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Superacid assisted high-throughput production and solution-processing of pristine two-dimensional materials

Materials Today 2025年 86卷 228-237页

作者： Deng, Qixuan Ma, Jiabin Liu, Minsu Zhou, Yicong Ding, Siyuan Zhan, Ke Zhu, Yuan Xiong, Zhiyuan Su, Yang Yu, Kuang Cheng, Hui-Ming Qiu, Ling Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Department of Materials Science and Engineering Monash University VIC3800 Australia Monash Suzhou Research Institute Monash University Suzhou Suzhou SIP215000 China School of Microelectronics Southern University of Science and Technology Shenzhen518055 China School of Light Industry and Engineering South China University of Technology Guangzhou510640 China Shenzhen Key Lab of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences 1068 Xueyuan Road Shenzhen518055 China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced Technology 291 Louming Road Shenzhen518107 China

Pristine two-dimensional (2D) materials have a multitude of interesting properties, promising a broad spectrum of applications. However, their poor affinity for common solvents and tendency to aggregate impede their effective exfoliation and solution-processing into various structures, such as fibers and membranes, thus limiting their practical use. We report a high-efficiency method for producing pristine 2D nanosheets by direct high-speed shearing exfoliation in trifluoromethanesulfonic acid (TfOH). Typically, this method produces hexagonal boron nitride nanosheets (BNNSs) with an unprecedented throughput of 38.8 mg mL-1h−1. The effective exfoliation is attributed to the strong binding affinity, large dipole moment and steric repulsion of TfOH, which collectively introduce layer edge distortion in hexagonal boron nitride (hBN), facilitating its exfoliation. The mechanical exfoliation and reversible edge interaction introduce no additional functional groups to the exfoliated BNNSs. The resulting pristine BNNS exhibit remarkable stability in TfOH solutions at ultrahigh concentrations of 200 mg mL−1 for over 28 days. The viscosity of the highly concentrated BNNS/TfOH dispersion can be adjusted, enabling techniques to produce BNNS-based spheres, fibers, and membranes with high thermal conductivity and mechanical strength, suitable for advanced thermal management applications. Room temperature processed BNNS-based spheres exhibit superior thermal conductivity compared to high temperature processed commercially available hBN or Al2O3 spheres. Moreover, TfOH can also be used to assist the efficient production and solution-processing of other 2D nanosheets, including graphene, molybdenum disulfide and tungsten disulfide, enabling the fabrication of high-quality bulk assemblies. © 2025 Elsevier Ltd

关键词： Molybdenum disulfide

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CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations

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Journal of Hydrodynamics 2019年第6期31卷 1190-1203页

作者： Esmaeil Abbaszadeh Molaei Aibing Yu Zongyan Zhou Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical EngineeringMonash UniversityClaytonVic 3800Australia

Solid-liquid fluidized beds of binary mixtures are widely used in many *** segregation may occur as particles can differ in size,density,or *** studies have been conducted in the past to understand the effects of particlesize and density on the mixing and segregation,but the effect of particle shape has not been well ***,in the present work,CFD-DEM approach is employed to perform a numerical analysis of the effect of particle shape on the particle mixing and segregation phenomenon in liquid fluidization *** particle shapes from oblate to prolate are produced by varying aspect ratio of ellipsoids from 0.25 to 3,and eight binary mixtures of spheres and ellipsoids are *** results show that when oblate or prolate particles are added to spheres,the segregation takes *** segregation degree increases with particle aspect ratio diverging from 1.0 and also liquid superficial *** relationship of mixing index with aspect ratio under different liquid velocities is established,and a detailed explanation is *** is revealed that increasing the projected area and hence the drag force results in the separation of ellipsoidal particles from spheres.

关键词： Mixing segregation binary mixture ellipsoids liquid fluidization CFD-DEM

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Dual-function artificial CA/PVP interlayer for protect Zn anode on improving uniform Zn 2+ ion deposition

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Electrochimica Acta 2025年

作者： Lanlan Fan Xiangguo Zhang Junwen Deng Lei Cao Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems International Institute for Innovation Jiangxi University of Science and Technology Nanchang 330013 China

