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Thermal conductivity of micro/nano-porous polymers: Prediction models and applications

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Frontiers of physics 2022年第2期17卷 135-153页

作者： Haiyan Yu Haochun Zhang Jinchuan Zhao Jing Liu Xinlin Xia xiaohu wu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Microcellular Plastics Manufacturing Laboratory(MPML) Department of Mechanical&Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoM5S 3G8OntarioCanada Cellular Polymer Science&Technology Laboratory School of Materials Science&EngineeringShandong UniversityJinan 250061China Shandong Institute of Advanced Technology Jinan 250100China

Micro/nano-porous polymeric material is considered a unique industrial material due to its extremelylow thermal conductivity, low density, and high surface area. Therefore, it is necessary to establishan accurate thermal conductivity prediction model suiting their applicable conditions and provide atheoretical basis for expanding their applications. In this work, the development of the calculationmodel of equivalent thermal conductivity of micro/nano-porous polymeric materials in recent yearsis summarized. Firstly, it reviews the process of establishing the overall equivalent thermal conductivity calculation model for micro/nanoporous polymers. Then, the predicted calculation models ofthermal conductivity are introduced separately according to the conductive and radiative thermalconductivity models. In addition, the thermal conduction part is divided into the gaseous thermalconductivity model, solid thermal conductivity model and gas-solid coupling model. Finally, it isconcluded that, compared with other porous materials, there are few studies on heat transfer of micro/nanoporous polymers, especially on the particular heat transfer mechanisms such as scale effectsat the micro/nanoscale. In particular, the following aspects of porous polymers still need to be furtherstudied: micro scaled thermal radiation, heat transfer characteristics of particular morphologies at thenanoscales, heat transfer mechanism and impact factors of micro/nanoporous polymers. Such studieswould provide a more accurate prediction of thermal conductivity and a broader application in energyconversion and storage systems.

关键词： thermal conductivity micro/nanoscale thermal radiation micro/nanoscale thermal conduction porous polymers heat transfer properties

Enhanced near-field radiative heat transfer between core-shell nanoparticles through surface modes hybridization

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Fundamental Research 2024年第5期4卷 1092-1099页

作者： Yang Hu Haotuo Liu Bing Yang Kezhang Shi Mauro Antezza xiaohu wu Yasong Sun Shandong Institute of Advanced Technology Jinan 250100China Basic Research Center School of Power and EnergyNorthwestern Polytechnical UniversityXi'an 710072China Center of Computational Physics and Energy Science Yangtze River Delta Research Institute of NPUNorthwestern Polytechnical UniversityTaicang 215400China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Centre for Advanced Laser Manufacturing(CALM) School of Mechanical EngineeringShandong University of TechnologyZibo 255000China Centre for Optical and Electromagnetic Research National Engineering Research Center for Optical InstrumentsZhejiang UniversityHangzhou 310058China Laboratoire Charles Coulomb(L2C)UMR 5221 CNRS-Universitéde Montpellier Montpellier F-34095France Institut Universitaire de France 1 rue DescartesParisCedex 05 F-75231France

Core-shell nanoparticles(CSNPs)are widely used in energy harvesting,conversion,and thermal management due to the excellent physical properties of different *** of the synergistic interaction between the core and the shell,the thermal radiative properties are expected to be further *** this work,we achieve near-field radiative heat transfer(NFRHT)enhancement between SiC@Drude *** results show that the total heat flux between NPs is 1.47 times and 9.98 times higher than homogeneous SiC and Drude NPs at the same radius when the core volume fraction is *** modes hybridization arising from the interfaces of the shell-core and shell-air contributes to the improved thermal *** effect of shift frequency on the NFRHT between SiC@Drude CSNPs is studied,showing that the enhancement ratio of NFRHT between CSNPs can reach 4.34 at a shift frequency of 1×10^(14) rad/s,which is 38.34 times higher than the previous *** study demonstrates that surface modes hybridization in CSNPs can significantly improve NFRHT and open a novel path for high-efficiency energy transport at the nanoscale.

