Progress in Chemistry

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Attraction between Like-Charge Particles

Zhang Bo,Liu Honglai^**,Hu Ying

Progress in Chemistry. 2001, 13(01): 1.

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Zhang Bo,Liu Honglai^**,Hu Ying. Attraction between Like-Charge Particles[J]. Progress in Chemistry, 2001, 13(01): 1-.

The existence of long2range electro static attraction between particles with like charge is one of the great current cont roversies of colloidal science. The classicalDLVO theory predicts that an isolated pair of like2charged colloidal spheres in elect rolyte should experience apurely repulsive Coulombic interaction. Direct measurements of such interactions have shown excellent agreement with DLVO theory.Recent experiments, however, provide evidence that the effective in terparticle potential show a long2range attraction under certain condition s. A satisfactory theoretical explanation for this behavio r has proven elusive. There are even some doubts about its origin. Further experimental and theoretical investigations of this surprising phenomenon could be very rewarding.
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Nanostructure and Analysis of Porous Carbons

Liu Zhenyu,Zheng Jingtang,Wang Maozhang,Zhang Bijiang

Progress in Chemistry. 2001, 13(01): 10.

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Liu Zhenyu,Zheng Jingtang,Wang Maozhang,Zhang Bijiang. Nanostructure and Analysis of Porous Carbons[J]. Progress in Chemistry, 2001, 13(01): 10-.

Porous carbons are composed of nanoparticles,surfaces,irregular textures and nanospaces. Nano structure includes nanospace and nanoparticle because the pores ranges and the particles are both in the nanometer scale. The research in terests on adsorption focus on microstructure and adsorption mechanism of porous solids. These are helpful for s to further understand the process of adsorption, adsorption model and adsorption mechanism.
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Development of Titanium Silicon Catalytic Materials.Preparation of Titania-Silica Mixed Oxides and Its Catalytic Properties

Zhang Yihua,Wang Xiangsheng,Guo Xinwen

Progress in Chemistry. 2001, 13(01): 19.

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Zhang Yihua,Wang Xiangsheng,Guo Xinwen. Development of Titanium Silicon Catalytic Materials.Preparation of Titania-Silica Mixed Oxides and Its Catalytic Properties[J]. Progress in Chemistry, 2001, 13(01): 19-.

Titanium silicon catalytic materials gives new ways for the studies of the catalytic oxidizing reactions and the exploitation of the environmental benign chemical engineering processes. Titan ia2silica mixed oxides has at tracted more at tention because of its tailor preparing method and the easy operating process. This article summarizes the preparation of titania2silica mixed oxides. The factors effecting on the character and catalytic properties of the materials,such as preparing method,drying method, content of titanium and surface modification, as well as the prospect of application have been discussed.
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Cloud-Point Extraction and Its Applications to the Separation and Analysis of Biopolymers

Ma Yue,Yan Zhe,Huang Junxiong

Progress in Chemistry. 2001, 13(01): 25.

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Ma Yue,Yan Zhe,Huang Junxiong. Cloud-Point Extraction and Its Applications to the Separation and Analysis of Biopolymers[J]. Progress in Chemistry, 2001, 13(01): 25-.

Cloud2point extraction(CPE ) is a kind of new environmentally benign liquid2liquid extraction method. In this paper the phase separation behavior of some surfactant micelle solutions is introduced. The experimental protocol of CPE is outlined. The specific application s of such systems to the separation and purification of biopolymers and bioanalysis are summarized and discussed. The development trend of CPE is also presented.
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The Application of Modified Heterogeneous Chiral Catalysts in Asymmetric Synthesis

Li Xiaodong,Lü Shijie,Chan Albert SC

Progress in Chemistry. 2001, 13(01): 33.

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Li Xiaodong,Lü Shijie,Chan Albert SC. The Application of Modified Heterogeneous Chiral Catalysts in Asymmetric Synthesis[J]. Progress in Chemistry, 2001, 13(01): 33-.

The application of modified heterogeneous chiral catalysts in asymmetric synthesis is described in this review. Several types of heterogeneous catalytic systems, including immobilized transition metal complexes, chirally modified metal catalys s, chiral zeolite and clay2intercalated chiral catalysts, are summarized according to different preparative methods and catalytic reactions. The reaction mechanism intart rate modified catalysts and cinchona modified catalysts are also discussed.
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Progress in Preparation of A-Arylpropionic Acids through Catalytic Carbonylation

Xie Baohan,Zhang Yuhua

Progress in Chemistry. 2001, 13(01): 43.

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Xie Baohan,Zhang Yuhua. Progress in Preparation of A-Arylpropionic Acids through Catalytic Carbonylation[J]. Progress in Chemistry, 2001, 13(01): 43-.

This article reviews preparation of A2arylpropionic acids through catalytic carbonylation processes with more than 46 references.
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Progress of Polymerization and Copolymerization with Ethylene of Cycloolefines

Zhao Jian,Lü　Yingying,Hu Youliang

Progress in Chemistry. 2001, 13(01): 48.

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Zhao Jian,Lü　Yingying,Hu Youliang. Progress of Polymerization and Copolymerization with Ethylene of Cycloolefines[J]. Progress in Chemistry, 2001, 13(01): 48-.

The synthesis research and application in polymerization of cycloolefines and copolymerization with A2olefin ( including addition polymerization and ring2opening metathesis polymerization ) are review ed1 The structures of the different catalysts, the mechanism of homopolymerization and copolymerization, the properties of polymers and copolymers are discussed in detail1 The applications of these polymers and copolymers are also reported1
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Advances in Research on Surface Engineering of Biomaterials for Tissue Engineering

Cai Kaiyong,Lin Songbai,Yao Kangde

Progress in Chemistry. 2001, 13(01): 56.

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Cai Kaiyong,Lin Songbai,Yao Kangde. Advances in Research on Surface Engineering of Biomaterials for Tissue Engineering[J]. Progress in Chemistry, 2001, 13(01): 56-.

　Biomaterials as artificial extracellular martixes (ECM s) have played a great role in tissue engineering1 This paper analyzed the interaction between cells and biomaterials surface. The complexity of biomaterials were discussed in some aspects such as the biomaterials contain ing water, biomaterials surface topography, biomaterials surface specificity recognition, as well as healing induced by biomaterials,. The effect of biomaterials on cells is a bi2directional, dynamic process, regulating the balance between cell growth and apoptosis, and is a challenge to biomaterials design and surface modification1 Based on the effect of biomaterials on cells growth, some ideas were put forward, e. g. biomimetic modification of biomaterials surface for improving cells affinity, carbohydrate cluster, glycolipid and protein modifying biomaterials surface in order to enhance cells specificity recognition, self2assembly of materials to modify surface topography1
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Chemical Recycling of Waste Poly (Ethylene Terephthalate)

Yang Yong,Lü Yijun,Xu Yuanyuan,Xiang Hongwei

Progress in Chemistry. 2001, 13(01): 65.

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Yang Yong,Lü Yijun,Xu Yuanyuan,Xiang Hongwei. Chemical Recycling of Waste Poly (Ethylene Terephthalate)[J]. Progress in Chemistry, 2001, 13(01): 65-.

Waste poly (ethylene terephalate) (PET ) can be recyclized by chemical depolymerization.This paper reviews the state of the art of chemical recycling of PET polyester and introduces several methods for chemical recycling such as hydrolysis, methanolysis, glycolysis and so on. At the same time,the advantages and disadvantages of each method on technical process are also compared.

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