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Progress in Chemistry 2003, No.05 Previous issue Next issue

In this issue:

Review
A Brief Review on the Study of Hydrogen Storage in Terms of Carbon Nanotubes
Zhou Yaping,Feng Kui,Sun Yan,Zhou Li**
2003, 15 (05): 345- |
Published: 24 September 2003
Abstract
Carbon nanotubes have attracted the attention of the whole world past years since it was once claimed to be the exclusive candidate carrier of hydrogen for the hydrogen vehicle. However, The reports on hydrogen uptake of the materials are quite controversial. In this review, the results of experiments as well as simulation studies were briefly reviewed, and the possibility of hydrogen storage relying on carbon nanotubes was discussed.
The Progress of QSAR/QSPR for Surfactants
Zhang Xiaoyi**,Zhu Huaiwu,Li Li,Li Ganzuo,Wang Zhengwu
2003, 15 (05): 351- |
Published: 24 September 2003
Abstract
The recent progress in QSAR/QSPR studies of surfactants and the applications of various structure descriptors has been reviewed. A quantitative structure-property relationship studie on the critical micelle concentration(cmc) of surfactants and the surface tension with charged partial surface area (CPSA)descriptors has been introduced. The charge distribution in ionic surfactants by quantum-chemical calculation and the structure-property of the colloid, which influences properties of surfactant, has also been introduced. The trend of QSAR/QSPR studies on some other properties of surfactants has been discussed.
Progress in Generation of Fine Particles Using Supercriticai Fluid Precipitation
He Wenzhi**1,2,Jiang Zhaohua1,Suo Quanling2
2003, 15 (05): 361- |
Published: 24 September 2003
Abstract
Supercritical fluid precipitation (SFP) technologies, such as RESS and SAS, are novel micronization processes having promising applications in various fields such as inorganic chemistry, organic chemistry and Pharmaceuticals. RESS consists of saturating a supercritical fluid (SF) with the substrate (s), then depressurizing the solution through a nozzle into a low-pressure chamber to cause an extremely rapid nucleation of the substrate (s) in the form of very small particles. SAS consists of decreasing the solvent powder of a liquid solvent in which the substrate is dissolved by saturating it with a SF, resulting in the substrate precipitation or recrystallization. Based on RESS and SAS, some improved SFP technologies, such as AESE, SEDS and SAS-EM have been developed to obtain smaller particles. AESE process involves spraying the solution through a nozzle as fine droplets into SF anti-solvent. SEDS, an improvement of ASES, consists of using a nozzle with two coaxial passages to achieve smaller droplets and intense mixing of SF and solution for increased transfer rates. SAS-EM, a modification of SAS, depends on deflecting the solution jet by a surface vibrating at an ultrasonic frequency that atomizes the jet into small micro droplets. A sintered porous plate or 'frit' nozzle, which could be manufactured more easily and was unlikely to be plugged due to blockage by the presence of a single particle in comparison with capillary nozzles, was used in RESS process. Specialized nozzles are used in AESE to generate and focus the preferred high frequency sonic waves that have been shown to maximize the production of extremely small droplets in the precipitation zone, leading to the precipitation of the very small particles. In this review, the concepts, characteristics and the related application of the SFP processes are introduced, and current issues relating to the SFP processes are addressed.
Progress in DNA-based Molecular Assemblies
Chen Xiaodong,Jiang Siguang,Liu Minghua**
2003, 15 (05): 367- |
Published: 24 September 2003
Abstract
The DNA-based molecular assemblies have shown prospective in gene therapy, electron transfer, molecular devices and nanomaterials fabrication. The progress in DNA based molecular organized assemblies has been reviewed in this paper.
Preparation of Titanium Nitride by Chemical Vapor Deposition
Wang Shutao,Zhang Zude*
2003, 15 (05): 374- |
Published: 24 September 2003
Abstract
Based on the preparation of titanium nitride, the effects for the choice of the precursor on the CVD systems have been illustrated. The advances of chemical vapor deposition in the field of material preparation were reviewed.
