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Enabling Supramolecular Phase Change Materials with High Latent Heat Ability and Recyclability

INDUSTRIAL & engineering CHEMISTRY RESEARCH 2024年第32期63卷 14190-14198页

作者： Liao, Yansheng Wei, Zhengkai Chen, Silong Zeng, Xiaohui Chen, Xingbao Lei, Yuan Jiang, Liang Liu, Zhimeng Lei, Jingxin Fu, Xiaowei Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Sichuan Univ Sch Chem Engn Chengdu 610065 Peoples R China

The design of supramolecular phase change materials (SPCMs) with both high latent heat and recyclability remains challenging via multivalent interactions such as hydrogen bonds. Herein, the SPCMs are developed by integrating linear polyethylene glycol (PEG) as phase change functional components into physically cross-linking networks formed via the multivalent interactions between linear supramolecular polymers of polyurethane, enabling a combination of high latent heat of 143.1 J/g and solvent-assisted recyclability. The SPCMs presented the tunable latent heat (87.3-143.1 J/g) and phase change temperature (36.4-59.8 degrees C) via the tunable molecular weight and content of linear free PEGs. The SPCMs had much smaller spherulite size than the free PEG counterparts due to the effect of the supramolecular polymer on the crystallization behaviors of free PEGs in SPCMs. The supramolecular polymer network endowed the SPCMs with good thermal reliability, thermal stability, and nonleakage properties. Significantly, the solvent-assisted recycle of SPCMs were enabled via completely dissolving the SPCM in solvent and then removing the solvent. The design of SPCMs nicely realizes the combination of high latent heat and recycling, which will extend the application range of phase change materials.

关键词： Phase change materials

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Study of Flow and Zinc Dross Removal in Hot-Dip Galvanizing with Combined Traveling Magnetic Field

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MATERIALS 2024年第19期17卷 4799-4799页

作者： Luo, Xianwen Lu, Haibiao Zhong, Yunbo Ren, Weili Lei, Zuosheng Shanghai Univ State Key Lab Adv Special Steel Shanghai 200444 Peoples R China Shanghai Univ Shanghai Key Lab Adv Ferromet Shanghai 200444 Peoples R China

The removal of zinc dross, which continuously generates and partially floats on a molten zinc surface, has been a persistent challenge during hot-dip galvanizing. Herein, a three-dimensional mathematical model coupled with the electromagnetic field, flow field and air-knife jet flow was established to investigate the flow and zinc dross removal in a zinc pot. Two types of traveling magnetic field combined modes (Mode 1 and Mode 2) were compared. The surface dross removal efficiency was introduced to evaluate the ability of the zinc flow field to compel the movement of zinc dross. The research findings indicate that, in comparison to the influence of strip steel line speed, both the electromagnetic field and air-knife jet have a more pronounced effect on altering the flow characteristics of a molten zinc at surface. The dross removal efficiency for Mode 1 is much far superior to that of Mode 2. With an increase in the driving current, the dross removal efficiency increases while the excessive driving current cannot promote the dross removal efficiency significantly.

关键词： hot-dip galvanizing zinc dross electromagnetic-driven flow air-knife jet flow field

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Investigation on PECVD-deposited SiO 2 underlayer in permalloy-based magnetoelectronic devices

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JOURNAL OF ALLOYS AND COMPOUNDS 2024年 992卷

作者： Tian, Jinpeng Wang, Baojie Song, Qiuming Duan, Tianli Zhang, Xueying Lv, Zhijian Zhang, Zhixing Chen, Yulong Zhang, Wenwei Jia, Yuan Shenzhen Technol Univ Sino German Coll Intelligent Mfg Industrializat Ctr Micro & Nano ICs & Devices Shenzhen 518118 Peoples R China Beihang Univ Beihang Hangzhou Innovat Inst Yuhang Hangzhou 311121 Peoples R China Truth Instruments Co Ltd Qingdao 266000 Peoples R China

This study presents a comprehensive investigation into the dependence among processing conditions, surface properties of the PECVD-deposited SiO 2 underlayer, and their consequential impact on the magnetic and film properties of permalloy. The key exploration parameters involve variations in deposition temperature and annealing temperature. By varying the parameters, microstructure changes within SiO 2 were firstly analyzed. A thorough characterization of in -plane magnetic features of the Ni 81 Fe 19 /SiO 2 multilayer film was then undertaken. The results reveal a significant reliance of magnetic anisotropy and coercivity on PECVD SiO 2 deposition temperatures, particularly evident for deposition temperatures below 350 degrees C. This effect is attributed to the formation of a suboxide SiO x film at a lower deposition temperature, which typically possesses more dangling bond and lattice defects, resulting in the formation of surface granular structures after annealing. These characterizations may lead to the identification of optimized processing conditions, which may be used for enhancing the performance of anisotropic magnetoresistance devices with SiO 2 as an underlayer. Furthermore, the research findings extend beyond anisotropic magnetoresistance systems, with implications for a broad utilization of magnetoelectronic devices. Overall, the study provides a foundation for informed decision -making in the design and optimization of magnetoelectronic devices, in particular for integrated circuit incorporated devices, highlighting the potential for enhanced functionality through manipulation of processing conditions.

