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Barocaloric effect in ferroelastic Pb_(3)(VO_(4))_(2)

Chinese Physics B 2025年第3期34卷 506-510页

作者： Pengtao Cheng Zuhua Chen Chengliang Zhang Zhengming Zhang Bing Li Dunhui Wang Hangzhou Dianzi University Hangzhou 310018China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyKey Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The barocaloric effect is considered as one of the most promising refrigeration with the potential to replace traditional gas compression *** of the main obstacles to the application of barocaloric materials lies in the requirement for high driving *** this paper,we report on the barocaloric effect of Pb_(3)(VO_(4))_(2),which exhibits a ferroelastic transition from a high-temperature trigonal structure to a low-temperature monoclinic structure at 357 K,accompanied by a substantial volume *** entropy change induced by hydrostatic pressure can reach up 14 J·kg^(-1)·K^(-1)under a relatively low pressure of 80 *** work is expected to expand the selection range of barocaloric materials.

关键词： solid-state refrigeration barocaloric effect ferroelastic transition

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Calculation of low-temperature stacking-fault energy and microstructural evolution of high-manganese steels

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The European Physical Journal Special Topics 2025年 1-9页

作者： Jiang, Mingyue Xie, Liancheng Wang, Zekun Geng, Zhen Yuan, Yuan Liu, Kun Huang, Chuanjun Liu, Huiming Miao, Zhicong Huang, Rongjin CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Beijing China Centre of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China Shougang Research Institute of Technology Shougang Group Beijing China

This research investigates low-temperature high-manganese steels, assessing their mechanical properties at low temperatures. The material demonstrates an excellent combination of strength and ductility, making it suitable for low-temperature structural applications, such as the superconducting toroidal field (TF) coil structure material. Thermodynamic modeling has been employed to calculate the stacking-fault energy, allowing us to deduce the plastic deformation mechanisms at different tensile temperatures. Transmission electron microscopy confirms that the predominant deformation mechanism at room temperature is dislocation slip, while it transitions to twinning at low temperatures.

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Trigger mechanism and dynamic characteristics of pressure drop oscillation instability within a liquid cooling loop associated with the compressible volume and the condenser

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Applied Thermal engineering 2025年 274卷

作者： Jiang, Erhui Wang, Wen Guo, Yuxiang Xin, Pengfei Miao, Jianyin Zhang, Hongxing Institute of Refrigeration and Cryogenics School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China National Key Laboratory of Spacecraft Thermal Control Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing100094 China

Pressure drop oscillation is an instability phenomenon encountered in liquid cooling loops utilized for electronic thermal management. However, two significant concerns must be addressed with regard to the triggering mechanism and the dynamic characteristics of the pressure drop oscillation instability, which are the compressible volume and the condenser. This study develops a simulation method for the liquid cooling loop system with multiple degrees of freedom, and the simulated results indicate that the upstream compressible volume is a requisite condition for the emergence of pressure drop oscillation instability in the cooling loop. Furthermore, a critical upstream compressible volume is identified. As the heat flux increases from 200 kW/m2 to 400 kW/m2, the critical dimensionless upstream volume is elevated from 0.03 to 0.05. In addition, the combined effect of both upstream and downstream volumes on the flow hydraulic characteristics of the cooling loop is investigated. It can be found that the magnitude of oscillations in the downstream volume is significantly less than those observed in the upstream volume. Moreover, these dynamic oscillations in the downstream volume can be eliminated when it reaches a specific threshold value. The effects of the hydrodynamic characteristics and the internal compressible volume of the condenser are analyzed. It is observed that as both the cooling flux and the hydraulic diameter increase to a specific threshold, the amplitude of the oscillations in the downstream volume increases by 21.4 % and decreases by 88.6 %, respectively. Meanwhile, the internal compressible volume of the condenser contributes to a reduction in the oscillation amplitude and an elevation in oscillation frequency. © 2025 Elsevier Ltd

关键词： Chilling

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Force field optimization and solid–liquid equilibrium predictions of methane and noble gases by molecular dynamics simulations

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Journal of Molecular Liquids 2025年 429卷

作者： Yang, Zhi Cui, Mingjun Zhao, Junwen Lin, Pengcheng Zhuang, Xiaoru Wang, Xian Zhao, Yanxing Chen, Ying School of Materials and Energy Guangdong University of Technology Guangzhou510006 China School of Mechanical and Electrical Engineering Shenzhen Polytechnic University Shenzhen518055 China Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China

Accurate prediction of solid–liquid phase equilibrium through molecular dynamics simulation remains a significant challenge. Within the framework of reference state method, sensitivity analysis was conducted to evaluate the effect of reference temperature selection on melting point prediction. The predicted melting point slightly decreases as the reference temperature gradually deviates from the target value. Considering the limitations of traditional force fields (FFs) typically fitted with thermodynamic properties of fluid phases, the classical TraPPE FF was evaluated by calculating different thermodynamic properties at supercooled liquid phase and melting points along the solid–liquid coexistence curve. Despite high accuracy for liquid-phase thermodynamic properties, the TraPPE FF shows significant deviations for melting point predictions. Furthermore, though a dimensionless conversion of the solid–liquid coexistence points, an empirical correlation function accurately relating the coexistence pressure and the coexistence temperature is proposed. Using this correlation function as a constrain, an optimized FF set (Ε = 0.256 kcal/mol and σ = 3.466 Å) is efficiently determined by Levenberg-Marquardt algorithm, exhibiting an average absolute deviation of merely 1.49 % and a maximum deviation of 2.42 %. Outside the temperature range of parameter fitting, the good extrapolation prediction capability (ARD = 1.76 %) of the optimized FF is also validated. Besides, the proposed correlation model shows good applicability to four noble gases with deviations in melting point predictions all falling below 1.7 K. © 2025 Elsevier B.V.

