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Expedient secondary functions of flexible piezoelectrics for biomedical energy harvesting

Bioactive materials 2023年第4期22卷 291-311页

作者： Yuan Wang Min Hong Jeffrey Venezuela Ting Liu Matthew Dargusch centre for Advanced materials Processing and Manufacturing(AMPAM) The University of QueenslandBrisbaneQueensland4072Australia Centre for Future Materials University of Southern QueenslandSpringfieldQueensland4300Australia

Flexible piezoelectrics realise the conversion between mechanical movements and electrical power by conformally attaching onto curvilinear surfaces,which are promising for energy harvesting of biomedical devices due to their sustainable body movements and/or deformations.Developing secondary functions of flexible piezoelectric energy harvesters is becoming increasingly significant in recent years via aiming at issues that cannot be addressed or mitigated by merely increasing piezoelectric efficiencies.These issues include loose interfacial contact and pucker generation by stretching,power shortage or instability induced by inadequate mechanical energy,and premature function degeneration or failure caused by fatigue fracture after cyclic deformations.Herein,the expedient secondary functions of flexible piezoelectrics to mitigate above issues are reviewed,including stretchability,hybrid energy harvesting,and self-healing.Efforts have been devoted to understanding the state-of-the-art strategies and their mechanisms of achieving secondary functions based on piezoelectric fundamentals.The link between structural characteristic and function performance is unravelled by providing insights into carefully selected progresses.The remaining challenges of developing secondary functions are proposed in the end with corresponding outlooks.The current work hopes to help and inspire future research in this promising field focusing on developing the secondary functions of flexible piezoelectric energy harvesters.

关键词： Flexible piezoelectrics Stretchable Hybrid energy harvesting Self-healing

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Fundamental and progress of Bi_2Te_3-based thermoelectric materials

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Chinese Physics B 2018年第4期27卷 50-74页

作者：洪敏陈志刚邹进 centre of future materials the University of Southern Queensland(USQ) materials Engineering University of Queensland centre for Microscopy and Microanalysis University of Queensland

Thermoelectric materials,enabling the directing conversion between heat and electricity,are one of the promising candidates for overcoming environmental pollution and the upcoming energy shortage caused by the over-consumption of fossil fuels.Bi2Te3-based alloys are the classical thermoelectric materials working near room temperature.Due to the intensive theoretical investigations and experimental demonstrations,significant progress has been achieved to enhance the thermoelectric performance of Bi2Te3-based thermoelectric materials.In this review,we first explored the fundamentals of thermoelectric effect and derived the equations for thermoelectric properties.On this basis,we studied the effect of material parameters on thermoelectric properties.Then,we analyzed the features of Bi2Te3-based thermoelectric materials,including the lattice defects,anisotropic behavior and the strong bipolar conduction at relatively high temperature.Then we accordingly summarized the strategies for enhancing the thermoelectric performance,including point defect engineering,texture alignment,and band gap enlargement.Moreover,we highlighted the progress in decreasing thermal conductivity using nanostructures fabricated by solution grown method,ball milling,and melt spinning.Lastly,we employed modeling analysis to uncover the principles of anisotropy behavior and the achieved enhancement in Bi2Te3,which will enlighten the enhancement of thermoelectric performance in broader materials

关键词： thermoelectric Bi2Te3-based alloys electron transports phonon scatterings

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Optimization of sodium hydroxide for securing high thermoelectric performance in polycrystalline Sn1−xSe via anisotropy and vacancy synergy

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InfoMat 2020年第6期2卷 1201-1215页

作者： Xiao-Lei Shi Wei-Di Liu Ang-Yin Wu Van TNguyen Han Gao Qiang Sun Raza Moshwan Jin Zou Zhi-Gang Chen Centre for Future Materials University of Southern QueenslandSpringfield CentralQueenslandAustralia materials Engineering The University of QueenslandBrisbaneQueenslandAustralia centre for Microscopy and Microanalysis The University of QueenslandBrisbaneAustralia

