Author(s): Wang, w (Wang, Wei); Wu, qr (Wu, Qunrong); Ding, lq (Ding, Liqin); Yang, zl (Yang, Zhilan); Zhang, aq (Zhang, Aiqing)




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Record 1 of 121

Author(s): Wang, W (Wang, Wei); Wu, QR (Wu, Qunrong); Ding, LQ (Ding, Liqin); Yang, ZL (Yang, Zhilan); Zhang, AQ (Zhang, Aiqing)

Title: Synthesis and characterization of soluble copolyimides containing chalcone and phosphine oxide moieties in the main chain

Source: JOURNAL OF APPLIED POLYMER SCIENCE, 107 (1): 593-598 JAN 5 2008

Language: English

Document Type: Article

Author Keywords: adhesion; copolymerization; polyimides

Keywords Plus: POLYIMIDES; POLYMER

Abstract: The functional diamines 3,3'-diaminochalcone and bis(3-aminophenyl)-3,5-bis(trifluoromethyl)phenyl phosphine oxide were successfully prepared by simple and convenient procedures with short reaction times, and the overall yields were 78 and 70%, respectively. Copolyimides prepared from 3,3'-diaminochalcone, bis(3-aminophenyl)3,5-bis(trifluoromethyl)phenyl phosphine oxide, and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride exhibited excellent solubility in several organic solvents, such as dimethyl sulfoxide, N,N-dimethylformamide, N-methyl pyrrolidone, tetrahydrofuran, and acetone. They also showed very good thermal stability even up to 450 degrees C for 5% weight loss (by thermogravimetric analysis) in nitrogen and a high glass-transition temperature up to 274 degrees C (by differential scanning calorimetry) in nitrogen. The copolymers' adhesive and photoreactive properties were also investigated, and it was confirmed that the copolyimide containing chalcone and phosphine oxide moieties in the main chain had good adhesiveness and photoreactivity. (C) 2007 Wiley Periodicals, Inc.

Addresses: S Cent Univ Nationalities, Hubei Key Lab Catalysis & Mat Sci, Coll Chem & Mat Sci, Wuhan 430074, Peoples R China; Wuhan Bioengn Inst, Dept Biotechnol, Wuhan 430415, Peoples R China

Reprint Address: Zhang, AQ, S Cent Univ Nationalities, Hubei Key Lab Catalysis & Mat Sci, Coll Chem & Mat Sci, Wuhan 430074, Peoples R China.

E-mail Address: aiqingzhang_2000@tom.com

Cited Reference Count: 12

Times Cited: 0

Publisher: JOHN WILEY & SONS INC

Publisher Address: 111 RIVER ST, HOBOKEN, NJ 07030 USA

ISSN: 0021-8995

29-char Source Abbrev.: J APPL POLYM SCI

ISO Source Abbrev.: J. Appl. Polym. Sci.

Source Item Page Count: 6

Subject Category: Polymer Science

ISI Document Delivery No.: 229RP


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Record 2 of 121

Author(s): Wang, WJ (Wang Weijia); Li, JL (Li Jinlin); Luo, MS (Luo Mingsheng)

Title: Effect of silica promoter on iron-based catalyst for Fischer-Tropsch synthesis

Source: CHINESE JOURNAL OF CATALYSIS, 28 (10): 925-930 OCT 2007

Language: Chinese

Document Type: Article

Author Keywords: Fischer-Tropsch synthesis; precipitated iron-based catalyst; silica; iron carbide; in-situ X-ray diffraction

