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Structural insight into palladium-nickel clusters over mordenite zeolite for carbene-insertion reaction

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 89-99页

作者： Guangchao Li Ping-Luen Baron Ho Bryan Kit Yue ng Tai-sing Wu Pawel Rymarz Shik Chi Edman Tsang Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Chemistry University of OxfordOxford OX13QRUK Synchrotron Radiation Research Center Hsinchu 30076China

The advancement of heterogeneous catalysts incorporating metal clusters in the nanometric size range has garnered significant attention due to their extraordinary catalytic activity and *** detailed characterization and understanding of the atomic structure of these metal clusters within catalysts is crucial for elucidating the underlying reaction *** the present study,a distinctive three-atom PdNi cluster,characterized by two Pd atoms at terminal positions and a central Ni atom,was synthesized over mordenite *** presence of atomic PdNi clusters within the eight-membered ring side pocket area was confirmed by multiple advanced analytical techniques,including magic-angle spinning nuclear magnetic resonance spectroscopy,synchrotron X-ray powder diffraction,extended X-ray absorption fine structure spectroscopy,and high-angle annular dark-field scanning transmission electron *** catalytic activity of the confined active species was examined by the carbene-mediated reactions of ethyl-2-diazoacetate to ethyl-2-methoxyacetate as a model *** to the Pd-mordenite and Ni-mordenite,the PdNi-mordenite catalyst incorporates a PdNi cluster,which demonstrates a superior performance,achieving 100%conversion and high selectivity under the same reaction *** study elucidates the potential of constructing bimetallic clusters in zeolites,providing valuable insights for developing new heterogeneous catalysts applicable to a wide range of catalytic processes.

关键词： zeolite metal cluster synchrotron X-ray diffraction carbene-mediated reaction

Syntheses,structures,and reactivity of ruthenium(Ⅱ) hydride complexes containing Klui's oxygen tripodal ligand

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Science China Chemistry 2010年第10期53卷 2139-2143页

作者： ng Ho-Yuen LAI Chun-sing WILLIAMS Ian D. LEUng Wa-Hung Department of Chemistry The Hong Kong University of Science and Technology

Treatment of Ru(CO)(Cl)(H)(PPh3)3 with NaLOEt (LOEt-= [CpCo{P(O)(OEt)2}3]-) afforded the hydride complex (PPh3)(CO)-LOEtRu(H) (1), which has been characterized by X-ray crystallography. Similarly, the tricyclohexylphosphine analogue, (PCy3)(CO)LOEtRu(H) (2), was synthesized from Ru(CO)Cl(H)(PCy3)2 and NaLOEt. Treatment of complex 1 with R'SO2N3 afforded the (arylsulfonyl)amido complexes LOEtRu(CO)(PPh3)(NHSO2R) (R = 2,4,6-i-Pr3C6H2 (3), 4-t-BuC6H4 (4)). The crystal structure of complex 3 has been determined. The Ru-N distance and Ru-N-S angle in 3 are 2.076(3) and 126.14(16)°, respectively. Reactions of complex 1 with acids have been studied.

关键词： ruthenium oxygen tripodal ligand hydride complex (arylsulfonyl)amido complex

A monolithic InP/SOI platform for integrated photonics

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Light(Science & Applications) 2021年第11期10卷 2143-2152页

作者： Zhao Yan Yu Han Liying Lin Ying Xue Chao Ma Wai Kit ng Kam sing Wong Kei May Lau Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Physics and William Mong Institute of Nano Science and Technology Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

The deployment of photonic integrated circuits(PICs)necessitates an integration platform that is scalable,high-throughput,cost-effective,and *** we present a monolithic InP on SOI platform to synergize the advantages of two mainstream photonic integration platforms:Si photonics and InP *** monolithic InP/SOI platform is realized through the selective growth of both InP sub-micron wires and large dimension InP membranes on industry-standard(001)-oriented silicon-on-insulator(SOI)*** epitaxial InP is in-plane,dislocation-free,site-controlled,intimately positioned with the Si device layer,and placed right on top of the buried oxide layer to form“InP-on-insulator”.These attributes allow for the realization of various photonic functionalities using the epitaxial InP,with efficient light interfacing between the III-V devices and the Si-based *** exemplify the potential of this InP/SOI platform for integrated photonics through the demonstration of lasers with different cavity designs including subwavelength wires,square cavities,and *** results here mark a critical step forward towards fully-integrated Si-based PICs.

