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Quantification of particle separation using electrostatically charged spray mist in a dust chamber

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Particuology 2021年第5期19卷 92-98页

作者： Marcel Zillgitt Eberhard Schmidt Institute of Particle Technology Rainer Gruenter StraBeBuilding FFCampusFreudenbergBergische Universitat Wuppertal42119 WuppertalGermany

In order to improve the efficiency of reducing fine dust emissions from diffuse sources,the commonly used water mist can be electrostatically ***,the attraction between particles and droplets increases due to electrostatic field *** the experimental investigations carried out,an electrostatic two-fluid nozzle was used to generate a charged spray mist according to the principle of charging by *** a chamber,dispersed dust was precipitated with the spray mist,while detecting the laser light *** means of comparative measurements it could be shown that faster sedimentation and separation takes place through electrostatic *** variations regarding the use of compressed air and water were investigated and the sedimentation time of the particle-droplet mixture in the chamber was shown.A size distribution was then calculated from the laser light attenuation,which shows that the proportion of small particles decreases with spray ***,the influence of the polarity of droplets and solid particles on the reduction measure was determined.

关键词： Dust separation Spray mist electrostatic Dust chamber Laser light attenuation Charging by induction

Tunable diameter electrostatically formed nanowire for high sensitivity gas sensing

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Nano Research 2015年第7期8卷 2206-2215页

作者： Alex Henning Nandhini Swaminathan Andrey Godkin Gil Shalev Iddo Amit Yossi Rosenwaks Department of Physical Electronics School of Electrical Engineering TeI-Aviv University Ramat-Aviv 69978 Israel

We report on an electrostatically formed nanowire （EFN）-based sensor with tunable diameters in the range of 16 nm to 46 nm and demonstrate an EFN- based field-effect transistor as a highly sensitive and robust room temperature gas sensor. The device was carefully designed and fabricated using standard integrated processing to achieve the 16 nm EFN that can be used for sensing without any need for surface modification. The effective diameter for the EFN was determined using Kelvin probe force microscopy accompanied by three- dimensional electrostatic simulations. We show that the EFN transistor is capable of detecting 100 parts per million of ethanol gas with bare SiO2.

关键词： gas sensing,silicon nanowires, Kelvin probe forcemicroscopy (KPFM), electrostatic confinement,multiple gate transistor

M0S2 dual-gate transistors with electrostatically doped contacts

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Nano Research 2019年第10期12卷 2515-2519页

作者： Fuyou Liao Yaocheng Sheng Zhongxun Guo Hongwei Tang Yin Wang Lingyi Zong Xinyu Chen Antoine Riaud Jiahe Zhu Yufeng Xie Lin Chen Hao Zhu Qingqing Sun Peng Zhou Xiangwei Jiang Jing Wan Wenzhong Bao David Wei Zhang State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and Engineering Fudan UniversityShanghai 200433China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China Institute(rf Semiconductors Chinese Academy of SciencesBeijing 100083China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)such as molybdenum disulfide(M0S2)have been intensively investigated because of their exclusive physical properties for advaneed electronics and *** the present work,we study the M0S2 transistor based on a novel tri-gate device architecture,with dual-gate(Dual-G)in the channel and the buried side-gate(Side-G)for the source/drain regi *** gates can be in depe ndently con trolled without in terfere *** a MoS2 sheet with a thick ness of 3.6 nm,the Schottky barrier(SB)and non-overlapped channel region can be effectively tuned by electrostatically doping the source/drain regions with ***,the extri nsic resista nee can be effectively lowered,and a boost of the ON-state cur re nt can be *** while,the cha nn el c ontrol remai ns efficient under the Dual-G mode,with an ON-OFF current ratio of 3 x 107 and subthreshold swing of 83 mV/*** corresponding band diagram is also discussed to illustrate the device operati on *** no vel device structure ope ns up a new way toward fabricati on of high-performance devices based on 2D-TMDs.

关键词： M0S2 dual-gate tri-gate field effect transistor extrinsic resistance electrostatic doping

EFFECT OF THE OPEN CRACK ON THE PULL-IN INSTABILITY OF AN electrostaticALLY ACTUATED MICRO-BEAM

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Acta Mechanica Solida Sinica 2012年第6期25卷 627-637页

作者： Asadollah Motallebi Mohammad Fathalilou Ghader Rezazadeh Mech. Eng. Dept. Islamic Azad University Mech. Eng. Dept. Urmia University

In this paper, the effects of the open crack on the static and dynamic pull-in volt- ages of an electrostatically actuated fixed-fixed and cantilever micro-beam are investigated. By presenting a mathematical modeling, the governing static and dynamic equations are solved by SSLM and Galerkin-based Reduced Order Model, respectively. Then, each single-side open crack in the micro-beam is modeled by a massless rotational spring and the cracked mode shapes and corresponding natural frequencies are calculated by considering the boundary and patching con- ditions and using transfer matrix methods. Finally, the effects of the crack depth ratio, crack position and crack number on the pull-in voltage of the micro-beams are studied. It is shown that beside the residual stresses created in the machining process, the crack（s） can be initiated, growth and consequently change the pull-in voltage of the system by decreasing the natural frequencies. The results show that the crack position is effective beside the crack depth ratio in decreasing the pull-in voltage. Also it is shown that in the fixed-fixed micro-beam there are several points for the crack location in which, the pull-in voltage is extremum.

