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Micromechanics of Thermal Conductive Composites:Review,Developments and Applications

Acta Mechanica Solida Sinica 2024年第2期37卷 215-237页

作者： Guannan Wang Yulin Huang mengyuan gao Qiang Chen Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China

Micromechanics investigations of composites with fiber-shaped reinforcement are extensively applied in the engineering design and theoretical analysis of thermal composites in the aerospace engineering and high-tech industry.In this paper,a critical review of various classical micromechanics approaches is provided based on the classification framework and the development of micromechanics tools.Several numerical micromechanics tools have been developed to overcome limitations through exactly/approximately solving the internal governing equations of microstructures.The connections and limitations of those models are also investigated and discussed,based on which three recently developed numerical or semi-analytical models are explained,including finite-element micromechanics,finite-volume direct averaging micromechanics,and locally exact homogenization theory,as well as machine learning tools.Since it is almost inevitable to mention the interfacial effects on thermal behavior of fibrous composites,we review the new mathematical relations that interrupt the original continuity conditions due to the existence of interphase/interface within unit cells.Generally speaking,the interphase/interface is demonstrated to play a significant role in influencing the effective coefficients and localized thermal fields.The present work also briefly reviews the application of micromechanics tools in emerging engineered woven composites,natural fibrous composites,and ablative thermal protection composites.It is demonstrated that sophisticated micromechanics tools are always demanded for investigating the effective and localized responses of thermal fibrous composites.

关键词： Micromechanics models Thermal fibrous composites Microstructural detail-free models Semi-analytical and numerical methods Interfacial effects Woven composites Natural composites

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Poly(lactic acid)-aspirin microspheres prepared via the traditional and improved solvent evaporation methods and its application performances

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中国化学工程学报:英文版 2023年第8期60卷 194-204页

作者： Xiaolin Pan mengyuan gao Yun Wang Yanping He Tian Si Yanlin Sun School of Chemical Engineering Kunming University of Science and TechnologyKunming 650504China

Drug-loaded microspheres are significant for the development of modern pharmaceutical products. It is well known that the taken of aspirin for long-term increases the risk of serious gastrointestinal complications, therefore a controllable delivery of aspirin is of importance to lighten those side effects. In this work, poly(lactic acid)(PLA) was chosen as the carrier to prepare PLA-aspirin microspheres by using the traditional and the improved solvent evaporation methods. It was found that no matter which experimental condition was, the encapsulation efficiency of aspirin was higher by using the improved method than that of the traditional method. Specifically, when the concentration of polyvinyl alcohol = 1%(mass),the polymer concentration = 1:20, the oil/water rate = 1:2.5, PLA-aspirin microspheres were obtained via the improved method with a high yield of 82.83%(mass) and an encapsulation efficiency of 44.09%. PLAaspirin microspheres were then prepared continuously using the improved method, which further enhanced the encapsulation efficiency to 54.56%. Approximate 85% aspirin released from microspheres within 7 days. Obvious degradation which was represented by reduction on hardness was observed by soaking microspheres in PBS for 60 days. This work is of interest because it provides a continuous route to prepare PLA-aspirin microspheres continuously with a high drug encapsulation efficiency.

关键词： Aspirin Degradation Foam-transfer Microspheres Poly(lactic acid) Slow-release

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8.30%Efficiency P3HT-based all-polymer solar cells enabled by a miscible polymer acceptor with high energy levels and efficient electron transport

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Science China Chemistry 2023年第1期66卷 216-227页

作者： Ziqi Liang Jiangting He Bin Zhao mengyuan gao Yu Chen Long Ye Miaomiao Li Yanhou Geng School of Materials Science and Engineering and Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

P3HT stands out from numerous polymer donors owing to the merits of low cost and high scalability of synthesis.However,the photovoltaic performance of P3HT-based blends lags significantly behind the state-of-the-art systems,especially for all-polymer solar cells(APSCs) that generally show efficiency of around 3%–4% due to the lack of matched polymer acceptors.Herein,a polymer acceptor,named IDTBTC8-CN,was designed and synthesized with indacenodithiophene(IDT) and mono-cyano(CN)-substituted benzothiadiazole(BT-CN) as building blocks.Introducing a CN group endowed the polymer with decreased bandgap,and apparent n-type charge transport character despite the relatively high energy levels.Additionally,IDTBTC8-CN showed largely improved miscibility with P3HT,compared with that of BT-based control polymer IDTBTC8.The high miscibility between P3HT and IDTBTC8-CN as well as the amorphous aggregation behavior of IDTBTC8-CN enabled a broad manipulation room for the blend film to acquire favorable morphology.Eventually,a champion efficiency of 8.30% was achieved,in sharp contrast to that of the IDTBTC8-based system(1.21%).Such efficiency is a new record for P3HT-based APSCs reported so far.Moreover,P3HT:IDTBTC8-CN blend film also exhibited excellent mechanical robustness.This study implies the guidance of molecular design of the polymer acceptors and morphology control for P3HT-based APSCs.

