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Design and tailoring of patterned ZnO nanostructures for perovskite light absorption modulation

International Journal of Minerals,Metallurgy and materials 2024年第5期31卷 855-861页

作者： Haonan Si Xuan Zhao Qingliang Liao Yue Zhang Academy for Advanced Interdisciplinary Science and Technology Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of EducationBeijing Key Laboratory for Advanced Energy Materials and TechnologiesSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Lithography is a pivotal micro/nanomanufacturing technique,facilitating performance enhancements in an extensive array of devices,encompassing sensors,transistors,and photovoltaic *** key to creating highly precise,multiscale-distributed patterned structures is the precise control of the lithography ***,high-quality patterned ZnO nanostructures are constructed by systematically tuning the exposure and development times during *** optimizing these parameters,ZnO nanorod arrays with line/hole arrangements are successfully *** ZnO nanostructures with highly controllable morphology and structure possess discrete three-dimensional space structure,enlarged surface area,and improved light capture ability,which achieve highly efficient energy conversion in perovskite solar *** lithography process management for these patterned ZnO nanostructures provides important guidance for the design and construction of complex nanostructures and devices with excellent performance.

关键词： lithography patterned ZnO nanorod arrays light absorption perovskite solar cell

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A novel high-efficient P/N/Si-containing APP-based flame retardant with a silane coupling agent in its molecular structure for epoxy resin

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Chinese Journal of Chemical engineering 2023年第3期55卷 137-147页

作者： Qiang Sun Jinlei Wang Xue Meng Jie Zhang Hong Yan College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials(Taiyuan University of Technology) Ministry of EducationTaiyuan 030024China

A flame retardant containing multiple antiflaming elements usually exhibits high-efficient flame retardancy. Here, a novel P/N/Si-containing ammonium polyphosphate derivative(APTES-APP) is synthesized from ammonium polyphosphate(APP) and silane coupling agent(3-aminopropyl)triethoxysilane(APTES)via cation exchange, which is quite different in the chemical structure from APTES-modified APP for retaining silicon hydroxyls. APTES-APP is highly efficient for the epoxy resin. 8%(mass) APTES-APP imparts excellent flame retardancy to the epoxy resin, with a V-0 rating at the UL-94 test(1.6 mm)and an LOI value of 26%(vol). The peak heat release rate and total smoke production of the flameretardant epoxy resin are decreased by 68.1% and 31.3%, respectively. The synergy of P/N/Si contributes to the well-expanded char residue with a strong and dense surface layer, which is a very good barrier against heat and mass transfer. Besides, there is no significant deterioration in the mechanical properties of flame-retardant epoxy resin thanks to silicon hydroxyls forming hydrogen bonds with epoxy molecules. Meanwhile, other molecules can be grafted onto APTES-APP via these silicon hydroxyls, if ***, this work has developed a new strategy for amino silane as flame retardants. In conjunction with a low-cost and simple preparation method, APTES-APP has a promising prospect in the high-performance flame-retardant epoxy.

关键词： Ammonium polyphosphate Silane coupling agent All-in-one system Flame retardancy Epoxy resin

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Emerging applicability of two-dimensional boron for energy catalysis

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Journal of Zhejiang University-science A(Applied Physics & engineering) 2024年第10期25卷 877-888页

作者： Dake ZHANG Chengcheng ZHANG Shenghua WANG Wei SUN State Key Laboratory of Silicon Materials and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Due to their unique physical and chemical properties,two-dimensional(2D)boron nanosheets have received tremendous research attention and demonstrated substantial value in electronic devices,biomedicine,and energy *** the preparation of boron nanosheets,compared with the bottom-up synthesis predominantly employed for electronics,the top-down synthesis route offers more facile and scalable *** this mini-review,we mainly discuss the recent advances in the synthesis of boron nanosheets using the top-down strategy and the relevant applications in energy ***,inspired by our recent works on the novel applications of 2D silicon,we put forward prospects for designing boron nanosheets,providing insights into developing viable techniques for high-performance heterogeneous catalysis.

关键词： Two-dimensional(2D)boron nanosheets Top-down method Catalytic applications

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Hybrid pseudocapacitance/co-intercalation mechanisms of TiO_(2)/graphite anodes for rapid sodium-ion storage

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Rare Metals 2024年第10期43卷 5427-5434页

作者： Ze-Rui Yan Da-Fu Tang Bin-Hao Wang Xiao-Juan Huang Xia Zou Si-Cheng Fan Yan Wu Tong Shu Qiu-Long Wei Department of Materials Science and Engineering College of MaterialsFujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsXiamen UniversityXiamen 361005China

Developing anode materials with high specific/volumetric capacities,high-rate capability,long-term cycles and low cost is significant for advanced sodium-ion ***,we report the hybrid TiO_(2)/graphite(TiO_(2)/G)anodes for fast(dis)charging sodium-ion *** advantage of the rapid pseudocapacitive surface-redox on anatase TiO_(2)nanoparticles(NPs)and fast[Na(diglyme)_(x)]^(+)co-intercalation into graphite,the hybrid anodes display excellent rate ***,the TiO_(2)NPs are able to fill into the interspaces among graphite flakes and the graphite provides continuous electron pathways,which largely boosts the volumetric capacities and rate performance.

