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Recent research progress on the phase-field model of microstructural evolution during metal solidification

International Journal of Minerals,Metallurgy and materials 2023年第11期30卷 2095-2111页

作者： Kaiyang Wang Shaojie Lv Honghui Wu Guilin Wu Shuize Wang Junheng Gao Jiaming Zhu Xusheng Yang Xinping Mao Beijing advanced Innovation Center for materials Genome Engineering Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Institute of materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Solidification structure is a key aspect for understanding the mechanical performance of metal alloys,wherein composition and casting parameters considerably influence solidification and determine the unique microstructure of the *** following the principle of free energy minimization,the phase-field method eliminates the need for tracking the solid/liquid phase interface and has greatly accelerated the research and development efforts geared toward optimizing metal solidification *** recent progress in the application of phasefield simulation to investigate the effect of alloy composition and casting process parameters on the solidification structure of metals is summarized in this *** effects of several typical elements and process parameters,including carbon,boron,silicon,cooling rate,pulling speed,scanning speed,anisotropy,and gravity,on the solidification structure are *** present work also addresses the future prospects of phase-field simulation and aims to facilitate the widespread applications of phase-field approaches in the simulation of microstructures during solidification.

关键词： solidification process phase-field models microstructure evolution alloy composition casting process parameters

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Chestnut shell-like N-doped carbon coated NiCoP hollow microspheres for hybrid supercapacitors with excellent electrochemical performance

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Frontiers of materials Science 2022年第1期16卷 141-155页

作者： Liangshuo LI Lin QIN Xin FAN Xinyu LI Guangxi Key laboratory of Optical and Electronic materials and Devices College of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China College of Science Guilin University of TechnologyGuilin 541004China

In this work,transition metal phosphides(TMPs)were reinforced by a solvothermal synthesis method and in situ polymerization in dopamine with one-step phosphating and carbonizing process to form chestnut shell-like N-doped carbon coated NiCoP(NiCoP@N-C)hollow *** morphologic structure is still reflected in NiCoP@N-C,which is suitable for rapid electron and electrolyte *** from the excellent structure,the coating of N-doped carbon,and the synergistic effect of Ni and Co,NiCoP@N-C reveals excellent electrochemical properties(high specific capacitance of 1660 F·g^(-1)(830 C·g^(-1))at 1 A·g^(-1)).In addition,a NiCoP@N-C//carbonization HKUST-1(HC)achieves high specific energy of 51.8 Wh·kg^(-1),ultrahigh specific power of 21.63 kW·kg^(-1),and excellent cycling stability up to 10000 cycles(a capacitance retention of 96.7%).The results show that the NiCoP@N-C electrode material has a wide application in supercapacitors and other energy storage devices.

关键词： chestnut shell-like sphere hybrid supercapacitor NiCoP@N-C N-doped carbon

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Fundamental study towards a better understanding of low pressure radio-frequency plasmas for industrial applications

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Chinese Physics B 2022年第8期31卷 14-36页

作者： Yong-Xin Liu Quan-Zhi Zhang Kai Zhao Yu-Ru Zhang Fei Gao Yuan-Hong Song You-Nian Wang Key laboratory of materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

Two classic radio-frequency(RF) plasmas, i.e., the capacitively and the inductively coupled plasmas(CCP and ICP),are widely employed in material processing, e.g., etching and thin film deposition, etc. Since RF plasmas are usually operated in particular circumstances, e.g., low pressures(m Torr-Torr), high-frequency electric field(13.56 MHz-200 MHz),reactive feedstock gases, diverse reactor configurations, etc., a variety of physical phenomena, e.g., electron resonance heating, discharge mode transitions, striated structures, standing wave effects, etc., arise. These physical effects could significantly influence plasma-based material processing. Therefore, understanding the fundamental processes of RF plasma is not only of fundamental interest, but also of practical significance for the improvement of the performance of the plasma sources. In this article, we review the major progresses that have been achieved in the fundamental study on the RF plasmas,and the topics include 1) electron heating mechanism, 2) plasma operation mode, 3) pulse modulated plasma, and 4) electromagnetic effects. These topics cover the typical issues in RF plasma field, ranging from fundamental to application.

