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Highly ordered inkjet-printed quantum-dot thin films enable efficient and stable QLEDs with EQE exceeding 23%

escience 2024年第3期4卷 152-162页

作者： Changting Wei Bo Xu Meng Zhang Zhenhuang Su Jiawei Gu Wenrui Guo Xingyu Gao Wenming Su Zheng Cui Seokwoo Jeon Zhiyong Fan Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Ningbo Nato New Material Technology Co. LtdNingbo 315600China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China Printable Electronics Research Center Nano Devices and Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Materials Science and Engineering Korea UniversitySeoul 02841South Korea Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China

Inkjet-printed quantum dot light-emitting diodes(QLEDs)are emerging as a promising technology for next-generation ***,the progress in fabricating QLEDs using inkjet printing technique has been slower compared to spin-coated devices,particularly in terms of efficiency and *** key to achieving high performance QLEDs lies in creating a highly ordered and uniform inkjet-printed quantum dot(QD)thin *** this study,we present a highly effective strategy to significantly improve the quality of inkjet-printed CdZnSe/CdZnS/ZnS QD thin films through a pressure-assisted thermal annealing(PTA)*** from this PTA process,a high quality QD thin film with ordered packing,low surface roughness,high photoluminescence and excellent electrical property is *** mechanism behind the PTA process and its profound impact on device performance have been thoroughly investigated and ***,a record high external quantum efficiency(EQE)of 23.08%with an impressive operational lifetime(T50)of up to 343,342h@100cdm−2,and a record EQE of 22.43%with T50 exceeding to 1,500,463h@100cdm−2 are achieved in inkjet-printed red and green CdZnSe-based QLEDs,*** work highlights the PTA process as an important approach to realize highly efficient and stable inkjet-printed QLEDs,thus advancing QLED technology to practical applications.

关键词： Inkjet printing Quantum dot light-emitting diode High efficiency Thermal annealing Highly ordered

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Specular inverse Faraday effect in transition metals

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Physical Review materials 2023年第12期7卷 125202-125202页

作者： Victor H. Ortiz Shashi B. Mishra Luat Vuong Sinisa Coh Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside 92521 CA United States

The inverse Faraday effect is an optomagnetic phenomenon that describes the ability of circularly polarized light to induce magnetism in solids. The capability of light to control magnetic order in solid state materials and devices is of interest for a variety of applications, such as magnetic recording, quantum computation, and spintronic technologies. However, significant gaps in understanding about the effect persist, such as what material properties govern the magnitude of the effect in metals. In this work, we report time-resolved measurements of the specular inverse Faraday effect in nonmagnetic metals, i.e., the magneto-optic Kerr effect induced by circularly polarized light. We measure this specular inverse Faraday effect in Cu, Pd, Pt, W, Ta, and Au at a laser wavelength of 783 nm. For Ta and W, we investigate both α and β phases. We observe that excitation of these metals with circularly polarized light induces significant circular dichroism. This nonlinear magneto-optical response to circularly polarized light is an order of magnitude larger in α-W than other metals, e.g., Pt or Au, and is greater than nearly all other reported values for the inverse Faraday effect in other materials. Our results benchmark the range of the inverse Faraday effect that can be observed in nonmagnetic metals and provide insight into what material properties govern the inverse Faraday effect in metals.

关键词： Light-induced magnetic effects Magneto-optics Ultrafast optics Magneto-optical Kerr effect Sputtering Ultrafast femtosecond pump probe

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A Soft-Robotic Thumb Orthosis Facilitating Individual Assistance of Thumb Joints

A Soft-Robotic Thumb Orthosis Facilitating Individual Assist...

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IEEE International Conference on Soft Robotics (RoboSoft)

作者： Christina Chase-Markopoulou Anoush Sepehri Tania K. Morimoto Michael T. Tolley Department of Mechanical and Aerospace Engineering Department of Surgery Materials Science and Engineering Program University of California San Diego CA USA