关键词： boost intercalation capacitance

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Synergistic Enhancement of Mechanical Properties and Electrical Conductivity of Immiscible Bimetal:A Case Study on W–Cu

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engineering 2025年第3期46卷 224-235页

作者： Qixiang Duan Chao Hou Tielong Han Yurong Li Haibin Wang Xiaoyan Song Zuoren Nie Key Laboratory of Advanced Functional Materials Ministry of EducationCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Immiscible bimetal systems,of which tungsten–copper(W–Cu)is a typical representative,have crucial applications in fields requiring both mechanical and physical ***,it is a major challenge to determine how to give full play to the advantages of the two phases of the bimetal and achieve outstanding comprehensive *** this study,an ultrafine-grained W–Cu bimetal with spatially connected Cu and specific Wislands was fabricated through a designed powder-mixing process and subsequent rapid low-temperature *** prepared bimetal concurrently has a high yield strength,large plastic strain,and high electrical *** stress distribution and strain response of individual phases in different types of W–Cu bimetals under loading were quantified by means of a *** high yield strength of the reported bimetal results from the microstructure refinement and high contiguity of the grains in the W islands,which enhance the contribution of W to the total plastic deformation of the *** high electrical conductivity is attributed to the increased mean free path of the Cu and the reduced proportion of phase boundaries due to the specific phase combination of W islands and *** work provides new insight into modulating phase configuration in immiscible metallic composites to achieve high-level multi-objective properties.

关键词： Immiscible bimetal Phase configuration Mechanical property Electrical conductivity Strain response

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Insight into the Solution Self-Assembly of Amphiphilic Asymmetric Brush Copolymers via Computer Simulations

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Chinese Journal of Polymer science 2025年第1期43卷 132-140,I0010页

作者： Wei-Ting Zeng Wei-Sheng Feng Xing Zhang Yuan Yao Bin-Bin Xu Shao-Liang Lin Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of EducationFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China

Amphiphilic asymmetric brush copolymers(AABCs)possess unique self-assembly behaviors owing to their asymmetric brush architecture and multiple functionalities of multicomponent side ***,the synthesis of AABCs presents challenges,which greatly limits the exploration of their self-assembly *** this work,we employed dissipative particle dynamics(DPD)simulations to investigate the self-assembly behaviors of AABCs in selective *** varying the copolymer concentration and structure,we conducted the self-assembly phase diagrams of AABCs,revealing complex morphologies such as channelized micelles with one or more solvophilic ***,the number,surface area,and one-dimensional density distribution of the channelized micelles were calculated to demonstrate the internal structure and morphological transformation during the self-assembly *** findings indicate that the morphology of the internal solvophilic channels is greatly influenced by the copolymer structure,concentration,and interaction parameters between the different side *** simulation results are consistent with available experimental observations,which can offer theoretical insights into the self-assembly of AABCs.

关键词： Dissipative particle dynamics Brush copolymer Self-assembly Channelized micelle

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Low-temperature rapid sintering for the fabrication of biphasic Si3N4 ceramics with outstanding mechanical properties

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Journal of advanced Ceramics 2025年第3期14卷 143-150页

作者： Shuo Zhao Songmo Du Shijia Zhang Dengke Zhao Binbin Fan Bohan Wang Fei Li Kexin Chen Guanghua Liu State Key Laboratory of New Ceramic Materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The fabrication of Si3N4 ceramics typically requires high temperatures(above 1700℃)and prolonged sintering time to achieve densification,resulting in high energy consumption and increased manufacturing ***,reports on the fabrication of dense Si3N4 ceramics with good mechanical properties under MPa-level pressure and low temperatures are *** this work,we propose a low-temperature rapid spark plasma sintering strategy involving the introduction of fine-grainedβ-Si3N4 powder with high lattice strain energy as an“additive”.Dense biphasic Si3N4 ceramics,predominantlyα-Si3N4,were successfully fabricated at a mechanical pressure of 200 MPa and a temperature of 1300℃,achieving a relative density of 97%.The application of high pressure promoted particle rearrangement and uniform liquid‒phase distribution,providing additional driving forces for *** introduction ofβ-Si3N4 seeds facilitated an in-situ solution–reprecipitation process,enabling rapid densification with a minimal liquid phase and without significant grain growth,resulting in nanometer-scale *** Si3N4 sample prepared at 1350℃ exhibited a desirable combination of high hardness(18.5±0.3 GPa)and fracture toughness(6.7±0.2 MPa·m_(1/2)).The results demonstrate that by adjusting the sintering temperature and time,the phase composition and mechanical properties of the ceramics can be flexibly *** work holds significant potential for industrial manufacturing and provides valuable insights into low-temperature strategies for ceramic fabrication.

