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Chinese Journal of Polymer Science 2009年第5期27卷 685-694页

作者： yiu-wing mai Center for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringJ07University of Sydney

Nano-sized silica particles were modified with methacryloxy-propyltrimethoxysilane(MPS) followed by in situ copolymerization of methyl methacrylate(MMA) and butyl acrylate(BA).These modified nanoparticles were compounded with polypropylene(PP) to prepare PP/silica *** grafted on nano-silica enhances the dispersion of the nanoparticles and interfacial adhesion,decreases the size of PP spherulites in nanocomposites and leads to increasing the Young's modulus and toughness of PP/silica nanocomp...

关键词： Nano composites Interface Mechanical properties.

Fracture mechanics analysis on Smart-Cut~*** 2:Effect of bonding flaws

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Acta Mechanica Sinica 2009年第2期25卷 197-203页

作者： Bin Gu Hongyuan Liu yiu-wing mai Xi Qiao Feng ShouWen Yu Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and MechatronicEngineering (AMME) J07 University of SydneySydney NSW 2006 Australia Department of Engineering Mechanics Tsinghua University Beijing 100084 China

In Part 2 of the paper on the Smart-Cut process, the effects of bonding flaws characterized by the size and internal pressure before and after splitting are studied by using fracture mechanics models. It is found that the bonding flaws with large size are prone to cause severe deviation of defect growth, leading to a non-transferred area of thin layer when splitting. In a practical Smart-Cut process where the internal pressure of bonding flaws is very small, large interfacial defects always promote defect growth in the splitting process. Meanwhile, increasing the internal pressure of the bonding flaws decreases the defect growth and its deviation before splitting. The mechanism of relaxation of stiffener constraint is proposed to clarify the effect of bonding flaws. Moreover, the progress of the splitting process is analyzed when bonding flaws are present. After splitting, those bonding flaws with large size and high internal pressure are vulnerable for the blistering of the thin film during high-temperature annealing.

关键词： Smart-Cut technology Fracture mechanics Stress intensity factor Interfacial defect

Fracture mechanics analysis on Smart-Cut~ *** 1:Effects of stiffening wafer and defect interaction

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Acta Mechanica Sinica 2009年第1期25卷 73-81页

作者： Bin Gu Hongyuan Liu yiu-wing mai Xi Qiao Feng Shou Wen Yu Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and MechatronicEngineering (AMME) J07 University of SydneySydney NSW 2006 Australia Department of Engineering Mechanics Tsinghua University 100084 Beijing China

In the present paper, continuum fracture mechanics is used to analyze the Smart-Cut process, a recently established ion cut technology which enables highly efficient fabrication of various silicon-on-insulator （SOI） wafers of high uniformity in thickness. Using integral transform and Cauchy singular integral equation methods, the mode-I and mode-II stress intensity factors, energy release rate, and crack opening displacements are derived in order to examine several important fracture mechanisms involved in the Smart-Cut process. The effects of defect interaction and stiffening wafer on defect growth are investigated. The numerical results indi- cate that a stiffener/handle wafer can effectively prevent the donor wafer from blistering and exfoliation, but it slows down the defect growth by decreasing the magnitudes of SIF＇s. Defect interaction also plays an important role in the splitting process of SOI wafers, but its contribution depends strongly on the size, interval and internal pressure of defects. Finally, an analytical formula is derived to estimate the implantation dose required for splitting a SOI wafer.

关键词： Smart-Cut technology Silicon-on-insulatorwafer Crack growth Fracture mechanics Stress intensityfactor

Spider Web‑Inspired Graphene Skeleton‑Based High Thermal Conductivity Phase Change Nanocomposites for Battery Thermal Management

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Nano-Micro Letters 2021年第11期13卷 308-321页

作者： Ying Lin Qi Kang Han Wei Hua Bao Pingkai Jiang yiu‑wing mai Xingyi Huang Shanghai Key Lab of Electrical Insulation and Thermal Ageing The State Key Laboratory of Metal Matrix CompositesDepartment of Polymer Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China University of Michigan‑Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW 2006Australia

Phase change materials(PCMs)can be used for efficient thermal energy harvesting,which has great potential for cost-effective thermal management and energy ***,the low intrinsic thermal conductivity of polymeric PCMs is a bottleneck for fast and efficient heat ***,it is also a challenge to achieve a high thermal conductivity for phase change nanocomposites at low filler *** constructing a three-dimensional(3D)thermally conductive network within PCMs can address these problems,the anisotropy of the 3D framework usually leads to poor thermal conductivity in the direction perpendicular to the alignment of *** by the interlaced structure of spider webs in nature,this study reports a new strategy for fabricating highly thermally conductive phase change composites(sw-GS/PW)with a 3D spider web(sw)-like structured graphene skeleton(GS)by hydrothermal reaction,radial freeze-casting and vacuum impregnation in paraffin wax(PW).The results show that the sw-GS hardly affected the phase transformation behavior of PW at low ***,sw-GS/PW exhibits both high cross-plane and in-plane thermal conductivity enhancements of~1260%and~840%,respectively,at an ultra-low filler loading of 2.25 vol.%.The thermal infrared results also demonstrate that sw-GS/PW possessed promising applications in battery thermal management.

