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Two-dimensional materials： Emerging toolkit for construction of ultrathin high-efficiency microwave shield and absorber

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Frontiers of physics 2018年第4期13卷 53-91页

作者： mingjun hu Naibo Zhang Guangcun Shan Jiefeng Gao Jinzhang Liu Robert K. Y. Li School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Research and Development Center the 54th Research Institute Electronics Technology Group Corporation Beijing 100070 China School of Instrumentation Science and Opto-electronics Engineering Beihang University Beijing 100191 China School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 China Department of Materials Science and Engineering City University of Hong Kong Hong Kong China

Two-dimensional （2D） materials generally have unusual confined electro-strong interaction in a plane and can physical and chemical properties owing to the exhibit obvious anisotropy and a significant quantum-confinement effect, thus showing great promise in many fields. Some 2D materials, such as graphene and MXenes, have recently exhibited extraordinary electromagnetic-wave shielding and absorbing performance, which is attributed to their special electrical behavior, large specific surface area, and low mass density. Compared with traditional microwave attenuating materials, 2D materials have several obvious inherent advantages. First, similar to other nanomaterials, 2D materials have a very large specific surface area and can provide numerous interfaces for the enhanced interfacial polarization as well as the reflection and scattering of electromagnetic waves. Second, 2D materials have a particular 2D morphology with ultrasmall thickness, which is not only beneficial for the penetration and dissipation of electromagnetic waves through the 2D nanosheets, giving rise to multiple reflections and the dissipation of electromagnetic energy, but is also conducive to the design and fabrication of various well-defined structures, such as layer-by-layer assemblies, core-shell particles, and porous foam, for broadband attenuation of electromagnetic waves. Third, owing to their good processability, 2D materials can be integrated into various multifunctional composites for multimode attenuation of electromagnetic energy. In addition to behaving as microwave reflectors and absorbers, 2D materials can act as impedance regulators and provide structural support for good impedance matching and setup of the optimal structure. Numerous studies indicate that 2D materials are among the most promising microwave attenuation materials. In view of the rapid development and enormous advancement of 2D materials in shielding and absorbing electromagnetic wave, there is a strong need to summar

关键词： electromagnetic interference shielding microwave absorber graphene MXenes polymernanocomposites

Vertical-external-cavity surface-emitting lasers and quantum dot lasers

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Frontiers of Optoelectronics 2012年第2期5卷 157-170页

作者： Guangcun SHAN Xinghai ZHAO mingjun hu Chan-hung SHEIK WeihuANG State Key Laboratory of Functional Materials for Informatics Chinese Academy of SciencesShanghai 200050China Department of Physics and Materials Science City University of Hong KongHong KongChina Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621900China Institute of Advanced Materials Nanjing University of Posts and TelecommunicationsNanjing 210046China

The use of cavity to manipulate photon emission of quantum dots （QDs） has been opening unprecedented opportunities for realizing quantum functional nanophotonic devices and quantum information devices. In particular, in the field of semiconductor lasers, QDs were introduced as a superior alternative to quantum wells （QWs） to suppress the temperature dependence of the threshold current in vertical-external-cavity surfaceemitting lasers （VECSELs）. In this work, a review of properties and development of semiconductor VECSEL devices and QD laser devices is given. Based on the features of VECSEL devices, the main emphasis is put on the recent development of technological approach on semiconductor QD VECSELs. Then, from the viewpoint of both single QD nanolaser and cavity quantum electro- dynamics （QED）, a single-QD-cavity system resulting from the strong coupling of QD cavity is presented. In this review, we will cover both fundamental aspects and technological approaches of QD VECSEL devices. Lastly, the presented review here has provided deep insight into useful guideline for the development of QD VECSEL technology, future quantum functional nanophotonic devices and monolithic photonic integrated circuits （MPhlCs）.

关键词： vertical-external-cavity surface-emittinglasers (VECSELs) quantum dot (QD) QD laser quantumelectrodynamics (QED) cavity QED

Regulating intramolecular hydrogen bonds of p-phenylenediimidazole-based small-molecule compounds towards the enhanced lithium storage capacity

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Journal of Energy Chemistry 2024年第9期96卷 406-413页

作者： Liping Zheng Bei Wang Jianze Zhang Wenjie Zhou Jiayi Ren huige Ma Rui Li Chengming Li mingjun hu Jun Yang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Chemistry Nankai UniversityTianjin 300071China School of Materials Science and Engineering Beihang UniversityBeijing 100191China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110GuangdongChina

