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Journal of Materials Science & Technology 2024年第4期171卷 222-234页

作者： Yufan Li Li Chen Yijing Stehle Mingyue Lin Chenxin Wang Rui Zhang Min Huang Yubao Li Qin Zou Research center for Nano Biomaterials Analytical&Testing CenterSichuan UniversityChengdu 610064China analytical&Testing center Sichuan UniversityChengdu 610064China Department of mechanical engineering Union College807 Union St.SchenectadyNY 12308USA Sichuan Institute of Atomic Energy Chengdu 610101China

Three-dimensional(3D)bioprinting,specifically direct ink writing(DIW)capable of printing biologically active substances such as growth factors or drugs under low-temperature conditions,is an emerging di-rection in bone tissue engineering.However,limited by the bio-ink mobility and the poor resolution of this printing technology,the lateral pores of current crisscross-stacked scaffolds printed through DIW tend to clog and are inimical to bone growth.Therefore,it is critical to develop DIW printed biologi-cal scaffold structure with high mechanical strength,porosity,and biocompatibility performance.Herein,patterned polylactic acid(PLA)/polycaprolactone(PCL)/nano-hydroxyapatite(n-HA)based scaffold was printed through DIW technological and rolled-up for properties characterization,cytocompatibility test,and bone repair experiment.The result not only shows that the hexagonal patterned scaffolds are me-chanically strong with porosity,but also demonstrated that the hierarchical pore structure formed during rolled-up has the potential to address the clogging problem and stimulates bone growth and repair.

关键词： Direct ink writing(DIW) Bone repair scaffold,Micro-CT Bio composites

Thermo-kinetic characteristics on stabilizing hetero-phase interface of metal matrix composites by crystal plasticity finite element method

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Journal of Materials Science & Technology 2024年第2期169卷 53-67页

作者： Y.B.Zhang S.J.Song F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China analytical&Testing center Northwestern Polytechnical UniversityXi’an 710072China

Using dislocation-based constitutive modeling in three-dimension crystal plasticity finite element(3D CPFE)simulations,co-deformation and instability of hetero-phase interface in different material systems were herein studied for polycrystalline metal matrix composites(MMCs).Local stress and strain fields in two types of 3layer MMCs such as fcc/fcc Cu-Ag and fcc/bcc Cu-Nb have been predicted under simple compressive deformations.Accordingly,more severe strain-induced interface instability can be observed in the fcc/bcc systems than in the fcc/fcc systems upon refining to metallic nanolayered composites(MNCs).By detailed analysis of stress and strain localization,it has been demonstrated that the interface instability is always accompanied by high-stress concentration,i.e.,thermodynamic characteristics,or high strain prevention i.e.,kinetic characteristics,at the hetero-phase interface.It then follows that the thermodynamic driving forceG and the kinetic energy barrier Q during dislocation and shear banding can be adopted to classify the deformation modes,following the so-called thermo-kinetic correlation.Then by inserting a high density of high-energy interfaces into the Cu-Nb composites,such thermo-kinetic integration at the hetero-phase interface allows a successful establishment of MMCs with the high△G-high Q deformation mode,which ensures high hardening and uniform strain distri-bution,thus efficiently suppressing the shear band,stabilizing the hetero-phase interface,and obtaining an exceptional combination in strength and ductility.Such hetero-phase interface chosen by a couple of thermodynamics and kinetics can be defined as breaking the thermo-kinetic correlation and has been proposed for artificially designing MNCs.

关键词： Thermodynamics and kinetics Physics-based constitutive modeling Hetero-phase interface Crystal plasticity finite element

Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1089-1097页

作者： Jianjun Xu Hanlin Ding Xin Lin Feng Liu analytical&Testing center Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