关键词： Melting point

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Colorful liquid metal printed electronics

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Science China(Technological Sciences) 2018年第1期61卷 110-116页

作者： LIANG ShuTing LIU Jing Department of Biomedical Engineering School of Medicine Tsinghua University Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of Sciences

Liquid metal based printed electronics was a newly emerging frontier in recent years. However, restricted by the single silver-white appearance of the liquid metal （LM）, the colors of currently available printed electronics were rather limited. Here, a new conceptual LM based colorful printed electronics was proposed where electrical wires and circuits with numerous colors can be made via a straightforward, efficient and accurate printing procedure. Firstly, the LM was printed on the substrate to construct a conductive wire. Then it was frozen to a solid. Subsequently, colorful pigments were coated on the originally printed liquid metal conductive wires, which finally were packaged with PDMS. Such multicolored conductive wire exhibits excellent conductivity, and good temperature resistance （do not fade at high temperature）. Further, the adhesion mechanism of the mineral pigments on the liquid metal layer was disclosed. And the pigment layer was discovered to well protect the LM from the outside environments, and enhance the durability of the LM conductive wire at the same time. These multicolored liquid metal wires take an aesthetic appearance, excellent printability, flexibility, large conductivity and stable performance, which would significantly enhance the sense of beanty and experience when compared to the conventional printed electronics.

关键词： liquid metal printed electronics multicolor functional device

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Strategic Design of High-Directional Scaffold Enabling Accelerated Kinetics for High-Loading Low-Temperature Lithium-Sulfur Batteries

SSRN

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SSRN 2025年

作者： Shi, Junye Yu, Chenxi Ning, Yuchen Li, Bao Wang, Bao Zheng, Shumin Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai200433 China State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of Sciences Beijing100190 China School of Chemistry and Chemical Engineering Henan Normal University Xinxiang453007 China College of Chemistry and Materials Jiangxi Agricultural University Nanchang330045 China

Electronic market starves for efficient batteries at low temperatures. Herein, a free-standing and highly directional scaffold filled with NiCo-decorated carbon nanotube bushes (HDS-NCCNT) is synthesized and employed as a three-dimensional thick host for low-temperature lithium-sulfur (Li-S) batteries. This unique structure can ensure the high loading of active material and improve the sluggish reaction kinetics at low temperatures. The NCCNT bushes can further suppress the shuttle effect of lithium polysulfides and prolong the lifespan. As a result, the Li2S6@HDS-NCCNT cathode with a loading mass of 5 mg cm-2 exhibits a remarkable capacity of 1026 mAh g-1 at 0.1 C under -20 ℃. Even under -40 ℃, the Li2S6@HDS-NCCNT cathode also shows favorable performance with a high sulfur loading of 10 mg cm-2. This pioneering work demonstrates the rational design of components and architectures ranging from micrometer to nanometer scale, which inspires the development of high-loading Li-S batteries under cryogenic conditions. © 2025, The Authors. All rights reserved.

关键词： Lithium sulfur batteries

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Liquid phase 3D printing for quickly manufacturing conductive metal objects with low melting point alloy ink

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Science China(Technological Sciences) 2014年第9期57卷 1721-1728页

作者： WANG Lei LIU Jing Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Department of Biomedical Engineering School of Medicine Tsinghua University

Conventional 3D metal printings are generally time-consuming as well as lacking of high performance printable *** an alternative way,here we proposed the method of liquid phase 3D printing for quickly making conductive metal *** introducing metal alloys whose melting point is slightly above room temperature as printing inks,several representative structures spanning from one,two and three dimension to more complex patterns were demonstrated to be quickly *** with the air-cooling in a conventional 3D printing,the liquid-phase-manufacturing offers a much higher cooling rate and thus significantly improves the speed in fabricating the target metal *** unique strategy also efficiently prevents the liquid metal inks from air oxidation,which is hard to avoid otherwise in an ordinary 3D *** key physical factors(such as properties of the cooling fluid,air pressure within the syringe barrel and needle diameter,types and properties of the printing ink)and several interesting intermediate fluids interaction phenomena between liquid metal and conventional cooling fluids such as water or ethanol,which evidently affecting the printing quality,were *** addition,a basic route to make future liquid phase 3D printer incorporated with both syringe pump and needle arrays was also *** liquid phase 3D printing,which owns potential values not available in a conventional method,opens an efficient way for quickly making conductive metal objects in the coming time.