关键词： MEMS open crack electrostatic pull-in instability

A Study of Super Nonlinear Motion of electrostatically Coupled Two-Particle System

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Journal of Electromagnetic Analysis and Applications 2010年第10期2卷 588-593页

作者： Haiduke Sarafian University College the Pennsylvania State University York USA.

We consider a pair of nonidentical mechanical pendulums. The bob of each pendulum in addition to its own mass electrically is charged. The pendulums are hung from a common pivot in a vertical plane forming a slanted asymmet-ric ??shaped figure. For arbitrary initial swings that are not necessarily confined to small angles, we analyze the dy-namics of each bob under the influence of gravity’s pull as well as the mutual repulsive Coulombian internal force. The equations describing the motion of the system are a set of highly, supper nonlinear coupled differential equations. Applying Mathematica we solve the equations numerically. For nonidentical parameters describing the pendulums, namely, we show the system behaves chaotically;i.e. the angular position of each pendulum leaves a non-repeatable, chaotic pattern in time. For this coupled two-particle interactive system we show also by folding the time axis, the angular position of one of the pendulums vs. the other traces a Lissajous type curve. Our report includes various traditional phase diagrams and a set of newly designed, useful, phase-type diagrams as well. For a comprehensive understanding about the dynamics of the problem at hand, we provide Mathematica codes conducive to animating the chaotic motion of the system. The generic format of the codes allows adjusting the relevant pa-rameters at will and addressing the “what-if” scenarios.

关键词： Nonlinear Motion electrostatic Interaction Deterministic Chaotic Motion Mathematica

Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel:Performance,kinetics and mechanism

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Journal of Environmental Sciences 2020年第3期32卷 264-276页

作者： Junyi Li Yili Wang Xiaomin Dou Haotian Hao Shuoxun Dong Xia Shao Yanchun Deng College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Beijing Key Lab of Urban Atmospheric Volatile Organic Compounds Pollution Control and Application Beijing Municipal Research Institute of Environmental ProtectionBeijing 100037China

A novel polycyclodextrin-modified magnetic cationic hydrogel(PCD-MCH) was developed and its performance,kinetics and mechanism for the removal of reactive brilliant red X-3B(X-3B) were *** results showed that the zeta-potential of PCD-MCH was 32.8 to16.7 mV at pH *** maximum X-3B adsorption capacity of PCD-MCH was2792.3 mg/*** adsorption kinetics could be well-described by the Weber-Morris model and the homogeneous surface diffusion model(HSDM).Diffusion stages corresponding to surface or film diffusion,intra-particle or wide mesopore diffusion,and narrow mesopore/micropore diffusion occurred at 0-120,120-480 and 480-1200 min,*** latter two diffusion stages were rate-controlling for X-3B adsorption *** the initial X-3B concentration of 600 mg/L,the diffusion coefficient(Ds) and external mass transfer coefficient in the liquid phase(kF) were 3x10^-11 cm^2/min and 4.68 x 10^-6 cm/min,respectively.X-3B approaching the center of PCD-MCH particles could be observed at 360 *** the end of the third diffusion stage,the Cp at q/qe=0 was 45.20 mg/L,which was close to the homogeneous Cp value of 46 mg/L along the radius of PCD-MCH *** pH 3.0-10.0,PCD-MCH showed stable X-3B adsorption *** five regeneration-reuse cycles,the residual adsorption capacity of regenerated PCD-MCH was higher than 892.7 mg/*** corresponding adsorption mechanism was identified as involving electrostatic interactions,cyclodextrin cavities and hydrogen bonds,of which cyclodextrin cavities showed prominent capture performance towards dye molecules through the formation of inclusion complexes.