关键词： Near-field radiative heat transfer Core-shell nanoparticle Homogeneous nanoparticle Surface modes hybridization Shift frequency

Actively tuning anisotropic light-matter interaction in biaxial hyperbolic materialα-MoO_(3) using phase change material VO_(2) and graphene

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Chinese Physics B 2024年第4期33卷 631-638页

作者：周昆胡杨吴必园仲晓星吴小虎 School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Gas and Fire Control for Coal Mines China University of Mining and TechnologyXuzhou 221116China Shandong Institute of Advanced Technology Jinan 250100China School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

Anisotropic hyperbolic phonon polaritons(PhPs)in natural biaxial hyperbolic materialα-MoO_(3) has opened up new avenues for mid-infrared nanophotonics,while active tunability ofα-MoO_(3) PhPs is still an urgent problem necessarily to be *** this study,we present a theoretical demonstration of actively tuningα-MoO_(3) PhPs using phase change material VO_(2) and *** is observed thatα-MoO_(3) PhPs are greatly dependent on the propagation plane angle of *** insulator-to-metal phase transition of VO_(2) has a significant effect on the hybridization PhPs of theα-MoO_(3)/VO_(2) structure and allows to obtain actively tunableα-MoO_(3) PhPs,which is especially obvious when the propagation plane angle of PhPs is ***,when graphene surface plasmon sources are placed at the top or bottom ofα-MoO_(3) inα-MoO_(3)/VO_(2)structure,tunable coupled hyperbolic plasmon-phonon polaritons inside its Reststrahlen bands(RB s)and surface plasmonphonon polaritons outside its RBs can be *** addition,the above-mentionedα-MoO_(3)-based structures also lead to actively tunable anisotropic spontaneous emission(SE)*** study may be beneficial for realization of active tunability of both PhPs and SE ofα-MoO_(3),and facilitate a deeper understanding of the mechanisms of anisotropic light-matter interaction inα-MoO_(3) using functional materials.

关键词： light-matter interaction hyperbolic material phase change material graphene

Endothelial PDGF-BB/PDGFR-βsignaling promotes osteoarthritis by enhancing angiogenesis-dependent abnormal subchondral bone formation

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Bone Research 2022年第4期10卷 852-866页

作者： Zhuang Cui Hangtian wu Ye Xiao Ting Xu Junjie Jia Hancheng Lin Rongmin Lin Kun Chen Yihuang Lin Kaiqun Li xiaohu wu Changjun Li Bin Yu Division of Orthopaedics and Traumatology Department of OrthopaedicsNanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Guangdong Provincial Key Laboratory of Bone and Cartilage Regeneration Medicine Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Department of Endocrinology Endocrinology Research CenterXiangya Hospital of Central South UniversityChangshaHunan 410008China National Clinical Research Center for Geriatric Disorders Xiangya HospitalChangshaHunan 410008China Department of Sleep Medicine Center Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515China

The mechanisms that coordinate the shift from joint homeostasis to osteoarthritis(OA)remain *** pharmacological intervention can currently prevent the progression of *** evidence has shown that subchondral bone deterioration is a primary trigger for overlying cartilage *** previously found that H-type vessels modulate aberrant subchondral bone formation during the pathogenesis of ***,the mechanism responsible for the elevation of H-type vessels in OA is still ***,we found that PDGFR-βexpression,predominantly in the CD31^(hi)Emcn^(hi) endothelium,was substantially elevated in subchondral bones from OA patients and rodent OA models.A mouse model of OA with deletion of PDGFR-βin endothelial cells(ECs)exhibited fewer H-type vessels,ameliorated subchondral bone deterioration and alleviated overlying cartilage *** PDGFR-βpromotes angiogenesis through the formation of the PDGFR-β/talin1/FAK ***,endothelium-specific inhibition of PDGFR-βby local injection of AAV9 in subchondral bone effectively attenuated the pathogenesis of OA compared with that of the vehicle-treated *** on the results from this study,targeting PDGFR-βis a novel and promising approach for the prevention or early treatment of OA.

