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水下egain对7075铝合金的脆化机理研究

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兵器材料科学与工程 2024年第6期47卷 19-25页

作者：林飘扬曹立军金秀军蒋博宇汪明明龚留奎叶兵黄伟中国兵器科学研究院宁波分院浙江宁波315103 宁波表面工程研究院有限公司浙江宁波315103 上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心上海200240

用egain涂覆7075铝合金表面,并进行液态金属脆化研究,探究在大气与水两种环境下腐蚀脆化对铝合金微观结构、力学性能的影响规律。结果表明:与大气相比,在水下样品的腐蚀速率和力学性能弱化程度更高,其抗拉强度、伸长率和弹性模量分别降... 详细信息

用egain涂覆7075铝合金表面,并进行液态金属脆化研究,探究在大气与水两种环境下腐蚀脆化对铝合金微观结构、力学性能的影响规律。结果表明:与大气相比,在水下样品的腐蚀速率和力学性能弱化程度更高,其抗拉强度、伸长率和弹性模量分别降低了37.5%、57.7%和44.2%。对断口形貌和腐蚀产物表征发现,egain在7075铝合金内部沿晶界扩散,促进了铝和水反应。铝水反应与液态金属扩散脆化协同作用,使水下egain对7075铝合金的拉伸性能削弱程度更高,证明水是液态金属脆化的重要影响因素。

关键词： egain 7075铝合金液态金属脆化拉伸性能

Liquid metal-based paper electronics:Materials,methods,and applications

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Science China(Technological Sciences) 2023年第6期66卷 1595-1616页

作者： JIANG ChengJie GUO Rui Department of Biomedical Engineering Tianjin UniversityTianjin 300072China

The liquid metals exhibit both the properties of liquids and metals and have a low melting point near room *** a lowcost and easy-to-obtain flexible substrate,paper has significant advantages for large-area and multilayer flexible circuit *** has led to a growing interest in liquid metal-based paper electronics among both scientists and *** order to promote the development and application of liquid metal-based paper electronics,this review will summarize and analyze the progress from three perspectives,including liquid metal inks,printing methods,and their applications.A variety of liquid metalbased electronic inks are introduced,and their advantages and disadvantages are ***,a comparison of typical fabrication methods has been presented,including chemical interaction-based selective adhesion and surface roughness-based transfer printing.A number of emerging applications used and expected to be applied to liquid metal-based paper electronics have been ***,paper electronics based on liquid metals are discussed along with their challenges and opportunities for the further *** the future,further investigations and applications of paper electronics based on liquid metals are expected.

关键词： egain flexible electronics paper electronics health monitoring

Low-melting mixture solvents:extension of deep eutectic solvents and ionic liquids for broadening green solvents and green chemistry

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Green Chemical Engineering 2024年第4期5卷 409-417页

作者： Yu Chen Zhiwu Yu MOE Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology Department of ChemistryTsinghua UniversityBeijing100084China

Green solvents such as water and ionic liquids(ILs)are pillars of the great mansion of green chemistry and green *** proposed as a new family of ILs,deep eutectic solvents(DESs)have received fast development in the past two *** this contribution,DESs are reviewed critically and the concept is extended to lowmelting mixture solvents(Lo MMSs),which cover all kinds of materials including ionic compounds,molecular compounds,and *** classes of Lo MMSs are proposed as the new classification system and examples are ***,several thermodynamic issues concerning Lo MMSs are *** new concepts,robustness of Lo MMSs and high-entropy Lo MMSs,are proposed.

关键词： Green solvents Deep eutectic solvents Low transition temperature mixture solvents Phase diagram egain

Achieving High-Performance Molecular Rectification through Fast Screening Alkanethiol Carboxylate- Metal Complexes Electroactive Units

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CCS Chemistry 2023年第4期5卷 902-914页

作者： Lixian Tian Aiqing Fan Xi Yu Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Science School of ScienceTianjin UniversityTianjin 300072

Achieving high performance in molecular scale diode devices remains a formidable challenge due to the complexity of the charge transport process and the difficulty in device structure ***,we demonstrated a low-cost and fast screening strategy to search for proper electroactive units and construct high performance self-assembled monolayer(SAM)-based molecular *** strategy is based on off-the-shelf carboxylate-terminated alkane thiols and simple carboxylate-metal ion complexes,structures denoted as Au-S-(CH2)n-1COO−Mm+(Cn+Mm+),where n=11,12,13,14,16,18,and Mm+=Ca^(2+),Mn^(2+),Fe_(2)+,Fe3+,Co^(2+),Ni^(2+),Cu^(2+),and Zn^(2+),as the library of functional SAM layers on gold *** the fast screening measurements using a eutectic indium-gallium alloy top contact(egain),C18+Ca^(2+)and C18+Zn^(2+)structures were found to afford record high rectification ratio(RR)>700 at±1.5 *** analysis based on a single level tunneling model shows that the C18+Ca^(2+)and C18+Zn^(2+)devices possessed an optimized combination of asymmetric voltage division,energy offset,and coupling of carboxylate-metal complexes with the *** newly developed method represents a general strategy for fast,inexpensive,and effective exploration of the functional metal complex chemical space,and can largely accelerate the development of practical high performance molecular diode devices.