关键词： SOI monolithic integration

2D materials for conducting holes from grain boundaries in perovskite solar cells

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Light(Science & Applications) 2021年第4期10卷 695-706页

作者： Peng You Guanqi Tang Jiupeng Cao Dong Shen Tsz-Wai ng Zafer Hawash Naixiang Wang Chun-Ki Liu Wei Lu Qidong Tai Yabing Qi Chun-sing Lee Feng Yan Departm ent of Applied Physics The Hong Kong Polytechnic UniversityHung HornKowloonHong KongChina College of New Materials and New Energies Shenzhen Technology University518118 ShenzhenChina Center of Super-Diamond and Advanced Films(COSDAF) Department of ChemistryCity University of Hong KongHong KongChina Energy Materials and Surface Sciences Unit(EMSSU) Okinawa Institute of Science and Technology Graduate University(OIST)1919-1 TanchaOnna-sonOkinawa 904-0495Japan University Research Facility in Materials Characterization and Device Fabrication The Hong Kong Polytechnic UniversityHung HornKowloonHong KongChina

Grain boundaries in organic-inorganic halide perovskite solar cells(PSCs)have been found to be detrimental to the photovoltaic performance of ***,we develop a unique approach to overcome this problem by modifying the edges of perovskite grain boundaries with flakes of high-mobility two-dimensional(2D)materials via a convenient solution process.A synergistic effect between the 2D flakes and perovskite grain boundaries is observed for the first time,which can significantly enhance the performance of *** find that the 2D flakes can conduct holes from the grain boundaries to the hole transport layers in PSCs,thereby making hole channels in the grain boundaries of the ***,2D flakes with high carrier mobilities and short distances to grain boundaries can induce a more pronounced performance enhancement of the *** work presents a cost-effective strategy for improving the performance of PSCs by using high-mobility 2D materials.

关键词： materials. process. perovskite

Room temperature Ⅲ–Ⅴ nanolasers with distributed Bragg reflectors epitaxially grown on(001) silicon-on-insulators

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Photonics Research 2019年第9期7卷 1081-1086页

作者： YU HAN WAI KIT ng YIng XUE KAM sing WOng KEI MAY LAU Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Physics and William Mong Institute of Nano Science and Technology Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Efficient, scalable, bufferless, and compact Ⅲ–V lasers directly grown on(001)-oriented silicon-on-insulators(SOIs) are preferred light sources in Si-photonics. In this article, we present the design and operation of Ⅲ–V telecom nanolaser arrays with integrated distributed Bragg reflectors(DBRs) epitaxially grown on industry-standard(001) SOI wafers. We simulated the mirror reflectance of different guided modes under various mirror architectures, and accordingly devised nanoscale DBR gratings to support high reflectivity around1500 nm for the doughnut-shaped TE01 mode. Building from InP/IngaAs nanoridges grown on SOI, we fabricated subwavelength DBR mirrors at both ends of the nanoridge laser cavities and thus demonstrated room-temperature low-threshold InP/IngaAs nanolasers with a 0.28 μm^2 cross-section and a 20 μm effective cavity length. The direct growth of these bufferless nanoscale Ⅲ–V light emitters on Si-photonics standard(001) SOI wafers opens future options of fully integrated Si-based nanophotonic integrated circuits in the telecom wavelength regime.

关键词： IngaAs InP SOI nanolasers with distributed Bragg reflectors epitaxially grown on Room temperature silicon-on-insulators Bragg

Contemporary outcomes in the detection of prostate cancer using transrectal ultrasound-guided 12-core biopsy in singaporean men with elevated prostate specific antigen and/or abnormal digital rectal examination

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Asian Journal of Urology 2015年第4期2卷 187-193页

作者： Alvin Lee sing Joo Chia Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Urology Tan Tock Seng HospitalSingapore

Objective:Despite being the third commonest cancer in singaporean men,there is a dearth of basic data on the detection rate of prostate cancer and post-procedure complication rates locally using systematic 12-core *** objective is to evaluate prostate cancer detection rates using 12-core prostate biopsy based on serum prostate specific antigen(PSA)levels and digital rectal examination(DRE)findings in singaporean men presenting to a single tertiary *** secondary objective is to evaluate the complication rates of transrectal prostate ***:We retrospectively examined 804 men who underwent first transrectal-ultrasound(TRUS)guided 12-core prostate biopsies from January 2012 to April *** biopsies were performed on men presenting to a tertiary institution when their PSA levels were4.0 ng/mL and/or when they had suspicious DRE ***:Overall prostate cancer detection rate was 35.1%.Regardless of DRE findings,patients were divided into four subgroups based on their serum PSA levels:0e3.99 ng/mL,4.00 e9.99 ng/mL,10.00e19.99 ng/mL and20.00 ng/mL and their detection rates were 9.5%,20.9%,38.4% and 72.3%,*** detection rate of cancer based on suspicious DRE findings alone was 59.2% compared to 36.5% based on serum PSA cut-off of 4.0 ng/mL *** post-biopsy admission rate for sepsis was 1.5%.Conclusion:In conclusion,using contemporary 12-core biopsy methods,the local prostate cancer detection rate based on serum PSA and DRE findings has increased over the past decade presumably due to multiple genetic and environmental ***-biopsy sepsis remains an important complication worldwide.

