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A Hf-doped dual-phase high-entropy alloy: phase evolution and wear features

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Rare Metals 2024年第1期43卷 324-333页

作者： Hao Ren Rui-Run Chen Xue-Feng Gao Tong Liu Gang Qin Yu-Lung chiu Shi-Ping Wu Jing-Jie Guo national Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Metallurgy and Materials University of BirminghamEdgbastonBirmingham B152TTUK

Initially defined high entropy alloys(HEAs)usually exhibit a single-phase solid-solution ***,two and/or more types of phases in HE As possibly induce the desired microstructure features,which contribute to improving the wear properties of HE ***,we prepare a series of(AlCoCrFeni)_(100-x)Hf_(x)(x=0,2,4and 6;at%) HEAs and concern their phase compositions,micro structures and wear *** leads to the formation of(ni,Co)_(2)Hf-type Laves phase and tailors the microstructure from a body-centered cubic(BCC) singlephase structure to a hypoeutectic *** increased hardness from~HV 512.3 to~HV 734.1 is due to solid-solution strengthening,grain refinement strengthening and precipitated phase *** a few oxides(Al_(2)O_(3)+Cr_(2)O_(3)) caused by the wear heating contribute to an 85.5% decrease in wear rate of the HEA system from6.71×10^(-5) to 0.97×10^(-5) m^(3)·n^(-1)·m^(-1).In addition,Hf addition changes the wear mechanism from abrasive wear,mild oxidative wear and adhesive wear to oxidative wear and adhesive wear.

关键词： High entropy alloy Laves phase Hardness Wear mechanism

The role ofγ-C2H5nO2 as a new transient liquid phase in cold sintering process of BaTiO3 composites

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Journal of Advanced Ceramics 2024年第7期13卷 942-955页

作者： Jitrawan noisak Pimchanok Ieamviteevanich Thitirat Charoonsuk Phakkhananan Pakawanit nattapong Pinpru Wanwilai Vittayakorn Tosapol Maluangnont Panpailin Seeharaj Theerachai Bongkarn Te-Wei chiu naratip Vittayakorn Advanced Materials Research Unit School of ScienceKing Mongkut’s Institute of Technology LadkrabangBangkok 10520Thailand Department of Chemistry School of ScienceKing Mongkut’s Institute of Technology LadkrabangBangkok 10520Thailand Department of Materials Science Faculty of ScienceSrinakharinwirot UniversityBangkok 10110Thailand Synchrotron Research and Applications Division Synchrotron Light Research InstituteNakhon Ratchasima 30000Thailand Sustainability Centre Plastics Market Intelligent DepartmentPlastics Institute of ThailandBangkok 10110Thailand Electroceramics Research Laboratory College of Materials Innovation and TechnologyKing Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand Department of Physics Faculty of ScienceNaresuan UniversityPhitsanulok 65000Thailand Research Center for Academic Excellence in Applied Physics Faculty of ScienceNaresuan UniversityPhitsanulok 65000Thailand Department of Materials and Mineral Resources Engineering "National"Taipei University of TechnologyTaipei 106TaiwanChina

Dielectric materials,such as barium titanate(BT)-based materials,have excellent dielectric properties but require high temperatures(above 1300℃)for ceramic fabrication,leading to high costs and energy *** cold sintering process(CSP)offers a solution to these issues and is gaining worldwide attention as an innovative fabrication *** this work,we proposed an alternative organic ferroelectric phase,gamma-glycine(γ-GC),which acts as a transient liquid phase to fabricate high-density composites with barium titanate(BT)at low temperatures through *** findings show that the density of 15γ-GC/85BT reached 96.7%±1.6%when it was sintered at 120℃for 6 h under 10 MPa uniaxial *** electron microscopy‒energy dispersive X-ray spectroscopy(SEM‒EDS)mappings of the composite suggested thatγ-GC completely underwent the precipitation-dissolution process and,therefore,filled between BT ***,X-ray diffraction(XRD)and Fourier-transform infrared spectroscopy(FTIR)confirmed the preservation ofγ-GC without undesired phase *** addition,the ferroelectric and dielectric properties ofγ-GC/BT composites have been *** high dielectric constant(εr)was 3600,and the low dielectric loss(tanδ)was 1.20 at 200℃and 100 kHz for the 15γ-GC/85BT *** hysteresis loop showed a remanent polarization(Pr)of 0.55µC·cm^(−2)and a coercive field(Ec)of 7.25 kV·cm^(−1).Our findings reaffirmed that an organic ferroelectric material(γ-GC)can act as a transient liquid phase in a CSP that can successfully and sustainably fabricateγ-GC/BT composites at low temperatures while delivering outstandingly high performance.