关键词： all-polymer solar cells poly(3-hexylthiophene) polymer acceptors energy levels film morphology

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Advances and prospective in thermally stable nonfullerene polymer solar cells

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Science China Chemistry 2021年第11期64卷 1875-1887页

作者： Long Ye mengyuan gao Jianhui Hou School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin300072China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China

Polymer solar cells(PSCs)featuring nonfullerene acceptors have attracted a great deal of attention in the research community.Exposure of these active layers to sunlight during operation demands excellent thermal stability.Optimizing PSCs often requires a step of thermal annealing,while long-term annealing often places a constraint on their stable operation at elevated temperature and results in a progressive loss of photovoltaic performance.Hence,it is crucial to understand and control the fundamental affecting factors on the thermal stability of nonfullerene PSCs.This review highlights the relationships between microstructure and thermal stability of PSCs and summarizes promising strategies to push this technology toward the level of practical application.Finally,we present the current challenges and prospective of this research area,intending to advance the practical applications of stable PSCs based on nonfullerene acceptors.

关键词： polymer solar cells thermal stability morphology miscibility crystallization

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A generic approach yields organic solar cells with enhanced efficiency and thermal stability

聚集体(英文)

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聚集体(英文) 2023年第2期4卷 318-328页

作者： mengyuan gao Kai Zhang Chunyong He Hanqiu Jiang Xiong Li Qingchun Qi Kangkang Zhou Yu Chen Wenchao Zhao Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)TianjinChina Spallation Neutron Source Science Center DongguanChina Institute of High Energy Physics Chinese Academy of Sciences(CAS)BeijingChina Mettler Toledo ShanghaiChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina

The use of deuterium are critical for promoting the fundamental understanding of aggregate materials and their new functions.Particularly,the solution structure of conjugated polymers can be hardly resolved without deuteration.However,studies about the isotopic effects of casting solvents on the aggregated structures of photovoltaic polymers and their bulk-heterojunction blends are deficient.Here,the impact of deuterated solvents on the thermal behavior,aggregated structures,and device performance of photovoltaic polymers is clearly delineated for the first time by multiple techniques.The enhanced π-π stacking order of photovoltaic polymers is highly relevant to their relatively poor miscibility with deuterated solvents.Benefiting from higher crystallinity and optimized morphology of deuterated solvents processed films,the devices are able to achieve better efficiency and notable improvement in thermal stability.Our results highlight the isotopic effects of solvents on the aggregated structure of conjugated polymer systems and reveal the potential of innovative approaches to fabricate thermally stable high-efficiency solar cells.

关键词： deuterated solvent organic solar cells phase separation scattering thermal stability

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Control of aggregated structure of photovoltaic polymers for high-efficiency solar cells

Aggregate

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Aggregate 2021年第5期2卷 62-99页

作者： mengyuan gao Wenxuan Wang Jianhui Hou Long Ye Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjinChina Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhouChina

π-Conjugated organic/polymer materials-based solar cells have attracted tremendous research interest in the fields of chemistry,physics,materials science,and energy science.To date,the best-performance polymer solar cells(PSCs)have achieved power conversion efficiencies exceeding 18%,mostly driven by the molecular design and device structure optimization of the photovoltaic materials.This review article provides a comprehensive overview of the key advances and current status in aggregated structure research of PSCs.Here,we start by providing a brief tutorial on the aggregated structure of photovoltaic polymers.The characteristic parameters at different length scales and the associated characterization techniques are overviewed.Subsequently,a variety of effective strategies to control the aggregated structure of photovoltaic polymers are discussed for polymer:fullerene solar cells and polymer:nonfullerene small molecule solar cells.Particularly,the control strategies for achieving record efficiencies in each type of PSCs are highlighted.More importantly,the in-depth structure-performance relationships are demonstrated with selected examples.Finally,future challenges and research prospects on understanding and optimizing the aggregated structure of photovoltaic polymers and their blends are provided.

关键词： aggregated structure photovoltaic polymers polymer solar cells power conversion efficiency small molecule acceptors

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考虑Steigmann-Ogden界面的复合材料远场解析解

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Acta Mechanica Sinica 2024年第1期40卷 35-43页

作者：高梦园贺哲龙 Ougbe Anseme Ahehehinnou 王冠楠 Department of Civil Engineering Zhejiang UniversityHangzhou 310058China Center for Balance Architecture Zhejiang UniversityHangzhou 310007China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

本文给出了含有纳米纤维或孔隙的二维异质材料在远场载荷作用下的Steigmann-Ogden弹性面的解析解.该求解与最近文献中复函数法的数值结果进行了验证,并提供了具体位移和应力场的闭式表达式.数值研究了表面弹性参数、表面残余应力、纤维... 详细信息

本文给出了含有纳米纤维或孔隙的二维异质材料在远场载荷作用下的Steigmann-Ogden弹性面的解析解.该求解与最近文献中复函数法的数值结果进行了验证,并提供了具体位移和应力场的闭式表达式.数值研究了表面弹性参数、表面残余应力、纤维/孔径和远场载荷对局部应力分布的影响.结果表明,表面弹性参数会扰乱纤维域内的内应力,而表面弯曲刚度参数会显著影响应力集中,这与经典Eshelby问题中的均匀应力分布不同.分析表达式揭示了一些有趣的现象,例如,纤维复合材料在静水载荷作用下的应力/位移场仅与表面Lamé参数有关,剪切载荷作用下分析表达式中的非常数系数保持为单轴拉伸载荷作用下的两倍,这些都是本文首次报道的.所建立的解决方案对于准确捕捉具有显著表面效应的纳米复合材料的力学响应至关重要.