关键词： Digital rectal examination Oncology Prostate cancer Prostate specific antigen Transrectalultrasound Biopsy

Simulation of Ultra-slow Oscillations Using the Integrate and Fire Neuron Model

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Engineering（科研） 2012年第10期4卷 65-67页

作者： Danny ng MokSiew -Ying Chan Siow -Cheng Goh sing -Yau Department of Mechanical and Material Engineering University Tunku Abdul Rahman UTAR Kuala Lumpur Malaysia Department of Mechatronics and BioMedical Engineering University Tunku Abdul Rahman UTAR Kuala Lumpur Malaysia

The Integrate and Fire (IF) neuron model wasusedto simulate ultra-slow oscillations that were observed in cortical cultures. Simulation of a network with 2 sub-networks is conducted in this study. We introduced an additional equation that governs the generation and dissipation of an inhibitory property to each of the ***-networks that fire at different rate are generated from the simulation. The network activity from the simulation oscillates at frequencies that are comparable to ultra-slow oscillations observed in cortical cultures.

关键词： Integrate and Fire Neurons Ultra-slow Oscillation Simulation

Decomposition and Reformulation of Banxia Baizhu Tianma Decoction:A Vasodilatory Approach

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Chinese Herbal Medicines 2017年第2期9卷 134-146页

作者： Chu Shan Tan Yean Chun Loh Yung sing Ch'ng Mariam Ahmad Mohd.Zaini Asmawi Mun Fei Yam Department of Pharmacology School of Pharmaceutical SciencesUniversiti Sains Malaysia College of Pharmacy Fujian University of Traditional Chinese Medicine

Objective To decompose and reformulate Banxia Baizhu Tianma Decoction（BBT） in order to optimize its ratio for vasodilatory *** fingerprints of these six component herbs were also studied via Tri-step FTIR *** The herbal components of BBT were extracted separately with different solvents,such as 95%ethanol,50%ethanol,and distilled *** vasodilatory effect of the extracts was studied using the in vitro pre-contracted aortic ring *** these extracts,the water extracts of Pinellia ternata[PT（W）]and Citri reticulatae[CR（W）],50%ethanol extracts of Castrodia elata[GE（50）]and Clycyrrhiza uralensis[GU（50）],and 95%ethanol extracts of Atractylodes macrocephala[AM（E）],and Poria cocos[PC（E）]were selected for the orthogonal stimulus-response compatibility group study due to their high effectiveness in *** The best combination ratio（G2） was GE（50）,GU（50）,AM（E）,PC（E）,CR（W）,and PT（W） at EC0,EC5,EC5,EC5,EC5,and EC5,with EC50 of（0.06 ± 0.01） mg/*** between the vasodilatory effects of extracts derived from G2 and BBT were also *** the results,the 50%ethanol extract following G2 ratio was found to be most potent extract with the highest vasodilatory effect compared with other extracts derived from G2 or BBT,with EC50 of（0.05 ±0.005） mg/*** The optimum ratio and appropriate extraction method for the new BBT formulae are obtained.G2 is determined as the best formulae with the highest potency in producing the vasodilatory effect on isolated rat aortic *** results obtained suggest that 50%ethanol is found to be the best solvent to extract the vasoactive compounds of G2 in order to exhibit the highest efficacy of vasodilatory effect.

关键词： Banxia Baizhu Tianma Decoction compatibility group study reformulation traditional Chinese medicine Tri-step FTIR vasodilation assay

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柔性版印刷中的混合加网技术

中国印刷与包装研究 2009年第3期1卷 70-72页

作者： Hsieh Yung-Cheng ng Vin sing 汤文杰 Department of Graphic Communication Arts National Taiwan University Pan-Chiao City

本课题通过研究柔版印刷中不同混合加网技术对印品质量的影响,获得了针对CTP制版柔版印刷的最优混合加网技术。实验采用了柔性版印刷中11种不同比例组合的混合加网技术(FM-AM-FM),在PVC基片上印制特别设计的色表。通过对色表的测试以及... 详细信息

本课题通过研究柔版印刷中不同混合加网技术对印品质量的影响,获得了针对CTP制版柔版印刷的最优混合加网技术。实验采用了柔性版印刷中11种不同比例组合的混合加网技术(FM-AM-FM),在PVC基片上印制特别设计的色表。通过对色表的测试以及网点静态分析,以获得最优混合加网的组合。希望本实验得到的最优混合加网组合的数据能为柔性版印刷商更好地了解不同加网技术的特点提供帮助,通过选择加网技术提高印刷质量,获得更高的客户满意度。

关键词：柔版印刷调幅加网调频加网混合加网印刷属性