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Journal of Magnesium and Alloys 2021年第5期9卷 1594-1610页

作者： Hui Fang chenxi wang Shicheng Zhou Ge Li Yanhong Tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Collaborative Research Center Meisei UniversityHinoTokyo 191-8506Japan

To expand the future clinic applications of biodegradable magnesium alloy,polymer coatings with excellent biocompatibility are the keys to solve the local alkalinity and rapid hydrogen ***-organic silk fibroin provides an approach to fabricate a protective coating on biomedical Mg-Zn-Ca alloy,however,the adhesion force and mechanical properties of the coating on substrates are ought to be further improved without any chemical conversion/intermediate ***,based on VUV/O;surface activation,a hybrid of silk fibroin and sodium alginate is proposed to enhance the adhesion force and mechanical properties of the composite coatings on hydrophilic Mg-Zn-Ca alloy *** mass ratios of sodium alginate addition were investigated to achieve the optimum coating *** nanoscratch test and nanoindentation test confirmed that the adhesion force was tripled and mechanical properties index was significantly improved when the mass ratio of silk fibroin/sodium alginate was 70/30 compared to pure silk fibroin or sodium alginate ***,the corrosion rate of the coated Mg-Zn-Ca alloy was significantly delayed with the addition of sodium alginate,resulting in a reaction layer during corrosion ***,the mechanisms for both adhesion and corrosion processes were discussed in *** findings offer more possibilities for the controllable surface performance of degradable metals.

关键词： Mg-Zn-Ca alloy Silk fibroin Sodium alginate Adhesion force Mechanical property Corrosion resistance

Structure evolution of Y2O3 nanoparticle/Fe composite during mechanical milling and annealing

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Progress in Natural Science:Materials International 2013年第4期23卷 434-439页

作者： Tong Liu Hailong Shen chenxi wang Wusheng Chou Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and EngineeringBeihang University School of Mechanical Engineering and Automation Beihang University

Fe-25 wt% Y2O3composite powders have been fabricated by mechanical milling(MM) Fe powders of 100 μm in diameter and Y2O3nanoparticles in an argon atmosphere for the milling periods of4,8,12,24,36,and 48 h,*** features of these powders were characterized by using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron probe micro analyzer(EPMA) and transmission electron microscopy(TEM).The experimental results showed that the mean particle size and crystalline size of MM powders decreased with the milling time *** the elements distributed homogenously inside the powders after 48 h of *** lattice constant of the matrix α-Fe kept constant with the milling time,and no solid solution took place during MM *** 8 h of MM,the α-Fe in each powder became *** 48 h of MM,Y2O3changes from nanostructure into amorphous structure,and the crystalline size of α-Fe further decreased to 10 *** Y2O3in the powders mechanically milled for 48 h kept the amorphous structure after being annealed at 400 1C,and starts to crystallize when the powders are annealed at 600 *** amorphous Y2O3contains a small amount of Fe,and crystalline FeYO3appears at 800 1C.

关键词： Y2O3 nanoparticles Oxide dispersion strengthened composite Mechanical milling Amorphous structure

Metal-organic framework-derived CoSn/NC nanocubes as absorbers for electromagnetic wave attenuation

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Journal of Materials Science & Technology 2022年第13期108卷 236-243页

作者： chenxi wang Zirui Jia Shuangqiao He Jixi Zhou Shuo Zhang Mengli Tian Bingbing wang Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Weihai Innovation Institute Qingdao UniversityWeihai 264200China

Metal-organic framework-derived composites have been widely used in electromagnetic wave(EMW)absorption,but the traditional synthetic strategy greatly limits the structure and species of *** research provided a solvent-free method to synthesize Co-MOF and its *** CoSnO_(3)as the precursor,the preparation of Co-MOF is achieved by bridging the cobalt(II)ion of CoSnO_(3)and the 2-methylimidazole *** CoSn/N-doped carbon(CoSn/NC)composites derived from CoSnO_(3)-MOF(Co-MOF with CoSnO_(3)as Co source)retain the original morphology of CoSnO_(3).Besides,the polarization effect produced by the N-doped carbon layers also benefits the excellent EMW absorption performance of the CoSn/NC *** is reflected in the minimum reflection loss(RL)of-48.2 dB at 2.2 mm and the effective bandwidth(EBA)of 5.84 *** work provides a new channel to the construction of Co-MOFs,which could be extended to other Co-based oxides and vastly expand the species of MOFs based on metallic Co.

