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Interconnected graphene/polymer micro-tube piping composites for liquid sensing

Nano Research 2014年第6期7卷 869-876页

作者： Tingting Yang Hongze Zhang Yan Wang Xiao Li Kunlin Wang Jinquan Wei Dehai Wu Zhihong Li hongwei zhu School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Materials Processing Technology of MOE Tsinghua University 8eijing 100084 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of Microelectronics Peking University Beijing 100871 China Department of Physics and Nanoscience and Nanotechnology Laboratory Institute for Advanced Study Nanchang University Nanchang 330031 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Detection and analysis of volatile organic compounds (VOCs) as pollutants in the atmosphere and liquids are of great significance because of the detrimental effects of VOCs. A polymer-coated graphene micro-tube piping (GMP) structure with a cross-linked and interconnected channel network was synthesized for liquid sensing. By virtue of their unique cross-linked and interconnected channel network configuration, polycrystalline conformation, and the support of a polymer layer, the resistivity of the 3D hollow micro-tubing GMPs was sensitive to strain, ensuring high sensitivity of the liquid sensor (R/R 0 of ∼4 × 103% for pure acetone and R/R 0 of ∼105% for 0.01 wt.% acetone solution). Due to the capillary force, the interfaces of the 3D structures can speed up the penetration of solvents into the polymer, thus promote distinct selectivity within seconds and significantly decrease the response time. Owing to their good selectivity, high sensitivity, rapid response and flexibility, and the ease of use of the sensors and the simplicity of the fabrication processes, the GMP/polymer composites should be a good candidate for liquid sensing.

关键词：聚合物复合材料液体传感器检测微管连接石墨挥发性有机化合物复合管

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High-performance RF Switch in 0.13 μm RF SOI process

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Journal of Semiconductors 2019年第2期40卷 25-28页

作者： Hong Guan Hao Sun Junlin Bao Zhipeng Wang Shuguang Zhou hongwei zhu School of Microelectronics Xidian University Semiconductor Manufacturing International Corporation

A high-performance single-pole single-throw(SPST) RF switch for mobile phone RF front-end modules(FEMs) was designed and characterized in a 0.13 μm partially depleted silicon-on-insulator(PD SOI) process. In this paper, the traditional seriesshunt configuration design was improved by introducing a suitably large DC bias resistor and leakage-preventing PMOS, together with the floating body technique. The performance of the RF switch is greatly improved. Furthermore, a new Ron × Coff testing method is also proposed. The size of this SPST RF switch is 0.2 mm2. This switch can be widely used for present 4 G and forthcoming 5 G mobile phone FEMs.

关键词： RF switch SOI insertion loss isolation linearity

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Controllable preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He hongwei zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

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燃煤电站锅炉氨燃烧研究进展及展望

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华中科技大学学报（自然科学版） 2022年第7期50卷 55-65页

作者：徐静颖朱鸿玮徐义书于敦喜华中科技大学能源与动力工程学院湖北武汉430074 华中科技大学煤燃烧国家重点实验室湖北武汉430074

针对电站锅炉中的氨燃烧应用,首先介绍氨的基本物理化学性质、纯氨燃烧及氨与气/液体燃料混合燃烧的基础研究;然后针对新兴的燃煤电站锅炉掺氨燃烧技术,分别从氨-煤混合燃烧的燃烧与火焰传播特性、火焰形态及辐射特性、NO_(x)生成与排... 详细信息

针对电站锅炉中的氨燃烧应用,首先介绍氨的基本物理化学性质、纯氨燃烧及氨与气/液体燃料混合燃烧的基础研究;然后针对新兴的燃煤电站锅炉掺氨燃烧技术,分别从氨-煤混合燃烧的燃烧与火焰传播特性、火焰形态及辐射特性、NO_(x)生成与排放特性等介绍当前研究进展;最后对电站锅炉氨燃烧的未来研究方向进行了分析和展望.氨-煤混燃可大幅降低电站锅炉碳排放,而对炉内温度特性无显著改变,虽然燃料氮的增加带来NO_(x)排放风险,但可以通过燃烧分级、燃烧组织等方式有效调控,因此氨-煤混燃是一种可行的减碳路径.以氨作为可再生能源的载体,实现热力、电力、动力等不同应用领域中的碳减排,并缓解或解决对有限化石能源的依赖,具有巨大的发展潜力和前景.

