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Highly Aligned Graphene Aerogels for Multifunctional Composites

Nano-Micro Letters 2024年第6期16卷 276-342页

作者： Ying Wu Chao An Yaru Guo Yangyang Zong Naisheng Jiang Qingbin zheng zhong‑zhen yu Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004People’s Republic of China School of Science and Engineering The Chinese University of Hong KongShenzhenShenzhenGuangdong 518172People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Stemming from the unique in-plane honeycomb lattice structure and the sp^(2)hybridized carbon atoms bonded by exceptionally strong carbon–carbon bonds,graphene exhibits remarkable anisotropic electrical,mechanical,and thermal *** maximize the utilization of graphene’s in-plane properties,pre-constructed and aligned structures,such as oriented aerogels,films,and fibers,have been *** unique combination of aligned structure,high surface area,excellent electrical conductivity,mechanical stability,thermal conductivity,and porous nature of highly aligned graphene aerogels allows for tailored and enhanced performance in specific directions,enabling advancements in diverse *** review provides a comprehensive overview of recent advances in highly aligned graphene aerogels and their *** highlights the fabrication methods of aligned graphene aerogels and the optimization of alignment which can be estimated both qualitatively and *** oriented scaffolds endow graphene aerogels and their composites with anisotropic properties,showing enhanced electrical,mechanical,and thermal properties along the alignment at the sacrifice of the perpendicular *** review showcases remarkable properties and applications of aligned graphene aerogels and their composites,such as their suitability for electronics,environmental applications,thermal management,and energy *** and potential opportunities are proposed to offer new insights into prospects of this material.

关键词： Highly aligned graphene aerogels Quantitative characterization of alignment Multifunctional composites Anisotropic properties Multifunctional applications

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Direct ink writing of multifunctional gratings with gel-like MXene/norepinephrine ink for dynamic electromagnetic interference shielding and patterned Joule heating

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Nano Research 2024年第3期17卷 1585-1594页

作者： Pei-Zhu Jiang Zhiming Deng Peng Min Lvxuan Ye Cheng-Zhang Qi Hao-yu Zhao Ji Liu Hao-Bin Zhang zhong-zhen yu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China School of Chemistry CRANN and AMBERTrinity College DublinDublin D02PN40Ireland

Intelligent electromagnetic interference(EMI)shielding modulators with a wide tuning range and cyclic stability are urgently needed but their fabrication remains challenging.A gel-like MXene/norepinephrine ink is developed and multifunctional MXene gratings with wide EMI shielding effectiveness(SE)tuning range,superior reversibility,and high mechanical flexibility are constructed by direct ink writing approach for dynamic EMI shielding and patterned Joule heating *** modulable MXene/norepinephrine grating with a high conductivity of 3510 S·cm-1 can conveniently realize the seamless modulation of the EMI SE by adjusting the angle between the MXene grating filaments and the electric field of the incident electromagnetic waves,offering highly reversible switching between shielding“On”(28.0 dB)and“Off”(0.5 dB)***,due to the optimized integration of the MXene ink and the rationally designed pattern,a superior specific EMI SE of 95,688.2 dB·cm^(2)·g^(-1) is achieved in the“On”***,the MXene/norepinephrine ink can be used to fabricate many complex patterned gratings with superior stability,instant responsibility,and superb mechanical flexibility,exhibiting a unique patterned Joule heating *** writing of multifunctional gratings paves a means for developing intelligent EMI shielding materials,wearable electronic devices,and advanced thermal management materials.

关键词： MXene ink direct ink writing electromagnetic interference shielding multifunctional gratings Joule heating

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泄洪消力池消力墩消能特性数值模拟研究

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水电能源科学 2024年第5期42卷 144-148页

作者：陈柏雨钟振宇聂文豪蒋勤郝婕河海大学港口海岸与近海工程学院江苏南京210098 中国电建集团中南勘测设计研究院有限公司湖南长沙410014 中水珠江规划勘测设计有限公司广东广州510610

消力墩是常用的泄洪消力池消能结构物之一,对其消能效果与结构优化研究在枢纽结构设计中具有重要作用。为此,基于描述非恒定流运动的雷诺平均(RANS)方程和描述紊流运动的Realizableκ-ε湍流模型,采用VOF自由表面追踪方法,建立了模拟大... 详细信息

消力墩是常用的泄洪消力池消能结构物之一,对其消能效果与结构优化研究在枢纽结构设计中具有重要作用。为此,基于描述非恒定流运动的雷诺平均(RANS)方程和描述紊流运动的Realizableκ-ε湍流模型,采用VOF自由表面追踪方法,建立了模拟大自由表面变形流体运动的数值计算模型,对坝面泄洪引起的跌坎型消力池内复杂流体运动及消力墩的消能特性进行研究。首先,对不同坝面泄洪条件下消力池内水流运动进行模拟,通过将自由液面、水流流态及底板压强分布等的模拟结果与室内实测数据进行对比,验证了模型的模拟精度和可靠性;在此基础上,模拟分析了矩形、直角梯形和T形三种典型消力墩对消力池内水流流速、液面形态及湍动能分布的影响,探讨了长、宽、高相同、几何形状不同的消力墩的消能效果。结果表明,对水流能量的耗散作用,矩形消力墩优于直角梯形消力墩、直角梯形消力墩优于T形消力墩。

