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LATTICE BOLTZMANN METHOD SIMULATIONS FOR MULTIPHASE FLUIDS WITH REDICH-KWONG EQUATION OF STATE

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Journal of Hydrodynamics 2011年第6期23卷 814-819页

作者： WEI Yi-kun QIAN Yue-hong Shanghai institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 ShanghaiChina

In this article we state that the compression factor of the Redlich-Kwong Equation Of State （EOS） is smaller than that of van der waals EOS. The Redlich-Kwong EOS is in better agreement with experimental data on coexistence curves at the critical point than the van der waals EOS. We implement the Redlich-Kwong EOS in the Lattice Boltzmann Method （LBM） simulations via a pseudo-potential approach. We propose a new force, which can obtain computational stationary and reach larger density ratio. As a result, multi-phase flows with large density ratio （up to 1012 in the stationary case） can be simulated. We perform four numerical simulations, which are respectively related to single liquid droplet, vapor-liquid separation, surface tension and liquid coalescence of two droplets.

关键词： Redlich-Kwong equation of state lattice Bhatager-Gross-Krook models numerical simulations phase transition

Recent progress in MnBi2nTe3n+1 intrinsic magnetic topological insulators: crystal growth, magnetism and chemical disorder

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National Science Review 2024年第2期11卷 65-80页

作者： Chaowei Hu Tiema Qian Ni Ni Department of Physics and Astronomy and California Nano Systems institute University of California-Los Angeles

The search for magnetic topological materials has been at the forefront of condensed matter research for their potential to host exotic states such as axion insulators, magnetic Weyl semimetals, Chern insulators,etc. To date, the MnBi2nTe3n+1family is the only group of materials showcasing van der waals-layered structures, intrinsic magnetism and non-trivial band topology without trivial bands at the Fermi level. The interplay between magnetism and band topology in this family has led to the proposal of various topological phenomena, including the quantum anomalous Hall effect, quantum spin Hall effect and quantum magnetoelectric effect. Among these, the quantum anomalous Hall effect has been experimentally observed at record-high temperatures, highlighting the unprecedented potential of this family of materials in fundamental science and technological innovation. In this paper, we provide a comprehensive review of the research progress in this intrinsic magnetic topological insulator family, with a focus on single-crystal growth, characterization of chemical disorder, manipulation of magnetism through chemical substitution and external pressure, and important questions that remain to be conclusively answered.

关键词： MnBi2Te4 magnetic topological insulator magnetism tuning antiferromagnetism ferromagnetism pressure chemical doping

Stability of Multidimensional Phase Transitions in a Steady van der waals Flow

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Chinese Annals of Mathematics,Series B 2008年第3期29卷 223-238页

作者： Shuyi ZHANG Department of Mathematics and Physics Shanghai Institute of Technology Shanghai 200235 China

In this paper, the author studies the multidimensional stability of subsonic phase transitions in a steady supersonic flow of van der waals type. The viscosity capillarity criterion （in ＂Arch. Rat. Mech. Anal., 81（4）, 1983, 301-315＂） is used to seek physical admissible planar waves. By showing the Lopatinski determinant being non-zero, it is proved that subsonic phase transitions are uniformly stable in the sense of Majda （in ＂Mem. Amer. Math. Soc., 41（275）, 1983, 1-95＂） under both one dimensional and multidimensional perturbations.

关键词： Supersonic flows Subsonic phase transitions Euler equations Multi-dimensional stability

A novel approach towards molecular memory device in gate tunable structure of MoS_(2)-graphene

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Nano Research 2021年第1期14卷 177-184页

作者： Rahul Tripathi Abha Misra Department of Instrumentation and Applied Physics Indian Institute of Sciencey BangaloreKarnataka 560012India

Molecular interaction in two-dimensional(2D)van der waals(vdW)interfaces has drawn tremendous attention for extraordinary materials *** sensing characteristics of molecular interaction has been exploited extensively to reach the detection limit to a few parts-per-billion(ppb)of molecules and far less attention is given to the evolution of persistent current state due to the molecular *** study focuses on molecular memory operation of MoS_(2)-graphene heterostructure based field effect *** resistance state of the device due to the external perturbation of molecules is tuned to get a nearly relaxation free current state at much lower molecular concentration of 10 ppb tofacilitate non-volatile memory features for molecular memory *** ultrafast switching operation in milli-second order is achieved at room temperature for the fastest recovery obtained sofar in any molecular *** process is co-controlled both by molecular as well as external charge density.

关键词： MoS_(2) graphene field effect transistor molecular memory trap charges

BIFURCATION AND DYNAMICS OF THIN SLIPPING FILMS UNder THE INFLUENCE OF INTERMOLECULAR FORCES

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Journal of Hydrodynamics 2006年第2期18卷 248-252页

作者： HU Guo-hui Shanghai institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

The effects of the Born repulsive force on the stability and dynamics of ultra-thin slipping films under the influences of intermolecular forces are investigated with bifurcation theory and numerical simulation. Results show that the repulsive force has a stabilizing effect on the development of perturbations, and can suppress the rupture process induced by the van der waals attractive force. Although slippage will enhance the growth of disturbances, it does not have influence on the linear cutoff wave number and the final shape of the film thickness as time approaches to infinity.