关键词： liquid phase 3D printing liquid metal printer rapid prototyping low melting point metal liquid cooling oxidation

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Compatible hybrid 3D printing of metal and nonmetal inks for direct manufacture of end functional devices

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Science China(Technological Sciences) 2014年第11期57卷 2089-2095页

作者： WANG Lei LIU Jing Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of Sciences Department of Biomedical Engineering School of Medicine Tsinghua University

The currently available 3D printing still cannot simultaneously deal with the metal and nonmetal inks together due to their huge difference in the melting points and poor compatible printability between each other. Here through introducing the low melting point alloy Bi35In48.6Sn16Zno.4 and silicone rubber as functional inks, we proposed a compatible hybrid 3D printing method for manufacturing the desired device, the supporting substrate and the allied package structure together. The principle of pneumatic-typed 3D printing of multiple inks was described and typical physical properties of the ink Bi35In48.6Sn16Zno.4 were measured. Several key factors dominating the printing quality such as the temperature of the printing head, the air pressure exerted upon the liquid metal ink in the syringe, the moving velocity and the height of the printing head etc. were clarified. A general way of directly printing out 3D structured electronic devices consisting of both metal and nonmetal materials was demonstrated. Such hybrid objects were patterned and formed up layer by layer with Bi35In48.6Sn16Zno.4 alloy and silicone rub- ber which would become solidified after standing for a period of time under room temperature. To illustrate the compatible printability of these printing inks, a three-layer tricolor LED stereo circuit with controlled lighting capability was further man- ufactured and evaluated. The present study opens an important hybrid 3D printing way for directly manufacturing functional and structural end devices in an easy and low cost way.

关键词： liquid metal ink hybrid 3D printing compatible manufacture electronic device stereo circuit

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Nanocellulose-based reusable liquid metal printed electronics fabricated by evaporation-induced transfer printing

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Journal of Materials Science & Technology 2021年第2期61卷 132-137页

作者： Yiru Mao Yixiang Wu Pengju Zhang Yang Yu Zhizhu He Qian Wang Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment Department of Vehicle EngineeringCollege of EngineeringChina Agricultural UniversityBeijing 100183China Chinese Academy of Sciences Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijing 100190China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Beijing 100190China Beijing DREAM INK Technologies Co. Ltd..Beijing 100084China

Reusable electronics have received widespread attention and are urgently needed. Here, nanocellulosebased liquid metal(NC-LM) printed circuit has been fabricated by the evaporation-induced transfer printing technology. In this way, the liquid metal pattern is embedded into the nanocellulose membrane, which is beneficial for the stability of the circuit during use. Besides, the NC-LM circuit is ultrathin with just tens of microns. In particular, the finished product is environmentally friendly because it can be completely dissolved by water, and both the liquid metal ink and the nanocellulose membrane can be easily recollected and reused, thereby reducing waste and pollution to the environment. Several examples of flexible circuits have been designed to evaluate their performance. The mechanism of evaporation-induced transfer printing technology involves the deposition, aggregation, and coverage tightly of the nanosized cellulose fibrils as the water evaporated. This study provides an economical and environmentally friendly way for the fabrication of renewable flexible electronics.

关键词： Reuse Liquid metal Transfer printing Nanocellulose Flexible electronics

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Transparent soft PDMS eggshell

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Science China(Technological Sciences) 2015年第2期58卷 273-283页

作者： LAI YiYu LIU Jing Department of Biomedical Engineering School of Medicine Tsinghua University Beijing Key Laboratory of Cryo Biomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of Sciences

In vivo 3D fluorescent image remains a technological barrier for biologists and clinical scientists although green fluorescent protein(GFP)imaging has long been performed rather well at cellular ***,robust enough portable devices are also challenging lab-on-a-chip advocators who wish their designs to be nurtured by the end *** work is dedicated to propose a conceptually innovated transparent soft PDMS avian eggshell to directly tackle the above two ***,an"egg-on-a-chip"scheme is originally developed and demonstrated by a newly developed PDMS"soft"process *** its ancestor–the conventional"lab-on-a-chip"(LOC)which is basically chemically based,the current"egg-on-a-chip",intrinsically inherited with biological natures,opens a way to integrate biological parts or whole system in a miniature sized *** biomimics system contains much condensed environmental evolutional tensor inside than those of the existing LOC compacted with artificial components which however are quite difficult to incorporate various life factors *** unique advantages,a series of transparent PDMS whole"eggshells"have been fabricated and applied to culture avian embryos up to 17.5 days and chimeric eggshells were engineered on normal *** addition,X-stage embryos were successfully initiated in such system and pre-chorioallantoic membrane was ***,limitation of the present process was interpreted and potential approach to improve it was *** both high optical transparency and engineering subtlety fully integrated together,the present method not only provides an ideal transparent imaging platform for studying functional embryo development including life mystery,but also promises a future strategy for"lab-on-an-egg"technology which may be important in a wide variety of either fundamental or practical areas.

关键词： soft PDMS process method biological mould egg-on-a-chip portable device pre-chorioallantoic membrane biomimics

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