The morphology and composition are two key factors to determine the thermoelectric performance of aqueously synthesized tin selenide(SnSe)crystals;however,their controlling is still under exploring.In this study,we report a high figure-of-merit(ZT)of1.5 at 823 K in p-type polycrystalline Sn1−xSe resulted from a synergy of morphology control and vacancy optimization,realized by carefully tuning the sodium hydroxide(NaOH)concentration during solvothermal synthesis.After a comprehensive investigation on various NaOH concentrations,it was found that an optimized NaOH amount of 10 mL with a concentration of 10 mol L^−1 can simultaneously achieve a large average crystal size and a high Sn vacancy concentration of2.5%.The large microplate-like crystals lead to a considerable anisotropy in the sintered pellets,and the high Sn vacancy level contributes to an optimum hole concentration to the level of2.3×10^19 cm^−3,and in turn a high power factor of7.4μW cm^−1 K^−2 at 823 K,measured along the direction perpendicular to the sintering pressure.In addition,a low thermal conductivity of0.41 W m^−1 K^−1 is achieved by effective phonon scattering at localized crystal imperfections including lattice distortions,grain boundaries,and vacancy domains,as observed by detailed structural characterizations.Furthermore,a competitive compressive strength of52.1 MPa can be achieved along the direction of high thermoelectric performance,indicating a mechanically robust feature.This study provides a new avenue in achieving high thermoelectric performance in SnSe-based thermoelectric materials.

关键词： anisotropy sodium hydroxide thermoelectric tin selenide vacancy

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Recent advances in fire-retardant rigid polyurethane foam

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Journal of materials Science & Technology 2022年第17期112卷 315-328页

作者： Menghe Zhu Zhewen Ma Lei Liu Jianzhong Zhang Siqi Huo Pingan Song materials Engineering Zhejiang A&F UniversityHangzhou311300China School of materials Science and Engineering Tongji UniversityShanghai 201804China Laboratory of Polymer materials and Engineering NingboTech UniversityNingbo 315100China Centre for Future Materials University of Southern QueenslandSpringfield 4300Australia

Driven by global environmental concerns,many efforts have been made to develop halogen-free flame retardants for rigid polyurethane foam(RPUF).These environmentally benign flame retardants are mainly divided into(i)reactive,(ii)additive,and(iii)coating types.The last decade has witnessed great progress of these three strategies,which enhance the fire safety of RPUF and maintain even improve the thermal insulation properties.This comprehensive review focuses on the up-to-date design of the reactive,additive,and coating flame retardants,and their effects on flame retardancy and thermal conductivity of RPUF.Moreover,the practical applications of the as-prepared flame-retardant RPUFs are highlighted.Finally,key challenges associated with these three kinds of flame retardants are discussed and future research opportunities are also proposed.

关键词： Rigid polyurethane foam Flame retardancy Thermal conductivity Halogen-free flame retardants

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Enhancing thermoelectric performance of Cu-modified Bi0.5Sb1.5Te3 by electroless plating and annealing

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Progress in Natural Science:materials International 2018年第2期28卷 218-224页

作者： Zhongyue Huang He Zhang Kun Zheng Xueting Dai Yuan Yu Hefa Cheng Fangqiu Zu Zhi-Gang Chen School of materials Science & Engineering Hefei University of Technology Institute of Microstructure and Properties of Advanced materials Beijing University of Technology Centre for Future Materials University of Southern Queensland materials Engineering The University of Queensland

With the capacity of energy conversion from heat to electricity directly, thermoelectric materials have been considered as an alternative solution to global energy crisis. In this work, Cu modified Bi0.5Sb1.5Te3(BST)composites are prepared by a facile electroless plating Cu method, spark plasma sintering, and annealing. The annealed 0.22 wt.%Cu/BST has an enhanced peak Figure of Merit(z T) of0.71 at 573 K with high average z T of0.65 in the wide temperature range between 300 and 573 K. Due to the significant increase of electrical conductivity and low lattice thermal conductivity, the annealed 0.22 wt.%Cu/BST shifts peak z T to high temperature, and shows 492% enhancement than that of pristine BST with z T of 0.12 at 573 K. Through detailed structural characterization of the annealed 0.22 wt.%Cu/BST, we found that Cu can dope into BST matrix and further form Cu2 Te nanoprecipitates, dislocations, and massive grain boundaries, leading to a low lattice thermal conductivity of 0.30 Wm-1 K-1 in the annealed 0.22 wt.%Cu/BST. Such enhanced peak z T in high-temperature and high average z T in the wide temperature range shows that the electroless plating Cu method and annealing can improve the thermoelectric performance of commercial BST and expand the applicability of Bi2Te3thermoelectric materials in the power generations.