关键词： ultra-thin film dewetting Navier slip boundary condition

Role of capillary adhesion in the friction peak during the tacky transition

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Friction 2022年第8期10卷 1208-1216页

作者： Tianyan GAO Jiaxin YE Kaisen ZHANG Xiaojun LIU Yan ZHANG Kun LIU institute of Tribology School of Mechanical EngineeringHefei University of TechnologyHefei 230009China

The friction peak that occurs in tire–road sliding when the contact changes from wet to dry was previously attributed to capillary cohesion,van der waals attraction,and surface roughness,but the detailed mechanisms have yet to be *** this study,friction and static contact experiments were conducted using a custom-built in situ optical microtribometer,which allowed us to investigate the evolution of the friction,normal load,and contact area between a polydimethylsiloxane(PDMS)film and a silicon nitride ball during water *** friction coefficient increased by 100%,and the normal force dropped by 30%relative to those in the dry condition during the wet-to-dry *** static contact experiments,the probe indentation depth increased,and the normal load decreased by~60%as the water *** the friction and static contact results,we propose that the large friction peak that appeared in this study can be attributed to the combined effects of increased adhesive capillary force and increased plowing during the wet-to-dry transition.

关键词： friction peak capillary adhesion tacky condition polydimethylsiloxane(PDMS)film silicon nitride

Molybdenum disulfide-graphene van der waals heterostructures as stable and sensitive electrochemical sensing platforms

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Tungsten 2020年第4期2卷 411-422页

作者： Stelbin Peter Figerez Kiran Kumar Tadi Krishna Rani Sahoo Rahul Sharma Ravi K.Biroju Aleena Gigi KAiswarya Anand Golap Kalita Tharangattu N.Narayanan Tata institute of Fundamental Research Hyderabad 500046India Division of Healthcare Advancement Innovation and ResearchVellore Institute of Technology(VIT)Chennai 600127India Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466‑8555Japan

Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent ***,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high ***,the van der waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important *** is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high *** proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of *** a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.

关键词： Graphene Molecular sensing MoS_(2)etching MoS_(2)protection van der waals structures Electrochemical sensing Ascorbic acid Dopamine

Hybrid dual-channel phototransistor based on ID t-Se and 2D ReS2 mixed-dimensional heterostructures

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Nano Research 2019年第3期12卷 669-674页

作者： Jingkai Qin Hang Yan Gang Qiu Mengwei Si Peng Miao Yuqin Duan Wenzhu Shao Liang Zhen Chengyan Xu Peide D Ye State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 USA School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School cf Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China

The com bination of mixed-dimensional semiconducti ng materials can provide additional freedom to construct integrated n anoscale electronic and optoelectronic devices with diverse functionalities. In this work, we report a high-performanee dual-channel phototransistor based on one-dimensional (1D)/two-dimensional (2D) trigonal selenium (t-Se)/ReS2 heterostructures grown by chemical vapor deposition. The injection and separati on efficie ncy of photoge nerated electro n-hole pairs can be greatly improved due to the high-quality in terfacial con tact betwee n t-Se nano belts and ReS2 films. Compared with bare ReS2 film devices, the dual-cha nnel phototra nsistor based on t-Se/ReS2 heterostructure exhibits considerable enhancement with the responsivity (R) and detectivity (D^*) up to 98 A·W^-1 and 6 x 10^10 Jones at 400 nm illumination with an in tensity of 1.7 mW·cm^-2, respectively. Besides, the respo nse time can also be reduced by three times of magnitude to less than 50 ms due to the type-11 band alignment at the in terface. This study opens up a promising ave nue for high-performa nee photodetectors by constructing mixed-dimensional heterostructures.

关键词： van der waals heterostructures ReS2 trigonal selenium (t-Se) nanobelt phototransistor

Synthesis and Crystal Structure of Ethyl 4-(2-Chloro-4-fluorophenyl)-6-hydroxy-3-oxo-1,3-dihydro-5-isobenzofurancarboxylate

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Chinese Journal of Structural Chemistry 2010年第1期29卷 43-46页

作者：徐晓倩王晓奎杨世颖郑志兵赵国明李松 institute of Pharmacology and Toxicology Academy of Military Medical Sciences Shenyang Pharmaceutical University institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical College

The crystal structure of the title compound（C17H12ClFO5,Mr=350.72） was determined by single-crystal X-ray *** crystal belongs to monoclinic,space group P21/c,with a=7.693（1）,b=15.767（1）,c=12.986（1）,β=97.23（1）°,V=1562.6（2）3,Z=4,Dc= 1.491 g/cm3,λ（MoKα）=0.71073,F（000）=720,μ（MoKα）=0.280 mm-1,R=0.0563 and wR=0.1674.A total of 3592 unique reflections were collected,of which 2462 with Ⅰ＆gt;2σ（Ⅰ） were ***-membered lactone rings and hydroxyl-substituted phenyl rings are approximately coplanar with their dihedral angle of 4.1°. The dihedral angle between two different phenyl rings is 71.3°. To our interest, intramolecular O（1）-H（1）…O（4） hydrogen bonds could be found in each molecule. Intramolecular hydrogen bonds and intermolecular van der waals force contribute to the stability of the structure.

关键词： isobenzofurancarboxylate phthalide crystal structure synthesis