关键词： RF plasma electron heating discharge mode pulse modulation electromagnetic effects

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Microstructure and properties of as-cast Zr-2.5Nb-1X(X=Ru,Mo,Ta and Si) alloys for biomedical application

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Rare Metals 2023年第10期42卷 3497-3509页

作者： Xi-Nu Tan Fei-Tao Li Yu-Shun Liu Ri-Sheng Qiu Qing Liu Electron Microscopy Center College of Materials Science and EngineeringChongqing UniversityChongqing400044China International Joint laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400044China TU Ilmenau Chair Materials for Electrical Engineering and ElectronicsInstitute of Materials Science and Engineering and Institute of Micro-and Nanotechnologies MacroNanoIlmenau98693Germany Department of Mechanical Engineering University of ManitobaWinnipegMBR3T 5V6Canada Key laboratory for Light-Weight materials Nanjing Tech UniversityNanjing210009China

The micro structure and properties of as-cast Zr-2.5Nb-1X(X=Ru,Mo,Ta and Si) alloy are screened to explore novel biomedical zirconium alloys for magnetic resonance *** micro structure and phase transformation were characterized using X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).Hardness test,magnetic detection and electrochemical corrosion measurements are taken to present *** results show that all alloys consist of α-Zr,β-Zr and ω-Zr.α-Zr and β-Zr mainly exist in the form of parallel and intersecting plates,and nanoscale ω-Zr is dispersed in β-Zr ***,blocky ω-Zr with needle-like α-Zr is only found in plate-free blocks of Zr-2.5Nb-1Mo/Ru *** orientation relationship(OR) between α-Zr and ω-Zr follows [1120]_α//[1101]_ω and(0001)_α//([1011]_ω 011)_ω.Combining this OR with the OR between β-Zr and ω-Zr,the transformation relationship between β-Zr/ω-Zr and α-Zr is also ***-2.5Nb-1Ru alloy with high corrosion potential(-0.500 V),low corrosion rate(0.949 μm·year^(-1)) and low magnetic susceptibility(92×10^(-6)) shows great potential to be a novel biomedical implant with magnetic resonance imaging *** on the experimental results,the possible relationship among alloying elements,micro structure and properties has been established in these Zr-2.5Nb-1X alloys.

关键词： Zirconium alloy Microstructure Phase transformation Electrochemical corrosion Magnetic susceptibility

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Sunlight activated ultra-stable long persistent luminescence glass ceramic for outdoor information display

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Journal of advanced Ceramics 2022年第6期11卷 974-983页

作者： Jingtao ZHAO Lei LEI Renguang YE Junjie ZHANG Xianghua ZHANG Shiqing XU Key laboratory of Rare Earth Optoelectronic materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and DevicesChina Jiliang UniversityHangzhou 310018China laboratory of Glasses and Ceramics Univ RennesCNRSISCR(Institute des Sciences Chimiques de Rennes)UMR CNRS 6226University of Rennes 1Rennes 35042France

Natural sunlight activated persistent luminescence(PeL)is ideal candidate for optical information display in outdoors without the requirement of electric *** the brightness and duration,the stability especially water resistance of the PeL materials is of significant importance for practical application,which remains a great obstacle up to ***,we report a new sunlight activated PeL glass ceramic containing hexagonal Sr_(13)Al_(22)Si_(10)O_(66):Eu^(2+)crystals,which exhibits strong blue PeL and can last more than 200 *** PeL can be charged by the full wavelengths located in AM 1.5G due to the broad distribution of traps in the crystal *** PeL is clearly observed by the naked eye even after 24 h upon sunlight irradiation irrespective of the weather,and the photoluminescence intensity only decreased~3.3%after storing in water for 365 *** demonstrate its potential application for thermal and stress responsive display as well as long-term continuous security indication upon sunlight irradiation,which not only save vast energy and reduce environment pollution,but also are appropriate for outdoor usage.