关键词： Hollow nanocubes structure N-doped carbon CoSnO_(3)-MOF Electromagnetic wave absorption

Corrosion behavior of ferritic ODS steel prepared by adding YH2 nanoparticles in supercritical water at 600 °C

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Progress in Natural Science:Materials International 2018年第4期28卷 505-509页

作者： Zhonglian Bai Linbo wang chenxi wang Wenhua Gao Lefu Zhang Tong Liu Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beihang University School of Nuclear Science and Engineering Shanghai Jiao Tong University

The corrosion behavior of the ferritic oxide dispersion strengthened(ODS)steel(14Cr-3Al-2W-0.1Ti)prepared by adding YH2nanoparticles(NPs)was investigated in supercritical water(SCW)at 600°C for 1500 *** mass gain of the ODS steel(215.5 mg/dm~2)was lower than that of SUS430 steel(357.2 mg/dm~2).A dual oxide layer generated on the surface of ODS steel after corrosion in *** outer layer was composed of Fe2O3and Fe3O4,while the inner layer composed of the spinel-type FeCr2O4together with *** generation of Y2Ti2O7NPs in the ODS steel by adding YH2NPs prohibits the formation of Y-Al-O particles and leaves more Al available to form a continuous protective oxide scale to improve the corrosion ***,the Y2Ti2O7NPs act as efficient barriers to suppress the outward diffusion of metal *** novel ODS steel shows potential applications in supercritical water.

关键词： Supercritical water ODS steel Corrosion behavior Microstructure

One-step PDA coating strategy on pure Zn for blood-contacting engineering

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Journal of Materials Science & Technology 2022年第28期123卷 78-91页

作者： Xiaoyun Qi Shicheng Zhou Hui Fang Shuhan Yang Chunjin Hang Yanhong Tian chenxi wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The mechanical performance degradation caused by pitting corrosion and the insufficient biocompatibility induced with ion release inhibit the application of Zn as the new biodegradable metallic materials for blood-contacting intervention *** work successfully coats a uniform polydopamine(PDA)layer on pure Zn via a one-step deposition process without introducing heavy metal elements or detrimental *** corrosion resistance and uniform corrosion have been performed on PDA coated Zn with corrosion products and pits reduced significantly than pure Zn during in vitro *** could be prohibited by anticoagulation performance with prothrombin time and activated partial thromboplastin time prolonged after co-incubation,and an almost 40%decrease of platelets adhesion,indicating the improved blood compatibility of coated ***,the poly(lactic-co-glycolic acid)(PLGA)is filmed on PDA coated Zn to realize a smooth double-coated structure with superior mechanical performance under stress loading to stably serve the multifunctional application,such as drug *** strategy not only represents a facile and biological friendly method for Zn surface modification but also puts forward new ideas on preparing PDA-based coatings on active biodegradable alloys,which are beneficial for better blood-contacting engineering.