关键词： Bi0.5Sb1.5Te3 Thermoelectric materials Electroless plating Annealing Average zT

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Recent advances in nacre-inspired anisotropic thermally conductive polymeric nanocomposites

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Nano Research 2023年第1期16卷 1362-1386页

作者： Qiang Chen Zhewen Ma Mingchao Wang Zhengzhou Wang Jiabing Feng Venkata Chevali Pingan Song Department of Polymer materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China Key Laboratory of Advanced Civil Engineering materials(Tongji University) Ministry of EducationShanghai 201804China centre for Theoretical and Computational Molecular Science Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt LuciaQLD 4072Australia Centre for Future Materials University of Southern QueenslandSpringfield 4300Australia

The rapid development of miniaturized,highly integrated,and multifunctional modern electronic devices has generated a growing demand for anisotropic heat dissipation in polymer nanocomposites for thermal management applications.These anisotropic thermally conductive multifunctional polymer nanocomposites use bio-inspired structural design based on natural nacre,which is the gold standard for biomimetics.However,to date,a comprehensive review and critique on the highly-anisotropic thermal conduction of nacre-mimetic nanocomposites is nonexistent.As such,this extensive review of the nacre-inspired highly anisotropic thermal management nanocomposites summarizes the current design strategies,and explains the thermal conduction mechanisms,and factors affecting anisotropic thermal conductivity.Furthermore,the practical applications of the asprepared nacre-inspired highly anisotropic nanocomposites are highlighted.Finally,the key challenges and potential solution strategies associated with these nacre-inspired highly anisotropic nanocomposites are discussed and outlooks for future research opportunities are also proposed.

关键词： nacre-inspired structure high anisotropy thermal conductivity nanocomposites

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Non-thermal plasma enhances performances of biochar in wastewater treatment and energy storage applications

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Frontiers of Chemical Science and Engineering 2022年第4期16卷 475-483页

作者： Rusen Zhou Xiaoxiang Wang Renwu Zhou Janith Weerasinghe Tianqi Zhang Yanbin Xin Hao Wang Patrick Cullen Hongxia Wang Kostya(Ken)Ostrikov College of Environmental Science and Engineering Dalian Maritime UniversityDalian 116026China School of Chemistry and Physics and QUT centre for materials Science Queensland University of TechnologyQLD 4000Australia School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Centre for Future Materials University of Southern QueenslandQLD 4350Australia

Surface functionalization or modification to introduce more oxygen-containing functional groups to biochar is an effective strategy for tuning the physicochemical properties and promoting follow-up applications.In this study,non-thermal plasma was applied for biochar surface carving before being used in contaminant removal and energy storage applications.The results showed that even a low dose of plasma exposure could introduce a high number density of oxygen-functional groups and enhance the hydrophilicity and metal affinity of the pristine biochar.The plasma-treated biochar enabled a faster metal-adsorption rate and a 40%higher maximum adsorption capacity of heavy metal ion Pb^(2+).Moreover,to add more functionality to biochar surface,biochar with and without plasma pre-treatment was activated by KOH at a temperature of 800℃.Using the same amount of KOH,the plasma treatment resulted in an activated carbon product with the larger BET surface area and pore volume.The performance of the treated activated carbon as a supercapacitor electrode was also substantially improved by>30%.This study may provide guidelines for enhancing the surface functionality and application performances of biochar using non-thermal-based techniques.

关键词： non-thermal plasma surface functionalization biochar modification wastewater treatment supercapacitor

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Microstructure and wear characteristics of ATZ ceramic particle reinforced gray iron matrix surface composites

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China Foundry 2018年第3期15卷 167-172页

作者： Xue Ma Liang-feng Li Fan Zhang Zu-hua Zhang Hao Wang En-ze Wang School of materials Science and Engineering Southwest University of Science and Technology Chengdu Aerospace Superalloy Technology Co. Ltd Centre for Future Materials University of Southern Queensland

The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating progress. The microstructure was observed by scanning electron microscopy(SEM); the phase constitutions was analyzed by X-ray diffraction(XRD); and the hardness and wear resistance of selected specimens were tested by hardness testing machine and abrasion testing machine, respectively. The addition of high carbon ferrochromium powders leads to the formation of white iron during solidifi cation. The wear volume loss rates of ATZ ceramic particle reinforced gray iron matrix surface composite decreases fi rst, and then tends to be stable. The wear resistance of the composite is 2.7 times higher than that of gray iron matrix. The reason is a combination of the surface hardness increase of gray iron matrix and ATZ ceramic particles and alloy carbides protecting effect on gray iron matrix.

