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Progress in Chemistry 2002, No.03 Previous issue Next issue

In this issue:

Review
Fabrications and Applications of Low Surface Free Energy Surfaces
Gu Guotuan1,2,Zhang Zhijun2** ,Dang Hongxin1,2
2002, 14 (03): 158- |
Published: 24 May 2002
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Abstract
Low surface free energy surfaces have many useful properties. In recent years, many methods have been reported to fabricate the low energy surfaces. In this paper, a detailed review on the subject of the formation and application of low free energy surfaces based on the incorporation of fluorine into material molecules is given.
Progress in Gel Electrolyte
Wang Qingwei,Xie Demin
2002, 14 (03): 167- |
Published: 24 May 2002
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Abstract
The research developments of gel electrolyte, a kind of new functional polymer materials are reviewed. The specific properties, types, the methods in studying their structure and function and the prospect of their application in electronic doubler layer capacitors are discussed.
The Application of Signal Processing in Resolving Overlapping Chemical Bands
Zhang Xiuqi,Liu Hui,Zheng Jianbin**,Kao Hung
2002, 14 (03): 174- |
Published: 24 May 2002
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Abstract
Chemical signals are always multi-component systems since measurements related to the chemical composition of a substance are very complex. As a result, resolving or recovering overlapping bands has become a crucial problem encountered in analytical chemistry. Chemometries is the discipline concerned with the application of statistical and mathematical methods, as well as those methods based on mathematical logic to chemistry. It is an alternative technique for resolving overlapping bands that cannot be instrumentally and physically resolved. In this paper, some signal processing techniques for resolution of unresolved bands are reviewed with 147 references.
The Development of Research in Molecular Imprinting Technique
Shi Ruixue,Guo Chenghai,Zou Xiaohong,Zhu Chunye,Zuo Yanjun,Deng Yundu
2002, 14 (03): 182- |
Published: 24 May 2002
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Abstract
Molecular imprinting is a borderline subject developed from combining high polymer chemistry and biochemistry. It is highly significant in research of the structure of enzyme, mechanism of receptor-antibody and analytical chemistry. In this paper, the essential theories, methods, development tendency, achievements and prospect of molecular imprinting technique are reviewed.
Recent Advances in Mechanisms and Kinetics of TiO2 Photocatalysis
Tang Yuchao,Hu Chun,Wang Yizhong
2002, 14 (03): 192- |
Published: 24 May 2002
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Abstract
Fundamental mechanisms of TiO2 heterogeneous photocatalysis for degrading wastes are based on some radical reactions. Under ultraviolet light the photocatalysts produce holes and electrons, which subsequently initiate oxidation and reduction reactions. Holes and electrons can react directly with organic species adsorbed on the surface of the catalysts and also can transform into high-energy chemical species such as hydroxyl radicals. Some organics such as dyes, which are sensitive to visible light, can also be degraded via excited states. Langmuir-Hinshelwood kinetics model describes the degradation rate expressions in terms of the disappearance of compounds. The kinetics of the photocatalysis is not only essential to practical applications but also is key aspect for understanding mechanisms of the photocatalysis.
Clay-intercalated Metal Complex Catalysts and Their Molecular Recognition Catalysis
Tao Longxiang,Zou Duoxiu
2002, 14 (03): 200- |
Published: 24 May 2002
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Abstract
The expandable layers of clay provide useful two dimensional hosts which facilitate introduction of catalytical active metal complexes by cation exchange and ligand exchange methods. Intercalation of metal complexes into the interlamellar space of clay is an excellent method for homogeneous catalyst heterogenization. Clay-intercalated metal complex catalysts display molecular-recognizing catalysis, such as shape selectivity, steroselectivity, regioselectivity. The application of these heterogenized catalysts in the asymmetric hydrogenation, regioselective hydrogenation, regioselective carbonylation and steroselective arylation is described in this review. Clay-intercalated metal complex catalysts exhibit sufficiently high activity and selectivity to make them competitive to the homogeneous catalysts.
Conducting Polymers
Li Yongfang
2002, 14 (03): 207- |
Published: 24 May 2002
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Abstract
The research field of conducting polymers has been developed since 1970s, and has attracted much attention due to their promising applications. In this paper, the discovery and developments of conducting polymers were introduced. The structures, doping characteristics, preparation methods, conductivity and electrochemical properties of conducting polymers, as well as the photoelectronic properties of conjugated polymers, were reviewed. In addition, possible applications and present hot topics of conducting polymers were discussed.
Advances in Bimolecule Self-assembling Functional Films and Their Applications in Molecular Devices
Li Yangmei,Chen Zhichun,He Lin,Xu Liheng,Lin Xianfu*
2002, 14 (03): 212- |
Published: 24 May 2002
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Abstract
There are four kinds of bioactive macromolecule self-assembling films developed in recent years such as monoenzyme, bienzyme, protein DNA and poly-self-assembling films. The applications of bioactive macromolecule self-assembling films in biosensors, molecular devices, catalysts and medical biomaterials are introduced.
Research and Application of the Calixarenecontaining Polymer Materials
Wang Li1,Shi Xianfa1,2**,Hu Xiaojun1,Liu Yu1
2002, 14 (03): 217- |
Published: 24 May 2002
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Abstract
Calixarenes, cyclic oligomer of phenol-formaldehyde condensates have attracted great interest in supramolecular chemistry due to their peculiar molecular recognition ability. Functional materials with molecular recognition ability can be obtained by blending or bonding calixarenes into the polymer materials. In this review, progress in the research and application of this kind of calixarene-containing polymer materials is presented in view of chemical sensors, chromatography and transport separation.
Progress on CO2 Conversion by Plasma-Catalysis
Dai Bin1,2**,Gong Weimin1,Zhang Xiuling1,He Ren1
2002, 14 (03): 225- |
Published: 24 May 2002
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Abstract
Progress in research of CO_2 activated by plasma and plasma-catalysis is summarized. The mechanism of CO_2 activation is also discussed. The problem at present is analyzed and research direction for the future is introduced.
Methylation of Metal (loid) Elements and Its Significance in Environmental Chemistry Studies
Liu Jiyan,Jiang Guibin
2002, 14 (03): 231- |
Published: 24 May 2002
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Abstract
Methylation is an important process of biogeochemical cycling for many toxic metal elements. In this paper, four methylating agents available for methyl transfer in natural system and three alternative mechanisms of methylation are summarized. The significance of metal methylation in environmental chemistry studies is also discussed.