ISBN: (数字)9798331520205

ISBN: (纸本)9798331520212

Many wearable soft robotic devices have been developed to assist with spasticity – the increased muscle tone seen in individuals with neurological conditions such as stroke or cerebral palsy. However, these devices typically lack the ability to individually assist multiple degrees of freedom (DOF), which is essential to performing a broad range of daily tasks. To address this need, we developed a soft robotic thumb orthosis to achieve movement in three DOF. We focused on the thumb as it performs the most complex movement. Our orthosis used three unfolding textile pneumatic actuators to assist with the extension of the interphalangeal joint, combined extension of the metacarpal and carpometacarpal joints, and abduction of the carpometacarpal joint. The orthosis was tested on both a 3D-printed biomimetic test bed that emulated spasticity and a healthy individual. The orthosis met the full range of motion targets for each joint, except for the abduction of the carpometacarpal joint with medium spasticity, and surpassed the range of motion threshold required for activities of daily living. The orthosis was able to: (1) assist each DOF independently, (2) move the tip of a biomimetic thumb to a pre-determined target with total error of less than 1.5 cm when actuated with open-loop control, and, (3) provide individual joint assistance to a user with no motor impairment. This research showcases the ability of a soft robotic orthosis to assist movement in simulated spasticity of individual thumb joints and provides an important step towards a platform to study whether independent joint assistance during rehabilitation improves patient outcomes.

关键词： Performance evaluation Pneumatic actuators Biomimetics Thumb Spasticity Soft robotics Muscles Motors Motion control Textiles

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Wear and corrosion-resistant Al2FeCrMnTixlaser cladding coatings - From powder production by high temperature remelting spheroidization to coating built-up by Laser Powder Bed Fusion

Wear and corrosion-resistant Al2FeCrMnTixlaser cladding coat...

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2024 International Conference on Corrosion Protection and Application, ICCPA 2024

作者： Liu, Jie Guo, Yongqiang Du, Kang Wang, Wei Fan, Chenjie Zhang, Wenqi He, Jiayu Guo, Hongmin Gu, Zhen State Key Laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'An Jiaotong University Xi'an710049 China The Third Gas Production Plant of Changqing Oilfield Branch of Petrochina Co. LTD Xi'an710018 China

High entropy alloys (HEAs) have unique mechanical and electrochemical properties in various of fields. Laser powder bed fusion (LPBF) is a prominent additive manufacturing process. It uses thermal energy to bind powder materials together to build plastic or metal parts. The technology has a remarkable effect on improving the corrosion resistance and wear resistance of the agitating blade coatings. However, the traditional gas atomization method (GA) often produce alloy powder (containing refractory element, such as Nb, W) with uneven composition, affecting the quality and performance of specimens. That is why innovative or opposite classical production powder methods are in demand for LPBF. It is worth noting the mechanical alloying - high temperature remelting spheroidization dual process (DP) method could overcome the limitation of high temperature alloying of HEA containing refractory elements and realizes solid alloying of insoluble elements. In this paper, high entropy alloy Al2FeCrMnTix (x=0.25,0.5,0.75,1) is designed by means of composition control. The experimental results show that Al2FeCrMnTix is a single phase solid solution BCC structure. With the increase of Ti content, the corrosion resistance of Al2FeCrMnTix HEA coatings were enhanced at a certain range in simulated saturated brine solution. When Ti=0.75, the self-corrosion voltage is -0.179V and the self-corrosion current is 5.764×10-6 mA·cm-2. All coatings offer better corrosion resistance than 316L stainless steel substrates. Particularly, the Al2FeCrMnTix HEA coating can greatly improve the microhardness and wear resistance of the material surface. The average microhardness value of HEA coating reaches up to the maximum (726 HV0.2) when Ti=1, which is about 3.6 times that of the base matrix (316L). These findings have clear implications for coatings used to protect surfaces. Overall, It is clear that Ti0.75 represents lower volume wear rates and smoother wear surfaces, demonstrating better corrosi

关键词： Corrosion resistance

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Elongation enhancement strategies for AISI 430 stainless steel welded joints: insights from molecular dynamics analysis

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Acta Mechanica Sinica 2025年第2期41卷 150-162页

作者： Gongbo Bian Feng Liu Tingting Zhang Mengting Ran Xiaoyan Xue Dinglu Wu Wenxian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Xi’an Seal Electronic Material Technology Co. Ltd.Xi’an 710000China College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan 030024China

