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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 20-38页

作者： Qinjin dai Xuefeng Liu Xin Ma Shaojie tian Qinghe Cui Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

Approach from the laboratory to the field: New strategies in the control of mosquito-borne infectious diseases

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Science China(Life Sciences) 2025年第1期68卷 303-305页

作者： Ziqian Xu Lianpan dai jun Liu National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases(NITFID) National Institute for Viral Disease Control and PreventionChineseCenter for Disease Control and PreventionBeijing 102206China CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Vector-borne viruses,transmitted among humans and animal hosts through bites of vectors such as mosquitoes and ticks,pose a great and ongoing threat to public health and biosafety(Yang et al.,2022).Among them,dengue virus-induced epidemics,have dramatically increased worldwide in recent *** report released by the World Health Organization(WHO)at the end of 2023 showed that dengue epidemic globally surged in 2023,with the number of reported cases nearing a historical *** the first four months of 2024,more than 6 million people worldwide were infected by dengue virus,with more than 2,000 *** countries around the world especially the American countries issued warnings,reporting three times the number of dengue cases compared with the same period last *** global climate change,population growth,and urbanization,flaviviral diseases transmitted by Aedes mosquitoes remain a major global biosecurity challenge.

关键词： diseases globally

Adsorption and retention of fracturing fluid and its impact on gas transport in tight sandstone with different clay minerals

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Petroleum Science 2025年第1期22卷 370-383页

作者： Yi-jun Wang Li-jun You Jian Yang Yi-Li Kang Ming-jun Chen Jia-Jia Bai Jian tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Engineering Technology Research Institute of Southwest Oil & Gas Field Company PetroChina School of Petroleum Engineering Changzhou University State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University

To elucidate the adsorption characteristics and retention mechanisms of fracturing fluids in diverse clay minerals, we conducted on-line nuclear magnetic resonance(NMR) and atomic force microscopy(AFM)experiments. The depth and extent of solid phase damage are determined by the ratio between the size of fine fractions in fracturing fluid residue and the pore-throat size in experiments. Poor physical properties(K 0.5 m D) combined with a scattered distribution of retained fracturing fluid is associated with high gas phase recovery permeability, whereas a continuous sheet-like distribution results in low recovery permeability. The expansive surface area and presence of filamentous illite minerals facilitate the multiple winding and adsorption of fracturing fluids, demonstrating strong hydrogen-bonding, multi-layering and multiple adsorption properties. The geological characteristics of the main gas formations exhibit significant variation, and the severity of damage caused by fracturing fluids occurs in diverse sequences. To address this issue, a differentiated strategy for optimizing fracturing fluids has been proposed.

关键词： Clay minerals Formation damage Fracturing fluid retention distribution Adsorption morphology

Magnetism and cryogenic magnetocaloric effect of triangular-lattice LnOF(Ln=Gd,Dy,Ho,and Er) compounds

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Journal of Rare Earths 2025年第1期43卷 98-104,I0004页

作者： Jianjian Gong Lu tian Lei Zhang Zhaojun Mo Yuanpeng Wang jun Shen School of Rare Earths University of Science and Technology of ChinaHefei230026China Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou34119China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing00081China

Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic ***,the crystal structure,magnetic properties,magnetic phase transition(MPT)together with magnetocaloric effect(MCE)of LnOF(Ln=Gd,Dy,Ho,and Er)compounds were *** study shows that these compounds crystallize in the centrosymmetric space group R3m with an ideal triangular *** long-range magnetic ordering is observed above 2 K for LnOF(Ln=Gd,Ho,and Er).However,DyOF compound undergoes an MPT from paramagnetic(PM)to antiferromagnetic(AFM)at the Neel temperature(TN≈4 K).Considerable reversible MCE is observed in these triangular-lattice *** the magnetic field change(μ0ΔH)of 0-2 T,the maximum values of magnetic entropy change(-ΔSMmax)of them are 6.1,9.4,12.7,and 14.1 J/(kg·K),***,the value of ErOF with Ising-like spin is 2.3 times that of GdOF,which provides an approach for exploring magnetic refrigerants with excellent low-field cryogenic magnetocaloric effect.

