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supercritical fluid-assisted fabrication of C-doped Co_(3)O_(4) nanoparticles based on polymer-coated metal salt nanoreactors for efficient enzyme-mimicking and glucose sensor properties

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Nano Research 2023年第5期16卷 7431-7442页

作者： Ze-Wen Kang Jun-Yu Zhang Ze-Zhen Li Ranjith Kumar Kankala Shi-Bin Wang Ai-Zheng Chen Institute of Biomaterials and Tissue Engineering Huaqiao UniversityXiamen 361021China Fujian Provincial Key Laboratory of Biochemical Technology(Huaqiao University) Xiamen 361021China Instrumental Analysis Center Laboratory and Equipment Management DepartmentHuaqiao UniversityXiamen 361021China

Nanomaterials doped with non-metallic C have attracted tremendous attention as potential nano-artificial enzymes due to their ability to change the energy band structure to improve their intrinsic ***,we report a green,facile,efficient,fast strategy to access high-performance nanozymes via supercritical CO_(2)fluid technology-fabricated polymer nanoreactor of poly-(methyl vinyl ether-co-maleic anhydride)(PVM/MA)coated Co(NO_(3))_(2)into C-doped Co_(3)O_(4)(C-Co_(3)O_(4))nanozyme by a onestep calcination *** PVM/MA to C doping into Co_(3)O_(4)shortens the entire lattice constant of the crystal structure,and the overall valence band energy level below the Fermi level shifts toward the lower energy *** as-prepared CCo_(3)O_(4)demonstrated significant peroxidase-like catalytic activity,significantly greater than the undoped Co_(3)O_(4)nanoparticle *** following density functional theory(DFT)calculations revealed that the doped nano-enzyme catalytic site displayed a unique electronic structure,altering the material surface with more electrons to fill the anti-bond of the two molecular orbitals,significantly improving the peroxidase-like enzyme catalytic and glucose sensor *** resultant enzymatic glucose sensing in a linear range of 0.1–0.6 mM with a detection limit of 3.86μM is in line with standard Michaelis–Menten ***,this work demonstrates that converting polymers into nanozymes of C-doped form by supercritical CO_(2)fluid technology in a step is an effective strategy for constructing high-performance glucose sensor *** cost-effective,reliable,precise system offers the potential for rapid analyte detection,facilitating its application in a variety of fields.

关键词： supercritical fluid poly-(methyl vinyl ether-co-maleic anhydride)(PVM/MA) C-doped Co_(3)O_(4) nanozymes density functional theory(DFT)calculation

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Reynolds-Averaged Navier-Stokes Equations Describing Turbulent Flow and Heat Transfer Behavior for supercritical fluid

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Journal of Thermal Science 2021年第1期30卷 191-200页

作者： YANG Zheng CHENG Xu ZHENG Xinghua CHEN Haisheng Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China Institute for Applied Thermofluidics Karlsruhe Institute of TechnologyKarlsruhe 76131Germany

supercritical fluid has been widely applied in many industrial *** traditional Reynolds-averaged Navier-Stokes(RANS)equations are directly applied for turbulent flow and heat transfer of the supercritical fluid,ignoring turbulent effect of the thermal physical properties due to the intense *** paper deduces a set of Reynolds-averaged Navier-Stokes equations for supercritical fluid(SCF-RANS equations)to depict turbulent flow and heat transfer of the supercritical fluid taking all the physical parameters as *** SCF-RANS equations include many new correlation terms due to fluctuation of the thermal physical *** methods for the new correlation term have been discussed for closing the SCF-RANS *** of them have relatively mature models,while others are completely new and need profound physical theoretical analysis for proposing reasonable *** paper provides referable information for these new correlations as far as authors *** SCF-RANS equations not only provide the formulation special for flow and heat transfer of the supercritical fluid,but also represent the most sophisticate form of the RANS equations,for every involved physical property has been considered as variable without any simplification.

关键词： SCF-RANS equations supercritical fluid turbulence Reynolds-averaged Navier-Stokes equations

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Insulin Microparticles Produced by supercritical fluid-Assisted Atomization Process

Insulin Microparticles Produced by Supercritical Fluid-Assis...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

作者： Wang Jinxian Zhen Shengxuan Jiang Maoxing Li Jun Department of Chemical and Biochemical Engineering,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,Fujian 361005,China,

supercritical fluid-assisted atomization was employed to produce insulin micropartides from its ethanol/water/CO *** effect of the processing conditions,induding insulin concen- tration,ethanol content and solution fl... 详细信息

关键词： carbon dioxide micropartide insulin supercritical fluid

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Study of Variable Turbulent Prandtl Number Model for Heat Transfer to supercritical fluids in Vertical Tubes