The use of redox-active organic electrode materials in energy storage is restricted due to their inferior solvent resistance,abysmal conductivity,and the resultant low practical *** address these issues,a class of bipolar p-phenylenediimidazole-based small-molecule compounds are designed and ***π-conjugated backbone of these small molecules allows for electron delocalization on a big conjugation plane,endowing them with good conductivity and reaction ***,when the para-positions of phenylene are occupied by hydroxyl groups,as-formed intramolecular hydrogen bonds(N-H...O)between phenolic hydroxyl groups and the–NH groups of imidazole rings further enhance the structural planarity,resulting in higherπ-conjugation degree and better conductivity,and thus higher utilization of active sites and electrode capacity,proved by both experimental results and theoretical *** optimized composite electrode DBNQ@rGO-45 shows a high specific capacity(∼308 mA h g^(−1)at 100 mA g^(−1))and a long cycling stability(112.9 mA h g^(−1)after 6000 cycles at 2000 mA g^(−1)).The significantly better electrochemical properties for hydroxyl group-containing compounds than those without hydroxyl groups attributed to intramolecular hydrogen bond-induced conjugation enhancement will inspire the structure design of organic electrodes for better energy storage.

关键词： Bipolar P-phenylenedimidazole Intramolecular hydrogenbonds Planarity and conjugationd egree High capacity

Transparent Magnetic Polymer Nanocomposites:Synthesis,Properties and Some Potential Applications

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Transparent Magnetic Polymer Nanocomposites:Synthesis,Proper...

Application of Differential Scanning Calorimetry as Advanced Asphalt Testing Technology: A Comprehensive Review

2013广东材料发展论坛——战略性新兴产业发展与新材料科技创新研讨会

作者： hu mingjun Department of Physics and Materials Science City University of Hong Kong

In the past decades,polymer nanocomposites have attracted a lot of research interests due to its excellent combination properties from nanofillers and polymer matrix Obviously,the integration of inorganic nanofillers into polymer is one of the most important hybrid types,which can bring one or couples of properties of inorganic materials into polymer to make up for performance deficiencies of ***, due to the natural incompatibility between most inorganics and organic substances。the dispersion of inorganic fillers in polymer matrix has been being an intractable *** materials scientists have con—

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Hangtian Ni Jianmin Ma Daquan Sun Lei Xu Senlin Ling mingjun hu Key Laboratory of Road and Traffic Engineering of Ministry of Education， Tongji University Department of Chemistry， Queen's University Kingston School of Transportation and Logistics， Dalian University of Technology

Understanding the thermal mechanism of materials is paramount in the selection， modification， and application of asphalt binders. Differential scanning calorimetry (DSC)， as a thermodynamic technology， offers an efficient approach to assess the thermal properties of asphalt and unveil the underlying mechanisms. This review first introduces the measurement principle， sample preparation， and parameter selection in DSC. Subsequently， the review systematically explores the specific applications of DSC in the asphalt domain， encompassing thermal analysis， performance evaluation， aging investigation， and modification research. DSC， with its high precision and sensitivity， can discern essential differences between asphalts， reflecting their formation processes， disclosing their thermal histories， and predicting their properties. Serving as a fast intrinsic characterization technique， DSC establishes a connection between thermodynamic characteristics and other asphalt material performances， thus broadening its application scope. The review can serve as a potential guide for researchers to investigate the behavior mechanisms of asphalt binders from a thermodynamic perspective， demonstrating the prospects of DSC as an evaluation tool containing multifaceted information about asphalt.

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Steric hindrance modulation of hexaazatribenzanthraquinone isomers for high-capacity and wide-temperature-range aqueous proton battery

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National Science Review 2024年第4期11卷 271-282页

作者： Mingsheng Yang Yuxin Hao Bei Wang Yan Wang Liping Zheng Rui Li huige Ma Xinyu Wang Xiaoming Jing Hongwei Li Mengxiao Li Zhihui Wang Yujie Dai Guangcun Shan mingjun hu Jun Luo Jun Yang School of Materials Science and Engineering Beihang University Beijing Institute of Nanoenergy &Nanosystems Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science & TechnologyGuangxi University School of Chemistry and Chemical Engineering Center on Nanoenergy Research Guangxi University School of Instrumentation Science and Opto-electronics Engineering Beihang University ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of China

Organic materials with rich active sites are good candidates of high-capacity anodes in aqueous batteries,but commonly low utilization of active sites limits their ***,two isomers,symmetric and asymmetric hexaazatribenzanthraquinone（s-HATBAQ and a-HATBAQ）,with rich active sites have been synthesized in a controllable *** has been revealed for the first time that a sulfuric acid catalyst can facilitate the stereoselective formation of *** to the reduced steric hindrance in favor of proton insertion as well as the amorphous structure conducive to electrochemical dynamics,s-HATBAQ exhibits 1.5 times larger specific capacity than ***,the electrode of s-HATBAQ with50% reduced graphene oxide（s-HATBAQ-50%rGO） delivers a record high specific capacity of405 mAh g-1in ***,the assembled MnO2//s-HATBAQ-50%rGO aqueous proton full batteries show an exceptional cycling stability at 25℃ and can maintain ～92% capacity after1000 cycles at 0.5 A g-1at-80℃.This work demonstrates the controllable synthesis of isomers,showcases a wide-temperature-range prototype proton battery and highlights the significance of precise mole cular structure modulation in organic energy storage.