The microstructure characteristics and strengthening mechanism of Inconel738LC(IN-738LC) alloy prepared by using induction-assisted directed energy deposition(IDED) were elucidated through the investigation of samples subjected to IDED under 1050℃ preheating with and without hot isostatic pressing(HIP,1190℃,105 MPa,and 3 h).Results show that the as-deposited sample mainly consisted of epitaxial columnar crystals and inhomogeneously distributed γ’ phases in interdendritic and dendritic core regions.After HIP,grain morphology changed negligibly,whereas the size of the γ’ phase became increasingly even.After further heat treatment(HT,1070℃,2 h + 845℃,24 h),the γ’ phase in the as-deposited and HIPed samples presented a bimodal size distribution,whereas that in the as-deposited sample showed a size that remained uneven.The comparison of tensile properties revealed that the tensile strength and uniform elongation of the HIP + HTed sample increased by 5% and 46%,respectively,due to the synergistic deformation of bimodal γ’phases,especially large cubic γ’ phases.Finally,the relationship between phase transformations and plastic deformations in the IDEDed sample was discussed on the basis of generalized stability theory in terms of the trade-off between thermodynamics and kinetics.

关键词： directed energy deposition Ni-based superalloys high-temperature preheating hot isostatic pressing microstructure tensile properties

Dynamic Measurement of Intracellular pH Based on Bioluminescent Bacteria

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Chemical Research in Chinese Universities 2024年第2期40卷 287-292页

作者： LI Yaohua WANG Wei State Key Laboratory of analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringChemBIC(Chemistry and Biomedicine Innovation Center)Nanjing UniversityNanjing210023P.R.China

Intracellular pH(pHi)is a fundamental indicator of cellular physiological state,regulating cellular state and function,and has important research values.Although various probes for measuring intracellular pH were available,it is challenging to reflect pHi in real-time and reversible manners.Herein,we developed a whole-cell bioluminescent(BL)probe based on wild type BL bacteria,photobacterium phosphoreum(P.phosphoreum),to determine and image pHi.The dependence of BL intensity of P.phosphoreum on pH values of culture solutions was established.It was found that BL intensity could respond to the change of pH values rapidly and reversibly.We further revealed that P.phosphoreum maintained pH homeostasis in the extracellular pH(pHe)within the range of 5.0–7.0,while intracellular pH homeostasis was destroyed at the alkaline pHe.This method opens up the enormous potential of BL bacteria as an alternative to fluorescence for monitoring and imaging pHi.

关键词： Bioluminescence P.phosphoreum Intracellular pH Cell imaging

3D时代:简单光化学方法实现无机纳米材料复杂3D结构打印

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Science Bulletin 2024年第8期69卷 997-999页

作者：姜秀娥 Research center for analytical Science College of ChemistryNankai UniversityTianjin 300071China

3D printing,or more formally known as additive manufacturing,is a collection of layer-by-layer approaches to assemble materials into freeform objects in 3D [1].Compared with traditional manufacturing technologies,it represents a disruptive process that benefits from the freedom in 3D structural designs and unlocks new material properties and device functionalities [1].These compelling capabilities render 3D printing attractive in fundamental research,industry,and our daily life,with applications ranging from rapid prototyping of customized products [2] to advanced engineering of biomedical implants [3],optics [4],and electronics[5].The past decade has witnessed the rapid progress of 3D printing in terms of new printing mechanism [2],more complex structures,and higher throughput [6].

关键词： printing render formally

Synthesis-temperature-dependent phase composition manipulation toward high thermoelectric performance in tetrahedrites

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Journal of Materials Science & Technology 2024年第1期168卷 124-130页

作者： Yiqing Wei Jiaqi Liu Zien Cheng Pengfei Jiang Zizhen Zhou Bin Zhang Guoyu Wang Guang Han Xu Lu Xiaoyuan Zhou center of Quantum Materials and Devices College of PhysicsChongqing UniversityChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China analytical and Testing center Chongqing UniversityChongqing 401331China

Tetrahedrite,an Earth-abundant natural mineral,has attracted extensive research interest because of its excellent thermoelectric performance.Herein,tetrahedrite samples comprising Cu-poor Cu_(12)Sb_(4)S_(13)and Cu-rich Cu_(14)Sb_(4)S_(13)phases have been synthesized using a colloidal method,in which the ratio of two phases is manipulated by controlling the synthesis temperature to improve the thermoelectric perfor-mance.It is found that an ultralow total thermal conductivity of∼0.3 W m^(−1)K^(−1)at 723 K is realized in the sample with a Cu-rich phase fraction of∼50%,which can be attributed to maximized phonon scattering by phase boundaries.As a result,combined with a decent power factor,this sample obtains an optimal zT of 1.15,which is about 85%higher than that of the sample with a Cu-rich phase fraction of∼64%and comparable to zT values of other eco-friendly,abundant Cu-based thermoelectric materials.This work demonstrates an effective synthesis-temperature-dependent phase composition manipulation strategy toward enhanced thermoelectric performance in tetrahedrites.

