porous Polymer of L—Phenylalanine and Manganese

1 INTRODUCTION Assemblies of chiral and helical structures are common in biology. Molecular materials with chiral porous structures and helical morphology have attracted a great deal of attention in multidiscipli- nary areas such as zeolite-like coordination poly- mers, biomaterials, and chiral chemistry[1～3]. The intensive interest in these materials arises, to a large extent, from their interesting properties and poten- tials in various applications such as electrical con- ductivity, …     

Synthesis, Properties and Crystal Structure of a Novel Coordinated Polymer:{(H_2en)(H_3O)[(BiPb(C_2O_4)_4(H_2O)_2)]·2(H_2O)}_n

1 INTRODUCTION It is well-known that bismuth and lead display attractive properties as promoting elements in noble metal-based catalysts[1], and thermal decomposition of ammonium metal oxalates can yield crystalline porous materials with a high surface area. This feature makes them attractive as precursors for catalysts and other nanocrystalline oxides[2]. Because of their topology, the oxalates themselves also possess inte- resting properties such as the capability of ion-exchange. The …     

配合物[Mn(2,2′-bipy)(H_2O)_4]·(m-phth)的水热合成和晶体结构(英文)

0IntroductionAs the active sites of several mononuclear en-zymes are five-or six-coordinate manganese speciescontaining coordinated carboxylate groups,water andnitrogen-donor molecules research on the coordinationcompounds of manganese with such coligands hasgrown[1,2].There has been extensive interest in man-ganese chemistry due to the involvement of manganesein many biosystems and magnetic materials[3￣5].Theisophthalate as a potential bidentate ligand seemsquite suitable for self-assembly s…     

一维链状配位聚合物[Cd(N-MeIM)_2(SCN)_2]_n的结构表征和电化学性能研究(英文)

0 IntroductionThe rapid development in the area of polymericmetalorganic frameworks (MOFs) continues to producevarious structures with interesting compositions andtopologies[1￣5] , along with potential applications asfunctional solid materials for molecular selection, ionexchange, and catalysis[6￣10]. By the careful selectionand design of organic ligands, such as linear isothio-cyanate-based building blocks, a wide variety of solid-state supramolecular architectures have been con-structed[1…     

Synthesis and Characteristics of a New Molybdoantimonate KSbMoO_5

1 INTRODUCTION Great efforts have been made for the discovery of microporous solids due to their rich structural chemi- stry and wide applications in some commercial pur- poses as ion exchanger, absorbent, and catalyst[1]. Since many properties of porous materials depend on their composition and architecture, recent attention has been paid to incorporating other main group and tra- nsition metals into open frameworks, and plenty of materials are reported to contain polyhedra, such as [X…     

A Novel 3D Supramolecular Network Constructed from [Cu(4,4'-bipyridine)(O_2CMe)_2]_2 Molecular Ladders by Hydrogen Bonding

1 INTRODUCTION In recent years, the assembly of extended supra- molecular architectures from molecular building units has yielded a new generation of materials with diverse network topologies[1～3]. A number of such frameworks have been found to exhibit fascinating physical and chemical properties. The investigation of hydrogen bonding is important for many practical applications, such as the design of antibiotics and development of new materials with programmed properties[4]. A great va…     

Functional porous carbon-based composite electrode materials for lithium secondary batteries

The synthetic routes of porous carbons and the applications of the functional porous carbon-based composite electrode materials for lithium secondary batteries are reviewed. The synthetic methods have made great breakthroughs to control the pore size and volume, wall thickness, surface area, and connectivity of porous carbons, which result in the development of functional porous carbon-based composite electrode materials. The effects of porous carbons on the electrochemical properties are further discussed. The porous carbons as ideal matrixes to incorporate active materials make a great improvement on the electrochemical properties because of high surface area and pore volume, excellent electronic conductivity, and strong adsorption capacity. Large numbers of the composite electrode materials have been used for the devices of electrochemical energy conversion and storage, such as lithium-ion batteries (LIBs), Li-S batteries, and Li-O2 batteries. It is believed that functional porous carbon-based composite electrode materials will continuously contribute to the field of lithium secondary batteries.     