关键词： solar energy persistent luminescence(PeL) glass ceramic optical information display stability

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Controlled growth of ultrathin ferromagneticβ-MnSe semiconductor

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SmartMat 2022年第3期3卷 482-490页

作者： Jingyun Zou Yumeng Yang Dianyi Hu Lixing Kang Chao Zhu Dan Tian Xiaodong Lv Govindan Kutty Yuxi Guo Manzhang Xu Fengyu Li Guo Hong Zheng Liu Division of advanced Nano‐materials Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of SciencesSuzhouChina Jiangsu Key laboratory of Micro and Nano Heat Fluid Flow Technology and Energy application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhouChina School of Information Science and Technology ShanghaiTech UniversityShanghaiChina School of materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore College of materials Science and Engineering Co‐Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjingChina School of Physical Science and Technology Inner Mongolia UniversityHohhotChina Institute of Applied Physics and materials Engineering University of MacaoTaipaMacaoChina Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoTaipaMacaoChina

Two-dimensional(2D)magnetic crystals with intrinsic ferromagnetism are highly desirable for novel spin-electronic ***,the controllable synthesis of 2D magnets,especially the direct growth of 2D magnets on substrate surfaces,is still a ***,we demonstrate the synthesis of ultrathin zinc-blende phase manganese selenide(β-MnSe)nanosheets using the chemical vapor deposition(CVD)*** 2Dβ-MnSe crystals exhibit distinct ferromagnetic properties with a Curie temperature of 42.3 *** functional theory(DFT)calculations suggest that the ferromagnetic order inβ-MnSe originates from the exchange coupling between the unsaturated Se and Mn *** study presents significant progress in the CVD growth of ultrathin 2D magnetic materials by thinning bulk magnets,and it will pave the way for the building of energy-efficient spintronic devices in the future.

关键词： 2D ferromagnetism controllable growth manganese selenide morphological engineering nonlayered crystals

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Fabrication and Properties of Multilayer Chitosan Membrane Loaded with Tinidazole

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Journal of Wuhan University of Technology(materials Science) 2007年第1期22卷 102-107页

作者：洪华刘昌胜 Engineering research Center of Biomedical materials under Ministry of Education East China University of Science and Technology

With the aim of providing effective periodontal disease therapeutic method, multilayer membranes which were loaded with drug for guided tissue regeneration were prepared using an immerseprecipitation phase inversion technique. Single layer, bi-layer and tri-layer membranes were fabricated with chitosan used as cartier and tinidazole as medicine model which was loaded on the membrane. The influence of layer on structure and properties of membrane were studied by SEM, UV spectrophotometer and mechanical test. Drug release properties of three types of layer membranes were also investigated. The results showed that release rate could be slown down in both bi-layer and tri-layer membranes （to 11 days and 14 days respectively） and tri-layer membrane lasted the longest. After a process of rapid release, the concentration of tinidazole which was released by the membrane was maintained at an efficient dosage level. Compared with single layer and bi- layer membranes, we found tri-layer membrane could play a role in controlling low-rate drug release especially at the early stage of release, and keep an efficient dosage at affected part for a long period of time. The loss of drug which loaded on membrane decreased from 84.6% for single layer to 13.04% for tri-layer. The mechanical strength of three types of membrane were detected and showed that it could meet the requiremens of clinical practice. The membranes especially with tri-layer could be more valuable in application.

关键词： chitosan membrane multilayer drug loss release rate

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Boosting the electrochromic performance of TiO_(2) nanowire film via successively evolving surface structure

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Science China Chemistry 2021年第5期64卷 745-752页

作者： Baohu Dai Changzheng Wu Yi Xie Department of Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Chemistry for Energy materials University of Science and Technology of ChinaHefei 230026China CAS Key laboratory of Mechanical Behavior and Design of materials University of Science and Technology of ChinaHefei 230026China

Electrochromic transition metal oxides(ETMOs)are useful in energy saving devices and smart *** these ETMO candidates,titanium dioxide(TiO_(2))is intriguing for its abundance and environmental safety,but the low color efficiency and slow coloring rate are still barricades to promote its electrochromic ***,we demonstrate an amorphization strategy to comprehensively enhance the performance of TiO_(2) nanowire film(TNF)via atomic layer deposition(ALD)of an additional TiO_(2) conformal layer onto TNF surface,of which the layer structure evolves successively from ordered to disordered,achieving tunable electrochromism by controlling ALD *** the remarkable increment of charging efficiency by~35% and color efficiency by~40%,bleached transmittance rectified optical density(BTR density)and ion diffusion coefficient are boosted by~90% and over 15 times,respectively for TNF deposited with 150 cycles.A large number of self-doped Ti^(3+) defects and hydroxyl units together with order-disorder interconnections in the ALD TiO_(2) layer are responsible for the performance *** concept for successively evolving surface structure shares the feasibility of upgrading conventional ETMOs as well as designing new electrochromic materials.