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Journal of Thermal Science 2018年第3期27卷 213-222页

作者： TIAN Ran DAI Xiaoye WANG Dabiao SHI Lin Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Department of Chemical Engineering Tsinghua University

In order to improve the prediction performance of the numerical simulations for heat transfer of supercritical pressure fluids, a variable turbulent Prandtl number(Pr_t) model for vertical upward flow at supercritical pressures was developed in this study. The effects of Pr_t on the numerical simulation were analyzed, especially for the heat transfer deterioration conditions. Based on the analyses, the turbulent Prandtl number was modeled as a function of the turbulent viscosity ratio and molecular Prandtl number. The model was evaluated using experimental heat transfer data of CO_2, water and Freon. The wall temperatures, including the heat transfer deterioration cases, were more accurately predicted by this model than by traditional numerical calculations with a constant Pr_t. By analyzing the predicted results with and without the variable Pr_t model, it was found that the predicted velocity distribution and turbulent mixing characteristics with the variable Pr_t model are quite different from that predicted by a constant Pr_t. When heat transfer deterioration occurs, the radial velocity profile deviates from the log-law profile and the restrained turbulent mixing then leads to the deteriorated heat transfer.

关键词： Turbulent Prandtl Number supercritical fluid Heat Transfer

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A Calorimeter for Measuring the Enthalpy of Solution of Solid Solutes in supercritical fluids and Study on CO2-Naphthlene System

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Chinese Chemical Letters 2001年第1期12卷 79-80页

作者： Xiao Gang ZHANG, Guang Ying YANG , Bu Xing HAN*, Xi Feng ZHANG, Hai Ke YAN Center for Molecular Sciences, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100080 Center for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

An apparatus for measuring the enthalpy of solution of solids in supercritical fluids (SCFs) was constructed. The enthalpy of solution (ΔH) of naphthalene in supercritical (SC) CO2 was measured at 308.15 K in the pressure range from 8~11 MPa. It was found that ΔH was negative in the pressure range from 8 to 10 MPa, and the absolute value of ΔH decreases with increasing pressure. However, ΔH became positive at the pressures higher than 10 MPa. This unusual phenomenon can be explained by clustering between CO2 and naphthalene.

关键词： Solution enthalpy supercritical fluid molecular interaction

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SIMULATION OF PARTICLE COATING IN THE supercritical fluidIZED BED

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China Particuology 2005年第1期3卷 113-124页

作者： Carsten Vogt Ernst-Ulrich Hartge Joachim Werther Gerd Brunner Technical University Hamburg-Harburg D21071 Hamburg Germany

fluidized bed technology using supercritical carbon dioxide both as a fluidizing gas and as a solvent for the coating material makes possible the production of thin, uniform and solvent-free coatings. But operation at low fluidizing velocities, which is favorable to facilitate gas cleaning under the high pressure conditions, may lead to uneven distribution of the coating in the fluidized bed and to unstable operation due to agglomeration. Therefore a model has been developed which describes local fluid dynamics within the high pressure fluidized bed. Based on this model, the coating process is described and the distribution of the coating inside the fluidized bed is calculated. Furthermore a submodel for the calculation of local concentrations of liquid paraffin has been set up, which may be used as a basis for the prediction of agglomeration and thus stability of operation.

关键词： particle coating fluidized bed supercritical fluid fluid mechanics

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Water and partial melting of Earth's mantle

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Science China Earth Sciences 2016年第4期59卷 720-730页

作者： NI HuaiWei ZHANG Li GUO Xuan Chinese Academy of Sciences Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China

Water plays a crucial role in the melting of Earth's mantle. Mantle magmatisms mostly occur at plate boundaries(including subduction zones and mid-ocean ridges) and in some intraplate regions with thermal anomaly. At oceanic subduction zones, water released by the subducted slab may induce melting of the overlying mantle wedge or even the slab itself, giving rise to arc magmatism, or may evolve into a supercritical fluid. The physicochemical conditions for the formation of slab melt and supercritical fluid are still under debate. At mid-ocean ridges and intraplate hot zones, water and CO_2 cause melting of the upwelling mantle to occur at greater depths and in greater extents. Low degree melting of the mantle may occur at boundaries between Earth's internal spheres, including the lithosphere-asthenosphere boundary(LAB), the upper mantletransition zone boundary, and the transition zone-lower mantle boundary, usually attributed to contrasting water storage capacity across the boundary. The origin for the stimulating effect of water on melting lies in that water as an incompatible component has a strong tendency to be enriched in the melt(i.e., with a mineral-melt partition coefficient much smaller than unity), thereby lowering the Gibbs free energy of the melt. The partitioning of water between melt and mantle minerals such as olivine, pyroxenes and garnet has been investigated extensively, but the effects of hydration on the density and transport properties of silicate melts require further assessments by experimental and computational approaches.