关键词： low temperature sintering silicon nitride β-Si3N4 seeds spark plasma sintering(SPS)

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Understanding Broad Polydispersity in Step-growth Polymerization via Catalyst Competition Mechanism

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Chinese Journal of Polymer science 2024年第12期42卷 1897-1904,I0007页

作者： Donglai Tian Jie Wang Xiaohua Huang Yun Ding Aiguo Hu Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and EngineeringEast China University of Science and Technology Shanghai 200237China

Conjugated polymers are mainly synthesized by cross-coupling polymerizations catalyzed with transition metal(Pd,Ni)catalysts through step-growth polymerization(SGP)*** to the classical theory of SGP,the polymer dispersion index(D)of the synthesized polymers will never be higher than ***,the cases where conjugated polymers synthesized with D value far exceeding 2 are very common in reality,which severely limits their processing property,performance and *** investigate the reason behind the D value deviation from the theoretical value of SGP,direct arylation polycondensation(DArP)of 2-bromo-3-hexylthiophene(3HT)was chosen as the model reaction,and the reaction process was tracked using gel permeation chromatography *** Pd(OAc)_(2) was used as the catalyst,the D value linearly increased with the increase of the weight-average molecular weight(M_(w))of polymer(P3HT)after a short period and reached up to 7.2 at prolonged reaction *** transmission electron microscopic images of the reaction mixture showed the fibril-like aggregation of P3HT and assembling of Pd species in P3HT aggregates.A catalyst competition mechanism was thus proposed,together with numerical calculation,giving a good fitting to the experimental results,which is believed to have far-reaching significance for guiding the design,synthesis and processing of conjugated polymers.

关键词： Step-growth polymerization Conjugated polymer Polymer dispersion index Catalyst competition mechanism

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Computational study of the effect of friction coefficients and particle shape on the repose angle and porosity of sinter piles

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Particuology 2025年第3期98卷 231-240页

作者： Meng Li Yaowei Yu Henrik Saxén Process and Systems Engineering Laboratory Faculty of Science and EngineeringÅbo Akademi University20500TurkuFinland State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai University200444ShanghaiChina

Shape has an undeniable impact on particle behaviour,and the shapes of naturally occurring granular matter are typically *** studies of irregularly shaped particles are challenging but necessary to gain a better understanding of the flow of particulate *** study focuses on the behaviour of irregular sinter particles and applies the discrete element method to examine the effects of static and rolling friction coefficients and particle shape on the angle of repose and porosity of sinter piles.A three-dimensional model of an irregular sinter particle reconstructed by close-range photogrammetry served as the template for generating multi-sphere particles with varying numbers of sub-spheres(1,3,7,22,and 135)and sphericity ranging from 1 to *** of particle piles were conducted for a range of values of the coefficients of static and rolling *** results indicate that the angle of repose increases with static friction and also increases with rolling friction coefficient when it is lower than the static *** angle of repose shows clear dependence on particle shape,particularly for lower rolling friction *** friction coefficients for particles of five different shapes were individually determined through bulk calibration,and irregularly shaped particles in DEM were found to require lower friction *** was marginally affected by the static and rolling friction coefficients for spherical particles,while non-spherical particles showed porosity increasing with the rolling friction *** relationship between particle sphericity and porosity was nonlinear:as sphericity decreases from 1.00 to 0.69,the porosity first decreases to a minimum and then *** findings confirmed that both friction and particle shape have a significant influence on the structure of sinter piles,with implications for material handling and processing in industrial applications.

关键词： Sinter Discrete element method Friction coefficients Particle shape Repose angle Porosity

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Biomimetic bilayer ionic conductive photoelectronic skin based on nano-structured photonic crystal film and flexible adhesive hydrogel for dual-signal motion detection and anti-disturbance temperature monitor

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Journal of materials science & Technology 2024年第25期192卷 149-160页

作者： Tengyu Long Weizhong Yuan School of Materials Science and Engineering Key Laboratory of Advanced Civil Materials of Ministry of EducationTongji UniversityShanghai 201804China

The growing interest in biological skin mimicry has greatly contributed to the creation of high-performance artificial ***,inspired by the optical-electrical signal co-transmission of chameleon skins,a bilayer biomimetic ion-conductive photoelectronic skin(BIPES)was constructed by compositing the mechanochromic nano-structured silica photonic crystal film with an adhesive,flexible hydrogel by a layer-by-layer design *** BIPES has a highly sensitive strain response on electrical and optical signals(GF=3.27 at 0-100%,△λ/△ε=2.1 nm%^(-1))and temperature response(TCR=-2.27%℃^(-1)at 0-50℃).Importantly,through the temperature insensitivity of the mechanochromic film,the BIPES not only achieved dual-signal motion detection but also achieved real-time temperature monitoring excluding strain *** research provides new inspiration for the construction of multi-signal combined photoelectronic skins and further exploration for advanced accurate smart wearable electronics in appli-cations,especially in health detection for patients with non-spontaneous body-trembling.

关键词： Photonic crystal film Photoelectronic skin Bilayer ionic conductive Dual-signal motion detection Anti-disturbance temperature monitor

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