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Science China Chemistry 2025年第1期 360-368页

作者： Zheng Liu Changyu Zhang Zipeng Li Wanying Ma Jia Liu Xiang Xia Ning Xu Wen Sun Jianjun Du Jiangli Fan Xiaojun Peng state key laboratory of Fine Chemicals Dalian University of Technology Ningbo Institute of Dalian University of Technology

Endoplasmic reticulum(ER) viscosity has emerged as a new potential biomarker for hepatic fibrosis(HF). Herein, we report the first ER-targeting viscosity-responsive near-infrared(NIR) fluorescent probe HBT-PP for investigations of HF *** twisted intramolecular charge transfer(TICT) and the excited state intramolecular proton transfer(ESIPT) are combined to endow HBT-PP with the selective response towards viscosity(～62-fold) and a super large stokes shift(～320 nm). HBT-PP mainly targets organelle ER and is able to image the drug-or alcohol-induced viscosity elevation in living cells. Significantly,HBT-PP was successfully applied to visualize the gender difference in HF and the protective role of estrogen in restraining HF progression. Of note, after 10 min of stain with HBT-PP, HF lesions showed a stage-based response, indicating the potential of this probe in fast and early diagnosis of HF. These results clearly demonstrated the promising application of HBT-PP as a new tool for exploring ER viscosity-involved physiological and pathological processes.

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Structural Transition of Gd2O3：Eu Induced by High Pressure

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Chinese Physics Letters 2007年第1期24卷 158-160页

作者：陈海勇贺春元高春晓张家骅高世勇路红亮聂延光李冬妹阚世海邹广田 state key laboratory of super hard materials Jilin Ihliversity Changchun 130012 key laboratory of Excited state Processes Changchun Institute of Optics Fine ~lechanics and Physics Chinese Academy of Sciences Ghang-chun 130033

The structural transition of bulk and uano-size Gd2O3：Eu are studied by high pressure energy disperse x-ray diffraction （XRD） and high pressure photoluminescence. Our results show that in spite of different size of Gd2O3 particles, the cubic structure turns into a possible hexagonal one above 13.4 GPa. When the pressure is released, the sample reverses to the monoclinic structure. No cubic structure presents in the released samples. That is to say, the compression and relaxation of the sample leads to the cubic Gd2O3：Eu then turns into the monoclinic one.

关键词： OPTICAL diffraction PHOTOLUMINESCENCE PARTICLES HEXAGONS

A rolled Mg-8Al-0.5Zn-0.8Ce alloy with high strength-ductility synergy via engineering high-density low angle boundaries

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Journal of Magnesium and Alloys 2022年第10期10卷 2889-2900页

作者： Xiao Ma Min Zha Siqing Wang Yi Yang Hailong Jia Dan Gao Cheng Wang Huiyuan Wang key laboratory of Automobile materials of Ministry of Education&School of materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun 130025PR China state key laboratory of super hard materials Jilin UniversityChangchun130012PR China International Center of Future Science Jilin UniversityChangchun 130012PR China

Developing low-cost rolled Mg alloys with both high strength and ductility is desirable,while the improved strength is generally accompanied with decreased ***,by using rotated hard-plate rolling(RHPR)with a total thickness reduction of~85%,we obtained a Mg-8Al-0.5Zn-0.8Ce(wt.%,AZ80-0.8Ce)alloy with a high strength-ductility synergy,i.e.,the yield strength(YS),ultimate tensile strength(UTS)and elongation-to-failure(EF)are~308 MPa,~360 MPa and~13.8%,*** reveals that the high YS is mainly originated from grain boundary strengthening(~212 MPa),followed by dislocation strengthening(~43 MPa)and precipitation hardening(~25 MPa).It is found that a relatively homogeneous fine grain structure containing a large fraction(~62%)of low angle boundaries(LABs)is achieved in the RHPRed alloy,which is benefit for the high tensile EF *** demonstrates that LABs have important contributions to strengthening and homogenizing tensile deformation process,leading to the simultaneous high strength and high *** work provides a new insight for fabrication of low-cost high performance Mg alloys with an excellent strength-ductility synergy.

关键词： Mg-Al-Zn alloys Rolling Strengthening mechanism Microstructure Strength-ductility synergy

Synergistic improvement of damping capacity and mechanical properties of magnesium alloy prepared with UHP technology

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Journal of Rare Earths 2024年第12期42卷 2279-2284页

作者： Dan Wang Peizhao Huang Ruizhi Wu Hailiang Huang Tao Zhong Cunwei Zou Yaqiang Song key laboratory of New Carbon-based Functional and super-hard materials of Heilongjiang Province School of Physics and Electronic EngineeringMudanjiang Normal University key laboratory of superlight materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Nanning College for Vocational Technology