关键词： Biodegradable Pure Zn Uniform corrosion Blood compatibility Doubled-coated structure

Local probing of the non-uniform distribution of ferrielectric and antiferroelectric phases

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Nano Research 2023年第2期16卷 3021-3027页

作者： Huimin Qiao Fangping Zhuo Zhen Liu Jinxing wang Jeongdae Seo chenxi wang Jinho Kang Bin Yang Yunseok Kim School of Advanced Materials and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Research Center for Advanced Materials Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany Department of Physics College of ScienceNortheast Forestry UniversityHarbin 150040China Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Piezoresponse force microscopy(PFM)is an indispensable tool in the investigation of local electromechanical responses and polarization *** acquired data provide spatial information on the local disparity of polarization switching and electromechanical responses,making this technique advantageous over macroscopic *** its widespread application in ferroelectrics,it has rarely been used to investigate the ferrielectric(FiE)behaviors in antiferroelectric(AFE)***,the PFM was utilized to study the local electromechanical behavior and distribution of FiE,and the AFE phases of PbZrO_(3)thin-film were studied,where only the FiE behavior is observable using a macroscopic *** FiE region resembles a ferroelectric material at low voltages but exhibits a unique on-field amplitude response at high *** contrast,the AFE region only yields an observable response at high ***-field simulations reveal the coexistence of AFE and FiE states as well as the phase-transition processes that underpin our experimental *** work illustrates the usefulness of PFM as an analytical tool to characterize AFE/FiE materials and their phase-coexistence behavior,thereby providing insights to guide property modification and potential applications.

关键词： scanning probe microscopy ferrielectrics antiferroelectrics local electromechanical response

Recycled low-temperature direct bonding of Si/glass and glass/glass chips for detachable micro/nanofluidic devices

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Journal of Materials Science & Technology 2020年第11期42卷 156-167页

作者： chenxi wang Hui Fang Shicheng Zhou Xiaoyun Qi Fanfan Niu Wei Zhang Yanhong Tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin J50001China School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyCuilin 541004China Collaborative Research Center Meisei UniversityTokyo 191-8506Japan Department of Precision Engineering School of EngineeringThe University of TokyoBunkyoTokyo 113-8656Japan

Silicon and glass are two of the most ideal materials for micro/nanofluidic devices,which have been widely used for research in multidisciplinary ***,many micro/nanofluidic devices enable only single use due to the irreversible bonding between Si/glass or glass/glass *** the silicon-and glass-based devices are fabricated to be detachable,the substrates can be reused and bonded again without repeating expensive micro/nanofabrication ***,we present a recycled direct bonding method for Si/glass and glass/glass chips based on oxygen plasma activation and low-temperature annealing *** bonding strength and void-free bonding interface are obtained after annealing at 150℃.The surfaces and the bonding interfaces are characterized to elucidate the bonding ***,immersion tests are carried out to investigate the interfacial corrosion resistance in various chemical and biological solutions as well as explore a detachable *** bonding strengths are controlled to meet the demand for micro/nanofluidic devices and the bonding interfaces can be separated in *** a result,we succeed in the experiment of bonding and detaching of glass substrates without fracturing,which is repeated for three times.

关键词： Low-temperature bonding Plasma activation Interface Corrosion Detachable

Design,preparation and measurement of protein/CNTs hybrids:A concise review

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Journal of Materials Science & Technology 2020年第11期42卷 74-87页

作者： Xing Zhou Jian Su chenxi wang Changqing Fang Xinyu He Wanqing Lei Chaoqun Zhang Zhigang Huang Faculty of Printing Packaging Engineering and Digital Media TechnologyXi'an University of TechnologyXi'an710048China School of Materials Science and Engineering Xi'an University of TechnologyXi'an710048China School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an710048China College of Materials and Energy South China Agricultural UniversityGuangzhou510642China School of Materials Science and Mechanical Engineering Beijing Technology and Business UniversityBeijing100048China

With the development of nanobiotechnology,the carbon nanotubes(CNTs)and protein hybrids system has attracted an increasing attention for great potential application in nanotechnology,medicine,smart materials,light industry,and *** this review,the main preparation processes,impact factors,measurement of interactions and potential applications of CNTs/protein are presented from the aspect of ***,the proper forces detection methods are illustrated comprehensively to complete the quantitative *** force microscope(AFM)and surface force apparatus(SFA)experiments are described in detail to confirm the powerful function in measuring the interaction *** addition,the impact of different protein structures(amino acid residues,αHelix,polypeptide chain,and assembled subunits)on interactions between CNTs and protein is presented and different amino acid residues may intervene largely on *** to the relatively little knowledge about the structure,function,and spatial orientation of proteins interaction with CNTs surface,we assume that the key problem is how to prepare CNTs and protein specimen with unique structure(such as the variation of secondary and tridimensional structure of protein or the single CNTs)to investigate the interaction forces instead of the designed,preparation,and detection methods.