关键词： degeneration osteoarthritis angiogenesis

The coral-inspired steam evaporator for efficient solar desalination via porous and thermal insulation bionic design

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SmartMat 2023年第6期4卷 72-83页

作者： He Zhang Xiaoke Li Size Zheng Jin Wen Jiaying Zhou Rui Yang Wenmei Luo Liu Yang xiaohu wu College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengduChina Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjingChina Shandong Institute of Advanced Technology JinanChina

The solar-driven interfacial evaporation(SIE)technology shows great prospects in seawater desalination and sewage treatment,but it is unable to obtain highly efficient and high-quality clean nontoxic water at low ***,a novel biodegradable hydrogel-based solar evaporator(BBH-L)with a bionic coral structure taking Chinese ink as the solar absorber was *** evaporator consists of chitosan/polyvinyl alcohol hydrogel and a loofah *** average evaporation rate and efficiency of BBH-L reach 4.37 kg/(m^(2)·h)and 98.2%,respectively,under one sun illumination(1 kW/m^(2)),which are attributed to its excellent thermal localization and water transporting ***,high salt resistance enables BBH-L to achieve efficient desalination and purification of other unconventional *** metal ions in seawater can be effectively removed by chelation and forming hydrogen bonds in *** study is anticipated to provide new possibilities to enhance evaporation performance and reduce the costs of water treatment systems.

关键词： desalination hydrogel-based solar evaporator solar-driven interfacial evaporation unconventional water

Near-Field Thermal Splitter Based on Magneto-Optical Nanoparticles

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Chinese Physics Letters 2023年第11期40卷 66-72页

作者：葛文宣胡杨高雷吴小虎 School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China School of Optical and Electronic Information Suzhou City UniversitySuzhou 215104China Jiangsu Key Laboratory of Thin Films Soochow UniversitySuzhou 215006China Shandong Institute of Advanced Technology Jinan 250100China School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

Based on the many-body radiative heat transfer theory,we investigate a thermal splitter based on three magneto-optical In Sb *** system comprises a source with adjustable parameters and two drains with fixed *** leveraging the temperature and magnetic field dependence of the permittivity of In Sb,the direction of heat flux in the system can be controlled by adjusting the magnetic field or temperature at the *** magnetic field control,the coupling between the separated modes,and the suppression of the zero-field mode induced by the magnetic field,are utilized to achieve a thermal splitting ratio within the modulation range of 0.15–***,temperature control results in a thermal splitting ratio ranging from 0.15 to 0.99,as a result of the suppression of the zero-field mode by the magnetic field and the blue shift effect of the zero-field mode frequency increasing with ***,the gap distance between nanoparticles does not significantly affect the splitting *** findings provide valuable theoretical guidance for utilizing magneto-optical nanoparticles as thermal splitters and lay the groundwork for implementing complex heat flux networks using In Sb for energy collection and heat transfer control.

关键词： splitting thermal system

考虑相态变化的凝析气藏压井液漏失机理与产能恢复

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石油勘探与开发 2017年第4期44卷 622-629页

作者：贾虎吴晓虎油气藏地质与开发工程国家重点实验室西南石油大学成都610500

以某凝析气井为例,结合油气藏工程和油气相态理论,根据凝析气藏特征建立了单井数值模型,考虑了岩石的毛管压力及毛管滞后现象,研究不同正压差下压井液漏失机理及其对产能恢复的影响。研究结果表明:当近井地带压力增加到凝析油气的临界... 详细信息

以某凝析气井为例,结合油气藏工程和油气相态理论,根据凝析气藏特征建立了单井数值模型,考虑了岩石的毛管压力及毛管滞后现象,研究不同正压差下压井液漏失机理及其对产能恢复的影响。研究结果表明:当近井地带压力增加到凝析油气的临界压力时,油、气、水三相流过渡为油、水两相流,气锁效应降低,水相相对渗透率增加,表现为压井液漏失速率大幅增加;压井液漏失量的增加会影响近井地带凝析油气的相态及储集空间流体分布,从而导致压井液恶性漏失。漏失量越大,再次开井生产时,压井液返排时间越长,返排率越低,凝析油、气恢复稳产所需时间越长。修井过程采取使用防漏型储集层保护液或降低液柱正压差(低密度压井液)的方法可有效避免恶性漏失,保障修井后的产能。

