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学者姓名：施永乾
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There is a significant increase in the demand for lightweight and compressible electromagnetic interference (EMI) shielding materials in various fields. Though MXene aerogels hold immense potential as EMI shielding materials, several shortcomings including poor water resistance, low mechanical robustness, easy oxidation, and high cost limits of their wide application. This work reported a novel strategy involving the co-assembly of MXene and cellulose nanofibers (CNF) through directional freezing and freeze-drying, followed by the capsulation-concreting of a thin layer of flame-retardant polydimethylsiloxane (PDMS) onto the aerogel, to multi-hierarchically construct a series of high-performance CNF/MXene/PDMS composite aerogels. The lightweight CNF/MXene/PDMS/MPP-Zr@PDA composite aerogel achieved ultrahigh EMI shielding effectiveness of 96.8 dB (X-band) and utilization efficiency of 1713.27 dB g g-1. Furthermore, the PDMS coating effectively imparted excellent compressibility and durability to the 3D scaffold, resulting in a compressive strength of 17.01 kPa for the composite aerogel, representing 199.5% increase compared to CNF aerogel. Additionally, the composite aerogel exhibited outstanding flame-retardant properties (54.6% reduction in heat release rate), ultralow thermal conductivity of 0.0530 W m-1 K-1 and excellent hydrophobicity. Therefore, the durable and flame-retardant CNF/MXene/PDMS composite aerogels hold promising applications in EMI protection, thermal management, smart fire detection, and other specific fields.
Keyword ：
electromagnetic interference shielding electromagnetic interference shielding flame retardancy flame retardancy mechanical durability mechanical durability multihierarchical structure multihierarchical structure thermal insulation thermal insulation
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| GB/T 7714 | Shi, Yongqian , Zhu, Yanjun , Liu, Shan et al. Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity [J]. | SMALL , 2025 , 21 (22) . |
| MLA | Shi, Yongqian et al. "Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity" . | SMALL 21 . 22 (2025) . |
| APA | Shi, Yongqian , Zhu, Yanjun , Liu, Shan , Fu, Libi , Chen, Juntian , Liu, Jiawen et al. Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity . | SMALL , 2025 , 21 (22) . |
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With the continuous advancement of electronic devices, flexible thin films with both thermal management functions and excellent electromagnetic interference (EMI) shielding properties have received much attention. Hence, inspired by Janus, a CNF/MXene/ZnFe2O4 @PANI composite film with an asymmetric gradient alternating structure was successfully prepared by adjusting the filler content of the conductive and magnetic layers using a vacuum-assisted filtration method. Benefiting from the magnetic resonance and hysteresis loss of ZnFe2O4 @PANI, conductive loss and dipole polarization of MXene, as well as the exclusive "absorption-reflection-reabsorption" shielding feature in the alternating multilayered films, CM&CZFP-4 G film has superior EMI shielding performance, with an EMI SE of up to 45.75 dB and shielding effectiveness of 99.99 %. Surprisingly, the composite film maintains reliable EMI shielding properties even after prolonged erosion in harsh environments such as high/low temperatures, high humidity, acids and alkalis. Furthermore, the CM&CZFP-4 G responded quickly within about 50 s and reached a maximum steady-state temperature of 235.8 degrees C at an applied voltage of 9.0 V, indicating the obtained film acquired outstanding and controllable Joule heating performance. This result was attributed to the homogeneous