关键词：氨煤锅炉燃烧碳减排

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Assessment of the Respiratory Disease Mortality Risk from Single and Composite Exposures to PM_(2.5)and Ozone—Guangzhou City,Guangdong Province,China,2018-2021

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China CDC weekly 2024年第34期6卷 857-861,I0001-I0006页

作者： hongwei Tu Yijun Hu Keqi Hu Peipei Dong Yue Wen Jing Jiang Xuedan Xu Jinxu Huang Jiemin zhu Changyun He Qiuxia Chen Yongying Liu Guangdong Provincial Center for Disease Control and Prevention Guangzhou CityGuangdong ProvinceChina Jinan University Guangzhou CityGuangdong ProvinceChina Department of Science and Education Guangdong Second Provincial General HospitalGuangzhou CityGuangdong ProvinceChina Sun Yat-sen University Guangzhou CityGuangdong ProvinceChina

Summary What is already known about this topic?Fine particulate matter(PM_(2.5))and ozone(O_(3))are prevalent pollutants in the atmosphere,which threaten human health,especially the respiratory ***,people are exposed to a mixture of various pollutants in the ***,the single and combined effects of both pollutants need to be investigated.

关键词： environment. ozone Guangdong

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Microwave absorbing properties and magnetic properties of different carbon nanotubes

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Science China(Technological Sciences) 2009年第1期52卷 227-231页

作者： XuChun Gui KunLin Wang JinQuan Wei RuiTao Lü QinKe Shu Yi Jia Chen Wang hongwei zhu DeHai Wu Key Laboratory for Advanced Manufacturing by Materials Processing Technology Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

The microwave absorbing properties and magnetic properties of as-grown Fe-filled carbon nanotubes (CNTs), annealed Fe-filled CNTs, and multi-walled CNTs were studied. Vibrating sample magnetometer results showed that the annealed Fe-filled CNTs have the weakest coercivity and strongest saturation magnetization among the three types CNTs, due to the presence of more ferromagnetic α-Fe nanowires. After annealing, the values increased to 291.0 Oe and 28.0 emu/g and the samples showed excellent microwave absorbing properties. The reflection loss was over 5 dB between 11.6 GHz and 18 GHz with a maximum value of 10.8 dB for annealed Fe-filled CNTs (1.1 wt%)/epoxy composite.

关键词： carbon nanotubes microwave absorbing properties magnetic properties

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Ultra-sensitive graphene strain sensor for sound signal acquisition and recognition

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Nano Research 2015年第5期8卷 1627-1636页

作者： Yan Wang Tingting Yang Junchao Lao Rujing Zhang Yangyang Zhang Miao zhu Xiao Li Xiaobei Zang Kunlin Wang Wenjian YU Hu Jin Li Wang hongwei zhu Department of Physics and Institute for Advanced Study Nanchang University Nanchang 330031 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Key Laboratory ot Materials Processing Technology of MOE Tsinghua University Beijing 100084 China Department of ComputerScience and Technology Tsinghua University Beijing 100084 China 2D Carbon Graphene Material Co. Ltd. Changzhou 213149 China

为健全信号获得和识别的一个便携、高精确的传感器从编织的特殊设计的 graphene 的薄电影被制作织物(GWF ) 。在被拉长之上，随机的裂缝的高密度出现在网络，它减少当前的小径，从而增加电阻。因此，这部电影能对人的喉咙作为一个紧张... 详细信息

为健全信号获得和识别的一个便携、高精确的传感器从编织的特殊设计的 graphene 的薄电影被制作织物(GWF ) 。在被拉长之上，随机的裂缝的高密度出现在网络，它减少当前的小径，从而增加电阻。因此，这部电影能对人的喉咙作为一个紧张传感器起作用以便测量通过肌肉运动，一个声音是否被生产的讲话。超离频敏感允许由提取声波的签名特征的快速、低频率的讲话采样的实现。在这研究， 26 封英语信，典型汉字和音调的代表性的信号，甚至短语和句子被测试，揭示在电阻的明显、典型的变化。而且， graphene 传感器的电阻变化与预告录下的声音完美地反应了。由把人工智能与数字信号处理相结合，我们期望以后，这个 graphene 传感器将能成功地达成复杂声学的系统和听觉的数据的大数量。