关键词： Magnetic anisotropy SiO2 deposition temperature NiFe (111)

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Achieving ultralow friction under high pressure through operando formation of PbS QDs/graphene heterojunction with 0D/1D nanostructure

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CARBON 2024年 218卷

作者： Yin, Xuan Pang, Haosheng Liu, Huan Zhao, Jun Zhang, Bing Liu, Dameng Shi, Yijun Beijing Univ Chem Technol Coll Mech & Elect Engn Beijing 100029 Peoples R China Chinese Aeronaut Estab Beijing 100012 Peoples R China Tsinghua Univ Dept Mech Engn State Key Lab Tribol Adv Equipment Beijing 100084 Peoples R China Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China Lulea Univ Technol Dept Engn Sci & Math Div Machine Elements S-97187 Lulea Sweden

It is a great challenge to utilize graphene for practical applications in moving parts, which meet high contact pressure and atmosphere environments. In this work, ultralow friction (0.054) of graphene was achieved under high contact pressure (1.03 GPa) and atmosphere environment via the operando formation of PbS quantum dots (QDs)/graphene heterojunction at the frictional interface. It is found that PbS QDs are trapped in graphene nanosheets via shear-induced rearrangement for obtaining the PbS QDs/graphene heterojunctions, which pro-vide an excellent rolling effect to lower friction. It is also found that the heterogeneous PbS QDs/graphene tri-bofilms have a strong Pb-enriched function and heterojunction nanorod phase. Our objective is to uncover the physical and chemical mechanisms governing the friction of 0D/1D nanostructures within PbS QDs/graphene heterostructures through our studies. This research will enhance our comprehension of nanomaterials' frictional behavior while offering valuable guidance and optimization strategies for their application in mechanical en-gineering and functional nanomaterials. Consequently, our efforts aim to foster the advancement of nanoscience and technology, leading to additional scientific and technological breakthroughs.

关键词： Quantum dots Nanocomposites Heterojunction Tribo-physicochemical Interfacial nanostructure

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Time-Controlled Hierarchical Multikeyword Search Over Encrypted Data in Cloud-Assisted IoT

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IEEE INTERNET OF THINGS JOURNAL 2022年第13期9卷 11017-11029页

作者： Liu, Tong Miao, Yinbin Choo, Kim-Kwang Raymond Li, Hongwei Liu, Ximeng Meng, Xiangdong Deng, Robert H. Xidian Univ Sch Cyber Engn Xian 710071 Peoples R China Guilin Univ Elect Technol Guangxi Key Lab Trusted Software Guilin 541004 Peoples R China Univ Texas San Antonio Dept Informat Syst & Cyber Secur San Antonio TX 78249 USA Univ Elect Sci & Technol China Dept Comp Sci & Engn Chengdu 610051 Peoples R China Fuzhou Univ Coll Math & Comp Sci Key Lab Informat Secur Network Syst Fuzhou 350108 Peoples R China Henan Key Lab Network Cryptog Technol Zhengzhou 450001 Peoples R China State Key Lab Math Engn & Adv Comp Zhengzhou 450001 Peoples R China Singapore Management Univ Sch Informat Syst Singapore 178902 Singapore

Internet of Things (IoT) devices and systems are becoming increasingly commonplace, and as such systems scale up, so do the computational and storage requirements. Hence, one recent trend is to outsource data from IoT devices to remote systems. To facilitate both ciphertext retrieval and data confidentiality in the outsourced data, a number of searchable encryption (SE) approaches have been proposed in the literature. However, due to limited keyword space, a number of SE schemes are vulnerable to keyword guessing attacks (KGAs). In addition, existing SE approaches generally do not consider the hierarchical structure in which users at different levels require varying access privileges. Furthermore, existing SE schemes seldom provide time-controlled access control. Therefore, in this article, we propose a time-controlled hierarchical multikeyword search by using a double-server architecture to mitigate KGA. In our approach, we also build a public key tree to support different access permissions for hierarchical users. Formal security analysis shows that our scheme is secure, and extensive experiments demonstrate that our scheme is practical.

