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Forced boiling of nonazeotropic immiscible mixture in a supercapillary microchannel array for ultra-high heat flux removal with chip junction temperature below 85℃

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Science China(Technological Sciences) 2024年第5期67卷 1364-1380页

作者： SUN Bo BAO yuchen TIAN Tong LI Ji School of Engineering Science University of Chinese Academy of SciencesBeijing100049China Laboratory of Advanced Thermal Management Technologies School of Engineering ScienceUniversity of Chinese Academy of SciencesBeijing100049China

In this study,a structure-optimized two-phase microchannel heat sink with sintered submicron nucleation sites was developed and *** copper-based microchannels had a rectangular cross-section with an equivalent hydraulic diameter of 222μ*** subcooled flow boiling characteristics were comprehensively compared between pure HFE-7100 and a non-azeotropic,immiscible binary mixture of HFE-7100 and water,considering heating areas of 1 and 5 cm^(2).The total heating power input to the test section were 100–1500 and 250–3000 w for a 1 and 5 cm^(2)heat source,respectively,with a flow rate ranging from 50 to150 L/*** to pure HFE-7100,the non-azeotropic immiscible binary mixture of HFE-7100/water in the sintered porous microchannels exhibited a much higher overall heat transfer coefficient and lower power *** maintain the junction temperature of a high power electronic chip below 85℃,the proposed supercapillary microchannel heat sink could effectively dissipate the heat flux of 1275 w/cm^(2)over 1 cm^(2)heat source and 500 w/cm^(2)over 5 cm^(2)heat *** addition,the volume ratio of the binary mixture strongly influence the two-phase flow heat transfer *** optimal volume ratio exist in terms of the thermal resistance–pumping power minimization(HFE-7100:water=2:8 is recommended in this study).The findings of this investigation on the flow boiling properties of non-azeotropic immiscible mixtures help fill a gap in the related field.

关键词： microchannel sintered powder coating submicron nucleation cavities nonazeotropic immiscible ultra-high heat flux

Fe nanoclusters anchored in biomass waste-derived porous carbon nanosheets for high-performance supercapacitor

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Chinese Chemical Letters 2024年第8期35卷 362-366页

作者： yuchen w.ng Yaoyu Liu Xiongfei Huang Guanjie He Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUnited Kingdom

Metal-nanocluster materials have gradually become a promising electrode candidate for supercapaci-tor *** high-efficient and rational architecture of these metal-nanocluster electrode mate-rials with satisfied supercapacitive performance are full of ***,Fe-nanocluster anchored porous carbon(FAPC)nanosheets were constructed through a facile and low-cost impregnation-activation *** characterization methods documented that FAPC nanosheets possessed a mesopore-dominated structure with large surface area and abundant Fe-N4 active sites,which are crucial for su-percapacitive energy *** optimal FAPC electrode exhibited a high specific capacitance of 378 F/g at a specific current of 1 A/g and an excellent rate capability(271 F/g at 10 A/g),which are comparable or even superior to that of most reported carbon ***,the FAPC-based device achieved a desired specific energy of 14.8 wh/kg at a specific power of 700 w/*** work opens a new avenue to design metal-nanocluster materials for high-performance biomass waste-based supercapacitors.

关键词： Fe nanoclusters Biomass waste Porous carbon nanosheets Supercapacitor Charge transfer

Self-assembled monolayers(SAMs)in inverted perovskite solar cells and their tandem photovoltaics application

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Interdisciplinary Materials 2024年第2期3卷 203-244页

作者： Zijun Yi Xin Li yuchen Xiong Guibin Shen w.nguang Zhang Yihuai Huang Qinghui Jiang Xin Ren ng Yubo Luo Jianghui Zheng wei Lin Leong Fan Fu Tongle Bu Junyou Yang State Key Laboratory of Material Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhanChina China‐Eu Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhanChina School of Electrical and Electronic Engineering Nanyang Technological UniversitySingaporeSingapore Department of Chemistry National University of SingaporeSingaporeSingapore School of Physics The University of SydneySydneyNew South WalesAustralia Laboratory for Thin Films and Photovoltaics Empa‐Swiss Federal Laboratories for Materials Science and TechnologyDübendorfSwitzerland State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina

Self-assembled monolayers(SAMs)employed in inverted perovskite solar cells(PSCs)have achieved groundbreaking progress in device efficiency and stability for both single-junction and tandem configurations,ow.ng to their distinctive and versatile ability to manipulate chemical and physical interface *** this regard,we present a comprehensive review of recent research advancements concerning SAMs in inverted perovskite singlejunction and tandem solar cells,where the prevailing challenges and future development prospects in the applications of SAMs are *** thoroughly examine the mechanistic roles of diverse SAMs in energy-level regulation,interface modification,defect passivation,and charge *** is achieved by understanding how interfacial molecular interactions can be finely tuned to mitigate charge recombination losses in inverted *** this comprehensive review,we aim to provide valuable insights and references for further investigation and utilization of SAMs in inverted perovskite single‐junction and tandem solar cells.