关键词： electrochromism TiO_(2) evolving surface structure BTR density ALD

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Fabricating a hollow cuboctahedral structure for N-doped carbon coated p-n heterojunctions towards high-performance photocatalytic organic transformation

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Nano research 2022年第5期15卷 4638-4645页

作者： Hao Gao Liming Sun Mengge Li Wenwen Zhan Xiaojun Wang Xiguang Han Jiangsu Key laboratory of Green Synthetic Chemistry for Functional materials School of Chemistry and Chemical EngineeringJiangsu Normal UniversityXuzhou 221116China

The application of semiconductors-based photocatalysts in organic transformation has been limited by the low light utilization efficiency and the rapid recombination of photo-induced charge *** this paper,we have successfully fabricated a hollow cuboctahedral nanostructure(CNNCH),which is composed of N-doped carbon layer and CuO/NiO p-n *** hollow structure in CNNCH can effectively favor the light utilization through the multiple light reflection and *** separation of photo-induced charge carriers can be highly improved by the exitence of charge transfer pathways between the p-n heterojunctions and semiconductor/N-doped carbon layer *** to the above advantages,hollow cuboctahedral CNNCH as the photocatalyst has behaved high performance towards the photocatalytic cross-dehydrogenative coupling reaction.

关键词： organic transformation p-n heterojunction N-doped carbon semiconductor hollow structure

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Self-cleaning semiconductor heterojunction substrate: ultrasensitive detection and photocatalytic degradation of organic pollutants for environmental remediation

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Microsystems & Nanoengineering 2020年第1期6卷 27-36页

作者： Mingyue Hu Yingnan Quan Shuo Yang Rui Su Huilian Liu Ming Gao Lei Chen Jinghai Yang Key laboratory of Functional materials Physics and Chemistry of the Ministry of Education Jilin Normal University130103 ChangchunPeople’s Republic of China National Demonstration Centre for Experimental Physics Education Jilin Normal University136000 SipingPeople’s Republic of China Key laboratory of Preparation and application of Environmental Friendly materials Jilin Normal UniversityMinistry of Education130103 ChangchunPeople’s Republic of China College of Science Changchun University130022 ChangchunPeople’s Republic of China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130103 ChangchunPeople’s Republic of China

Emerging technologies in the field of environmental remediation are becoming increasingly significant owing to the increasing demand for eliminating significant amounts of pollution in water,soil,and *** designed and synthesized MoS 2/Fe 2 O 3 heterojunction nanocomposites(NCs)as multifunctional materials that are easily separated and *** trace detection performance of the prepared sample was examined using bisphenol A(BPA)as the probe molecule,with limits of detection as low as 10−9 M;this detection limit is the lowest among all reported semiconductor *** was subjected to rapid photocatalytic degradation by MoS_(2)/Fe_(2)O_(3) NCs under ultraviolet *** highly recyclable MoS_(2)/Fe_(2)O_(3) NCs exhibited photo-Fenton catalytic activity for BPA and good detection ability when reused as a surface-enhanced Raman scattering(SERS)substrate after *** SERS and photocatalysis mechanisms were proposed while considering the effects of the Z-scheme charge-transfer paths,three-dimensional flower-like structures,and dipole–dipole ***,the prepared MoS_(2)/Fe_(2)O_(3) NCs were successfully applied in the detection of BPA in real lake water and milk ***,we present insights into the development of MoS_(2)/Fe_(2)O_(3) materials,which can be used as multifunctional materials in chemical sensors and in photocatalytic wastewater treatments for the removal of recalcitrant organic pollutants.

关键词： dipole photocatalytic ultraviolet

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