关键词： Servers Access control Indexes Cloud computing Encryption Public key Internet of Things Access permissions hierarchical structure Internet of Things (IoT) multikeyword search searchable encryption (SE)

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Analysis of C-armature Deceleration Performance of electromagnetic Pellet Injection System on J-TEXT Tokamak 3

Analysis of C-armature Deceleration Performance of Electroma...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Tang, Junhui Li, Feng Zhang, Weikang Xia, Shengguo He, Junjia School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

electromagnetic launch uses electromagnetic forces that can accelerate objects to hypervelocity in short time. Also due to the controllability of its muzzle velocity and the extremely high responsiveness of whole system, electromagnetic launch technology is considered as another novel way to achieve tokamak device disruption mitigation. Our team has designed a new generation of electromagnetic pellet injection system(EMI). It is able to achieve high-speed injection of the pellet and soft recycle of the armature by using deceleration electromagnetic force. In this paper, the deceleration performance of the C-shaped armature during the deceleration process is analyzed through simulations. The simulation results show that the electromagnetic force of the C-shaped armature's tail during deceleration causes the contact performance between the armature and the rail to deteriorate, and also the armature muzzle velocity cannot meet the requirements of soft recycle. The results of the launch experiments with different decelerated current amplitudes further veriFy the correctness of the simulation analysis and provide ideas for the next design of armatures suitable for EMI. © 2022 IEEE.

关键词： Recycling

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Analysis of Transient Flow and Inclusion Transport in Vertical-Bending Slab Continuous Caster with Mold electromagnetic Stirring

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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 2024年第6期55卷 5052-5067页

作者： Lu, Haibiao Xie, Xiaochen Zhong, Yunbo Cheng, Changgui Ren, Weili Lei, Zuosheng Shanghai Univ State Key Lab Adv Special Steel Shanghai 200444 Peoples R China Shanghai Univ Shanghai Key Lab Adv Ferromet Shanghai 200444 Peoples R China Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Hubei Peoples R China Wuhan Univ Sci & Technol Hubei Prov Key Lab New Proc Ironmaking & Steelmaki Wuhan 430081 Hubei Peoples R China

To evaluate the metallurgical effect of mold electromagnetic stirring (EMS), the large eddy simulation (LES) model coupled with discrete phase model was developed to investigate the transient fluid flow, solidification, and inclusion transport in a vertical-bending slab continuous caster under mold EMS. Both the accuracy of predicted magnetic flux density and shell thickness were validated by comparison with the measured data. The results show that the flow field is transiently asymmetric without EMS, the variation of temperature field, solidified shell thickness, and inclusion distribution within the solidified shell are closely related to the flow pattern. Most of inclusions would aggregate at the mold inner radius owing to the buoyancy. The application of EMS can improve transient asymmetry of flow pattern within the mold through controlling the horizonal flow, which can further homogenize temperature and solidified shell thickness, increase removal rate of inclusions, and improve the uniformity of inclusion distribution within the slab. Meanwhile, EMS can also benefit to the cleanliness of subsurface due to its washing effect. Finally, the industrial application also verified the superiority of EMS, in which the area fraction of large size inclusions decreases to 3.2 ppm under the EMS current of 600 A.

关键词： Flow patterns

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A study on the mechanical properties of polycrystalline aluminum nitride based on molecular dynamics simulation

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MATERIALS TODAY NANO 2025年 29卷

作者： Li, Rui Cheng, Chunmin Dong, Fang Wu, Gai Shen, Wei Liang, Kang Wang, Shizhao Liu, Sheng Wuhan Univ Sch Power & Mech Engn Wuhan 430072 Peoples R China Wuhan Univ Inst Technol Sci Wuhan 430072 Peoples R China Wuhan Univ Hubei Key Lab Elect Mfg & Packaging Integrat Wuhan 430072 Peoples R China Wuhan Univ Shenzhen Res Inst Shenzhen 518057 Peoples R China

In the actual preparation process of surface acoustic devices and power devices, AlN mostly has a polycrystalline structure, and the average grain size has a significant effect on its physical properties. In addition, owing to its high temperature resistance, AlN has a wide operating temperature range. Therefore, in order to reveal the effect of average grain size and temperature on the variation of microscopic mechanical properties of polycrystalline AlN, the molecular dynamics method was adopted to study the tensile process of polycrystalline AlN. The results indicated that the elastic modulus and lattice phase transition of polycrystalline AlN are closely related to the average grain size and loading temperature. The larger the average grain size, the higher the elastic modulus. As an important location for crack initiation and propagation, grain boundary plays an important role in the occurrence of high strain failure and lattice phase transition in the system under loading. In addition, the brittle fracture process of polycrystalline AlN is changed to a certain extent with the increase of temperature, and the fracture toughness is gradually enhanced.