关键词： Geometric magnetic frustration Magnetic phase transition Magnetocaloric effect Magnetic refrigeration Rare earths

Giant low-field magnetocaloric effect in unstable antiferromagnetic Tm1-xErxNi2Si2（x=0.2,0.4） compounds

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Journal of Rare Earths 2025年第2期43卷 312-318页

作者： Bo Xu Lu tian junfeng Wang Mei Wu Xinqiang Gao Zhenxing Li jun Shen School of Rare Earths University of Science and Technology of China Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of Sciences Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of Technology

Magnetic refrigeration（MR） technology is regarded as an ideal solution for cryogenic applications,relying on magnetocaloric materials which provide necessary chilling effect.A series of polycrystalline Tm1-xErxNi2Si2（x=0.2,0.4） compounds was synthesized,and their magnetic properties,magnetic phase transition together with magnetocaloric effect（MCE） were *** Tm1-xErxNi2Si2（x=0.2,0.4）compounds display a field-induced metamagnetic transition from antiferromagnetic（AFM） to ferromagnetism（FM） in excess of 0.2 T,***,the AFM ground state is *** the field change of 0-2 T,the values of maximal magnetic entropy change(-ΔSMmax) and refrigerant capacity（RC） for Tm0.8Er0.2Ni2Si2compound are 17.9 J/（kg·K） and 83.5 J/kg,*** large reversible MCE under low magnetic fields（≤2 T） indicates that Tm0.8Er0.2Ni2Si2compound can serve as potential candidate materials for cryogenic magnetic refrigeration.

关键词： Cryogenic magnetic refrigeration Magnetocaloric effects Magnetocaloric materials Rare earths TmNi2Si2

Efficiency improvement for post-sulfurized CIGS solar cells enabled by in situ Na doping

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Journal of Energy Chemistry 2025年第2期101卷 324-332页

作者： Zeran Gao Yuchen Xiong Jiawen Wang Shanshan tian Wanlei dai Haoyu Xu Xinzhan Wang Chao Gao Yali Sun Wei Yu National-Local Joint Engineering Laboratory of New Energy Photovoltaic Devices Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province Hebei University

Despite sulfurization offers the advantage of improving the photovoltaic performance in preparing Cu（In,Ga）Se2（CIGS） absorbers,deep level defects in the absorber and poor energy level alignment on the front surface are still main obstacles limiting the improvement of power co nversion efficiency（PCE） in sulfided CIGS solar ***,an in-situ Na doping strategy is proposed,in which the tailing effect of crystal growth is used to promote the sulfurization of CIGS *** is found that the grain growth is supported by Na incorporating due to the enrichment of NaSexnear the upper *** high soluble Na during grain growth can not only suppress intrinsic InCudonor defects in the absorber,but also tailor S distribution in bulk and the band alignment at the heterojunction,which are both beneficial for the effective electron ***,the Na aggregation near the bottom of the absorber also contributes to the crystalline quality increasing and favorable ultra-thin MoSe2formation at back contact,resulting in a reduced barrier height conducive to hole *** of the champion device is as high as 16.76% with a 28% *** research offers new insights into synthesizing CIGS solar cells and other chalcogenide solar cells with superior cell performance when using an intense sulfurization process.

关键词： CBO CIGS Defect In situ doping Sulfurization

Hyperbranched Poly(α-aminonitrile)s Constructed via Catalyst-Free Multicomponent Polymerization of Trialdehydes,Diamines and Trimethylsilyl Cyanide

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Chinese Journal of Polymer Science 2025年第2期43卷 341-349页

作者： tian-Yu Cheng Jian-Qing Ding Yu-Xin Tong jun-Guo Fang Jia Wang School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu241000China Songshan Lake Materials Laboratory Dongguan523808China

Functional hyperbranched polymers,as an important class of materials,are widely applied in diverse ***,the development of simple and efficient reactions to prepare hyperbranched polymers is of great *** this work,trialdehydes,diamines,and trimethylsilyl cyanide could easily undergo multicomponent polymerization under mild conditions,producing hyperbranched poly(α-aminonitrile)s with high molecular weights(M_(w) up to 4.87×10^(4))in good yields(up to 85%).The hyperbranched poly(α-aminonitrile)s have good solubility in commonly used organic solvents,high thermal stability as well as morphological ***,due to the numerous aldehyde groups in their branched chains,these hb-poly(α-aminonitrile)s can undergo one-pot,two-step,four-component post-polymerization with high *** work not only confirms the efficiency of our established catalyst-free multicomponent polymerization of aldehydes,amines and trimethylsilyl cyanide,but also provides a versatile and powerful platform for the preparation of functional hyperbranched polymeric materials.