一种具有一维链状结构的4f-3d双核配合物[Eu(DMSO)3(H2O)3Cr(CN)6]·H2O(DMSO=二甲亚砜)的合成、晶体结构和磁性研究

0 IntroductionIn the last decade, cyano-bridged prussian blueanalogues[1￣12] have been intensively studied from theviewpoint of use as functionalized molecule-basedmagnets[13￣18]. For typical magnetic materials such asmetal alloys and metal oxides, rare…     

Synthesis and Crystal Structure of a Two-dimensional Silver Framework Constructed by H2idc (H2idc = Iminodiacetic Acid)

1 INTRODUCTION Self-assembly supramolecular architectures are currently of great interest due to their intriguing net- work topologies and potential applications in micro- electronics, nonlinear optics, porous materials, and other applications[1]. However, the rational design of these materials is complicated because of the un- certain coordination propensity of metal ion, which is influenced by factors such as counter ion, solvent and ligand geometry[2]. Proper selection of metal ions an…     

新型多孔催化材料专栏前言（英文）

正Over the last 15-20 years a wide range of new porous catalytic materials has been discovered in the wake of major developments in mesostructured materials and hybrid porous solids such as metal organic frameworks(MOFs).These two developments have both enormous potential to produce catalyst supports and solids.It may be argued that most existing industrial catalysts may be revisited for improvement taking advantage of the novel materials.In both cases new techniques     

Cationic membranes for phenols production

Ionic Substitution by Electrodialysis is a good alternative to the industrial conversion of sodium salts of phenols into undissociated phenols, conventionally performed through acidification by strong acids. The acidification through electromembranes combines the possibility to achieve high conversion values with the advantage of keeping the process stream separated from the acid stream. The process is performed through cationic membranes; conversion can be obtained also in the absence of electric current, even if slightly better performances can be achieved by applying an electric field. Process feasibility as well as membrane resistance is tested, for the case of model solutions reproducing the main features of the real process streams. Maximum conversion and process rate are greatly affected by the ratio between protons in the acid solution and sodium ions in the process solution. Phenol losses into the acid stream and chloride contamination of the process stream can be reduced by working with diluted process and acid streams.     

Micronization of tolbutamide using rapid expansion of supercritical solution with solid co-solvent (RESS-SC) process

Micronization of a sulfonylurea antidiabetic agent, tolbutamide, using rapid expansion of supercritical solution with solid co-solvent (RESS-SC) process was investigated in this study. Menthol was selected as the solid co-solvent in the RESS-SC process owing to its high vapor pressure and ease of removal by sublimation. The tolbutamide particles were micronized successfully from its original mean size of 89.4 ??m to the smallest mean size of 2.1 ??m through the RESS-SC process. The use of solid co-solvent in this process enhanced the saturated solubility of tolbutamide in supercritical carbon dioxide and inhibited the particle growth during pressure expansion after the nozzle. In addition, polymorph conversion from form I to form II after the RESS-SC process was confirmed by XRD and DSC analyses. Measurements of the dissolution rate profiles before and after the RESS-SC process were also investigated. It is shown that the micronized tolbutamide by the RESS-SC process had novelty in dissolution behavior compared to that of the original compound. Its dissolution rate was enhanced by 8.8 times after the RESS-SC process.     

Film‐formation property of vinylidene chloride‐methyl methacrylate copolymer latex. I. Effect of emulsion‐polymerization process

Changes in minimum film‐formation temperature (MFFT) during storage of latexes prepared from 91:9 wt % vinylidene chloride (VDC)‐methyl methacrylate (MMA) monomer mixture by seeded batch and seeded semicontinuous emulsion polymerization were investigated, with attention centered on polymer‐crystallization behavior during storage in the dispersed state. MFFT of latex prepared by the seeded batch process rose to 47 °C, whereas that of latex prepared by seeded semicontinuous process remained below 14 °C with storage at 20 °C for 12 weeks. Infrared absorption of latexes in the dispersed state and wide‐angle X‐ray diffraction of powder polymers obtained by lyophilization of fresh and stored latexes both indicated a much greater increase in polymer crystallinity during storage with latex prepared by the seeded batch process than with that prepared by the seeded semicontinuous process. Analysis of the copolymer composition drift calculated from reactivity ratios and ¹H NMR analysis indicated a wider sequence distribution and longer VDC sequences in polymer prepared by the seeded batch process than in polymer prepared by the seeded semicontinuous process. This explained the higher rate of crystallization during storage with latex prepared by the seeded batch process than with that prepared by the seeded semicontinuous process. Rising crystallinity during storage in the dispersed state is believed to have caused the MFFT rise. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 939–947, 2002     

Monitoring of an industrial process by multivariate control charts based on principal component analysis

The control and monitoring of an industrial process is performed in this paper by the multivariate control charts. The process analysed consists of the bottling of the entire production of 1999 of the sparkling wine "Asti Spumante". This process is characterised by a great number of variables that can be treated with multivariate techniques. The monitoring of the process performed with classical Shewhart charts is very dangerous because they do not take into account the presence of functional relationships between the variables. The industrial process was firstly analysed by multivariate control charts based on Principal Component Analysis. This approach allowed the identification of problems in the process and of their causes. Successively, the SMART Charts (Simultaneous Scores Monitoring And Residual Tracking) were built in order to study the process in its whole. In spite of the successful identification of the presence of problems in the monitored process, the Smart chart did not allow an easy identification of the special causes of variation which casued the problems themselves.     