AISI 430 ferritic stainless steel is popular in modern industry,while conventional welding methods with filler metals produce welded joints with tensile strength(586 MPa)and elongation(7.35%),which is insufficient to meet the growing engineering *** this work,the elongation of the joint is doubled(15.11%)while yield strength remains unchanged after post-weld heat treatment(PWHT).Microstructural analysis of heat affected zone(HAZ)reveals the transformation process between equiaxed ferrite,intergranular martensite,and intragranular acicular martensite in the welded joint at 750℃ and 800℃.Additionally,molecular dynamics simulations demonstrate the impact of various types of martensite on single crystals of ferritic stainless steel under *** results indicate that intergranular martensite and acicular martensite demonstrate transgranular fracture,while granular martensite exhibits intragranular *** martensite and granular martensite are distributed near high-strain regions within the crystal,whereas acicular martensite is concentrated at the grain boundaries,away from the high-strain *** comparison of hardening parameters for different types of martensite reveals that granular martensite(58.98)has higher ductility than acicular martensite(97.40)and intergranular martensite(111.54).These findings are valuable for developing advanced stainless steel welded joints that balance high ductility and strength,meeting modern engineering demands.

关键词： Welded joints Ductility enhancement AISI 430 ferritic stainless steel Post-weld heat treatment Molecular dynamics

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Electric Field-Induced Modulation of mechanical Behavior in Polyelectrolyte materials: A Multiscale Molecular Dynamics Study

SSRN

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SSRN 2024年

作者： Khan, M.D. Tahmid Anjum Pial, M.D. Turash Haque Motalab, Mohammad Department of Mechanical Engineering Bangladesh University of Engineering and Technology Dhaka1000 Bangladesh The Department of Material Science and Engineering Johns Hopkins University BaltimoreMD United States

Polymers with multifunctional capabilities are increasingly important for emerging technologies, particularly applications requiring electro-responsive behavior. Polyelectrolytes, which are charged polymers, hold promise for use in electrically triggered actuators, artificial muscles, biomedicine, and flexible electronics, where the modulation of mechanical properties is crucial for maintaining structural integrity and achieving functional goals. This study employs molecular dynamics simulations to explore how electric fields influence the mechanical properties of polyelectrolytes. The results show that applying an electric field enhances the stress-strain behavior of these materials. The investigation starts with a generic coarse-grained polyelectrolyte modeled using the Kremer-Grest polymer framework, followed by a detailed comparison with an all-atom model of a specific polyelectrolyte, namely polystyrene sulfonate combined with poly[2-(Methacryloyloxy)ethyl trimethylammonium chloride]. Both models demonstrate improved mechanical properties with increased strain rates, electric field strength, and duration of electric field application. Analysis reveals that the electric field induces orientation changes in the polyelectrolytes, enhancing attractive interactions among charged monomers. These findings highlight the potential of polyelectrolyte-based materials in advanced applications where electrical responsiveness is critical. © 2024, The Authors. All rights reserved.

关键词： Strain rate

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A Molecular Dynamic Study on the Prediction of Novel 2D Nanoadditive Performance in Palm Oil Methyl Ester (POME)-Based Lubricant

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Journal of Bio- and Tribo-Corrosion 2023年第4期9卷 1-12页

作者： Ruliandini, Rizky Mabuchi, Takuya Goncalves, William Rahman, Saidur Tokumasu, Takashi Nasruddin, Nasruddin Department of Mechanical Engineering Universitas Ibn Khaldun Bogor16162 Indonesia Institute of Fluid Science Tohoku University 2-1-1 Katahira Aoba-ku Miyagi Sendai980-8577 Japan Universite de Lyon INSA-Lyon MATEIS CNRS UMR 5510 Villeurbanne69621 France Research Center of for Nano-Material and Energy Technology Sunway University Selangor47500 Malaysia Department of Mechanical Engineering Universitas Indonesia Depok16424 Indonesia

The addition of nanoparticles to bio-lubricants enhances their thermal properties. However, the resulting instability in nanofluids, which contributes to increased friction, remains a common issue. The aggregation mechanism of nanoparticles in a base fluid has not been fully understood. This paper employs molecular dynamic simulation to predict the behavior of MXene in a palm oil methyl ester (POME)-based lubricant. This method introduces a new perspective in the field of POME with MXene, offering visualizations of MXene behavior in the oil that was previously unexplored. MXene with 2, 3, and 4 layers was inserted in POME molecules and simulated at a pressure of 1 atm and two temperatures, 313 K and 373 K. The behavior of MXene in POME was quantified using mean square displacement (MSD) and radial distribution function (RDF) graphs, which, respectively, reveal the diffusion coefficient value and the distribution pattern of MXene in POME. The results showed that the fluid with 3 layer MXene had the highest self-diffusion coefficient (D) and the greatest separation distance between the carbon atoms in each sheet. The study suggests that MXene tends to adhere in pairs due to the presence of strong interlayer coupling between MXene layers. This also explains why solutions with an odd number of MXene layers are more stable compared to solutions containing an even number of MXene layers. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Molecular dynamics