Aqueous Zn-ion batteries (ZIBs) have come into the public's view because of their low cost, high theoretical capacity and safety. However, uncontrollable dendrite growth on the Zn anode surface is the key reason restricting the long-cycle stability of ZIBs. Herein, a highly water-soluble polyvinylpyrrolidone and cellulose acetate (CA/PVP) interlayer was used to enhance the lifespan of battery cycles and provide excellent suppression of dendrite growth and side reaction generation. On the one hand, the water-soluble PVP can swell in the electrolyte, forming local electrolyte gelation on the surface of the Zn anode, balancing the transmission of Zn 2+ flow. On the other hand, the synergistic effect of carbon based (C=O) and hydroxyl groups (-OH) in the interlayer can facilitate the desolvation of hydrated Zn 2+ . Furthermore, C=O complexes with Zn 2+ ions can increase the hydrophilicity of the Zn anode, reduce interfacial impedance and further optimize Zn 2+ transport kinetics. Subsequently, the Zn||Zn symmetric battery, constructed with a CA/PVP interlayer, is capable of sustaining a prolonged cycling performance exceeding 1000 h at a current density of 0.1 mA cm -2 /0.05 mAh cm -2 . At the same time, the CA/PVP 3% @Zn full cell demonstrate 94% of capacity retention after 300 cycles at 0.5 A g -1 . The successful construction of artificial interfacial layers provides an attractive strategy for the development of high-performance aqueous ZIBs.

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CC@BCN@PANI core-shell nanoarrays as ultra-high cycle stability cathode for Zn-ion hybrid supercapacitors

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Frontiers in Energy 2023年第4期17卷 555-566页

作者： Shixian XIONG Hongcheng KE Lei CAO Yu WANG Qian ZHU Liqin ZHONG Lanlan FAN Feng GU Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices/Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems International Institute for InnovationJiangxi University of Science and TechnologyNanchang330013China

Exploring cathode materials that combine excellent cycling stability and high energy density poses a challenge to aqueous Zn-ion hybrid supercapacitors(ZHSCs).Herein,polyaniline(PANI)coated boron-carbon-nitrogen(BCN)nanoarray on carbon cloth surface is prepared as advanced cathode materials via simple high-temperature calcination and electrochemical deposition *** of the excellent specific capacity and conductivity of PANI,the CC@BCN@PANI core-shell nanoarrays cathode shows an excellent ion storage ***,the 3D nanoarray structure can provide enough space for the volume expansion and contraction of PANI in the charging/discharging cycles,which effectively avoids the collapse of the microstructure and greatly improves the electrochemical stability of ***,the CC@BCN@PANI-based ZHSCs exhibit superior electrochemical performances showing a specific capacity of 145.8 mAh/g,a high energy density of 116.78 Wh/kg,an excellent power density of 12 kW/kg,and a capacity retention rate of 86.2%after 8000 charge/discharge cycles at a current density of 2 A/*** addition,the flexible ZHSCs(FZHSCs)also show a capacity retention rate of 87.7%at the current density of 2 A/g after 450 cycles.

关键词： CC@BCN@PANI cathode Zn-ion hybrid supercapacitor core-shell nanoarrays high energy density ultra-high cycle stability

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CFD-DEM modelling of hydraulic transport of coarse solids in vertical pipelines 20

CFD-DEM modelling of hydraulic transport of coarse solids in...

引用

20th International Conference on Hydrotransport

作者： Abbaszadeh Molaei, E. Kuang, S.B. Zhou, Z.Y. Yu, A.B. Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University Australia

Hydraulic transport of solids in pipelines is an important operation in industries such as metallurgy, mining and mineral processing. The hydraulic behaviour of the solids, i.e. velocity and concentration spatial distributions and pressure drop, in the conveyer pipes should be well understood as it results in developing of a set of correlations which are necessary for the design of hydraulic pipelines. Pipeline slurries exhibit a complex range of flow patterns, depending upon the physical properties of carrier fluid and transported solids, the superficial liquid velocity and concentration of slurry. Most of numerical, theoretical and experimental studies in the area of vertical lifting have been focused on the transportations of fine and medium size solids;and just a few research have been carried out on the vertical hydraulic conveying of coarse particles, particularly in terms of numerical studies. Therefore, in this work, a three-dimensional Discrete Element Model (DEM) and Computational Fluid Dynamics (CFD) are coupled to study the hydraulic transport of coarse solids in vertical conveyers with carrying fluid of water under different operation conditions. The model shows a good agreement with experimental observations both qualitatively and quantitatively, and it captures some specific phenomena related to the coarse particles such as the near-wall hydrodynamic lift force, which keeps the particles away the pipe wall. © BHR Group Hydrotransport 20.

关键词： Pipelines

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Simultaneous desulfurization and denitrification of sintering flue gas via composite absorbent

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Chinese Journal of Chemical Engineering 2016年第8期24卷 1104-1111页

作者： Jie Wang Wenqi Zhong Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Centre for Simulation and Modelling of Particulate Systems Southeast University–Monash University Joint Research School

Experiments on simultaneous absorption of SO_2 and NO_X from sintering flue gas via a composite absorbent NaClO_2/NaClO were carried out. The effects of various operating parameters such as NaClO_2 concentration(ms), NaClO concentration(mp), molar ratio of NaClO_2/NaClO(M), solution temperature(TR), initial solution pH, gas flow(Vg) and inlet concentration of SO_2(CS) and NO(CN) on the removal efficiencies of SO_2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH = 6, TR=55 °C and M = 1.3 under which the average efficiencies of desulfurization and denitrification could reach99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO_2 aqueous solution is favorable for the generation of ClO_2 and Cl_2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.