关键词： Catalyst-free Multicomponent polymerization Hyperbranched polymer Post-polymerization

Thermal-flow-electric coupling performance analysis of a liquid-immersed battery thermal management system

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Science China(Technological Sciences) 2025年第1期68卷 153-172页

作者： Qiang GAO jun tian Chujin BAO Yangfan ZHONG Chengbin ZHANG Yongping CHEN School of Energy and Environment Southeast UniversityNanjing 210096China Battery Testing Center China North Vehicle Research InstituteBeijing 100072China Zhejiang Immertech Co. Ltd.Hangzhou 310000China Alibaba Cloud Computing Co. Ltd.Shenzhen 518100China

Ensuring the safety and performance of lithium-ion batteries(LIBs)is a significant challenge for electric *** tackle this issue,an innovative liquid-immersed battery thermal management system(LIBTMS)using bionic baffles with fish-like perforations is *** thermal-flow-electric coupling characteristics of LIBTMSs with different baffle structures(no baffle,conventional baffle,baffle with circular perforations and baffle with fish-like perforations)are systematically investigated using experimental and numerical *** results indicate that the forced flow scheme exhibits better thermal management performance and voltage equalization than static ***,the LIB temperatures and voltage deviations of different LIBTMSs increase quickly with increasing discharge *** importantly,the innovative LIBTMS exhibits the best thermoelectric performance due to its excellent thermoelectric equilibrium behavior caused by high electrical and temperature consistency,as well as the best overall performance involving the balance between the pressure loss and heat transfer capacity of the *** with other structures,the innovative LIBTMS using baffles with fish-like perforations exhibits a maximum reduction of 10.1%,15.2%,25.8%and 9.0%in LIB maximum temperature,maximum temperature difference,system pressure drop and voltage deviation,respectively,under the same operating ***,for the LIBTMS using baffles with fish-like perforations,the bottom inlet and top outlet configuration and coolant precooling are suggested to enhance cooling performance.

关键词： baffle liquid-immersed thermoelectric performance lithium-ion battery battery thermal management

Polyvinyl alcohol fiber with enhanced strength and modulus and intense cyan fluorescence based on covalently functionalized graphene quantum dots

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Chinese Chemical Letters 2025年第2期36卷 250-255页

作者： Manman Ou Yunjian Zhu Jiahao Liu Zhaoxuan Liu Jianjun Wang jun Sun Chuanxiang Qin Lixing dai College of Chemistry Chemical Engineering and Materials Science Soochow University

In this study, we proposed a novel and efficient way to strengthen polyvinyl alcohol(PVA) fiber using graphene quantum dots(GQDs). PVA molecular chains were grafted onto the surface of GQDs through Friedel-Crafts alkylation reaction to obtain functionalized GQDs(f-GQDs), and PVA/f-GQDs composite fiber was successfully prepared by wet spinning and post-treatment. The tensile strength and Young's modulus of the composite fiber reached up to 1229.24 MPa and 35.36 GPa which were approximately twice and 4 times those of the pure PVA fiber, respectively. Moreover, the composite fiber was demonstrated excellent resistance to solvents. In addition, the PVA/f-GQDs composite fiber showed intense and uniform cyan fluorescence, meanwhile, it could maintain stable solid-state fluorescence in acid and alkali solutions and particularly after long-term immersion in water(1 month). This study proposes a promising route for obtaining high-performance conventional fibers with some new functions.

关键词： Enhancement Fluorescence Graphene quantum dots Polyvinyl alcohol fiber