关键词： metal-matrix surface composites pressureless infiltrating particle-reinforcement surface alloying wear testing

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Flexible and flame-retarding phosphorylated MXene/polypropylene composites for efficient electromagnetic interference shielding

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Journal of materials Science & Technology 2022年第16期111卷 66-75页

作者： Tingting Tang Shanchi Wang Yue Jiang Zhiguang Xu Yu Chen Tianshu Peng Fawad Khan Jiabing Feng Pingan Song Yan Zhao College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123China China-Australia Institute for Advanced materials and Manufacturing Jiaxing UniversityJiaxing 314001China AECC Beijing Institute of Aeronautical materials Beijing 100095China Centre for Future Materials University of Southern QueenslandSpringfield CentralQLD 4300Australia

Flame-retardant composites with high electromagnetic interference(EMI)shielding performance are desirable for electronic device packaging.Despite great potential of MXene for high EMI,it still remains a great challenge to develop high-performance flame-retardant polymer/MXene composites with excellent EMI shielding effectiveness because of the poor oxidative stability of MXene.Herein,phosphorylated MXene/polypropylene(PP)composites are prepared by coating phosphorylated MXene on PP fabric followed by spraying polyethylenimine(PEI)and hot-pressing.The phosphorylated MXene proves to be more durable against oxidation than pure MXene due to the protection effect of polyphosphates.Upon hot-pressing,melted PP fibers are fused together at their contact points and thus as-prepared composites are bi-continuous with two interpenetrating phases.The composites show significantly improved thermal stability and flame retardancy relative to pure PP,with a low total heat release(THR)of 3.7 kJ/g and a heat release rate(HRR)of 50.0 W/g,which are reduced by 78%and 87%,respectively.In addition,the composites exhibit a high electrical conductivity of~36,700 S/m and an EMI shielding performance of~90 d B over the whole frequency range of 8–12 GHz with a thickness of~400μm.The as-developed PP/MXene composites hold great promise for reliable protection of next-generation electronic devices working in complex environments.

关键词： MXene Flame retardancy Polypropylene composite EMI shielding

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钢纤维对超高性能混凝土干燥收缩的影响

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材料导报 2017年第23期31卷 58-65页

作者：吴林妹史才军张祖华王浩湖南大学土木工程学院长沙410082 Centre for Future Materials University of Southern Queensland

研究了在(20±2)℃、相对湿度为(50±5)%的环境中钢纤维体积掺量为0%、1%、2%和3%的超高性能混凝土(UHPC)的干燥收缩。结果表明:UHPC在前7d的干燥收缩发展速率较快,7d后发展速率逐渐减缓;但当钢纤维掺量超过2%后,钢纤维对干燥收缩的改... 详细信息

研究了在(20±2)℃、相对湿度为(50±5)%的环境中钢纤维体积掺量为0%、1%、2%和3%的超高性能混凝土(UHPC)的干燥收缩。结果表明:UHPC在前7d的干燥收缩发展速率较快,7d后发展速率逐渐减缓;但当钢纤维掺量超过2%后,钢纤维对干燥收缩的改善作用明显降低,相比钢纤维掺量为2%的UHPC,3%掺量UHPC的干燥收缩仅仅降低了1.5%。钢纤维高弹模及它与基体的界面粘结有效降低了混凝土的干燥收缩,但钢纤维掺量过多可导致多孔薄弱的界面区增加,从而使其对混凝土的收缩抑制作用减小。粉煤灰对超高性能混凝土干燥收缩的抑制作用大于矿粉。提出的新的数学拟合指数公式相比于文献中常用的ACI和王铁梦公式与实测结果吻合度更好。

关键词：超高性能混凝土钢纤维粉煤灰矿粉干燥收缩数学拟合

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