Keywords Plus: CHIMIE MINERALE; SLURRY REACTOR; ACTIVATION; SPECTROSCOPY; PERFORMANCE

Abstract: A series of SiO2-incorporated precipitated Fe-Si-Cu-K (100Fe: xSi: 3.0Cu: 2.0K, x = 0, 2.8, 6.4, 8.2, atomic ratio) catalysts were prepared using the co-precipitation method for the Fischer-Tropsch synthesis (FTS). The in-si.tu X-ray diffraction (XRD) and N-2 physisorption were used to characterize the catalysts. The catalytic properties for FTS were tested in a fixed-bed reactor under pressure of 1.0 MPa and temperature of 543 K. The SiO2 incorporation increased the surface area and decreased the pore size of the precipitated iron catalysts, and the transition of different iron oxide and iron carbide phases ( Fe2O3, Fe3O4, Fe3C, Fe5C2, and Fe7C3) was detected by in-situ XRD during the catalyst reduction in CO and FTS reaction in syngas (H-2/CO molar ratio 0. 7). The activity of the catalyst without SiO2 increased sharply with time on stream during the FTS process, which was accompanied by the transition of Fe5C2 to Fe7C3. The catalyst without SiO2 deactivated rapidly when the highest CO conversion was achieved, whereas a persistent increase in the activity of catalysts with SiO2 was achieved with time on stream. These indicate that SiO2 can stabilize the activity of the precipitated iron catalyst. The observed effects of SiO2 On the catalytic performance of precipitated iron catalysts can be explained by the fact that SiO2 can improve the dispersity of iron oxides and iron carbides in the catalyst and restrain the conversion of different iron carbide phases during the catalyst reduction and FTS reaction.

Addresses: S Cent Univ Natl, Minist Educ, Key Lab Catalys & Mat Sci, State Ethnic Affairs Commiss, Wuhan 430074, Peoples R China; Univ Kentucky, Ctr Appl Energy Res, Lexington, KY 40511 USA

Reprint Address: Wang, WJ, S Cent Univ Natl, Minist Educ, Key Lab Catalys & Mat Sci, State Ethnic Affairs Commiss, Wuhan 430074, Peoples R China.

E-mail Address: lij@scuec.edu.cn

Cited Reference Count: 22

Times Cited: 0

Publisher: SCIENCE CHINA PRESS

Publisher Address: 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA

ISSN: 0253-9837

29-char Source Abbrev.: CHIN J CATAL

ISO Source Abbrev.: Chin. J. Catal.

Source Item Page Count: 6

Subject Category: Chemistry, Applied; Chemistry, Physical; Engineering, Chemical

ISI Document Delivery No.: 231TT


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Record 3 of 121

Author(s): Liu, JM (Liu, J.-M.); Meng, H (Meng, H.); Li, JI (Li, J.-I.); Liao, SJ (Liao, S.-J.); Bu, JH (Bu, J.-H.)

Title: Preparation of high performance Pt/CNT catalysts stabilized by ethylenediaminetetraacetic acid disodium salt

Source: FUEL CELLS, 7 (5): 402-407 OCT 2007

Language: English

Document Type: Article

Author Keywords: ethylenediaminetetraacetic acid disodium salt stabilizer; methanol electrooxidation; proton exchange; membrane fuel cells (PEMFC); Pt/CNT catalyst

Keywords Plus: ELECTROLYTE FUEL-CELLS; CARBON NANOTUBES; METHANOL; NANOPARTICLES; NANOCATALYST; PRECURSORS; DEPOSITION; REDUCTION; OXIDATION; METALS

Abstract: A novel method with ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) as a stabilizing agent was developed to prepare highly dispersed Pt nanoparticles on carbon nanotubes (CNTs) to use as proton exchange membrane (PEM) fuel cell catalysts. These nanocatalysts were obtained by altering the molar ratio of ethylenediaminetetraacetic acid disodium salt to chloroplatinic acid (EDTA-2Na/Pt) from 1:2, 1:1, 2:1 to 3:1. The well-dispersed Pt nanoparticles of around 1.5 nm in size on CNTs were obtained when the EDTA-2Na/Pt ratio was maintained at 1:1. And the Pt/CNT catalyst exhibited large electrochemical active surface areas, very high electrocatalytic activity and excellent stability in the oxidation of methanol at room temperature. The Pt/XC-72R catalyst with narrow size distribution was also prepared by this method for comparison purposes. Comparison of the catalytic properties of these catalysts revealed that the activity of the Pt/CNT catalyst was a factor of similar to 3 times higher than that of the Johnson Matthey catalyst and similar to 2 times higher than that of our Pt/XC-72R catalyst, which can be assigned to the high level of dispersion of Pt nanoparticles and the particular properties of the CNT supports.

Addresses: S China Univ Technol, Coll Chem, Guangzhou 510641, Guangdong, Peoples R China; S Cent Univ Natl, Coll Chem & Mat Sci, Wuhan 430071, Peoples R China; Tsing Hua Univ, Dept Chem, Beijing 100084, Peoples R China

Reprint Address: Liao, SJ, S China Univ Technol, Coll Chem, Guangzhou 510641, Guangdong, Peoples R China.

