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1. Self-assembly of comb copolymers by dynamic density functional theory | |||
Yan Xiaoyan,Liang Haojun | |||
Chemistry 22 December 2005 | |||
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Abstract:Using the dynamic mean-field density functional method, we explore microphase of ABC comb copolymers in a two-dimensional space. Simulations are carried out for different copolymer architectures. The application of this method to comb copolymers melts leads to some microphases patterns, such as corolla, lamellae and knitting nap pattern, etc. By systematically varying the Flory-Huggins parameters, phase diagrams are made for the two different systems. When both volume fractions and interaction energies of three species are same for the two systems, the stable microphases depend greatly on their architectures. | |||
TO cite this article:Yan Xiaoyan,Liang Haojun . Self-assembly of comb copolymers by dynamic density functional theory[OL].[22 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4576 |
2. Relativistic Density Functional Study on the Dehydrogenation Reactivity of PtMCH2+ (M=Cu, Ag, Au, Pt) toward NH3 | |||
Xia Fei,Jian Chen,Zexing Cao | |||
Chemistry 22 December 2005 | |||
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Abstract:The reactivity of bimetallic species PtMCH2+(M=Pt, Cu, Ag, Au) toward NH3 has been explored by the relativistic density functional approach. Calculated results reveal that the hydrogenation reactivity of PtMCH2+(M=Cu, Ag, Au, Pt) strongly depends on their lower-energy reactive precursors. The coexistence of the closed- and unclosed-triangular structures as precursors to distinct dehydrogenation channels for PtMCH2+(M=Cu, Ag, Au) make them exhibit similar reactivity. Predicted free energies of the reaction DG° reasonably agree with the experimental ratio of the product. | |||
TO cite this article:Xia Fei,Jian Chen,Zexing Cao. Relativistic Density Functional Study on the Dehydrogenation Reactivity of PtMCH2+ (M=Cu, Ag, Au, Pt) toward NH3[OL].[22 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4559 |
3. CuO Nanoparticles as an Amperometric Sensor for Cysteine | |||
Hui Yao,Jin-Zhong Xu,Jun-Jie Zhu | |||
Chemistry 20 December 2005 | |||
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Abstract:CuO nanoparticles with an average size of 5nm have been successfully prepared by microwave irradiation. Nanosized CuO has been found to be more electrocatalytical ability than that of the bulk CuO particles, the oxidation current of the cysteine is enlarged on nanosized copper oxide modified carbon paste electrode. The linear relation between this sampling current and the cysteine concentration is over the range of 10 μM –10 mM with a correlation coefficient of 0.998. The detection limit is 6 μM of cysteine when the signal to noise ration is 3. | |||
TO cite this article:Hui Yao,Jin-Zhong Xu,Jun-Jie Zhu. CuO Nanoparticles as an Amperometric Sensor for Cysteine [OL].[20 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4507 |
4. New amperometric glucose biosensor by entrapping glucose oxidase into chitosan/nanoporous ZrO2/multiwalled carbon nanotubes nanocomposite film | |||
Xiurong Zhai,Jinxiang Zeng,Yanping Gao ,Shuguo Gong,Wanzhi Wei | |||
Chemistry 30 November 2005 | |||
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Abstract:A new nanocomposite material for construction of glucose biosensor was proposed. The biosensor was formed by entrapping glucose oxidase in chitosan (CHIT)/nanoporousZrO2/multiwalled carbon nanotubes (MWNTs) nanocomposite. In this biosensing thin film, MWNTs can effectively catalyze hydrogen peroxide and nanoporous ZrO2 can enhance the stability of the immobilized enzyme. The resulting biosensor provides a very effective matrix for the immobilization of Gox and exhibites a wide linear response range of 8 mmol·L-1 to 3 mmol·L-1 with a correlation coefficient of 0.994 for the detection of glucose. And the response time and detection limit (S/N=3) of the biosensor are determined to be 6 s and 3.5 mmol·L-1, respectively. Another attractive characteristic is that thebiosensor is inexpensive, stable and reliable. | |||
TO cite this article:Xiurong Zhai,Jinxiang Zeng,Yanping Gao , et al. New amperometric glucose biosensor by entrapping glucose oxidase into chitosan/nanoporous ZrO2/multiwalled carbon nanotubes nanocomposite film [OL].[30 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3934 |
5. Nonlinear Conductive Media Based Modeling of Electrochemistry System | |||
Zhou Ting,Wang Kang,Xia Xinghua | |||
Chemistry 30 November 2005 | |||
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Abstract:In this article, we for the first time present a nonlinear conductive media based approach for modeling of electrochemistry system using black box method. The bulk of electrolyte solution and the main body of solid electrode are modeled to be normal conductive media, while the interface between the solution and the electrode is modeled to be nonlinear conductive media, which is characterized by inconstant conductivity. This novel electrochemistry system modeling approach is verified by comparison of experiment data, and contributes to a better understanding the distribution of electrical potential and current, especially in complicated electrochemistry systems. | |||
TO cite this article:Zhou Ting,Wang Kang,Xia Xinghua . Nonlinear Conductive Media Based Modeling of Electrochemistry System[OL].[30 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3931 |