The contradictory relationship between the damping capacity and strength of metals, governed by dislocation mechanisms, poses a challenge in improving simultaneously through dislocation strengthening. Accordingly, exploring novel methods to synergistically enhance mechanical properties and damping capacity is designated as a focal research subject in recent years. The study at hand aims to tackle this challenge through the manipulation of microstructures in Mg-Y-Er-Zn-Zr alloy via ultra-high pressure(UHP) heat treatment, yielding Mg-based alloys of exceptionally lightweight with outstanding damping and mechanical characteristics. After UHP, a significant refinement in the alloy's grain size is observed, with the average grain size decreasing from 114 to 23 μm, accompanied by substantial introduction of dislocations into the matrix, along with the emergence of twin within the matrix. The tensile strength of M-6GPa-1000 alloy subjected to UHP treatment achieves 326 MPa, demonstrating a 95% increase compared to ordinary heat treatment alloys while maintaining an elongation of 11.9%.Additionally, the damping capacity value Q-1 of M-6GPa-1000 alloy treated with UHP during the low-strain zone is 0.03, exhibiting a threefold increase compared to that of the conventionally heat-treated alloy. Through UHP treatment, the alloy's microstructure is regulated, achieving a synergistic enhancement of strength and damping capacity. The study comprehensively analyzes the synergistic improvement of mechanical and damping characteristics in the alloy. The proposed UHP technology holds significant potential for the fabrication of advanced Mg-Re components.

关键词： Mg-RE alloy Ultra-high pressure treatment Mechanical properties Damping capacity Rare earths

Generalized stability criterion for controlling solidification segregation upon twin-roll casting

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Journal of materials Science & Technology 2023年第3期134卷 163-177页

作者： Pan Wu Yubing Zhang Jiaqi Hu Shaojie Song Yong Li Huiyuan Wang Guo Yuan Zhaodong Wang Shizhong Wei Feng Liu state key laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical and Testing Center Northwestern Polytechnical UniversityXi’an 710072China state key laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China state key laboratory of super hard materials Jilin UniversityChangchun 130012China National Joint Engineering Research Center for Abrasion Control and Molding of Metal materials Henan University of Science and TechnologyLuoyang 471003China

Macro-and micro-segregation formed upon twin-roll casting(TRC)can be inherited from sub-rapid solid-ification to solid-state transformation,even to plastic deformation,thus deteriorating drastically mechan-ical properties of as-produced thin *** many works focusing mainly on controlling fields of thermal,concentration and convection have been reported,how to control artificially and quantitatively the segregation using a theoretical connection between processing parameters and solidification models,has not been realized,*** it,a systematical framework integrating non-equilibrium dendritic growth and overall solidification kinetics with the TRC parameters,was constructed applying a general-ized stability(GS)conception deduced from transient thermodynamic driving force△G^(t)and transient ki-netic energy barrier Q_(eff)^(t)evolving upon *** from this framework considering synergy of thermodynamics and kinetics(i.e.,thermo-kinetic synergy),a criterion of high△G^(t)-high GS guaranteed that the macro(i.e.,the centerline)and the micro(i.e.,the edge)segregation can be suppressed by in-creasing△G^(t)and GS at the beginning and the ending stage of sub-rapid solidification,*** typical thermo-kinetic combination producing the microstructure can be inherited into the plastic de-formation,as reflected by corresponding strength-ductility *** work realized quantitative controlling of TRC by a theoretical connection between processing parameters and solidification models,where,an optimization for sub-rapid solidification segregation using the GS conception including△G^(t)and Q_(eff)^(t)has been performed.

关键词： Segregation Sub-rapid solidification Generalized stability Twin-roll casting Thermo-kinetics

Grain boundary restructuring and La/Ce/Y application in Nd–Fe–B magnets

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Chinese Physics B 2019年第7期28卷 25-53页

作者： Mi Yan Jiaying Jin Tianyu Ma School of materials Science and Engineering State Key Laboratory of Silicon MaterialsKey Laboratory of Novel Materials for Information Technology of Zhejiang Province Zhejiang University

Since the 1980 s, Nd–Fe–B with largest energy product(BH)max approaching the theoretical limit has become the landmark of permanent magnetic *** application spectrum for Nd–Fe–B continues to expand over time both in the industrial and commercial sectors, which leads to growing research interests for solving the long-standing drawbacks of Nd–Fe–B, i.e., poor corrosion resistance, low coercivity, high Dy/Tb and low La/Ce/Y *** the above obstacles, we aim to present the novel grain boundary restructuring(GBR) approach, from GB design, processing, to structure evolution and property evaluation with a focus on the corrosion and coercivity mechanism of the restructured 2:14:1-typed *** with an introduction to the fundamental of GBR, two representative examples,high-electrode-potential(Pr, Nd)32.5Fe62.0Cu5.5 and low-melting-point Dy71.5Fe28.5, are given with detailed descriptions of the advantages of GBR to enhance the intrinsic anti-corrosion stability and to strengthen the coercivity at low Dy ***–property correlations are established to understand the critical importance of regulating the restructured GB phase to maximize the all-round performance of the 2:14:1-typed permanent *** at sustainable and balanced development of rare earth(RE) industry, the proceeding section proposes new prototypes of La–Ce and Y–Ce co-substitutions with dual benefits of stabilizing the 2:14:1 tetragonal phase and strengthening the intrinsic hard *** findings of additional REFe2 intergranular phase delight that the GBR approach also opens up a new horizon of research and application to develop high-performance La/Ce/Y-rich permanent magnets with deliberately tailored GB phase.