dispersion of MXene to build up a conductive network and endow the CNF/MXene with high conductivity. Meanwhile, the fire resistance of CM&CZFP-4 G was significantly improved compared to pure CNF, which guaranteed fire safety during its application. Additionally, contributed by long fiber entanglement of CNF, extensive hydrogen-bonding interactions and multilayer structural design, the CM&CZFP-4 G film exhibits excellent mechanical characteristics, with the tensile strength and fracture strain of 27.74 MPa and 6.21 %, separately. This work offers a creative avenue to prepare multifunctional composite films with electromagnetic shielding and Joule heating for various application environments. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Alternating architecture Alternating architecture Asymmetric Asymmetric Electromagnetic interference shielding Electromagnetic interference shielding Joule heating Joule heating MXene MXene
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| GB/T 7714 | Yin, Lian , Zhang, Jiale , Luo, Jianjian et al. Janus-inspired alternating architecture CNF/MXene/ZnFe2 O4 @PANI composite films with outstanding electromagnetic interference shielding and Joule heating [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2025 , 223 : 275-286 . |
| MLA | Yin, Lian et al. "Janus-inspired alternating architecture CNF/MXene/ZnFe2 O4 @PANI composite films with outstanding electromagnetic interference shielding and Joule heating" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 223 (2025) : 275-286 . |
| APA | Yin, Lian , Zhang, Jiale , Luo, Jianjian , Shi, Yongqian , Yu, Bin , Zhang, Sheng et al. Janus-inspired alternating architecture CNF/MXene/ZnFe2 O4 @PANI composite films with outstanding electromagnetic interference shielding and Joule heating . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2025 , 223 , 275-286 . |
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为克服开展真实残障人员运动实验的挑战,设计并研制了一个能够模拟残障人员和健全人员组成的异质人群运动教学实验平台.结合文献调研、可控实验、图像处理等方法,设计了通道中残障人员和健全人员组成的异质人群单向运动实验方案,模拟真实的异质人群运动过程.基于理论分析,从人员运动轨迹、典型行为特征、速度、密度、流量等角度分析异质人群的基本运动规律,结果符合经验结论,验证了该平台模拟异质人群运动的可行性和合理性.该实验平台可为交通安全、安全管理等领域的实验研究与教学创新提供参考.
Keyword ：
图像处理 图像处理 实验平台 实验平台 异质人群 异质人群 残障人员 残障人员 运动特征 运动特征
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| GB/T 7714 | 傅丽碧 , 刘宇星 , 施永乾 . 模拟残障人员和健全人员组成的异质人群运动教学实验平台设计 [J]. | 实验技术与管理 , 2025 , 42 (2) : 52-58 . |
| MLA | 傅丽碧 et al. "模拟残障人员和健全人员组成的异质人群运动教学实验平台设计" . | 实验技术与管理 42 . 2 (2025) : 52-58 . |
| APA | 傅丽碧 , 刘宇星 , 施永乾 . 模拟残障人员和健全人员组成的异质人群运动教学实验平台设计 . | 实验技术与管理 , 2025 , 42 (2) , 52-58 . |
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There is a high proportion of social groups in crowds. The influence of social groups on crowd mobility is particularly evident in emergency situations and in confined movement environments. However, studies on the characteristics of social group movement through a bottleneck with different widths are limited. Therefore, the computation and simulation are performed in a corridor with a bottleneck involving individuals and three types of groups (namely two-person, three-person and four-person groups) using a modified multi-grid model. The original multigrid model is modified by introducing interactions between pedestrians, avoidance behavior and group behavior, and validated by data from a controlled experiment. It is found that the group configuration can be adjusted to the changing scenarios during the passing movement. The movement efficiency and level of walking comfort for pedestrians are significantly improved in wider bottlenecks. Passing efficiency is evidently increased and congestion is reduced, when social groups occupy a large proportion of the crowd in a narrow bottleneck. These numerical findings may provide new insights for analyzing nonlinear pedestrian social group dynamics.