关键词： Thermal conductivity Radial freeze-casting Phase change materials 3D graphene aerogel Thermal management

Flexible,Highly Thermally Conductive and Electrically Insulating Phase Change Materials for Advanced Thermal Management of 5G Base Stations and Thermoelectric Generators

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Nano-Micro Letters 2023年第3期15卷 1-15页

作者： Ying Lin Qi Kang Yijie Liu Yingke Zhu Pingkai Jiang yiu‑wing mai Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Department of Polymer Science and Engineeringthe State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW 2006Australia

Thermal management has become a crucial problem for high-power-density equipment and *** change materials(PCMs)have great prospects in thermal management applications because of their large capacity of heat storage and isothermal behavior during phase ***,low intrinsic thermal conductivity,ease of leakage,and lack of flexibility severely limit their *** one of these problems often comes at the expense of other performance of the *** this work,we report core–sheath structured phase change nanocomposites(PCNs)with an aligned and interconnected boron nitride nanosheet network by combining coaxial electrospinning,electrostatic spraying,and *** advanced PCN films exhibit an ultrahigh thermal conductivity of 28.3 W m^(-1)K^(-1)at a low BNNS loading(i.e.,32 wt%),which thereby endows the PCNs with high enthalpy(>101 J g^(-1)),outstanding ductility(>40%)and improved fire ***,our core–sheath strategies successfully balance the trade-off between thermal conductivity,flexibility,and phase change enthalpy of ***,the PCNs provide powerful cooling solutions on 5G base station chips and thermoelectric generators,displaying promising thermal management applications on high-power-density equipment and thermoelectric conversion devices.

关键词： Coaxial electrospinning Boron nitride nanosheets Phase change nanocomposites Thermal conductivity Thermal management

Unusual thermal properties of graphene origami crease:A molecular dynamics study

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Green Energy & Environment 2022年第1期7卷 86-94页

作者： Ning Wei Yang Chen Kun Cai Yingyan Zhang Qingxiang Pei Jin-Cheng Zheng yiu-wing mai Junhua Zhao Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi214122China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai200072China School of Engineering RMIT UniversityBundooraVIC3083Australia Institute of High Performance Computing A^(*)STAR138632Singapore Department of Physics and the Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen UniversityXiamen361005China Xiamen University Malaysia 439000SepangSelangorMalaysia Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW2006Australia

Graphene is a two-dimensional material that can be folded into diverse and yet interesting nanostructures like macro-scale paper *** of graphene not only makes different morphological configurations but also modifies their mechanical and thermal *** by paper origami,herein we studied systemically the effects of creases,where sp^(2)to sp^(3)bond transformation occurs,on the thermal properties of graphene origami using molecular dynamics(MD)*** MD simulation results show that tensile strain reduces(not increases)the interfacial thermal resistance owing to the presence of the *** unusual phenomenon is explained by the micro-heat flux migration and stress *** findings on the graphene origami enable the design of the next-generation thermal management devices and flexible electronics with tuneable properties.

关键词： Graphene Origami Bond transformation Interfacial thermal resistance Molecular dynamics

Recyclability and Self-Healing of Dynamic Cross-Linked Polyimide with Mechanical/Electrical Damage

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Energy & Environmental Materials 2023年第1期6卷 401-407页

作者： Baoquan Wan Ming-Sheng Zheng Xing Yang Xiaodi Dong Yuchao Li yiu-wing mai George Chen Jun-Wei Zha School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing 100083China Shunde Graduate School of University of Science and Technology Beijing Foshan 528300China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney New South Wales 2006Australia Department of Electronics and Computer Science University of SouthamptonSouthampton SO171BJUK

Recyclability and self-healing are two most critical factors in developing sustainable polymers to deal with environmental pollution and resource *** this work,a dynamic cross-linked polyimide insulation film with full closed-loop recyclability is successfully prepared,which also possesses good self-healing ability after being mechanical/electrical damaged depending on the Schiff base dynamic covalent *** recycled and self-healed polyimide film still maintain its good tensile strength(r t)>60 MPa with Young’s modulus(E)>4 GPa,high thermal stability with glass transition temperature(T g)>220℃,and outstanding insulation property with breakdown strength(E 0)>358 kV mm^(-1),making it a very promising low energy consumption and high temperature resistant insulation *** strategy of using Schiff base dynamic covalent bonds for reversible repairing the structure of high T g polyimides promotes the wider application of such sustainable and recyclable material in the field of electrical power and micro-electronics.