关键词： Assembly Carbon nanotubes(CNTs) Hybrid composites Protein adsorption Interaction

Adaptive probabilistic load forecasting for individual buildings

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iEnergy

iEnergy 2022年第3期1卷 341-350页

作者： chenxi wang Dalin Qin Qingsong Wen Tian Zhou Liang Sun Yi wang Department of Electrical and Electronic Engineering The University of Hong KongHong Kong SARChina DAMO Academy Alibaba Group(U.S.)Inc.BellevueWA 98004USA DAMO Academy Alibaba GroupHangzhou 310023China

Building-level load forecasting has become essential with the support of fine-grained data collected by widely deployed smart *** acts as a basis for arranging distributed energy resources,implementing demand response,*** to aggre-gated-level load,the electric load of an individual building is more stochastic and thus spawns many probabilistic forecasting *** of them resort to artificial neural networks(ANN)to build forecasting ***,a well-designed forecasting model for one building may not be suitable for others,and manually designing and tuning optimal forecasting models for various buildings are tedious and *** paper proposes an adaptive probabilistic load forecasting model to automatically generate high-performance NN structures for different buildings and produce quantile forecasts for future ***,we cascade the long short term memory(LSTM)layer with the adjusted Differential ArchiTecture Search(DARTS)cell and use the pinball loss function to guide the model during the improved model fitting process.A case study on an open dataset shows that our proposed model has superior performance and adaptivity over the state-of-the-art static neural network ***,the improved fitting process of DARTS is proved to be more time-efficient than the original one.

关键词： Probabilistic load forecasting long short-term memory(LSTM) Differentiable neural ARchiTecture Search(DARTS) building load forecasting.

Transcriptome analysis of the effect of pyrroloquinoline quinone disodium（PQQ·Na2） on reproductive performance in sows during gestation and lactation

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Journal of Animal Science and Biotechnology 2019年第4期10卷 1022-1036页

作者： Boru Zhang chenxi wang Wei Yang Hongyun Zhang Qingwei Meng Baoming Shi Anshan Shan Institute of Animal Nutrition Northeast Agricultural University

Background: Pyrroloquinoline quinone(PQQ), which is a water soluble, thermo-stable triglyceride-quinone, is widely distributed in nature and characterized as a mammalian vitamin-like redox cofactor. The objective of this study was to investigate the effects of pyrroloquinoline quinone disodium(PQQ·Na2) on reproductive performance in ***: Dietary supplementation with PQQ·Na2 significantly increased the total number of piglets born, the number of piglets born alive and the born alive litter weight. It also increased the antioxidant status in the placenta, plasma and milk. The concentration of NO was significantly increased in the plasma and placenta. RNA-seq analysis showed that462 unigenes were differentially expressed between the control(Con) treatment and PQQ treatment *** these unigenes, 199 were upregulated, while 263 unigenes were downregulated. The assigned functions of the unigenes covered a broad range of GO categories. Reproduction(27, 7.03%) and the reproduction process(27, 7.03%) were assigned to the biological process category. By matching DEGs to the KEGG database, we identified 29 ***: In conclusion, dietary supplementation with PQQ·Na2 in gestating and lactating sows had positive effects on their reproductive performance.

关键词： Oxidative stress Pyrroloquinoline quinone Pyrroloquinoline quinone disodium Reproductive performance,RNA-seq Sow