6. Off-line form of the Michaelis-Menten equation for studying the enzyme kinetics in a polymer microchip integrated with enzyme microreactor | |||
Liu Ailin,Zhou Ting,Xia Xinghua | |||
Chemistry 30 November 2005 | |||
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Abstract:We firstly transformed the traditional Michaelis–Menten equation into an off-line form which can be used for evaluating the Michaelis–Menten constant after the enzymatic reaction. For experimental estimation of the kinetics of enzymatic reactions, we developed a facile and effective method integrating an enzyme microreactor into a direct-printing polymer microchip. Strong nonspecific adsorption of proteins was utilized to immobilize effectively enzyme onto microchannel wall, forming the integrated on-column enzyme microreactor in a microchip. The property of the integrated enzyme microreactor was evaluated by using the enzymatic reaction of glucose oxidase (GOx) with its substrate glucose. Reaction product-hydrogen peroxide was electrochemically (EC) detected using a Pt microelectrode. Rapid determination of the enzyme kinetics using our off-line form of the Michaelis–Menten equation was achieved (Km= 2.64 mM), which is much smaller than that reported in solution (Km= 6.0 mM). Due to the hydrophobic property and the native mesoscopic structure of the poly(ethylene terephthalate) film as indicated by the atomic force microscopic measurement, the immobilized enzyme in the microreactor shows good stability and bioactivity under the flowing conditions. | |||
TO cite this article:Liu Ailin,Zhou Ting,Xia Xinghua . Off-line form of the Michaelis-Menten equation for studying the enzyme kinetics in a polymer microchip integrated with enzyme microreactor[OL].[30 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3928 |
7. New study on direct detection of trace copper in the presence of ionic surfactant | |||
Gong Shuguo,Xia Jianjun,Wei Wanzhi,Jian Yin,Zeng Jinxiang ,Liu Xiaoying ,Zhai Xiurong | |||
Chemistry 29 November 2005 | |||
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Abstract:A new method for the direct detection of trace copper in the presence of ionic surfactant was developed, based on the response of differential pulse anodic stripping voltammetry at a gold electrode modified with self-assembled monolayer of 2-mercaptobenzimidazole(MBI).Experimental results indicated that MBI monolayer could prevent electrode surface fouling by ionic surfactant and that after preconcentration, copper down to 0.01 mmol l-1 in the presence of 0.5 mg ml-1 hexadecyl trimethyl ammonium bromide could be detected. The features of the new method were to be simple, sensitive and low-cost. | |||
TO cite this article:Gong Shuguo,Xia Jianjun,Wei Wanzhi, et al. New study on direct detection of trace copper in the presence of ionic surfactant [OL].[29 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3868 |
8. (Salen)Ti(IV)-Catalyzed Asymmetric Ring-opening of Monosubstituted Epoxides with Dithiophosphorus Acid | |||
Zhou Zhenghong,Wang Quanyong,Liu Bing ,Guofeng Zhao,Qilin Zhou,Chuchi Tang | |||
Chemistry 24 November 2005 | |||
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Abstract:The asymmetric ring-opening of monosubstituted epoxides with dithiophosphorus acids catalyzed by a (salen)Ti(IV) complex formed in situ from the reaction of Ti(OPr-i)4 and the chiral salen ligand derived from (1R,2R)-(+)-diaminocyclohexane and (R)-2,2’-diamino-1,1’- binaphthalene was realized. The resulting products were obtained with moderate enantioselectivity (up to 59% ee). High regioselectivity was observed for the alkyl substituted epoxides, whereas poor regioselectivity was obtained for the aryl substituted epoxides. | |||
TO cite this article:Zhou Zhenghong,Wang Quanyong,Liu Bing , et al. (Salen)Ti(IV)-Catalyzed Asymmetric Ring-opening of Monosubstituted Epoxides with Dithiophosphorus Acid[OL].[24 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3769 |
9. Adjusting helical silver(I) polymeric structures by 2-pyrimidyl- and 4-pyridyl- thioacetates | |||
Huang Yongqing,Zhang Hui ,Hao Hongqing ,Zhu Zhaojie ,Chen Jiangu ,Gao Jingxing | |||
Chemistry 23 September 2005 | |||
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Abstract:A novel chiral coordination polymer [Ag(pmta)]n (1, pmta- = 2-pyrimidylthioacetate) has been synthesized and structurally characterized by single-crystal X-ray diffraction analysis, in which the AgI centre is four-coordinated by N, O, O, and S atoms from three different tridentate pmta- ligands to construct two types of coaxial single-stranded helices. The complex exhibits strong fluorescence emission in the solid state and modest power second harmonic generation efficiency at room temperature. The adjustment of helical Ag(I) coordination architectures by two slight different building blocks, pmta- and pyta- (pyta- = 4-pyridylthioacetate), has also been investigated. | |||
TO cite this article:Huang Yongqing,Zhang Hui ,Hao Hongqing , et al. Adjusting helical silver(I) polymeric structures by 2-pyrimidyl- and 4-pyridyl- thioacetates[OL].[23 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2989 |
10. O-floating adn O-diffusing at metal surfaces | |||
SUn Changqing | |||
Chemistry 08 September 2005 | |||
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Abstract:The obsercved O-floating or diffusing at metal surfaces are attributed to the processed of tetrahedron bond switching under a certain conditions. | |||
TO cite this article:SUn Changqing. O-floating adn O-diffusing at metal surfaces[OL].[ 8 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2824 |
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