关键词： stereoisomers steric effect aqueous battery super cycling stability ultra-low temperature proton battery

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水平井造斜轨迹的设计通式

石油钻采工艺 1994年第5期16卷 28-32,37页

作者：胡明君胜利石油管理局

水平井选料轨迹有一般造斜、垂直造斜点、目的层水平段、稳斜加下造斜、上选料加稳斜、单一稳斜、双圆弧造斜、单圆弧造斜及单圆弧造斜加水平稳斜轨迹等9种类型。本文推导了这9种水平井造科轨迹的设计公式，对9种水平井的选斜轨迹设计... 详细信息

水平井选料轨迹有一般造斜、垂直造斜点、目的层水平段、稳斜加下造斜、上选料加稳斜、单一稳斜、双圆弧造斜、单圆弧造斜及单圆弧造斜加水平稳斜轨迹等9种类型。本文推导了这9种水平井造科轨迹的设计公式，对9种水平井的选斜轨迹设计公式进行了分析对比，建立了9种造斜轨迹的设计通式。

关键词：水平钻井井眼轨迹设计钻井设计水平井

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生活垃圾焚烧炉渣集料处治土性能与处治机理

建筑材料学报 2019年第2期22卷 308-313页

作者：胡明君李立寒崔华杰同济大学道路与交通工程教育部重点实验室上海201804

为研究生活垃圾焚烧炉渣集料(BAA)对土的处治效果和机理,采用X射线衍射仪(XRD)分析了BAA的化学组成和矿物组成,测定了BAA处治淤泥质土和粉质黏土的承载比(CBR)、无侧限抗压强度和回弹模量,分析了BAA掺量、BAA养生龄期、饱水和干湿循环... 详细信息

为研究生活垃圾焚烧炉渣集料(BAA)对土的处治效果和机理,采用X射线衍射仪(XRD)分析了BAA的化学组成和矿物组成,测定了BAA处治淤泥质土和粉质黏土的承载比(CBR)、无侧限抗压强度和回弹模量,分析了BAA掺量、BAA养生龄期、饱水和干湿循环条件等因素对处治土强度和变形特性的影响,探究了BAA对土的处治机理.结果表明:随着BAA掺量的增加,养生龄期的延长,2种处治土的CBR值、回弹模量和水稳定性均呈增大趋势;BAA对粉质黏土性能的提升效果优于对淤泥质土性能的提升效果;BAA的摩阻效应及其提供的水硬特性和火山灰反应是处治土性能提升的主要原因.综合考虑,推荐采用高活性BAA对土进行处治,并适当提高BAA掺量,延长养生龄期.

关键词：路基工程炉渣集料处治土炉渣集料掺量养生龄期性能处治机理

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炉渣沥青混合料路用性能与浸出特性试验研究

建筑材料学报 2019年第3期22卷 480-486页

作者：胡明君李立寒王琎晨杨昆同济大学道路与交通工程教育部重点实验室上海201804 浙江省交通规划设计研究院有限公司浙江杭州310006 上海市政养护管理有限公司上海201105

在AC-20沥青混合料中,以不同掺量、不同粒径的生活垃圾焚烧炉渣集料替代天然集料,用马歇尔设计方法进行配合比设计,并进行路用性能检验及浸出特性研究,分析炉渣集料的粒径、掺量对混合料路用性能的影响,同时研究混合料对炉渣集料溶出物... 详细信息

在AC-20沥青混合料中,以不同掺量、不同粒径的生活垃圾焚烧炉渣集料替代天然集料,用马歇尔设计方法进行配合比设计,并进行路用性能检验及浸出特性研究,分析炉渣集料的粒径、掺量对混合料路用性能的影响,同时研究混合料对炉渣集料溶出物的稳定作用.结果表明:混合料的动稳定度随着炉渣集料掺量的提高先减后增,随着炉渣集料粒径增大而减小;混合料低温弯拉应变随炉渣集料掺量的提高先增后减,10%掺量的0~4.75mm粒径炉渣集料对混合料低温性能提升明显;0%~10%掺量的0~4.75mm粒径炉渣集料能提高混合料的水稳定性能;随炉渣集料掺量减少、粒径增大,混合料对炉渣集料溶出物的稳定效果增强.综合试验结果,推荐用于AC-20沥青混合料的炉渣集料适宜粒径为0~4.75mm,适宜掺量为10%.

关键词：道路工程生活垃圾焚烧炉渣沥青混合料路用性能浸出特性