关键词： Simultaneous desulfurization and denitrification Sintering flue gas Composite absorbent

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A CFD-DEM study of bubble properties in fluidzed beds operated with a single jet 8

A CFD-DEM study of bubble properties in fluidzed beds operat...

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8th World Congress on Particle Technology 2018: Keynotes and Plenaries

作者： Shrestha, Siddhartha Gan, Jieqing Yu, Aibing Zhou, Zongyan Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University VIC3800 Australia

ISBN: (纸本)9781510869769

Bubbles properties play an important role in determining the characteristics of gas-solid fluidized beds and thus influence the bed performance significantly. In this work, the bubble properties are studied by the combined approach of CFD and DEM for bubbling gas-solid fluidized beds operated with a continuous central jet. The process of the continuous injection of a central air jet to the bed is successfully reproduced featured with the formation of series of bubbles which rise through the bed and burst at the bed top. The bubbles are categorised as two types: primary/leading bubbles and trailing bubbles. The size of the primary bubble keeps on increasing with bed height while the size of the trailing bubble decreases since trailing bubble is coalescing with the primary bubble. The primary bubbles although formed at different times are of similar shape while the trailing bubbles are generally elongated in shape. The bubble velocity is distinctly different for primary and trailing bubbles. © 2018 8th World Congress on Particle Technology 2018: Keynotes and Plenaries. All rights reserved.

关键词： Fluidized beds

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Advances in reduction of NO_x and N_2O emission formation in an oxy-fired fluidized bed boiler

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Chinese Journal of Chemical Engineering 2019年第2期27卷 426-443页

作者： Khalid El Sheikh Mohammad Jakir Hossain Khan Mahar Diana Hamid Siddhartha Shrestha Brahim Si Ali G.A.Ryabov Lya A.Dolgushin Mohd Azlan Hussain Tatiana V.Bukharkina Elena A.Gorelova Dmitry Mendeleev University of Chemical Technology of Russia Department of Chemical Engineering Faculty of Engineering University of Malaya Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University All-Russian Thermal Engineering Institute VTI

Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NO_x and N_2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NO_x emissions is strongly sustainable compare to the other approaches. It was assessed that NO_x formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NO_x formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NO_x reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NO_x emission can be achieved through combination of primary and secondary reduction techniques.

关键词： Oxy-fuel combustion Fluidized bed technology Biomass blend Primary/secondary measures NOx emission

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3D CFD-DEM study of gas-solids flow and heat transfer in a full-loop circulating fluidized bed

3D CFD-DEM study of gas-solids flow and heat transfer in a f...

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11th International Conference on Fluidized Bed Technology, CFB 2014

作者： Wahyudi, H. Chu, K.W. Yu, A.B. Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney Australia

In this work, an extended CFD-DEM approach is developed to study the gas-solids flow and heat transfer between bed and riser wall in three-dimensional full-loop circulating fluidized bed. The effects of some operational, such as superficial gas velocity and solids inventory, on the heat transfer coefficient between bed and riser wall are investigated. The governing heat transfer modes such as wall-fluid convection, wall-particle conduction, are then discussed to gain better understanding about heat transfer between bed and wall in circulating fluidized beds. This work demonstrates that the developed 3D CFD-DEM approach could be a useful tool to study the coupled fluid flow and heat transfer in such a complex system.

关键词： Fluidization

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Discrete Particle simulation of Gas-Solid Flow in Air-Blowing Seed Metering Device

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Computer Modeling in Engineering & Sciences 2021年第6期127卷 1119-1132页

作者： Zhengquan Li Pei Zhang Yongchang Sun Chenglin Zheng Liang Xu Dianyu E Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science&TechnologyGanzhou341000China Energy Materials Computing Center Jiangxi University of Science&TechnologyNanchang330013China

In this paper,the gas and seed flow characters in the air-blowing seed metering device are investigated by using the coupled computational fluid dynamics and discrete element method(CFD-DEM)in three dimensions(3D).The method of establishing boundary model based on the computer-aided design(CAD)drawing,has been used to build the boundary model of seed metering *** 3D laser scanning technique and multi-element method are adopted to establish the particle *** a combined numerical and experimental effort,using 3D CFD-DEM software,which is based on the in-house codes,the mechanisms governing the gas and solid dynamic behaviors in the seed metering device have been *** gas velocity field and the effect of different rotational speeds and air pressures on the seeding performance and particle velocity have been studied,similar agreements between numerical and experimental results are *** reveals that the 3D CFD-DEM model established is able to predict the performance of the air-blowing seed metering *** can be used to design and optimize the air-blowing seed metering device and other similar agriculture devices.

关键词： Seed metering device CFD-DEM CAD simulation gas-solid flow

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