关键词：凝析气藏相态变化压井液数值模拟漏失机理产能恢复

Active tuning of anisotropic phonon polaritons in natural van der Waals crystals with negative permittivity substrates and its application in energy transport

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Opto-Electronic Science 2024年第6期3卷 1-19页

作者： Shuo Chen xiaohu wu Ceji Fu LTCS and Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China Shandong Institute of Advanced Technology Jinan 250100China

Phonon polaritons(PhPs)exhibit directional in-plane propagation and ultralow losses in van der Waals(vdW)crystals,offering new possibilities for controlling the flow of light at the ***,these PhPs,including their directional propagation,are inherently determined by the anisotropic crystal structure of the host *** in-plane anisotropic PhPs can be manipulated by twisting engineering,such as twisting individual vdW slabs,dynamically adjusting their propagation presents a significant *** limited application of the twisted bilayer structure in bare films further restricts its *** this study,we present a technique in which anisotropic PhPs supported by bare biaxial vdW slabs can be actively tuned by modifying their local dielectric ***,we predict that the iso-frequency contour of PhPs can be reoriented to enable propagation along forbidden directions when the crystal is placed on a substrate with a moderate negative ***,we systematically investigate the impact of polaritonic coupling on near-field radiative heat transfer(NFRHT)between heterostructures integrated with different substrates that have negative *** main findings reveal that through the analysis of dispersion contour and photon transmission coefficient,the excitation and reorientation of the fundamental mode facilitate increased photon tunneling,thereby enhancing heat transfer between ***,the annihilation of the fundamental mode hinders heat ***,we find the enhancement or suppression of radiative energy transport depends on the relative magnitude of the slab thickness and the vacuum gap ***,the effect of negative permittivity substrates on NFRHT along the[001]crystalline direction ofα-MoO3 is *** spectral band where the excited fundamental mode resulting from the negative permittivity substrates is shifted to the first Reststrahlen Band(RB 1)ofα-MoO_(3) and

关键词： anisotropic phonon polaritons forbidden direction substrate with a negative permittivity near-field energy transport

Near-field radiative heat transfer in hyperbolic materials

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International Journal of Extreme Manufacturing 2022年第3期4卷 26-47页

作者： Ruiyi Liu Chenglong Zhou Yong Zhang Zheng Cui xiaohu wu Hongliang Yi Institute for Advanced Technology Shandong UniversityJinan 250061People’s Republic of China Shandong Institute of Advanced Technology Jinan 250100People’s Republic of China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin 150001People’s Republic of China

In the post-Moore era, as the energy consumption of micro-nano electronic devices rapidly increases, near-field radiative heat transfer(NFRHT) with super-Planckian phenomena has gradually shown great potential for applications in efficient and ultrafast thermal modulation and energy conversion. Recently, hyperbolic materials, an important class of anisotropic materials with hyperbolic isofrequency contours, have been intensively investigated. As an exotic optical platform, hyperbolic materials bring tremendous new opportunities for NFRHT from theoretical advances to experimental designs. To date, there have been considerable achievements in NFRHT for hyperbolic materials, which range from the establishment of different unprecedented heat transport phenomena to various potential applications. This review concisely introduces the basic physics of NFRHT for hyperbolic materials, lays out the theoretical methods to address NFRHT for hyperbolic materials, and highlights unique behaviors as realized in different hyperbolic materials and the resulting applications. Finally, key challenges and opportunities of the NFRHT for hyperbolic materials in terms of fundamental physics, experimental validations, and potential applications are outlined and discussed.

关键词： near-field radiative heat transfer hyperbolic materials photon tunneling hyperbolic phonon polaritons