关键词： grain boundary restructuring coercivity corrosion resistance Dy/Tb La/Ce/Y

Strong-superstrong Transition in Glass Transition of Metallic Glass

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Chinese Physics Letters 2010年第3期27卷 232-235页

作者：王丹彭鸿雁徐晓雨陈宝玲吴春雷孙民华 key laboratory of New Carbon-based Functional and super-hard materials of Heilongjiang Province School of Physics and Electronic Engineering Mudanjiang Teachers College Mudanjiang 157012 School of Physics and Electronic Engineering Harbin Normal University Harbin 150025

Dynamic fragility of bulk metallic glass （BMG） of Zr64Cu16Ni10Al10 alloy is studied by three-point beam bending methods. The fragility parameter mfor Zr64Cu16Ni10Al10 BMG is calculated to be 24.5 at high temperature, which means that the liquid is a ＂strong＂ liquid, while to be 13.4 at low temperature which means that the liquid is a ＂super-strong＂ liquid. The dynamical behavior of Zr64Cu16Ni10Al10 BMG in the supercooled region undergoes a strong to super-strong transition. To our knowledge, it is the first time that a strong-to-superstrong transition is found in the metallic glass. Using small angle x-ray scattering experiments, we find that this transition is assumed to be related to a phase separation process in supercooled liquid.

关键词： Soft matter liquids and polymers Condensed matter: structural mechanical & thermal

EFFECTS OF MATRIX MOLECULAR WEIGHT ON STRUCTURE AND REINFORCEMENT OF HIGH DENSITY POLYETHYLENE/MICA COMPOSITES

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Chinese Journal of Polymer Science 2011年第3期29卷 377-389页

作者：傅强 Department of Polymer Science and materials State Key Laboratory of Polymer Materials Engineering Sichuan University

Three types of high-density polyethylene （HDPE） with different molecular weights （high, medium and low） were adopted to evaluate the influence of matrix molecular weight on the structure-property relation of injection-molded HDPE/mica composites through a combination of SEM, 2d-WAXS, DSC, DMA and tensile testing. Various structural factors including orientation, filler dispersion, interfacial interaction between HDPE and mica, etc., which can impact the macroscopic mechanics, were compared in detail among the three HDPE/mica composites. The transcrystallization of HDPE on the mica surface was observed and it exhibited strong matrix molecular weight dependence. Obvious transcrystalline structure was found in the composite with low molecular weight HDPE, whereas it was hard to be detected in the composites with increased HDPE molecular weight. The best reinforcement effect in the composite with low molecular weight HDPE can be understood as mainly due to substantially improved interfacial adhesion between matrix and mica filler, which arises from the transcrystallization mechanism.

关键词： Polyethylene/mica composite Molecular weight Transcrystallization.

A low power automatic gain control loop for a receiver

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Journal of Semiconductors 2010年第9期31卷 108-112页

作者：李国锋耿志卿吴南健 state key laboratory for super lattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences

This paper proposes a new structure to lower the power consumption of a variable gain amplifier（VGA） and keep the linearity of the VGA *** structure is used in a high rate amplitude-shift keying（ASK） based *** includes an automatic gain control（AGC） loop and ASK *** AGC mainly consists of sixstage *** IF-stage is realized in 0.18μm CMOS *** measurement results show that the power consumption of the whole system is very *** system consumes 730μA while operating at 1.8 *** minimum ASK signal the system could detect is 0.7 mV（peak to peak amplitude）.

关键词： low power linearity variable gain amplifier automatic gain control loop amplitude-shift keying

A high efficiency charge pump circuit for low power applications

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Journal of Semiconductors 2010年第1期31卷 88-92页

作者：冯鹏李昀龙吴南健 state key laboratory for super Lattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences

A high efficiency charge pump circuit is designed and realized. The charge transfer switch is biased by the additional capacitor and transistor to eliminate the influence of the threshold voltage. Moreover, the bulk of the switch transistor is dynamically biased so that the threshold voltage gets lower when it is turned on during charge transfer and gets higher when it is turned off. As a result, the efficiency of the charge pump circuit can be improved. A test chip has been implemented in a 0.18μm 3.3 V standard CMOS process. The measured output voltage of the eight-pumpingstage charge pump is 9.8 V with each pumping capacitor of 0.5 pF at an output current of 0.18 μA, when the clock frequency is 780 kHz and the supply voltage is 2 V. The charge pump and the clock driver consume a total current of 2.9 μA from the power supply. This circuit is suitable for low power applications.

关键词： high efficiency low power charge pump circuit high-voltage generator standard CMOS process