关键词： gamma-glycine(γ-GC) barium titanate(BT) cold sintering process organic ferroelectric materials dielectric properties ferroelectric properties

Organoids as a model to study the human endometrium

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Reproductive and Developmental Medicine 2022年第4期6卷 215-224页

作者： Jianlin Li Leqian Lin Jiangming Zhong Xintong Li Cheuklun Lee Philip C.n.chiu Department of Obstetrics and Gynaecology LKS Faculty of MedicineThe University of Hong Kong21 Sassoon RoadPokfulamHong KongChina

The endometrium is composed of glandular and luminal epithelia supported by stromal connective tissue and multiple other cell *** is a dynamic organ that undergoes physiological and functional alteration during the menstrual *** resemble the primary tissue of origin to recapitulate their corresponding biological and pathological *** are known for their ability to undergo extensive expansion while maintaining their genomic stability,facilitating their long-term storage and high-throughput *** development of the three-dimensional endometrial organoid system,which recapitulates the structural and functional characteristics of the endometrial glands,provides a powerful tool to study the normal endometrium and its related *** Web of Science was searched for relevant literature using the keywords"endometrium","endometrial gland","organoid",and"culture model";a total of 134 articles were *** this review,the characteristics,applications,and limitations of endometrial epithelial organoids are discussed.

关键词： Endometrial gland Endometrium Epithelial cell Estrous cycle Organoid Three-dimensional culture model

ELECTROHYDRODYnAMIC DISPERSIOn OF DEFORMABLE AEROSOLS In THE PRESEnCE OF An ELECTRIC FIELD AnD CHEMICAL REACTIOn USInG TAYLOR DISPERSIOn MODEL

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Journal of Hydrodynamics 2011年第2期23卷 247-257页

作者： RUDRAIAH n. DEVARAJU n. nG chiu-On UGC-CAS in Fluid Mechanics Department of Mathematics Bangalore University Bangalore-560 001 India National Research Institute for Applied Mathematics (NRIAM) Bangalore-560 070 India Department of Mechanical Engineering The University of Hong Kong

Under the effects of electric field and chemical reaction, the problem of dispersion of aerosols in a poorly conducting fluid in a channel is solved analytically using the mixture theory together with a regular perturbation technique. It is shown that the aerosols are dispersed relative to a plane moving with the mean speed of atmospheric fluid as well as the mean speed of agglomeration of aerosol with a relative diffusion coefficient, called the Taylor dispersion coefficient. This coefficient is numerically computed and the results reveal that it increases with an increase in the electric number, but decreases with increasing porous parameter. The physical explanations for the phenomena are given in this article.

关键词： dispersion aerosols electrohydrodynamics mixture theory

Versatile sensing devices for self-driven designated therapy based on robust breathable composite films

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nano Research 2022年第2期15卷 1027-1038页

作者： Zhaofeng Ouyang Songbo Cui Houyong Yu Dewen Xu Chuang Wang Dongping Tang Kam chiu Tam Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of EducationSchool of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of WaterlooWaterlooON N2L 3G1Canada

Flexible wearable electronics were developed for applications such as electronic skins,human-machine interactions,healthcare monitoring,and anti-infection *** conventional materials showed impermeability,single sensing ability,and no designated therapy,which hindered their *** it was still a great challenge to develop electronic devices with multifunctional sensing properties and self-driven anti-infection ***,flexible and breathable on-skin electronic devices for multifunctional fabric based sensing and self-driven designated anti-infection therapy were prepared successfully with cellulose nanocrystals/iron(Ⅲ)ion/polyvinyl alcohol(CnC/Fe^(3+)/PVA)*** resultant composite films possessed robust mechanical performances,outstanding conductivity,and distinguished breathability(3.03 kg/(m^(2)·d)),which benefited from the multiple interactions of weak hydrogen bonds and Fe^(3+) chelation and synergistic effects among CnC,polyaniline(PAnI),and ***,the film could be assembled as a multifunctional sensor to actively monitor real-time physical and infection related signals such as temperature,moisture,pH,nH3,and human movements even at sweat *** importantly,this multifunctional device could act as a self-driven therapist to eliminate bacterial by the release of Fe^(3+),which was driven by the damage of metal coordination Fe-O bonds due to the high temperature caused by infection at wound ***,the composite films had potential versatile applications in electronic skins,smart wound dressings,human-machine interactions,and self-driven anti-infection therapy.

关键词： cellulose nanocrystals polyvinyl alcohol composite films mechanical performances

Role of microRnAs in embryo–endometrial interactions:biological functions and clinical applications

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Reproductive and Developmental Medicine 2023年第4期7卷 238-251页

作者： Shiwen Qi Suranga P.Kodithuwakku Ronald T.K.Pang Philip C.n.chiu Mary H.Y.Tang Kai-Fai Lee Department of Obstetrics and Gynaecology School of Clinical MedicineLKs Faculty of MedicineThe University of Hong KongHong Kong SARChina Department of Animal Science Faculty of AgricultureUniversity of PeradeniyaPeradeniya 20400Sri Lanka Shenzhen Key Laboratory of Fertility Regulation The University of Hong Kong-Shenzhen HospitalShenzhenGuangdongChina.