关键词：纳米复合材料异质材料表面效应纤维复合材料弹性参数载荷作用剪切载荷弯曲刚度

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Towards a bright future:The versatile applications of organic solar cells

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Materials Reports(Energy) 2021年第4期1卷 34-44页

作者： Junjiang Wu mengyuan gao Yubo Chai Pengke Liu Bo Zhang Junwei Liu Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityTianjin300350PR China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun130033PR China

Due to the mechanical flexibility,light weight,aesthetics,absorption tunability and environmental friendliness,organic solar cells(OSCs)have superior application potential over their inorganic counterparts including silicon and perovskite solar cells(PSCs).Thanks to these benefits,the past decade have witnessed the rapid growth of flexible OSCs,semitransparent OSCs and indoor OSCs.In this progress report,we firstly overview the recent advance of the applications of the three promising OSCs.Subsequently,we sketch the critical points for the three classes of OSCs and highlight the efforts paid by the research community to address these issues.Besides,we discuss some popular strategies to afford great performance of each kind of OSC,respectively,and underline the corresponding breakthrough directions.Last but not least,we present the remaining challenges for advancing the commercial applications of these three classes of OSCs.

关键词： Organic photovoltaics Semi-transparent devices Flexibility Greenhouses Indoor solar cells OSCs

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High T_(g) Polymer Insulator Yields Organic Photovoltaic Blends with Superior Thermal Stability at 150℃

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Chinese Journal of Chemistry 2021年第9期39卷 2570-2578页

作者： Fei Chen Ying Zhang Qi Wang mengyuan gao Nigel Kirby Zhongxiang Peng Yunfeng Deng Miaomiao Li Long Ye School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Australian Synchrotron ClaytonVictoria 3168Australia Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin Universityand Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhouGuangdong 510640China

Record-breaking organic solar cells(OSCs)based on blends of polymer donors and small molecule acceptors often show undesirable degradati on,which severely precludes their practical use.Herei n,we demonstrate a facile and cost-effective approach to con struct thermally stable OSCs at 150℃ by incorporating a small amount of a polymer insulator polyacenaphthylene(PAC)with high glass-transition temperature over 230℃ into polymer:acceptor blends.The model PTB7-Th:EH-IDTBR blend with 10 wt%PAC maintained above 85%of its initial efficiency upon continuous heating at 150℃ for over 800 h,while the efficiency of the blend without PAC sharply dropped by 70%after-300 h.Owing to high miscibility with acceptors,PAC confines the motion of the acceptor molecules and suppresses the acceptor crystallization at elevated temperatures,leading to significantly improved stability.Importantly,the effectiveness of this blending approach was also validated in many other OSC systems,showing great potential for achieving high-performance thermally stable electronics.

关键词： Energy conversion Thin films Polymer insulator Thermal stability Crystal growth

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Thermally stable poly(3-hexylthiophene):Nonfullerene solar cells with efficiency breaking 10%

Aggregate

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Aggregate 2022年第5期3卷 205-216页

作者： mengyuan gao Yang Liu Kaihu Xian Zhongxiang Peng Kangkang Zhou Junwei Liu Saimeng Li Fei Xie Wenchao Zhao Jidong Zhang Xuechen Jiao Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityTianjinChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina

Solar cells featuring polythiophenes as donors are one of the optoelectronic devices that hold notable promises for commercial application,profiting from the lowest synthetic complexity and excellent scalability.However,the complex phase behaviors of polythiophenes and their blends put constraints on modulating electrical performance and thus realizing stable performance under thermal stress.In this contribution,we present a multi-technique approach that combines calorimetry,scattering,spectroscopy,and microscopy to thoroughly probe the thermodynamic mixing,thermal properties of materials,the evolution of nanoscale domain structure,and device performance of poly(3-hexylthiophene)(P3HT)with a range of nonfullerene acceptors(NFAs)such as ITIC,IDTBR,and ZY-4Cl.Accordingly,two blending guidelines are established for matching these popular NFAs with P3HT to enable highly efficient and thermally stable cells.First,blend systems with weak vitrification and hypo-miscibility are excellent candidates for efficient solar cells.Furthermore,high thermal stability can be achieved by selecting NFAs with diffusion-limited crystallization.The P3HT:ZY-4Cl blend was found to endow the best performance of over 10%efficiency and an exceptionally high T_(80) lifetime of>6000 h under continuous thermal annealing,which are among the highest values for P3HT-based solar cells.This realization of high thermal stability and efficiency demonstrates the remarkable potentials of simple polythiophene:nonfullerene pairs in electronic applications.

关键词： multi-technique approach organic solar cells phase separation polythiophene thermal stability

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