关键词： Tetrahedrite Thermoelectric Colloidal method Phase manipulation Thermal conductivity

Progress and prospects of Mg-based amorphous alloys in azo dye wastewater treatment

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Journal of Magnesium and Alloys 2024年第3期12卷 873-889页

作者： Yanan Chen Fengchun Chen Liang Li Chen Su Bo Song Hongju Zhang Shengfeng Guo Fusheng Pan School of Materials and Energy Southwest UniversityChongqing 400715China analytical and Testing center Southwest UniversityChongqing 400715China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Mg-based amorphous alloys exhibit efficient catalytic performance and excellent biocompatibility with a promising application probability,specifically in the field of azo dye wastewater degradation.However,the problems like difficulty in preparation and poor cycling stability need to be solved.At present,Mg-based amorphous alloys applied in wastewater degradation are available in powder and ribbon.The amorphous alloy powder fabricated by ball milling has a high specific surface area,and its reactivity is thousands of times better than that of gas atomized alloy powder.But the development is limited due to the high energy consumption,difficult and costly process of powder recycling.The single roller melt-spinning method is a new manufacturing process of amorphous alloy ribbon.Compared to amorphous powder,the specific surface area of amorphous ribbon is relatively lower,therefore,it is necessary to carry out surface modification to enhance it.Dealloying is a way that can form a pore structure on the surface of the amorphous alloys,increasing the specific surface area and providing more reactive sites,which all contribute to the catalytic performance.Exploring the optimal conditions for Mg-based amorphous alloys in wastewater degradation by adjusting amorphous alloy composition,choosing suitable method to preparation and surface modification,reducing cost,expanding the pH range will advance the steps to put Mg-based amorphous alloys in industrial environments into practice.

关键词： Mg-based amorphous alloys Azo dyes Dealloying Surface modification Wastewater degradation.

Recent Progress in Optical Sensors Based on MXenes Quantum Dots and MXenes Nanosheets

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Journal of Analysis and Testing 2024年第1期8卷 95-113页

作者： Chunxiao Lin Xinhong Song Weilan Ye Ting Liu Mingcong Rong Li Niu Guangzhou Key Laboratory of Sensing Materials and Devices/center for Advanced analytical Science/School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China

In recent years,MXenes,as a new promising two-dimensional material,have received extensive attentions in the fields of environmental remediation,catalysts,sensors,and energy storage.To broaden the applications of MXenes in sensing,MXenes nanosheets(MNSs) and MXenes quantum dots(MQDs) are prepared by physical etching or chemical oxidation.MNSs are monolayered or multilayered MXenes nanosheets within several nanometers in height,and can serve as the perfect reaction substrate and fluorescence quencher.MQDs are spherical,fluorescent MXenes QDs within several nanometers in size,which possess favorable stability and photo stability.Since the distinct features such as high conductivity,favorable hydrophilicity,biocompatibility,abundant surface functional groups,and easy functionalization,MNSs and MQDs show potential applications in the fields of anti-counterfeiting,environmental monitoring,biosensing and biomedicine.This review focuses on the research of MNS s/MQDs-based optical sensors,including colorimetric sensors,fluorescence sensors,electrochemiluminescence sensors,surface plasmon resonance sensors,and surface-enhanced Raman scattering sensors.Furthermore,the current challenges and prospects concerning MNSs/MQDs-based optical sensing techniques are discussed.