E-mail Address: chsjliao@scut.edu.cn

Cited Reference Count: 29

Times Cited: 0

Publisher: WILEY-V C H VERLAG GMBH

Publisher Address: PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY

ISSN: 1615-6846

29-char Source Abbrev.: FUEL CELLS

ISO Source Abbrev.: Fuel Cells

Source Item Page Count: 6

Subject Category: Electrochemistry; Energy & Fuels

ISI Document Delivery No.: 227NE


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Record 4 of 121

Author(s): Wu, YH (Wu, Yunhua); Hu, SS (Hu, Shengshui)

Title: Direct electron transfer of xanthine oxidase and its catalytic reduction to nitrate

Source: ANALYTICA CHIMICA ACTA, 602 (2): 181-186 OCT 29 2007

Language: English

Document Type: Article

Author Keywords: xanthine oxidase; nitrate; direct electron transfer; catalytic reduction

Keywords Plus: GLASSY-CARBON ELECTRODE; DIRECT ELECTROCHEMISTRY; NITRIC-OXIDE; MOLYBDENUM; NANOTUBES; BIOSENSOR; DEHYDROGENASE; GENERATION; KINETICS

Abstract: This work reports on the direct electrochemistry of the xanthine oxidase (XO) from buttermilk, a mononuclear molybdenum enzyme that comprises four redox active cofactors: a five-coordinate mononuclear Mo ion, two [2Fe-2S] clusters, and a flavin adenine dinucleotide (FAD) group. The Mo, [2Fe-2S] and FAD redox responses are obtained from the enzyme immobilized on an activated single-wall carbon nanotubes (SWNTs) modified glassy carbon electrode using protein film voltammetry. The formal potentials of which are -0.61 V, -0.47 V and -0.37 V (vs. SCE) at pH 5.0, respectively. Upon addition of nitrate to the electrochemical cell, a steady-state voltammogram and i-t amprometric response were observed, indicating XO can catalyze the reduction of nitrate. (C) 2007 Elsevier B.V. All rights reserved.

Addresses: Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China; S Cent Univ Natl, Key Lab Biotechnol Natl Commiss Natl, Wuhan 430074, Peoples R China

Reprint Address: Hu, SS, Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China.

E-mail Address: sshu@whu.edu.cn

Cited Reference Count: 31

Times Cited: 0

Publisher: ELSEVIER SCIENCE BV

Publisher Address: PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

ISSN: 0003-2670

29-char Source Abbrev.: ANAL CHIM ACTA

ISO Source Abbrev.: Anal. Chim. Acta

Source Item Page Count: 6

Subject Category: Chemistry, Analytical

ISI Document Delivery No.: 227AO


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Record 5 of 121

Author(s): Holmes, JL (Holmes, John L.); Aubry, C (Aubry, Christiane); Wang, X (Wang, Xian)

Title: Assessing thermochemical data

Source: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, 267 (1-3): 263-267 NOV 1 2007

Language: English

Document Type: Article

Author Keywords: hydroperoxides; peroxides; aldehydes; bond strengths

Keywords Plus: ENERGY; MOLECULES; DENSITY

Abstract: This paper describes, with examples, a critical assessment of thermochemical data for some small molecules and free radicals. The available heats of formation, Delta H-f degrees (all 298 K values). for simple alkyl hydroperoxides and di-alkyl peroxides were compared and new data are provided. The Delta H-f degrees values, all +/- 5 kJ/mol, are: CH3OOH, -135; CH3CH2OOH, -168; n-C3H7OOH, -189; S-C3H7OOH, -205; t-C4H9OOH, -240; CH3OOCH3, -132; CH3CH2OOCH3, -165; C2H5OOC2H5, -198; n-C(3)H(7)OOn-C3H7, -240; S-C3H7OOs-C3H7, -272; t-C(4)H(9)OOt-C4H9, -342. These are consistent with established O-O bond dissociation energies and with additivity considerations. Delta H-f degrees values for the corresponding alkoxy radicals are also addressed.

A similar survey was applied to the homologous n-alkyl aldehydes, C2 to C8, for which recommended Delta H-f degrees values, all +/- 1.5 kJ/mol, are: -166.5, - 189, -207.5, -227, -248, -268 and -289, respectively. Particular attention was given to Delta H-f degrees(CH3CO degrees) = -10.3 +/- 1.8 kJ/mol. The current NIST WebBook datum, Delta H-f degrees(CS) = 280.3 kJ/mol, is arguably the best value, being consistent with related thermochemical data. Finally the Delta H-f degrees values for the allylic free radicals *CH2CHCH2, 174 3 kJ/mol, CH2CHCH*(OH), 4.5 +/- 4 kJ/mol, and (CH2CH)(2)*(OH), 37 +/- 4 kJ/mol, derived from experimental data and results of computational chemistry are described, together with some related homolytic bond strengths. (C) 2007 Elsevier B.V. All rights reserved.