Keyword ：
Bottlenecks Bottlenecks Group behavior Group behavior Pedestrian dynamics Pedestrian dynamics Simulation Simulation The multi-grid model The multi-grid model
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| GB/T 7714 | He, Yangjian , Shi, Qingxin , Fu, Libi et al. Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck [J]. | SIMULATION MODELLING PRACTICE AND THEORY , 2025 , 139 . |
| MLA | He, Yangjian et al. "Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck" . | SIMULATION MODELLING PRACTICE AND THEORY 139 (2025) . |
| APA | He, Yangjian , Shi, Qingxin , Fu, Libi , Chen, Qiyi , Shen, Chenxin , Zhang, Yu et al. Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck . | SIMULATION MODELLING PRACTICE AND THEORY , 2025 , 139 . |
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Epoxy resins (EP) is classic thermosetting material, but its flammability severely limits its usage. In this paper, a novel flame retardant (FePor@PZS) was synthesized by growing polyphosphazene (PZS) in situ onto the surface of iron porphyrin organic frameworks (FePor). Attributed to the synergistic flame retardant system of nitrogen, phosphorus and iron elements, FePor@PZS endowed excellent fire safety property to EP. Upon incorporating 2 wt% FePor@PZS, EP/FePor@PZS got an LOI value of 27.3%, achieving the V-1 level in the test of UL-94. Besides, the peak rate of heat release, release of total heat, peak rate of smoke production, production of total smoke, peak rate of CO2 production and peak rate of CO production of EP/FePor@PZS were decreased by 31.8%, 21.5%, 17.5%, 22.3%, 34.8% and 73.5%, respectively, and the quantity of residual carbon increased from 9.69% to 27.86%, compared with neat EP. FePor could break off to form a single pyrrole ring to promote the generation of the early carbon layers. Additionally, the Fe element in FePor and the P element in PZS played a role of catalytic carbonization. Meanwhile, PZS could decompose into non-combustible gases, and produce PO and HPO radicals to terminate the EP chain-opening reaction. This research gives a novel approach for the application of porphyrin derivatives in flame retardant composites. (c) 2024 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Keyword ：
Epoxy resins Epoxy resins Fire safety Fire safety Multi-element synergistic Multi-element synergistic Porphyrin organic frameworks Porphyrin organic frameworks
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| GB/T 7714 | Zhang, Jiale , Yin, Lian , Luo, Jianjian et al. Multi-element synergistic effect based on functionalized porphyrin organic frameworks: Towards for promoting fire safety of epoxy [J]. | ADVANCED POWDER TECHNOLOGY , 2025 , 36 (1) . |
| MLA | Zhang, Jiale et al. "Multi-element synergistic effect based on functionalized porphyrin organic frameworks: Towards for promoting fire safety of epoxy" . | ADVANCED POWDER TECHNOLOGY 36 . 1 (2025) . |
| APA | Zhang, Jiale , Yin, Lian , Luo, Jianjian , Zhou, Keqing , Shi, Yongqian , Yu, Bin et al. Multi-element synergistic effect based on functionalized porphyrin organic frameworks: Towards for promoting fire safety of epoxy . | ADVANCED POWDER TECHNOLOGY , 2025 , 36 (1) . |
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Heterointerface engineering has drawn considerable interest in tuning interfacial polarization and promoting impedance matching. Therefore, it has become a key strategy for optimizing electromagnetic wave (EMW) absorption. This comprehensive review primarily focused on the EMW absorbing strategies of polymer-based materials, emphasizing the critical developments of heterointerface engineering. A possible EMW absorbing mechanism of polymer-based materials was proposed, emphasizing the synergism of multi-components, microstructure design, and heterointerface engineering. Key innovations in structural design such as porous structure, multilayered structure, and segregated structure are explored, highlighting their contributions to enhancing EMW absorption. Also, the review highlights the latest research progress of advanced conductive polymer-based and insulating polymer-based materials with desirable EMW absorption performance; their fabrication methods, structures, properties, and EMW absorption mechanisms were elucidated in detail. Key challenges on polymer-based EMW absorbing materials are presented followed by some future perspectives.
Keyword ：
component component electromagnetic wave absorption electromagnetic wave absorption Heterointerface engineering Heterointerface engineering polymer-based polymer-based structure design structure design
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| GB/T 7714 | Liu, Shan , Zhou, Dengfeng , Huang, Fang et al. Heterointerface engineering of polymer-based electromagnetic wave absorbing materials [J]. | SOFT SCIENCE , 2025 , 5 (1) . |
| MLA | Liu, Shan et al. "Heterointerface engineering of polymer-based electromagnetic wave absorbing materials" . | SOFT SCIENCE 5 . 1 (2025) . |
| APA | Liu, Shan , Zhou, Dengfeng , Huang, Fang , He, Min , Qin, Shuhao , Shi, Yongqian et al. Heterointerface engineering of polymer-based electromagnetic wave absorbing materials . | SOFT SCIENCE , 2025 , 5 (1) . |