Studies on Morphological Structure and Photoactivity of TiO2 Heterogeneous Photocatalysts
Tang Yuzhao1,2,Li Wei**1,Hu Chun1,Wang Yizhong1
2003, 15 (05): 379- |
Published: 24 September 2003
Abstract
The mechanisms of photocatalysis reaction and photoactivity of the TiO2catalyst were introduced in this paper. Morphological structures of TiO2 such as crystal structure, particle size, surface area and surface state properties which influence photoactivity of the catalyst have been discussed.
Advances in Gold Catalysts and Their Application in Organic Reactions
Ma Yuchun,Shi Feng,Deng Youquan**
2003, 15 (05): 385- |
Published: 24 September 2003
Abstract
Although the study was much later than that of other noble metal catalysts, gold catalysts have received extensively attentions because of the special physical and chemical characters. The research and applications of gold catalysts in heterogeneous and homogeneous catalysis,such as selective oxidation, selective hydrogenation, asymmetric aldol reaction, C-N bond forming reactions) etc. , were reviewed in this paper. The factors affecting the catalytic activities of gold catalysts and the prospect of gold catalyst study were also conducted.
Peptide Segments Ligation and Synthesis of Peptide Thioester and Peptide Aldehyde
Ma Yuan**,Zhao Yufen
2003, 15 (05): 393- |
Published: 24 September 2003
Abstract
This review focuses on peptide segment ligation for synthesis of peptides and proteins. Ligation is a new methodology in peptide and protein synthesis chemistry. Peptide and protein can be obtained with high yield in aqueous buffer by coupling unprotected peptide segments without activation by enzymatic or chemical agents. The synthetic methods of peptide thioester and peptide aldehyde are also discussed.
Advances of Olefin Polymerization in Aqueous Solutions
Chen Liyi,Yang Haijian,Sun Wenhua**
2003, 15 (05): 401- |
Published: 24 September 2003
Abstract
It is a challenge to proceed catalytic system in aqueous medium on the base of environmental consideration. Although the first aqueous emulsion and suspension polymerization were industrialized long time ago, the polymerization promoted with Ziegler-Natta and Metallocene catalysts has difficulty in aqueous solution due to their high sensitivities to moisture. Recently the great progress of olefin polymerization has been made with the advent of low oxophilic late-transition metal catalysts. Herein the latest developments of olefin aqueous polymerization which are mainly promoted by late-transition metal catalysts are reviewed including ethylene, a-olefins, cyclo-olefins and dienes polymerization, along with ROMP of cyclo-olefins and CO/olefins copolymerization.
Recent Progress in Highly Branched Ferrocene-based Polymer
Wang Jianjun,Wang Li**,Wang Xuejie
2003, 15 (05): 409- |
Published: 24 September 2003
Abstract
Highly branched ferrocene-based polymers would be expected to possess a broad range of interesting characteristics. The development of these functional polymeric materials is of growing importance. In this paper, the recent progress of the synthesis, structure, properties and applications of highly branched ferrocene-based polymers was reviewed.
Direct Hydroxylation of Benzene into Phenol
Ren Yongli,Wang Li**,Zhang Xiangwen
2003, 15 (05): 420- |
Published: 24 September 2003
Abstract
Recent progress of catalytic reactions for direct hydroxylation of benzene to phenol were reviewed, including anodic oxidation and catalytic oxidation with nitrous oxide, hydrogen peroxide or molecular oxygen. As oxidants all the reactions are environmentally friendly with high atomic economy. The relevant catalysts and active sites as well as the industrialization prospect of these reactions are also discussed.
Chemical Process on Biological Interface--An Opinion on the Frontier of Chemical Biology
Wang Kui
2003, 15 (05): 428- |
Published: 24 September 2003
Abstract
The chemico-biological process on the interface established by cells and solid surface is a fundamental chemical problem confronted by medical, environmental, agricultural sciences as well as biotechnology. The bone-resorption mediated by osteoclasts was analyzed to exemplify the sequence of biological events and the chemical problems unsolved.
The Role Played by Chemical Biology in the Bio-Chip Technology
Zhao Xinsheng
2003, 15 (05): 436- |
Published: 24 September 2003
Abstract
Chemical Biology is a newly emerged cross discipline between chemistry and biology. Its basic task is to reveal the chemical nature of the biological phenomena, develop the chemical method to control the biological processes, and provide the chemical technology to the biological investigation. An example of the role of chemical biology in the development of the bio-chip technology is given to illustrate the basic features of current chemical biology.