The human endometrium and embryo both produce microRnAs(miRnAs),which are involved in various physiological *** evident suggested that endometrial miRnAs are regulated by steroid hormones that modulate endometrial functions,whereas embryo-derived miRnAs play vital roles in maternal–embryo *** aberrant expression of endometriumor embryo-derived miRnAs can cause early pregnancy and gestational disorders,including repeated implantation failure,recurrent miscarriage,and pathological conditions such as *** are,therefore,ideal candidates for conducting clinicopathological *** diagnostic and prognostic tests using miRnAs are under development;however,the therapeutic applications of miRnAs in regulating gestational disorders require further investigation.

关键词： MicroRnAs Endometrial receptivity Diagnostic biomarkers Therapeutic targets

Learning of medical pharmacology via innovation:a personal experience at McMaster and in Asia

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Acta Pharmacologica Sinica 2004年第9期25卷 84-92页

作者： chiu-yin KWAn Canada Department of Medicine HSC-4n40 Faculty of Health Sciences Hamilton L8n 3Z5 McMaster University Ontario

Pharmacology in the traditional medical curriculum has been treated as a discrete "preclinical" discipline identifying itself distinctly different from the other preclinical sciences or clinical subjects in knowledge base as well as learning/teaching instructions. It is usually run in series with other pre-clinical courses (eg, anatomy, biochemistry, physiology etc), but in parallel with other paraclinical courses such as pathology, microbiology and community medicine. Clinical pharmacology was only introduced relatively recently designed to overcome the perceived deficiency in "preclinical" pharmacology regarding its therapeutic relevance and application to medicine. In many universities, both preclinical and clinical pharmacology courses co-exist, usually independently offered by two separate, sometimes non-interacting Departments of Pharmacology and Clinical Pharmacology. In this model, pharmacology is generally taught in a teacher-centered, discipline-oriented, and knowledge-based curriculum. Further

关键词： problem-based learning pharmacology medical education self-directed learning small group tutorial

Robust,Breathable and Flexible Smart Textiles as Multifunctional Sensor and Heater for Personal Health Management

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Advanced Fiber Materials 2023年第1期5卷 282-295页

作者： Dewen Xu Zhaofeng Ouyang Yanjuan Dong Hou‑Yong Yu Shuang Zheng Shenghong Li Kam chiu Tam Key Laboratory of Intelligent Textile and Flexible Interconnection of Zhejiang Province Zhejiang Sci-Tech UniversityXiasha Higher Education Park Avenue 2 No.928Hangzhou 310018China Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooON N2L 3G1Canada

Smart textiles with high sensitivity and rapid response for various external stimuli have gained tremendous attentions in human healthcare monitoring,personal heat management,and wearable ***,the current smart textiles only acquire desired signal passively,regularly lacking subsequent on-demand therapy ***,a robust,breathable,and flexible smart textiles as multi-function sensor and wearable heater for human health monitoring and gentle thermotherapy in real time is *** composite fiber as strain sensor(CFY@PU)was fabricated via warping carbon fiber yarns(CFY)onto polyurethane fibers(PU),which endowed composite fiber with high conductivity,excellent sensitivity(GF=76.2),and fantastic dynamic durability(7500 cycles)in strain *** addition,CFY@PU can detect various degrees of human movements such as elbow bending,swallowing and pulse,which can provide effective information for disease *** surprisingly,weaving CFY@PU into a fabric can assemble highly sensitive pressure sensor for remote communication and information *** CFY onto Kevlar would obtain temperature-sensitive composite fiber(CFY@Kevlar)as temperature sensor and wearable heater for on-demand thermotherapy,which provided unique opportunities in designing smart textiles with ultrahigh sensitivity,rapid response,and great dynamic durability.

关键词： Smart textiles Carbon fiber yarns Multifunctional sensor Personal heat management Wearable electronics

Flexible,anti-damage,and non-contact sensing electronic skin implanted with MWCnT to block public pathogens contact infection

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nano Research 2022年第3期15卷 2616-2625页

作者： Duan-Chao Wang Hou-Yong Yu Lurong Jiang Dongming Qi Xinxing Zhang Lumin Chen Wentao Lv Weiqiang Xu Kam chiu Tam national Engineering Lab for Textile Fiber Materials&Processing Technology College of Textile Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China College of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

If a person comes into contact with pathogens on public facilities,there is a threat of contact(skin/wound)*** urgently,there are also reports about COVID-19 coronavirus contact infection,which once again reminds that contact infection is a very easily overlooked disease exposure ***,we propose an innovative implantation strategy to fabricate a multi-walled carbon nanotube/polyvinyl alcohol(MWCnT/PVA,MCP)interpenetrating interface to achieve flexibility,anti-damage,and non-contact sensing electronic skin(E-skin).Interestingly,the MCP E-skin had a fascinating non-contact sensing function,which can respond to the finger approaching 0−20 mm through the spatial weak *** non-contact sensing can be applied urgently to human–machine interactions in public facilities to block *** scratches of the fruit knife did not damage the MCP E-skin,and can resist chemical corrosion after hydrophobic *** addition,the MCP E-skin was developed to real-time monitor the respiratory and cough for exercise detection and disease ***,the MCP E-skin has great potential for emergency applications in times of infectious disease pandemics.

关键词： prevent contact infection anti-damage sensors non-contact sensing respiratory sensing human–machine interaction