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Facile Preparation of NiO@graphene Nanocomposite with Superior Performances as Anode for Li-ion Batteries

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 212-222页

作者： Junke Ou Shugen Wu Lin Yang Hao Wang Institute for Advanced Study Chengdu UniversityChengdu 610106China Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong 643000China Zhanglan Honors College Chengdu UniversityChengdu 610106China School of Medicine Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Transition metal oxides gain considerable research attentions as potential anode materials for lithium ion batteries,but their applications are hindered due to their poor electronic conductivity,weak cycle stability and drastic volume ***,a NiO@graphene composite with a unique 3D conductive network structure is prepared through a simple *** applied as anode material for Li-ion batteries,at 50 mA g^(−1),the NiO@graphene displays a high reversible capacity of 1366 mAh g^(−1) and a stable cyclability of 205 mAh g^(−1) after 500 *** at a high rate of 10 A g^(−1),it displays a favorable reversible capacity of 711 mAh g^(−1).Remarkably,when it recovers back to 0.05 A g^(−1),a reversible capacity of 1741 mAh g^(−1) is ***,the NiO@graphene composite with 3D structure shows good application prospects as an alternative anode for advanced lithium ion batteries.

关键词： Lithium ion batteries 3D conductive network structure NiO@graphene composite Alternative

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Alkyl-thiophene-alkyl linkers to construct double-cable conjugated polymers for single-component organic solar cells

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Chinese Chemical Letters 2024年第1期35卷 542-546页

作者： Wenbin Lai Safakath Karuthedath Chengyi Xiao Lei Meng Frédéric Laquai Weiwei Li Yongfang Li Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China King Abdullah University of Science and Technology(KAUST) KAUST Solar Center(KSC)Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)Thuwal 23955-6900Kingdom of Saudi Arabia University of Chinese Academy of Sciences Beijing 100049China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

In this work,semirigid linkers of the alkyl-thiophene-alkyl structure are developed to construct double-cable *** alkyl units,propyl(C3H6),hexyl(C6H12),and dodecyl(C12H24),are applied as semirigid linkers,yielding three double-cable polymers:PBC6-T,PBC12-T,and PBC24-T,***12-T which uses C6H12-thiophene-C6H12 linkers is found to exhibit the best device efficiency of 5.56%,while PBC6-T and PBC24-T with shorter or longer linkers yield device efficiencies of only 2.65%and 1.09%in single-component organic solar cells(SCOSCs).Further studies reveal that PBC12-T exhibits higher crystallinity and improved charge transport,resulting in better *** work provides an approach to construct double-cable conjugated polymers with long alkyl linkers,and it shows the importance of the linker length for the photovoltaic performance of SCOSCs.

关键词： Double-cable conjugated polymer Single-component organic solar cell Crystallinity Semirigid linkers Alkyl-thiophene-alkyl

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Synthesis of Nano-Diamond Modified Ti3C2Tx Mxene Heterostructure Toward High-Efficiency Electromagnetic Wave Absorption

SSRN

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SSRN 2024年

作者： Tang, Qin Jiang, Hui Wu, Fa Shen, Jun State Key Laboratory of Mechanical Transmission College of Material Science and Engineering Chongqing University Chongqing400044 China

High-performance electromagnetic wave (EMW) absorbing materials are regarded as one effective approach to addressing electromagnetic radiation pollution. We synthesized a novel heterostructure 2D Ti3C2Tx MXene composite film modified by 0D nano-diamond particles via vacuum filtration method and investigated its microstructure and EMW absorption properties. ND modification regulated the impedance matching, reduced EMW interface reflection, and improved the diversity of losses, demonstrating excellent microwave absorption performance. At 10 mg ND content, the minimum reflection loss reached -51.0 dB, corresponding to 2.5 mm film thickness. This simple method opens new avenues for ND in EMW absorption and expands MXene-based absorbing materials design. © 2024, The Authors. All rights reserved.

关键词： Electromagnetic waves

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