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In extreme environments, the simultaneous presence of mechanical impact and fire hazards poses significant challenges for single flexible polyurethane foam (FPUF) protective materials. To address these limitations, we developed an innovative multilayer coating structure for FPUF using a simple dip-drying method. This structure comprises a polydopamine (PDA) base layer, an intermediate layer containing ammonium polyphosphate (APP), carboxymethyl chitosan (CMC), and halloysite nanotubes (HNT), and a top layer of polydimethylsiloxane (PDMS). The multilayer coating significantly enhanced the cushioning and flame-retardant properties of FPUF. At a coating loading of 35 wt.%, the FPUF@PDA/A-C-H/PDMS exhibited a compressive strength 3.52 times higher than pure FPUF, with only a 10.2 % decrease after 100 compression cycles. The composite effectively dissipated 95.7 % of an impact energy of 1.22 J, achieving a 97.1 % impact force dissipation rate and significantly extending cushioning duration. The FPUF@PDA/A-C-H/PDMS demonstrated self-extinguishing properties after 10 s of exposure to a butane flame, maintaining structural integrity. Moreover, its peak heat release rate was reduced by 68.8 %. The multilayer coating also improved hydrophobicity and thermal insulation. This multifunctional foam composite shows great potential for enhancing the performances of FPUF in hazardous environments, offering robust protection in extreme conditions. © 2025 Elsevier Ltd
Keyword ：
Composite coatings Composite coatings Rigid foamed plastics Rigid foamed plastics Thermal barrier coatings Thermal barrier coatings Thermal insulation Thermal insulation
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| GB/T 7714 | Liu, Yan , Zhu, Yanjun , Chen, Jie et al. Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam [J]. | Polymer Degradation and Stability , 2025 , 239 . |
| MLA | Liu, Yan et al. "Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam" . | Polymer Degradation and Stability 239 (2025) . |
| APA | Liu, Yan , Zhu, Yanjun , Chen, Jie , Shi, Yongqian , Zhang, Yijie , Fu, Libi et al. Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam . | Polymer Degradation and Stability , 2025 , 239 . |
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In today's digital era, electromagnetic radiation pollution and fire hazard stand as a dual-edged sword, not only diminishing the efficacy of sophisticated electronic devices but also threatening human health. As a result, the pursuit of advanced electromagnetic shielding materials with high flame retardancy has ascended to the forefront of research priorities, underscoring their crucial role in mitigating these risks. In this study, pyrrole polymerization was employed to obtain a modified PPy-MXene, which was used to construct flame retardant modified MXene aerogel composites by the 'Concreting' method. It was found that peak heat release rate, the total heat release, peak CO₂ production rate, peak smoke production rate and total smoke release of the C1M2MTFRs were reduced by 67.7 %, 46.7 %, 71.4 %, 71.7 % and 77.3 %, respectively. Furthermore, the average electromagnetic interference shielding effectiveness of C1M2MTFRs in the X-band and K-band reached 67.3 dB and 91.4 dB, respectively. It was noted that CMMTFRs had the ultra-low reflectivity (as low as 0.14). Additionally, the mechanical durability and strength of the aerogel composites were obviously enhanced, with compressive stress increased by a factor of 3.2, in comparison with that of the CNF aerogel. © 2025 Elsevier B.V.
Keyword ：
Radar shielding Radar shielding
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| GB/T 7714 | Zhang, Wei , Wang, Hengrui , Ji, Siyi et al. Mechanically durable and flame retardant CNF/PPy-MXene aerogel composites toward superior electromagnetic shielding with ultra-low reflectivity [J]. | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 723 . |
| MLA | Zhang, Wei et al. "Mechanically durable and flame retardant CNF/PPy-MXene aerogel composites toward superior electromagnetic shielding with ultra-low reflectivity" . | Colloids and Surfaces A: Physicochemical and Engineering Aspects 723 (2025) . |
| APA | Zhang, Wei , Wang, Hengrui , Ji, Siyi , Shi, Yongqian , Gao, Jiefeng , Tang, Long-Cheng et al. Mechanically durable and flame retardant CNF/PPy-MXene aerogel composites toward superior electromagnetic shielding with ultra-low reflectivity . | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 723 . |
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Rapid and safe implementation of viscous crude oil cleanup is still a daunting challenge. Superhydrophobic materials are outstanding candidates for handling solvent spills, but are limited to recovering low viscosity oil and organic solvents. Hence, a polyurethane foam (PMRP-PU) integrating superelasticity, dual solar-responsive and fire resistance was fabricated by blending MXene and reduced graphene oxide (RGO) via self-foaming method. The surface temperature of the PMRP-PU reached 105 degrees C after simulated sunlight irradiation for 600 s. PMRP-PU had outstanding adsorption performance for low-viscosity oil and organic solvent (similar to 70.1 g/g) at room temperature, and the adsorption capacity of high -viscosity oil was also increased by 202.1 % compared with pure PU. Additionally, the adsorption capacity of PMRP-PU-3 remained at 92.7 % of the original level after 20 cycles of experiments. Excellent acid and alkali resistance and high temperature stability also greatly improved the environmental adaptability of the foam. Contrary to the flammability of pure PU, the peak heat release rate and total heat release of PMRP-PU-3 were decreased by 22.6 % and 25.2 %, respectively, and the melt dripping phenomenon disappeared during burning, exhibiting excellent fire safety. Briefly, this polyurethane foam can be repeatedly used for oil spill cleaning, and has a broad development prospect in the field of oil -water separation.