关键词： electrical damage polyimide recyclability self-healing

Hierarchically porous composite fabrics with ultrahigh metal–organic framework loading for zero-energy-consumption heat dissipation

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Science Bulletin 2022年第19期67卷 1991-2000页

作者： Xiangyu Liu Pengli Li Jie Chen Pingkai Jiang yiu-wing mai Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingDepartment of Polymer Science and EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China Centre for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney NSW 2006Australia

The long-term safe operation of high-power equipment and integrated electronic devices requires efficient thermal management,which in turn increases the energy consumption ***,the sustainable development of our society needs advanced thermal management with low,even zero,energy *** water from the atmosphere,followed by moisture desorption to dissipate heat,is an efficient and feasible approach for zero-energy-consumption thermal ***,current methods are limited by the low absorbance of water,low water vapor transmission rate(WVTR)and low stability,thus resulting in low thermal management *** this study,we report an innovative electrospinning method to process hierarchically porous metal–organic framework(MOF)composite fabrics with high-efficiency and zero-energy-consumption thermal *** composite fabrics are highly loaded with MOF(75 wt%)and their WVTR value can be up to 3138 g m^(-2) d^(-1).The composite fabrics also exhibit stable microstructure and *** a conventional environment(30℃,60%relative humidity),the composite fabrics adsorb water vapor for regeneration within 1.5 h to a saturated value Wsat of 0.614 g g^(-1),and a corresponding equivalent enthalpy of 1705.6 J g^(-1).In the thermal management tests,the composite fabrics show a strong cooling capability and significantly improve the performance of thermoelectric devices,portable storage devices and wireless *** results suggest that hierarchically porous MOF composite fabrics are highly promising for thermal management of intermittent-operation electronic devices.

关键词： Metal-organic framework Hierarchically porous materials Adsorption-based cooling Electrospinning

Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

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Science China Materials 2022年第3期65卷 811-819页

作者： Peng Gao Zihao Ma Ji Gu Song Ni Tao Suo Yulong Li Min Song yiu-wing mai Xiaozhou Liao School of Aerospace Mechanical&Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Alloys with combined outstanding strength and excellent ductility are highly desirable for many structural ***,alloys subjected to deformation at very high strain rates and/or cryogenic temperatures usually suffer from very limited ***,we demonstrate that a bulk CrCoNi medium-entropy alloy presents exceptional combination of high strength and excellent ductility during deformation at high strain rates over a wide temperature *** tensile stress-strain curves at a high strain rate of 2000s^(-1) and temperatures down to 77 K were successfully obtained using an electromagnetic Hopkinson tension bar system attached with a cooling device,revealing high true ultimate tensile strength(σ_(UTS,T))of 1.8 GPa and true strain of~54% at σ_(UTS,T).These outstanding mechanical properties were mainly attributed to profuse deformation *** high strain rate and cryogenic temperature promoted deformation *** refinement caused by deformation twinning,dislocation slip and dynamic recrystallisation added to work hardening and the excellent tensile strain.

关键词： medium-entropy alloy strength ductility high strain rate cryogenic temperature

Electrospinning Engineering Enables High‑Performance Sodium‑Ion Batteries

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Advanced Fiber Materials 2022年第1期4卷 43-65页

作者： Chuanping Li Min Qiu Ruiling Li Xuan Li Manxi Wang Jiabo He Ganggang Lin Liren Xiao Qingrong Qian Qinghua Chen Junxiong Wu Xiaoyan Li yiu‑wing mai Yuming Chen College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350000FujianChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350000China State Grid Fujian maintenance Company Fuzhou 350000FujianChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronics Engineering J07The University of SydneySydneyNSW 2006Australia

As a promising energy storage device,sodium-ion batteries(SIBs)have received continuous attention due to their low-cost and environmental ***,the sluggish kinetics of Na ion usually makes SIBs hard to realize desirable electrochemical performance when compared to lithium-ion batteries(LIBs).The key to addressing this issue is to build up nanostructured materials which enable fast Na-ion insertion/***-dimensional(1D)nanocarbons have been considered as both the anode and the matrix to support active materials for SIB electrodes owing to their high electronic conductivity and excellent mechanical *** of their large surface areas and short ion/electron difusion path,the synthesized electrodes can show good rate performance and cyclic stability during the charge/discharge *** is a simple synthetic technology,featuring inexpensiveness,easy operation and scalable production,and has been largely used to fabricate 1D nanostructured *** this review,we frst give a simple description of the electrospinning principle and its capability to construct desired nanostructures with diferent ***,we discuss recent developments of carbon-based hybrids with desired structural and compositional characteristics as the electrodes by electrospinning engineering for ***,we identify future research directions to realize more breakthroughs on electrospun electrodes for SIBs.

关键词： Sodium-ion batteries Electrospinning engineering Carbonaceous substrate Hybrid