关键词： inverted perovskite solar cells power conversion efficiency self-assembled monolayers tandem

Variation in the surface heat flux on the north and south slopes of Mount Qomolangma

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 28-33页

作者： Yonghao Jiang Maoshan Li yuchen Liu Ting w.ng Pei Xu Yaoming Ma Fanglin Sun School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province Chengdu University of Information TechnologyChengduChina Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesCAS Center for Excellence in Tibetan Plateau Earth SciencesBeijingChina Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy of SciencesLanzhouChina

The distinctive conditions present on the north and south slopes of Mount Qomolangma,along with the intricate variations in the underlying surfaces,result in notable variations in the surface energy flux patterns of the two *** this paper,data from TESEBS(Topographical Enhanced Surface Energy Balance System),remote sensing data from eight cloud-free scenarios,and observational data from nine stations are utilized to examine the fluctuations in the surface heat flux on both *** inclusion of MCD43A3 satellite data enhances the surface albedo,contributing to more accurate simulation *** model results are validated using observational *** RMSEs of the net radiation,ground heat,sensible heat,and latent heat flux are 40.73,17.09,33.26,and 30.91 w m^(−2),*** net radiation flux is greater on the south slope and exhibits a rapid decline from summer to *** to the influence of the monsoon,on the north slope,the maximum sensible heat flux occurs in the pre-monsoon period in summer and the maximum latent heat flux occurs during the *** south slope experiences the highest latent heat flux in *** dominant flux on the north slope is sensible heat,while it is latent heat on the south *** seasonal variations in the ground heat flux are more pronounced on the south slope than on the north *** in summer,the ground heat flux on the north slope surpasses that on the south slope.

关键词： Mount Qomolangma TESEBS model Remote sensing retrieval Surface heat fluxes

Polaron interfacial entropy as a route to high thermoelectric performance in DAE-doped PEDOT:PSS films

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National Science Review 2024年第3期11卷 259-270页

作者： Jiajia Zhang Caichao Ye Genw.ng wei Liang Guo Yuhang Cai Zhi Li Xinzhi wu Fangyi Sun Qikai Li Yupeng w.ng Huan Li yuchen Li Shuaihua w.ng wei Xu Xuefeng Guo wenqing Zhang weishu Liu Department of Materials Science and Engineering Southern University of Science and Technology Academy for Advanced Interdisciplinary Studies and Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences College of Chemistry and Molecular Engineering National Biomedical Imaging Centre Peking University Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology

Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies. However, the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly（3,4-ethylenedioxythiophene）-poly（4-styrenesulfonate）) thin film by using photochromic diarylethene（DAE） dopants coupled with UV-light modulation. with a 10-fold enhancement of the thermopower from 13.5 μV K-1to 135.4 μV K-1and almost unchanged electrical conductivity, the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28 μw m-1K-2from an original value of 6.78 μw m-1K-2. The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling. Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.

关键词： thermoelectric PEDOT: PSS interfacial occupied entropy resonant coupling UV-light modulation

超高热通量下非共沸不互溶混合物在多孔壁面微通道中的快速沸腾传热研究

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工程热物理学报 2024年第1期45卷 263-270页

作者：孙波包雨晨李骥中国科学院大学工程科学学院北京101408

本文提出了一种结构优化的具有大量亚微米成核点位的多孔壁面微通道两相换热器,并在流量50~150 L/h和热通量50~400 w/cm^(2)的工况下,对HFE-7100和HFE-7100/水的非共沸不互溶混合物的过冷流动沸腾特性进行了比较。结果表明,与HFE-7100相... 详细信息

本文提出了一种结构优化的具有大量亚微米成核点位的多孔壁面微通道两相换热器,并在流量50~150 L/h和热通量50~400 w/cm^(2)的工况下,对HFE-7100和HFE-7100/水的非共沸不互溶混合物的过冷流动沸腾特性进行了比较。结果表明,与HFE-7100相比,HFE-7100/水的混合液在多孔微通道中的沸腾换热效率更高,换热器的结温更低,并且沸腾所需的壁面过热度更小。此外,二元混合物组分的体积比对两相传热特性有着显著影响,不同工况对应着一个基于热阻–泵送功率最小化原则的最佳体积比。

关键词：微通道亚微米成核点非共沸不互溶超高热流密度

watt-level acousto-optically Q-switched Pr:YLF laser at 639 nm

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Chinese Optics Letters 2024年第1期22卷 76-83页

作者：薛喻宸张瑞松戴征东王中玉许惠英蔡志平 Department of Electronic Engineering School of Electronic Science and Engineering(National Model Microelectronics College)Xiamen UniversityXiamen 361005China

we present a study on a watt-level acousto-optically Q-switched Pr:YLF laser at three different repetition rates(10 kHz,20 kHz,and 50 kHz)for the first time,to the best of our *** corresponding average output powers and pulse widths were measured to be 1.14 w,1.2 w,and 1.32 w,and 40 ns,52 ns,and 80 ns,respectively.A maximum pulse energy of0.11 mJ was obtained,corresponding to a peak power of up to 2.8 kw at a repetition rate of 10 *** simulated dynamics of a fast Q-switched Pr:YLF laser is in agreement with the *** laser's ability to generate stable pulses with high peak power and short pulse width makes it highly desirable for various practical applications,such as laser machining and material processing.