关键词： Polycrystalline Aluminum nitride Molecular dynamics simulation Mechanical property

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Sensitive strain sensors with wide-range detection and high stability for intelligent human motion monitoring

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SENSORS AND ACTUATORS A-PHYSICAL 2024年 377卷

作者： Liu, Yamin Chen, Changxin Chen, Di Miao, Jianmin Cui, Daxiang Yu, Jiajie Guo, Yiping Li, Qichao Shanghai Jiao Tong Univ State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Natl Key Lab Adv Micro & Nano Manufacture Technol Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Frontiers Sci Ctr Transformat Mol Sch Chem & Chem Engn Shanghai 200240 Peoples R China Natl Engn Ctr Res Nanotechnol Shanghai 200241 Peoples R China South China Univ Technol Minist Educ Key Lab Polymer Proc Engn GuangZhou 510640 Peoples R China Beihang Univ Hangzhou Innovat Inst Key Lab Intelligent Sensing Mat & Chip Integrat Te Hangzhou Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn 800 Dongchuan RD Shanghai 200240 Peoples R China

Miniaturized wearable electronic devices with strain sensors as core sensing elements hold significant applications in health monitoring and human-machine interaction. However, it remains a challenge to develop strain sensors with optimal response linearity, a wide detection range, and stability. In this study, to satisfy the above requirements, we construct high-performance wearable strain sensors (rGO-CNTOH@PSE) by a strategy of hybridizing conductive fillers with stretchable substrates. In detail, a synergistic conductive network is developed by adopting OH-containing carbon nanotube (CNTOH) and reduced graphene oxide (rGO) fillers with an appropriate mass ratio. After the network is integrated into a porous silicone elastomer substrate formed by the salt templating method, the developed strain sensor exhibits distinct resolution, consistent repeatability, and superior response linearity across a wide strain detection range of 0.3-303.03 %. Furthermore, the sensor also maintains good response stability over 15000 cycles of strain. We also demonstrate that this strain sensor showing outstanding exceptional detection performance has the capability for full-range human motion detection. A wireless smart electronic glove is developed based on the sensor, which can accurately recognize gesture movements and control a bionic robotic hand to replicate human hand actions, offering the potential for replacing manual tasks (such as, grasping in hazardous environments) in the future.

关键词： Strain sensor Graphene Wide working range Wearable application Human-machine interaction

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Synthesis of Cross-Linked Polyolefin Elastomers with High Performance Yet Good Reprocessability

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INDUSTRIAL & engineering CHEMISTRY RESEARCH 2025年第9期64卷 5080-5086页

作者： Xiao, Yangke Zhu, Liqian Gao, Hanyu Wang, Qingyue Wang, Wen-Jun Li, Bo-Geng Liu, Pingwei Zhejiang Univ Coll Chem & Biol Engn State Key Lab Chem Engn Hangzhou 310058 Peoples R China Univ Quzhou Inst Zhejiang Quzhou 324000 Peoples R China Hong Kong Univ Sci & Technol Dept Chem & Biol Engn Clear Water Bay Hong Kong 999077 Peoples R China

The development of polymer materials with high performance and good reusability is critical to sustainability of the polymer industry. However, the balance of these two aspects in elastomers and rubbers is highly challenging. Here, we report the synthesis of a novel polyolefin elastomer (POE) dynamically cross-linked by an imine-linked boronic ester. It improves the tensile strength at break (sigma) of POE by 148.2%, Young's modulus (E) by 92.6%, and the tensile toughness (U T) by 49.4%, with a slightly decreased elongation at break. The cross-linked POE also has higher thermal resistance than the pristine one and presents a steady storage modulus plateau of 2.8 MPa above 150 degrees C. Moreover, it can be reprocessed with an impressive recovery ratio of U T of 89.7% because of the dynamic exchanges of the boronic ester and imine. Dynamic mechanical analysis shows that the cross-linking of an imine-linked boronic ester has a short characteristic relaxation time of 9.6 min and a low apparent activation energy of 65.1 kJmol-1. Our study on dynamically cross-linked POEs provides a new way for the sustainable development of polymer elastomers.

关键词： Tensile strength

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