关键词： Water Mantle Partial melting Silicate melts Partition coefficient supercritical fluid

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CO_(2) Diffusivity in H_(2)O for supercritical Conditions:A Molecular Dynamics Study

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Journal of Thermal Science 2022年第5期31卷 1407-1415页

作者： CHEN Longfei LIU Dong LI Qiang School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing210094China

supercritical H_(2)O/CO_(2) mixtures(650 K–973 K and 25 MPa,not far away from the critical temperature and pressure of water)have recently been used as the working fluid for a novel power generation system with higher efficiency and zero pollutant emission compared to conventional coal-fired power *** knowledge of the diffusion of these mixtures is important for efficient design of the system ***,both experimental and theoretical data are scarce for typical working conditions in the ***,we investigated both the self-diffusion and the mutual diffusion of the supercritical H_(2)O/CO_(2) mixtures using molecular dynamics(MD)*** show that the mixture diffusion coefficients for supercritical conditions are more than one order of magnitude larger than those in the sub-critical *** results reveal that H_(2)O molecules prefer to gather with themselves rather than with CO_(2) molecules in the near-critical region,while there is no featured molecular structure for higher temperatures in the supercritical ***,the self-diffusion of CO_(2) in H_(2)O in the infinite-dilution regime features Arrhenius temperature dependent behavior in the supercritical region excluding the near-critical-temperature *** molecular interaction mechanisms also provide insights into the mutual diffusion behavior of CO_(2) in H_(2)O,which is well described by the Darken equation in the supercritical ***,engineering equations,namely the Speedy-Angell power-law equation and the Vignes equation,can reproduce MD simulated infinite-dilution self-diffusion coefficients and Maxwell-Stefan mutual diffusion coefficients,respectively,of the supercritical H_(2)O/CO_(2) mixtures.

关键词： supercritical fluid H_(2)O/CO_(2)mixture diffusion molecular dynamics

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Simulated Research of Enhanced Heat Transfer Characteristics of LNG in Rectangular Small Channels with Circumference Micro-Grooves

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Journal of Thermal Science 2023年第3期32卷 1023-1033页

作者： WANG Pingyang ZHAO Xinglin LIU Zhenhua School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

In view of the technical development bottleneck of 3D printing manufacturing compact heat exchanger for supercritical LNG,a new passive enhanced heat transfer technology is proposed by developing circumferential micro-grooves on the top and bottom walls of rectangular small *** simulation of heat transfer enhancement and flow resistance characteristics of LNG in the enhanced channels with micro-grooves is *** geometrical dimensions such as the groove depth,the groove width and the center distance between two adjacent micro-grooves were optimized,and then the heat transfer enhancement and flow of LNG within the range of 120 K-250 K which across the critical temperature after the use of the strengthening technology were ***,further effects of working fluid temperature,mass flow(Reynolds number),and inlet pressure on heat transfer coefficient(Nusselt number),friction factor,and comprehensive coefficient were *** addition,by the analysis of local flow characteristics near the micro-grooves,the heat transfer mechanism is discussed.

关键词： heat transfer enhancement supercritical fluid numerical simulation micro groove

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Theoretical investigations on heat transfer to H2O/CO2 mixtures in supercritical region

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Science China(Technological Sciences) 2020年第6期63卷 1018-1024页

作者： CHEN LongFei LIU Dong ZHANG HanLin LI Qiang MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

The supercritical H2O/CO2 mixture is the working fluid to drive a turbine in a novel power generation system with coal gasified in supercritical *** system is promising because of zero pollution emission in contrast to the conventional coal-fired power *** transfer coefficients of the supercritical H2O/CO2 mixtures are important to design heat transfer devices in this system,which is similar to the role of heat transfer to supercritical water in conventional ***,heat transfer to supercritical mixtures has received less ***,we show that the supercritical mixtures with H2O being one of the components,have similar convection heat transfer behavior to supercritical pure fluids for temperatures and pressures above the critical point of *** phenomenon was demonstrated from two ***,the forced convection heat transfer coefficients of supercritical mixtures were numerically calculated using the simulation model for supercritical pure fluids and using the thermophysical properties(density,heat capacity,thermal conductivity and viscosity)of supercritical mixtures as *** calculated results agree well with experimental data in the supercritical ***,the calculated results also agree well with the correlations for supercritical pure *** mechanisms were investigated by molecular dynamics simulations on the diffusion of supercritical *** results lay the foundation for predicting convection heat transfer coefficients of supercritical mixtures and for designing heat transfer devices with supercritical mixtures as heat transfer fluids.

关键词： supercritical fluid H2O/CO2 mixture forced convection molecular dynamics

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