关键词： red pulsed laser Pr:YLF diode pump acousto-optical Q switching

社会网络对中青年群体养老责任认同的影响研究——基于CGSS 2018年数据的检验

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人口学刊 2024年第1期46卷 81-95页

作者：陆杰华谷俞辰北京大学社会学系北京100871

从人口代际更迭的角度看,我国目前的中青年群体步入老年阶段后将面临重度老龄化和高龄老龄化并存的养老困境,亟须通过前瞻性制度规划和资源准备避免养老压力的代际叠加。由于认知是意愿形成和行为选择的前提与基础,中青年群体对养老责... 详细信息

从人口代际更迭的角度看,我国目前的中青年群体步入老年阶段后将面临重度老龄化和高龄老龄化并存的养老困境,亟须通过前瞻性制度规划和资源准备避免养老压力的代际叠加。由于认知是意愿形成和行为选择的前提与基础,中青年群体对养老责任归属的态度直接关系未来规模庞大的老年人口的养老方式,厘清其对养老责任主体的倾向与偏好可以在一定程度上预判未来潜在的养老需求,从而在养老资源总量不足、结构不均的情况下实现“有备而老”的积极老龄化目标。同时,我国是典型的人情关系社会,人们往往会借助血缘、亲缘、地缘等社会关系网络及相应资源降低养老活动的运行成本,尤其在家庭养老功能日趋萎缩的背景下,社会网络正在成为个体应对养老风险的重要支持力量,以互联网为代表的新型社交形式日益普及,也为保障老年福祉提供了新的可能。但目前学界相关研究对中青年群体和社会网络因素关注不足,仍然存在研究内容和研究维度上的缺位。基于此,本研究使用中国综合社会调查(CGSS)数据,分析我国中青年养老责任认同的变迁趋势,采用无序多分类Logistic回归模型探究社会网络各因素对中青年养老责任认同的作用机制,并以倾向得分匹配法(PSM)对结果进行稳健性检验。研究发现:在家庭赡养功能持续弱化的宏观背景下,传统的代际责任伦理在我国中青年群体中仍具有相当强的生命力,同时其对社会养老机制和自我养老机制的接受度逐渐提高。而社会关系网络能够发挥非正式保险的效用,对正式养老制度形成补充,进而降低社会风险对家庭的冲击。其中,以朋友交往为代表的强关系对子女养老发挥强有力的替代作用,弱关系网络主要具有补充功能,说明群体信任更强的强关系网络具备弱关系无法比拟的养老资源优势。而互联网作为社会网络中交往行为和互动关系的新表征形态,通过信息传递与政策普及,增强互助养老意识,社会信任则代表个体获取社会关系网络中信息与资源的能力,通过建构社会资本,弱化人们对子女和家庭养老的依赖。因此,以社会支持网络对现有养老实践作出补充,或将在有限养老资源的约束下缓解我国持续加剧的养老压力。

关键词：养老责任认同中青年群体养老责任主体社会网络

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三维氮掺杂分级多孔碳纳米片的制备及储锌性能

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高等学校化学学报 2024年第7期45卷 133-144页

作者：何军朱傲阳魏雨晨朱怡全蒋莉何孝军安徽工业大学化学与化工学院煤清洁转化与高值化利用安徽省重点实验室马鞍山243002 安徽工业大学继续教育学院马鞍山243002

以MgO@ZIF-8为双模板和辅助碳源,KHCO_(3)为活化剂,煤沥青(CTP)为碳源,制备了三维氮掺杂分级多孔碳纳米片(N-CNs),探究了KHCO_(3)与CTP的质量比对N-CNs的结构、化学组成和锌离子储存性能的影响.结果表明,当KHCO_(3)与CTP的质量比为3∶1... 详细信息

以MgO@ZIF-8为双模板和辅助碳源,KHCO_(3)为活化剂,煤沥青(CTP)为碳源,制备了三维氮掺杂分级多孔碳纳米片(N-CNs),探究了KHCO_(3)与CTP的质量比对N-CNs的结构、化学组成和锌离子储存性能的影响.结果表明,当KHCO_(3)与CTP的质量比为3∶1时,制备的样品(N-CN_(3))具有三维互连的碳纳米片结构、高比表面积(2360m^(2)/g)和吡咯氮含量.将N-CN_(3)作为锌离子混合电容器(ZHCs)正极时,其在2mol/LZnSO_(4)电解液中展现了出色的比容量(当电流密度为0.2A/g时,比容量为157.6mA·h/g)、高的能量密度(在176.1w/kg功率密度下能量密度为126.5 w·h/kg)和优异的循环稳定性(当电流密度为5 A/g时,经过20000次循环后容量仅衰减6.4%,库仑效率为99.6%).密度泛函理论计算结果证实,吡咯氮掺杂增加了电极材料对锌离子的吸附能,提高了N-CNs对锌离子的吸附容量.

关键词：锌离子混合电容器煤沥青多孔碳 MgO@ZIF-8 密度泛函理论计算