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17 results on '"Jiang, Kai-yu"'

5. Cysteine residue-bridged dinuclear Ni–Fe complexes related to [NiFe]-H2ases.

Author

Song, Li-Cheng, Zhang, Zhen-Qing, Gu, Zhen-Chao, and Jiang, Kai-Yu

Subjects
CYSTEINE, OVERPOTENTIAL, DIPHOSPHINE, MOIETIES (Chemistry), X-rays, CATALYSTS
Abstract

To develop the biomimetic chemistry of [NiFe]-H2ases, we have synthesized cysteine residue-containing [NiFe]-H2ase mimics (diphosphine)Ni[SCH2CH(CO2Me)NHCOC5H4-η5]2Fe (1, diphosphine = Ph2P(CH2)2PPh2; 2, Ph2PCH＝CHPPh2; 3, 1,2-(Ph2P)2C6H4; 4, (Ph2P)2NCH2C6H4Me-p; 5, (Ph2P)2NCH2CO2Et; and 6, (Ph2P)2N-2-CH2C5H4N) for the first time by a simple and convenient method. The full spectroscopic characterization of 1–6 along with X-ray crystallographic characterization of 1, 2 and 4 has proved that complexes 1–6 consist of two cysteine residue moieties that are bridged to their diphosphine-chelated Ni(II) centers and two η5-cyclopentadienyl-coordinated Fe(II) centers. On the basis of electrochemical and electrocatalytic studies, complexes 1 and 4 have been found to be catalysts for H2 production from HOAc with moderate icat/ip and overpotential values under CV conditions. In addition, a possible 2E2C (E = electrochemical, C = chemical) mechanism is briefly suggested for this type of H2 evolution reaction (HER). [ABSTRACT FROM AUTHOR]

Published
2021
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6. Synthesis, characterization, and some properties of two types of new [Fe]-H2ase models containing a 4-phosphatopyridine or a 4-phosphatoguanosinepyridine moiety.

Author

Song, Li-Cheng, Chen, Wei, Zhu, Liang, Hu, Fu-Qiang, and Jiang, Kai-Yu

Subjects
MOIETIES (Chemistry), X-ray crystallography, MOLECULAR structure, MOLECULAR models, CATALYSTS
Abstract

Two types of new [Fe]-H2ase models were synthesized using well-designed synthetic methods. The first type of trisubstituted pyridine ligand-containing models [2-MeOCH2-4-O2P(OPh)2-6-COCH2C5H2N]Fe(CO)2R (1, R = I; 2, R = EtS, 3, R = MeCOS), [2-MeOCH2-4-O2P(OPh)2-6-COCH2C5H2N]Fe(CO)2(MeCN)BF4 (4) and [2-MeOCH2-4-O2P(OPh)2-6-COCH2C5H2N]Fe(CO)(PPh3)I (5) were synthesized on the basis of preparing the new trisubstituted pyridine precursors L1–L6, whereas the second type of pentasubstituted pyridine ligand-containing model [2-MeO-3,5-Me2-4-OP＝O(OPh)O-5′-(N2-iPrCO-2′,3′-O-CMe2-guanosine)-6-COCH2C5N]Fe(CO)2(η2-6-Me-2-SC5H3N) (6) was synthesized via the esterification reaction of a new phosphatoguanosine derivative L7 with the corresponding pentasubstituted pyridine ligand-containing precursor (2-MeO-4-HO-3,5-Me2-6-COCH2C5N)Fe(CO)2(η2-6-Me-2-SCH5H3N) (D) in the presence of the dehydrating agent DCC. While all the new precursors L1–L7 and models 1–6 were fully characterized via elemental analysis and various spectroscopic techniques, the molecular structures of model 5 and precursor D were confirmed via X-ray crystallography. In addition, model 1 has been found to be a catalyst for proton reduction to H2 from TFA under CV conditions. [ABSTRACT FROM AUTHOR]

Published
2020
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7. The numerical simulation of thermal-gradient CVI process on positive pressure condition

Author

Jiang Kai-yu, Wang Min-jie, and Li Hejun

Subjects
Fabrication, Materials science, Computer simulation, Mechanical Engineering, Carbon fibers, Positive pressure, Condensed Matter Physics, Temperature gradient, Mechanics of Materials, visual_art, Chemical vapor infiltration, Homogeneity (physics), visual_art.visual_art_medium, General Materials Science, Composite material
Abstract

Normally, carbon/carbon (C/C) composites are manufactured by negative pressure CVI process. The products manufactured by this process may have higher density, but it takes a very long time and the reaction gases cannot be utilized adequately. The experimental results indicated that the densification rate of C/C composites can be greatly increased and the reaction gas can be utilized more adequately by applying positive pressure chemical vapor infiltration (CVI) process. However, the density homogeneity of the products manufactured by this process is relatively lower. To solve this problem, numerical simulation technology is applied to analyze the characters and feasibility of thermal-gradient CVI (TCVI) process on positive pressure condition. The result indicates that the thermal-gradient CVI process can increase the density homogeneity and densification rate of C/C composites greatly.

Published
2002

8. A novel suspension design for MEMS sensing device to eliminate planar spring constants mismatch

Author

Wensyang Hsu, Yi-Chueh Shieh, Chen-Yuan Hung, Miao Yen-Wu, Jiang Kai-Yu, He-Ling Chen, and Lee Yueh-Kang

Subjects
Microelectromechanical systems, Beam diameter, Engineering, business.industry, Spring (device), Acoustics, Capacitive sensing, Electrical engineering, Proof mass, business, Suspension (vehicle), Coil spring, Microfabrication
Abstract

This paper presents a new suspension design for planar MEMS sensing devices. The new design includes four coil springs which are symmetrically arranged with respect to the center of the proof mass with 90-degree orientation difference. The proposed coil spring design is found to take less area to achieve similar spring constant than the conventional serpentine spring design. Furthermore, the proposed symmetrical-to-center arrangement on suspension can reduce spring constants mismatch between X and Y axes, even under beam width deviation due to fabrication resolution. This concept is realized and verified by experimental results from two-axis capacitive accelerometers through a polysilicon-based CMOS fabrication platform.

Published
2012

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