关键词：应变传感器声音信号信号采集石墨识别超灵敏数字信号处理英文字母

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Effects of structure and sur-face properties on carbon nanotubes' hydrogen storage characteristics

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Chinese Science Bulletin 2001年第16期46卷 1358-1360页

作者： LI Xuesong zhu hongwei CI Lijie XU Cailu MAO Zongqiang WEI Bingqing LIANG Ji WU Dehai Department of Mechanical Engineering State Key Laboratory ofAutomobile Safety and EnergyTsinghua UniversityBeijing 100084China Institute of Nuclear Energy Technology Tsinghua UniversityBeijing 100084China

Hydrogen adsorption experiments were carried out in special stainless steel vessels at room temperature (298K) and under 10 MPa using self-synthesized multi-walled carbon nanotubes. In the experiments, carbon nanotubessynthesized by the seeded catalyst method were pretreatedby being soaked in chemical reagents or annealed at hightemperature before they were used to adsorb hydrogen, but their capacity for hydrogen storage was still poor. Carbonnanotubes synthesized by the floating catalyst method were found to be able to adsorb more hydrogen. They have ahydrogen storage capacity of over 4% after they wereannealed at high temperatures, which suggested that theycould be used as a promising material for hydrogen storage.

关键词： carbon nanotube hydrogen storage adsorption surface functional group heat treatment.

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Fabrication,structure and compression performance of Inconel 617 superalloy honeycomb

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Rare Metals 2007年第S1期26卷 199-204页

作者： WANG hongwei,WEI Zunjie,zhu Zhaojun,and LI Zhiwei School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

Inconel 617 metal honeycombs with designed porosity,cell size and cell morphology were fabricated using fused deposition modelling rapid prototype *** microstructure and compression properties of Inconel 617 metal honeycomb were *** results indicate that Inconel 617 metal honeycomb structure can be fabricated using fused deposition modelling technique,the processes are simple and the size of honeycomb is *** sintered Inconel 617 honeycombs consist of matrix,γ phase,and grain boundary precipitates,Cr7C3 and M23C6 type *** honeycomb microstructure sintered using fine powder particles are denser than that of coarse powder *** strength and Young’s modulus increase with the relative density of honeycomb *** the influence of the relative density on Young’s modulus is greater than that of yield strength.

关键词： rapid prototype fused deposition modelling metal honeycomb compression properties

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叶形四边形产热体[火积]耗散率最小导热构形优化

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中国科学：技术科学 2022年第7期52卷 1111-1120页

作者：朱鸿威陈林根冯辉君戈延林武汉工程大学热科学与动力工程研究所武汉430205 湖北省绿色化工装备工程技术研究中心武汉430205 武汉工程大学机电工程学院武汉430205

将构形理论与[火积]理论相结合,对已有文献建立的基于常见叶脉形仿生四边形的叶形四边形产热体进行了研究.导出了[火积]耗散率最小时叶形四边形产热体的最优构形,研究了分支高导热材料划分的区间数n和分支高导热材料与中心高导热材料的... 详细信息

将构形理论与[火积]理论相结合,对已有文献建立的基于常见叶脉形仿生四边形的叶形四边形产热体进行了研究.导出了[火积]耗散率最小时叶形四边形产热体的最优构形,研究了分支高导热材料划分的区间数n和分支高导热材料与中心高导热材料的夹角θ对叶形四边形产热体最优构形的影响,比较了叶形四边形产热体在[火积]耗散率最小和最大温差最小下的构形差异.结果表明:叶形四边形产热体在[火积]耗散率最小时的最优构形下平均传热温差最小;随着区间数(n≥20)的增加,叶形四边形产热体的最优长宽比和最小平均温差略微下降,因此增加产热体内高导热通道的复杂程度能降低平均传热温差;叶形四边形产热体以[火积]耗散率和最大温差为优化目标的最优构形有区别,但都在分支高导热材料垂直于中心高导热材料时最佳,且[火积]耗散率最小下的平均温差更小,因此以[火积]耗散率最小为优化目标能更有效地降低产热体内的平均传热温差.

关键词：构形理论 [火积]理论叶形四边形产热体热传导最优构形广义热力学优化

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