Production of oxy-rich air by RPSA for combustion use

The capital and energy costs of production of oxygen enriched air by a rapid pressure swing adsorption (RPSA) process can be reduced by decoupling the air drying and the air separation duties of the process. Integration of the oxygen-RPSA process with an enhanced combustion application system allows thermal swing adsorption drying of air feed to the RPSA process. The air separation process then can be run using an ad(de)sorption pressure envelope of 2:1 atmospheres, which significantly reduces the cost and energy of operation of the air compressor.     

改进层次分析法在污水处理工艺选择中的应用

采用传统的层次分析方法(Analytic Hierarchy Process,AHP)进行污水生化处理工艺的选择时,其科学性和可操作性均较低,而改进的AHP法采取三标度法,判定矩阵较易构造,且无需进行一致性检验。本研究采用改进的AHP法,建立了4层10指标4方案的污水处理工艺综合评价体系,分别对MBR、A~2/O、A/O和氧化沟工艺的经济效益、环境影响及技术性能进行分析。结果表明,MBR、A~2/O、A/O和氧化沟工艺的评价体系公式计算结果分别为0.3137、0.3379、0.2085和0.1552。因此,在我国东北地区,综合考虑经济效益、环境影响及技术性能,A~2/O工艺为最适宜的生化处理工艺,其次是MBR工艺和A/O工艺,而氧化沟工艺为最不推荐的工艺。改进的AHP法可对现有污水处理工艺的经济效益、环境影响及技术性能进行直观的评价,从而为现有工艺的运行管理以及新工艺的设计提供理论及实践依据。     

Batch process monitoring using on-line MIR spectroscopy

Many high quality products are produced in a batch wise manner. One of the characteristics of a batch process is the recipe driven nature. By repeating the recipe in an identical manner a desired end-product is obtained. However, in spite of repeating the recipe in an identical manner, process differences occur. These differences can be caused by a change of feed stock supplier or impurities in the process. Because of this, differences might occur in the end-product quality or unsafe process situations arise. Therefore, the need to monitor an industrial batch process exists. An industrial process is usually monitored by process measurements such as pressures and temperatures. Nowadays, due to technical developments, spectroscopy is more and more used for process monitoring. Spectroscopic measurements have the advantage of giving a direct chemical insight in the process. Multivariate statistical process control (MSPC) is a statistical way of monitoring the behaviour of a process. Combining spectroscopic measurements with MSPC will notice process perturbations or process deviations from normal operating conditions in a very simple manner. In the following an application is given of batch process monitoring. It is shown how a calibration model is developed and used with the principles of MSPC. Statistical control charts are developed and used to detect batches with a process upset.     

Material- und Signalfluß

An industrial production process is considered to be divided into a working process and an information process. Starting point for the information process is the sampling of a material flow. The meaning of “representative” samples as well as questions of continuous and non-continuous sampling methods are discussed. The signals coming out of analysis are arranged in a special way according to statistical methods. Thereafter the information content is calculated by using rules of the information theory. The transmission of the information content within a certain time results in an information flux. The information flux actually required by the working process is compared to the information flux provided by analysis; and both are put into an equilibrium followed by considerations on “necessary and sufficient” analytical actions. It is the aim of analytical information processes to reduce the entropy of the working process to a minimum.     

基于DOE实验设计方法的聚丙烯焊接工艺优化

采用DOE实验设计方法,对聚丙烯(PP)材料焊接工艺进行了研究,确定了影响PP材料焊接强度的关键因素是气压夹紧力、焊接功率和样品厚度。通过全因子正交试验,对焊接强度和焊接工艺参数进行量化分析,通过优化器结果确定对共聚PP(牌号M60RHC)为原材料,样品厚度为2 mm,控制气压夹紧力为0.3 MPa,焊接功率控制在40 W,得到PP材料的最佳焊接工艺,降低了实验的次数,在该最大工艺条件下,焊接强度达到19.475 MPa。这将有助于其他原材料体系进行高效激光焊接工艺的筛选。     

SAPO-34分子筛晶化过程的研究

采用XRD、SEM、ICP-AES和MAS NMR等手段系统地研究了SAPO-34分子筛在常规水热合成过程和干胶液相转化过程中的组成和骨架结构的变化.结果表明,常规水热合成法在制备SAPO-34分子筛过程中,硅溶胶缩聚和解聚速率快,活性硅物种数量较少,产品易出现杂晶;采用干胶液相转化法,固体硅源解聚速率较慢,活性硅物种数量逐步增加,SAPO-34分子筛成核和成长的速率得到了控制,抑制了杂晶相的生成,SAPO-34分子筛结晶度逐渐增加.