关键词：跌坎型消力池消力墩自由表面流 VOF法数值模型消能特性

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Efficient Preconstruction of Three‑Dimensional Graphene Networks for Thermally Conductive Polymer Composites

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Nano-Micro Letters 2022年第8期14卷 72-111页

作者： Hao‑yu Zhao Ming‑yuan yu Ji Liu Xiaofeng Li Peng Min zhong‑zhen yu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China School of Chemistry CRANN and AMBERTrinity College DublinDublinIreland

Electronic devices generate heat during operation and require efficient thermal management to extend the lifetime and prevent performance *** by its exceptional thermal conductivity,graphene is an ideal functional filler for fabricating thermally conductive polymer composites to provide efficient thermal *** studies have been focusing on constructing graphene networks in polymer composites to achieve high thermal *** with conventional composite fabrications by directly mixing graphene with polymers,preconstruction of three-dimensional graphene networks followed by backfilling polymers represents a promising way to produce composites with higher performances,enabling high manufacturing flexibility and *** this review,we first summarize the factors that affect thermal conductivity of graphene composites and strategies for fabricating highly thermally conductive graphene/polymer ***,we give the reasoning behind using preconstructed three-dimensional graphene networks for fabricating thermally conductive polymer composites and highlight their potential ***,our insight into the existing bottlenecks and opportunities is provided for developing preconstructed porous architectures of graphene and their thermally conductive composites.

关键词： Graphene networks Thermal conductivity Thermal interface materials Phase change composites Anisotropic aerogels

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Subarachnoid disseminative hemangiopericytoma of the spinal cord

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Chinese Medical Journal 2010年第11期123卷 1485-1488页

作者： LIN Guo-zhong WANG zhen-yu LI zhen-dong zhong Yan-feng WANG Lei-ming Department of Neurosurgery Peking University Third HospitalPeking University Beijing 100191 China

Hemangiopericytomas （HPCs） originating from central nervous system were increasingly reportedrecently. Intravertebral HPCs are preclomlnanuy eplaural. Primary intradural HPCs of spinal cord are rare. Little subarach... 详细信息

关键词： hemangiopericytoma cervical spinal cord subarachnoid disseminateion

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Constructing central hollow cylindrical reduced graphene oxide foams with vertically and radially orientated porous channels for highly efficient solar-driven water evaporation and purification

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Nano Research 2023年第5期16卷 6343-6352页

作者： Changjun Li Wei Li Hao-yu Zhao Xin-yue Feng Xiaofeng Li zhong-zhen yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Although solar steam generation is an eco-friendly approach for desalinating seawater and purifying wastewater,there are still issues on how to improve the efficiency of solar energy utilization and accelerate the water and heat transport inside the solardriven water ***,we design a central hollow cylindrical reduced graphene oxide(RGO)foam with vertically and radially orientated channels as a solar steam generation device for efficient water evaporation and *** vertically aligned porous channels accelerate upward transport of water to the top evaporation surface,while the radially aligned porous channels facilitate water transport and heat transfer along the radial directions for fully utilizing the heat accumulated inside the central cylindrical hole of the *** central hole of the foam plays a highly positive role in accumulating more heat for accelerating the water evaporation,the newly generated inner sidewall resulted from the central hole can gain extra thermal energy from surrounding environment in the same way as the outer sidewall of the foam due to the surface cooling effect of the water *** a result,the vertically and radially aligned RGO foam evaporator with central hollow cylinder achieves a high solar steam generation rate of 2.32 kg·m^(−2)·h^(−1)with an exceptional energy conversion efficiency of 120.9%under 1-sun irradiation,superior to the vertically aligned RGO foam without the central hole(1.83 kg·m^(−2)·h^(−1),96.9%)because of the enhanced water and heat transfer inside the porous channels,the efficient utilization of environmental energy.

关键词： hollow cylindrical foams reduced graphene oxide solar steam generation water evaporation rate seawater desalination

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Recent progress in self-propelled particles

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Journal of Hydrodynamics 2024年第1期36卷 61-77页

作者： zhen-yu Ouyang Jian-zhong Lin Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo315201China Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou310027China

Self-propelled particles are commonly found in a large number of planktonic organisms such as bacteria,fungi,and algae in nature,and researchers have taken a long interest in exploring their swimming mechanisms for more than a *** in the past 20 years,with the development of computational fluid dynamics and flow display technology,as well as the need for the design of synthetic self-propelled particles and micro-swimming devices,self-propelled particles have become the forefront and hotspot of current research in the field of fluid *** paper first introduces the swimming characteristics of common self-propelled particles,leading to a classic“squirmer”type self-propelled particle *** this basis,a systematic introduction and summary of the theoretical and numerical simulation research of“squirmer”will be ***,the main challenges and opportunities faced by the current research will be summarized.