关键词： Adsorption Polycyclodextrin-magnetic cationic hydrogel Reactive brilliant red X-3B Homogeneous surface diffusion model(HSDM) electrostatic interactions Inclusion complexes

Spray-coated electret materials with enhanced stability in a harsh environment for an MEMS energy harvesting device

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Microsystems & Nanoengineering 2021年第1期7卷 151-159页

作者： Anxin Luo Yixin Xu Yulong Zhang Mi Zhang Xiaoqing Zhang Yan Lu Fei Wang School of Microelectronics Southern University of Science and Technology518055 ShenzhenChina State Key Laboratory of AMS-VLSI Institute of MicroelectronicsUniversity of Macao(UM)999078 MacaoChina Department of Electrical and Computer Engineering FSTUM999078 MacaoChina Engineering Research Center of Integrated Circuits for Next-Generation Communications Ministry of EducationSouthern University of Science and Technology518055 ShenzhenChina Department of Mechanical Engineering Boston UniversityBostonMAUSA College of New Materials and New Energies Shenzhen Technology University518118 ShenzhenChina Shanghai Key Laboratory of Special Artificial School of Physics Science and Engineering Tongji University200092 ShanghaiChina

The charge stability of electret materials can directly affect the performance of electret-based devices such as electrostatic energy *** this paper,a spray-coating method is developed to deposit an electret layer with enhanced charge *** long-term stability of a spray-coated electret is investigated for 500 days and shows more stable performance than a spin-coated layer.A second-order linear model that includes both the surface charge and space charge is proposed to analyze the charge decay process of electrets in harsh environments at a high temperature(120°C)and high humidity(99%RH);this model provides better accuracy than the traditional deep-trap *** further verify the stability of the spray-coated electret,an electrostatic energy harvester is designed and fabricated with MEMS(micro-electromechanical systems)*** electret material can work as both the bonding interface and electret layer during fabrication.A maximum output power of 11.72μW is harvested from a vibrating source at an acceleration of 28.5 m/*** the energy harvester with the spray-coated electret is exposed to a harsh environment(100°C and 98%RH),an adequate amount of power can still be harvested even after 34 h and 48 h,respectively.

关键词： stability. stability electrostatic

A fast algorithm for calculating surface electric field of converter valve shield system by multipole boundary element method

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Science China(Technological Sciences) 2018年第11期61卷 1745-1754页

作者： SHI YuXin WANG ZeZhong Beijing Key Laboratory of High Voltage & EMC North China Electric Power University

The surface electric field analysis of the converter valve shield system is a large-scale electrostatic field problem, which is difficult to analyse. The fast multipole boundary element method(FMBEM), which is suitable for solving large-scale problems,can accelerate the computation speed and conserve memory. However, the coefficient matrix implicitly formed by using the FMBEM is sometimes ill-conditioned, especially for large-scale problems; thus, the convergence of iteration is poor. In this paper, a fast solver is proposed to improve efficiency. First, an adaptive GMRES(m) with variant restart parameter is adjusted for the Galerkin FMBEM. In addition, the sparse approximate inverse preconditioner is improved, and a new sparsity pattern is proposed for the multiscale problem derived from the converter valve shield system. The numerical results show that the accuracy can meet the engineering requirements compared with the finite element method. Compared with other solvers and preconditioners, the algorithm can achieve a satisfactory convergence rate and reduce the computation time. In addition, a single bridge shield system of ±160 kV converter valve is successfully analysed using the proposed method.

关键词： converter valve electrostatic field fast multipole boundary element method (FMBEM) GMRES preconditioner

Engineering Interlayer Hybridization in Energy Space via Dipolar Overlayers

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Chinese Physics Letters 2023年第8期40卷 92-98页

作者：邵斌姜肖 Jan Berges 孟胜黄兵 College of Electronic Information and Optical Engineering and Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China Beijing Computational Science Research Center Beijing 100193China Institut für Theoretische Physik Bremen Center for Computational Materials Scienceand MAPEX Center for Materials and ProcessesUniversit?t BremenBremen D-28359Germany Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Beijing Normal UniversityBeijing 100875China

The interlayer hybridization(IH)of van der Waals(vdW)materials is thought to be mostly associated with the unignorable interlayer overlaps of wavefunctions(t)in real ***,we develop a more fundamental understanding of IH by introducing a new physical quantity,the IH admixture ratioα.Consequently,an exotic strategy of IH engineering in energy space can be proposed,i.e.,instead of changing t as commonly used,αcan be effectively tuned in energy space by changing the on-site energy difference(2Δ)between neighboring-layer *** practice,this is feasible via reshaping the electrostatic potential of the surface by deposing a dipolar overlayer,e.g.,crystalline *** first-principles calculations unveil that IH engineering via adjusting 2Δcan greatly tune interlayer optical transitions in transition-metal dichalcogenide bilayers,switch different types of Dirac surface states in Bi_(2)Se_(3)thin films,and control magnetic phase transition of charge density waves in 1H/1T-TaS_(2)bilayers,opening new opportunities to govern the fundamental optoelectronic,topological,and magnetic properties of vdW systems beyond the traditional interlayer distance or twisting engineering.

关键词： interlayer neighboring electrostatic