关键词： MXenes quantum dots Fluorescence Colorimetry Electrochemiluminescence Surface plasmon resonance

Rational Design of Capping Ligands of Quantum Dots for Biosensing

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Chemical Research in Chinese Universities 2024年第2期40卷 162-172页

作者： XU Xinran LIU An-an PANG Daiwen State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular RecognitionResearch Center for Analytical SciencesCollege of ChemistryNankai UniversityTianjin300071P.R.China

Quantum dots have been widely applied in biosensing due to their outstanding optical properties.The emissions of quantum dots are mainly determined by their composition and size,as described by the Brus’s equation.Somehow,in this case,their emissions are hardly regulated reversibly and responsively,which are unsuitable for biosensing and biodetection.In the last decade,capping ligands have been used for designing biosensors because of their responsive regulation on the photoluminescence of quantum dots.Here,we first summarize the advances in characterization and calculation specific for ligands,which have helped to provide insights into the photoluminescence process and energy band theory of quantum dots.We then review two ways of ligand design that influence the optical properties of quantum dots:affecting the process of photoluminescence,or the orbital/electronic structure.In the latter case,the atoms on both the ligand and the surface of the quantum dot interact to affect the energy band structure of the quantum dot core.Examples are presented of how these quantum dots that possess responsive properties due to the design of the ligands have been applied to sensing.With further exploration,we hope to see advances in the fundamental understanding of the energy band structures and practical applications of these quantum dots.

关键词： Quantum dot Ligand Photoluminescence Responsiveness Sensor

Incidence and warning signs for complications of human brucellosis: a multi-center observational study from China

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Infectious Diseases of Poverty 2024年第1期13卷 53-62页

作者： Qing-Nan Shi Hui-Jie Qin Qiao-Shan Lu hu Li Zhong-Fa Tao Meng-Guang Fan Mu-Heta Aishan Zeng-Qiang Kou Qiu-Lan Chen Wen-Wu Yin Yan-Ping Zhang National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases Chinese Center for Disease Control and PreventionChangbai RoadChangping DistrictBejing 102206China School of Public Health Guangxi Medical UniversityNanningChina Nanning center for Disease Control and Prevention NanningChina Guizhou center for Disease Control and Prevention GuiyangChina Inner Mongolia center for Disease Control and Prevention HohhotChina Xinjiang Uighur Autonomous Region center for Disease Control and Prevention UrumqiChina Shandong center for Disease Control and Prevention JinanChina

Background Brucellosis is a severe zoonotic disease that is often overlooked,particularly in impoverished countries.Timely identification of focal complications in brucellosis is crucial for improving treatment outcomes.However,there is currently a lack of established indicators or biomarkers for diagnosing these complications.Therefore,this study aimed to investigate potential warning signs of focal complications in human brucellosis,with the goal of providing practical parameters for clinicians to aid in the diagnosis and management of patients.Methods A multi-center cross-sectional study was conducted in China from December 2019 to August 2021.The study aimed to investigate the clinical characteristics and complications of patients with brucellosis using a ques-tionnaire survey and medical record system.The presence of warning signs for complications was assessed using univariate and multivariate logistic regression models.Receiver operating characteristic(ROC)curves and the area under the curve(AUC)were used for variable screening and model evaluation.Results A total of 880 participants diagnosed with human brucellosis were enrolled.The median age of the patients Was 50 years[interquartile range(IQR):41.5-58.0],and 54.8%had complications.The most common organ system affected by complications was the osteoarticular system(43.1%),with peripheral arthritis(30.0%),spondylitis(16.6%),paravertebral abscess(5.0%),and sacroilitis(2.7%)being the most prevalent.Complications in other organ systems included the genitourinary system(4.7%),respiratory system(4.7%),and hematologic system(4.6%).Several fac-tors were found to be associated with focal brucellosis.These factors included a long delay in diagnosis odds ratio(OR)=3.963,95%confidence interval(CI):1.906-8.238 for>90 daysl,the presence of underlying disease(OR=1.675,95%CI:1.176-2.384),arthralgia(OR=3.197,95%CI:1.986-5.148),eye bulging pain(OR=3.482,95%CI:1.349-8.988),C-reactive protein(CRP)>10 mg/L(OR=1.910,95%CI:1.310-2.784)and erythrocyte sedimentation rate(ESR)el

关键词： Brucellosis Complications Clinical spectrum Warning signs