关键词： Self-propelled particles multiphase flow hydrodynamic interaction

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Strong and conductive reduced graphene oxide-MXene porous films for efficient electromagnetic interference shielding

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Nano Research 2022年第6期15卷 4916-4924页

作者： yu Zhang Ming-Ke Xu zhenguo Wang Tianyu Zhao Liu-Xin Liu Hao-Bin Zhang zhong-zhen yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029China

Lightweight,flexible,and electrically conductive porous films are promising for efficient electromagnetic interference(EMI)***,the mechanical and electrical properties of porous films are far from ***,we fabricate mechanically flexible and electrically conductive reduced graphene oxide(rGO)-Ti_(3)C_(2)T_(x)MXene(rG-M)porous films with optimized continuous cellular morphology by a controlled hydrazine foaming *** presence of MXene prevents excessive expansion of the rG-M film,improves the electron conduction paths,and enhances the mechanical *** resultant rG-M porous film has superior mechanical and electric performances compared to its rGO counterpart,giving one of the highest tensile strengths(24.5 MPa)among the porous films,a high electrical conductivity of 74.4 S·cm^(−1),and an excellent broadband EMI shielding from 8 to 26.5 GHz.A high EMI shielding effectiveness of 52.6 dB is achieved for the porous film by adjusting its thickness and treatment procedure,providing a feasible fabrication route for lightweight and high-performance EMI shielding materials.

关键词： graphene MXene electromagnetic interference shielding porous films electrical conductivity

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3D Lamellar-Structured Graphene Aerogels for Thermal Interface Composites with High Through-Plane Thermal Conductivity and Fracture Toughness

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Nano-Micro Letters 2021年第2期13卷 13-27页

作者： Pengfei Liu Xiaofeng Li Peng Min Xiyuan Chang Chao Shu yun Ding zhong-zhen yu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although thermally conductive graphene sheets are efficient in enhancing in-plane thermal conductivities of polymers,the resulting nanocomposites usually exhibit low through-plane thermal conductivities,limiting their application as thermal interface ***,lamellarstructured polyamic acid salt/graphene oxide(PAAS/GO)hybrid aerogels are constructed by bidirectional freezing of PAAS/GO suspension followed by ***,PAAS monomers are polymerized to polyimide(PI),while GO is converted to thermally reduced graphene oxide(RGO)during thermal annealing at 300℃.Final graphitization at 2800℃ converts PI to graphitized carbon with the inductive effect of RGO,and simultaneously,RGO is thermally reduced and healed to high-quality ***,lamellar-structured graphene aerogels with superior through-plane thermal conduction capacity are fabricated for the first time,and its superior through-plane thermal conduction capacity results from its vertically aligned and closely stacked high-quality graphene *** vacuum-assisted impregnation with epoxy,the resultant epoxy composite with 2.30 vol% of graphene exhibits an outstanding through-plane thermal conductivity of as high as 20.0 W m^−1 K^−1,100 times of that of epoxy,with a record-high specific thermal conductivity enhancement of 4310%.Furthermore,the lamellar-structured graphene aerogel endows epoxy with a high fracture toughness,~1.71 times of that of epoxy.

关键词： Anisotropic aerogels Graphene Thermal conductivity Epoxy composites Fracture toughness

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聚α-烯烃全合成基础润滑油的研究进展

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广州化工 2024年第12期52卷 19-22页

作者：王圆广刘振宇陈子华钟震宇李禄建中国石油化工股份有限公司茂名分公司研究院广东茂名525000 广东省先进绿色润滑材料企业重点实验室广东茂名525000

聚α-烯烃(PAO)是一类广泛应用的合成基础润滑油,具有相对较高的粘度指数、在低温下性能相对更优、热氧化安定性相对更好、低挥发性、剪切安定性好等优点。随着高尖端产业的迅猛发展,比如航空航天和新能源等,以及节约能源和保护环境的... 详细信息

聚α-烯烃(PAO)是一类广泛应用的合成基础润滑油,具有相对较高的粘度指数、在低温下性能相对更优、热氧化安定性相对更好、低挥发性、剪切安定性好等优点。随着高尖端产业的迅猛发展,比如航空航天和新能源等,以及节约能源和保护环境的条件逐渐高提升,对高品质的商业润滑油的需求增加,原本III类油等的原料和生产过程本身所受到的限制,这些产品的性能很难满足在某些极端苛刻条件下的润滑情况。但PAO拥有更优的化学性能,例如:粘温性能、低温流动性、氧化安定性、抗辐射等性能等。从而可以延长换油周期、减少排放、降低发动机磨损、且在极端温度下的良好流动性等,受到了越来越多的关注和使用。本文综述了PAO的合成方法,包括AlCl_(3)催化剂、BF_(3)催化剂、离子液体、Ziegler-Natta催化剂和茂金属催化剂等技术路线。

关键词：聚α-烯烃润滑油催化剂

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