Addresses: Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada; S Cent Univ Natl, Coll Med & Mat Sci, Wuhan 430074, Peoples R China

Reprint Address: Holmes, JL, Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada.

E-mail Address: jholmes@science.uottawa.ca

Cited Reference Count: 16

Times Cited: 0

Publisher: ELSEVIER SCIENCE BV

Publisher Address: PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

ISSN: 1387-3806

29-char Source Abbrev.: INT J MASS SPECTROM

ISO Source Abbrev.: Int. J. Mass Spectrom.

Source Item Page Count: 5

Subject Category: Physics, Atomic, Molecular & Chemical; Spectroscopy

ISI Document Delivery No.: 224UY


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Record 6 of 121

Author(s): Cheng, YF (Cheng, Yan-Fu); Dai, TQ (Dai, Tong-Qing)

Title: Exact solutions of the Klein-Gordon equation with a ring-shaped modified kratzer potential

Source: CHINESE JOURNAL OF PHYSICS, 45 (5): 480-487 OCT 2007

Language: English

Document Type: Article

Keywords Plus: NIKIFOROV-UVAROV METHOD; MORSE-TYPE POTENTIALS; BOUND-STATE SOLUTIONS; SCHRODINGER-EQUATION; VECTOR POTENTIALS; DIRAC-EQUATION; EQUAL SCALAR; PLUS

Abstract: The Klein-Gordon equation for a recently proposed ring-shaped modified Kratzer potential is studied. The exactly normalized bound state wave functions and energy expressions are obtained for equal scalar and vector potentials by using the Nikiforov-Uvarov method.

Addresses: S Cent Univ Natl, Coll Elect & Informat Engn, Wuhan 430074, Peoples R China

Reprint Address: Cheng, YF, S Cent Univ Natl, Coll Elect & Informat Engn, Wuhan 430074, Peoples R China.

Cited Reference Count: 32

Times Cited: 0

Publisher: PHYSICAL SOC REPUBLIC CHINA

Publisher Address: CHINESE JOURNAL PHYSICS PO BOX 23-30, TAIPEI 10764, TAIWAN

ISSN: 0577-9073

29-char Source Abbrev.: CHIN J PHYS

ISO Source Abbrev.: Chin. J. Phys.

Source Item Page Count: 8

Subject Category: Physics, Multidisciplinary

ISI Document Delivery No.: 224OB


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Record 7 of 121

Author(s): Feng, SS (Feng Sheng-Sheng); Gu, YY (Gu Ying-Ying); Li, JL (Li Jin-Lin); Song, FX (Song Feng-Xuan)

Title: Preparation and characterization of mesoporous Ce0.5Zr0.5O2 mixed oxide

Source: CHINESE JOURNAL OF CHEMISTRY, 25 (10): 1499-1502 OCT 2007

Language: English

Document Type: Article

Author Keywords: mixed oxide; ceria; zirconia; dodecylbenzenesulfonate; mesoporous mesostructure

Keywords Plus: OXYGEN-STORAGE PROPERTIES; COMBUSTION PROCESS; SOLID-SOLUTIONS; CAPACITY; TEMPERATURE; BEHAVIOR; POWDERS

Abstract: Mesoporous (MSU) Ce0.5Zr0.5O2 mixed oxide with a high specific surface area has been synthesized under weak acidic condition in the presence of an anionic surfactant, sodium dodecylbenzenesulfonate. The effect of the pH value on the formation of mesostructure and the thermal stability of the material has been evaluated. The products were characterized by transmission electron microscopy, powder X-ray diffraction and nitrogen adsorption-desorption measurements. The results showed that the as-prepared Ce0.5Zr0.5O2 mixed oxide possessed a specific surface area of 163.3 m(2)center dot g(-1), which had a cubic fluorite-type structure and possessed specific surface areas of 148.4 and 62.4 m(2).g(-1) after calcination at 500 and 800 degrees C for 2 h, respectively. The material showed excellent thermal stability.
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