Keyword ：
Adsorption capacity Adsorption capacity Flame retardancy Flame retardancy High-viscosity oil High-viscosity oil Polyurethane foam Polyurethane foam Solar-responsive Solar-responsive
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| GB/T 7714 | Yin, Lian , Zhou, Mengqing , Shi, Yongqian et al. Construction of superhydrophobic flexible polyurethane with dual nano-enhancement effect for solar-assisted high-viscosity oil cleanup and oil-water separation [J]. | APPLIED SURFACE SCIENCE , 2024 , 660 . |
| MLA | Yin, Lian et al. "Construction of superhydrophobic flexible polyurethane with dual nano-enhancement effect for solar-assisted high-viscosity oil cleanup and oil-water separation" . | APPLIED SURFACE SCIENCE 660 (2024) . |
| APA | Yin, Lian , Zhou, Mengqing , Shi, Yongqian , Zhou, Keqing . Construction of superhydrophobic flexible polyurethane with dual nano-enhancement effect for solar-assisted high-viscosity oil cleanup and oil-water separation . | APPLIED SURFACE SCIENCE , 2024 , 660 . |
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Recently, solar-driven interfacial evaporation (SDIE) has been developed quickly for low-cost and sustainable seawater desalination, but addressing the conflict between a high evaporation rate and salt rejection during SDIE is still challenging. Here, a spatial confinement strategy is proposed to prepare the gel composite solar evaporator (SCE) by loading one thin hydrogel layer onto the skeleton of a carbon aerogel. The SCE retains the hierarchically porous structure of carbon aerogels with an optimized water supply induced by dual-driven forces (capillary effects and osmotic pressure) and takes advantage of both aerogels and hydrogels, which can gain energy from air and reduce water enthalpy. The SCE has a high evaporation rate (up to 4.23 kg m-2 h-1 under one sun) and excellent salt rejection performance and can maintain structural integrity after long-term evaporation even at high salinities. The SDIE behavior, including heat distribution, water transport, and salt ion distribution, is investigated by combining theoretical simulations and experimental results. This work provides new inspiration and a theoretical basis for the development of high-performance interfacial evaporators. The spatially confined hydrogel-modified interfacial evaporator (SCE) is prepared in this study. Dual-driven forces for water transportation of SCE including capillary effect and osmotic pressure ensure sufficient water supply for continuous evaporation up to 4.23 kg m-2 h-1 under one sun and excellent salt rejection performance that it can work in 20 wt.% saltwater stably for the long term. image
Keyword ：
carbon aerogel carbon aerogel hydrogel hydrogel interfacial evaporation interfacial evaporation solar steam generation solar steam generation
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| GB/T 7714 | Yan, Jun , Cui, Tao , Su, Qin et al. Spatial Confinement Engineered Gel Composite Evaporators for Efficient Solar Steam Generation [J]. | ADVANCED SCIENCE , 2024 , 11 (41) . |
| MLA | Yan, Jun et al. "Spatial Confinement Engineered Gel Composite Evaporators for Efficient Solar Steam Generation" . | ADVANCED SCIENCE 11 . 41 (2024) . |
| APA | Yan, Jun , Cui, Tao , Su, Qin , Wu, Haidi , Xiao, Wei , Ye, Liping et al. Spatial Confinement Engineered Gel Composite Evaporators for Efficient Solar Steam Generation . | ADVANCED SCIENCE , 2024 , 11 (41) . |
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