关键词： molecular diode egain self-assembled monolayer screening

Room-temperature liquid metal synthesis of nanoporous copper-indium heterostructures for efficient carbon dioxide reduction to syngas

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Science China Materials 2022年第12期65卷 3504-3512页

作者： Xingcheng Ma Feng Wang Dongxu Jiao Dantong Zhang Xiao Zhao David JSingh Jingxiang Zhao Xiaoqiang Cui Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOEJilin UniversityChangchun 130012China Key Laboratory of Photonic and Electronic Bandgap Materials Ministry of Educationand College of Chemistry and Chemical EngineeringHarbin Normal UniversityHarbin 150025China Department of Physics and Astronomy and Department of Chemistry University of MissouriColumbiaMissouri 65211United States Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

Nanoporous metals show promising performances in electrochemical *** this paper,we report a self-supporting bimetallic porous heterogeneous indium/copper structure synthesized with a eutectic gallium-indium(egain)material on a copper *** nanoporous copper-indium heterostructure catalyst exhibits excellent performance in the reduction of carbon dioxide to *** ratio of H_(2)/CO is tunable from 0.47 to 2.0 by changing working *** catalyst is highly stable,showing 96%maintenance of the current density after a 70-h continuous *** functional theory calculations reveal that the indium/copper interface induces charge redistribution within the copper surface,leading to the formation of two distinct active sites,namely,Cu^(δ)and Cu0,and enabling a high-performance generation of CO and H_(2).This work provides a new strategy for obtaining self-supporting nanoporous metal electrode catalysts.

关键词： syngas liquid metal egain heterostructure nanoporous metal

From liquid metal to stretchable electronics:Overcoming the surface tension

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Science China Materials 2022年第8期65卷 2072-2088页

作者： Zixu Yang Dan Yang Xizheng Zhao Qinyi Zhao Ming Zhu Yan Liu Yu Wang Weihong Lu Dianpeng Qi MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China National and Local Joint Engineering Laboratory for Synthesis Transformation and Separation of Extreme Environmental NutrientsHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 450001China

The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or *** these products need to work during deformation,their requirements for materials focus on stretchability and *** metals are excellent materials with these ***,liquid metals have extremely high surface tension at room temperature,which will spontaneously form a spherical shape and are difficult to form the shape required by stretchable devices,which is the biggest obstacle to their development in this emerging ***,the emphasis is placed on the principle of overcoming the high surface tension in this review,and various methods of using liquid metals to fabricate stretchable electronic devices based on these principles have been *** metals show promise in the convenience of sensing,energy harvesting,*** existing challenges and opportunities are also discussed here.

关键词： liquid metals egain Galinstan stretchable electronics surface tension

基于液态金属摩擦纳米发电机能量采集与储能系统的设计及应用

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基于液态金属摩擦纳米发电机能量采集与储能系统的设计及应用

作者：杨嘉宏广西大学

学位级别：硕士

随着科技的飞速发展和穿戴设备数量的急速增长,分布式能源的需求与日俱增。目前大多数的可穿戴设备依旧采用传统的电池供电,但是电池的续航时间相对较短,质量和体积较大,正在限制其进一步的发展和应用。摩擦纳米发电机(TENG)具有结构各... 详细信息

随着科技的飞速发展和穿戴设备数量的急速增长,分布式能源的需求与日俱增。目前大多数的可穿戴设备依旧采用传统的电池供电,但是电池的续航时间相对较短,质量和体积较大,正在限制其进一步的发展和应用。摩擦纳米发电机(TENG)具有结构各异、可硬可柔、轻质、可植入性优异、俘获能量的尺度大、响应迅速、结构简单和制备成本较低等特点,使得摩擦纳米发电机自提出以来已经在微/纳能源、自驱动传感等方面取得实质性的进展。由于身体的运动频繁,传统的硬质电路设备容易发生磕碰导致功能失效。因此,以镓-铟液态金属共晶(EGa In)为主的镓基液态金属,由于其导电性优异,并且能随着柔性基底自由变形,目前已经成为柔性电子设备中备受瞩目的材料之一。在此,本文通过结合液态金属的优势和目前穿戴设备遇到的挑战,提出了基于液态金属摩擦纳米发电机的自供电一体化功能电路。主要的研究内容如下:(1)本文通过改性镓基液态金属(EGa In)设计了一种液态金属墨水(Cu-EGa In),并通过简单的掩膜法实现了在柔性基底中的图案化绘制。并验证和展示了其在拉伸状态下具有较高的导电性。(2)以液态金属墨水为电极材料,以PDMS(聚二甲基硅氧烷)和TPU(聚氨酯弹性体橡胶)为摩擦层,制备了液态金属电极的摩擦纳米发电机(LM-TENG)。在4 Hz的接触分离频率时,LM-TENG的本征输出达到了短路电流8.9μA,开路电压输出90.2 V,转移电荷37.04 n C。在较低的运动频率下(2 Hz)其最大平均的功率密度为207.16 m W/m。(3)以二维层状结构的金属碳/氮化物纳米片(MXene)和Cu-EGa In为的电极材料制备了MXene/液态金属的复合电极超级电容器,其比电容可达1.51 m F/cm,比只用液态金属制备的超级电容器电容量提高了40倍。并且在0-0.8 V的电压窗口内表现为明显的双电层电容的特性。在拉伸30%情况下表现出良好的双电层电容特性和电容保持率。(4)通过能量管理模块实现了LM-TENG的低压直流输出,并以此为储能设备充电。最后,以Cu-EGa In图案化绘制的LM-TENG、能量管理模块和MXene/液态金属的复合电极超级电容器组成的自供电系统带动液态金属红外对管电路正常工作。

关键词： egain 摩擦纳米发电机柔性超级电容器能量管理模块可穿戴设备自供电系统