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arXiv 2022年

作者： Herron, Lukas Sartori, Pablo Xue, BingKan Biophysics Program Institute for Physical Science and Technology University of Maryland College ParkMD United States Instituto Gulbenkian de Ciência Oeiras Portugal Department of Physics University of Florida GainesvilleFL United States

Many biological systems dynamically rearrange their components through a sequence of configurations in order to perform their functions. Such dynamic processes have been studied using network models that sequentially retrieve a set of stored patterns. Previous models of sequential retrieval belong to a general class in which the components of the system are controlled by a feedback ("input modulation"). In contrast, we introduce a new class of models in which the feedback modifies the interactions among the components ("interaction modulation"). We show that interaction modulation models are not only capable of retrieving dynamic sequences, but they do so more robustly than input modulation models. In particular, we find that modulation of symmetric interactions allows retrieval of patterns with different activity levels and has a much larger dynamic capacity. Our results suggest that interaction modulation may be a common principle underlying biological systems that show complex collective dynamics. © 2022, CC BY.

关键词： Feedback

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Engineering nanointerface of molybdenum-based heterostructures to boost the electrocatalytic hydrogen evolution reaction

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Journal of Energy Chemistry 2021年第7期30卷 370-376页

作者： Tong Liu Shuqing Zhou Jing Qi Kaiwen Wang Lirong Zheng Qingming Huang Tianhua Zhou Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710000ShaanxiChina Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Testing Center Fuzhou UniversityFuzhou 350116FujianChina

Rational heterostructure-design in electrocatalysts represents a promising approach toward high performance in the electrocatalytic hydrogen evolution reaction(HER).In specific,optimizing the H adsorption behavior at the surface/interface of heterostructure is of key importance to improve the catalytic ***,we demonstrate the construction of a heterostructure from a well-defined oxygenbridged Co/Mo heterometallic zeolitic imidazolate framework(MOZ) as an efficient electrocatalyst for *** optimized hybrid exhibits high catalytic activity and stability in electrolytes with a wide pH *** XPS,XAS and theoretical studies reveal that the regulation of metal species can tailor the lattice of Mo_(2)C within the hybrid and induce the formation of defect sites,which could not only induce surface charge transfer between the atoms and provide an additional active site,but also affect the H adsorption behavior at the interface of a *** work provides an effective strategy to design a heterostructure with tailored active sites for energy conversion.

关键词： Electrocatalysis Metal-organic framework Water splitting Heterostructure

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Hourglass Charge-Three Weyl Phonons

arXiv

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arXiv 2022年

作者： Wang, Xiaotian Zhou, Feng Zhang, Zeying Yu, Zhi-Ming Yao, Yugui School of Physical Science and Technology Southwest University Chongqing400715 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China

Unconventional Weyl point with nonlinear dispersion features higher topological charge |C| > 1 and multiple topologically protected Fermi arc states at its boundary. As a novel topological state, it has been attracting widespread attention. However, the unconventional Weyl point with |C| = 3 has not yet been reported in realistic materials, even though it has been theoretically proposed for more than a decade. In this work, based on first-principles calculations and theoretical analysis, we predict the existing material, α-LiIO3 as the first realistic example with this unconventional Weyl point. Specifically, in the phonon spectra of α-LiIO3, two Weyl points with C = −3, connected by time-reversal symmetry, appear at the neck crossing-point of an hourglass-type band, leading to two hourglass charge-3 Weyl phonons. The symmetry protection and the associated novel triple- and sextuple-helicoid surface arc states of the hourglass charge-3 Weyl phonons are revealed. Our results uncover a hidden topological character of α-LiIO3 and also show that the phonon spectra is a great platform for exploring unconventional topological states. © 2022, CC BY.

关键词： Phonons

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Prediction of Giant Tunneling Magnetoresistance in RuO2/TiO2/RuO2 (110) Antiferromagnetic Tunnel Junctions

arXiv

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arXiv 2023年

作者： Jiang, Yuan-Yuan Wang, Zi-An Samanta, Kartik Zhang, Shu-Hui Xiao, Rui-Chun Lu, W.J. Sun, Y.P. Tsymbal, Evgeny Y. Shao, Ding-Fu Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Department of Physics and Astronomy Nebraska Center for Materials and Nanoscience University of Nebraska LincolnNE68588-0299 United States College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Institute of Physical Science and Information Technology Anhui University Hefei230601 China High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei230031 China Collaborative Innovation Center of Microstructures Nanjing University Nanjing210093 China

Using first-principles quantum-transport calculations, we investigate spin-dependent electronic and transport properties of antiferromagnetic tunnel junctions (AFMTJs) that consist of (110)-oriented antiferromagnetic (AFM) metal RuO2 electrodes and an insulating TiO2 tunneling barrier. We predict the emergence of a giant tunneling magnetoresistance (TMR) effect in a wide energy window, a series of barrier layer thicknesses, and different interface terminations, indicating the robustness of this effect. We show that the predicted TMR cannot be explained in terms of the global transport spin-polarization of RuO2 (110) but is well understood based on matching the momentum-dependent spin-polarized conduction channels of the two RuO2 (110) electrodes. We predict oscillations of TMR with increasing barrier thickness, indicating a non-negligible contribution from the perfectly epitaxial interfaces. Our work helps the understanding of the physics of TMR in AFMTJs and aids in realizing efficient AFM spintronic devices. Copyright © 2023, The Authors. All rights reserved.

关键词： Tunnelling magnetoresistance

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Engineering grain boundaries in monolayer molybdenum disulfide for efficient water-ion separation

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science (New York, N.Y.) 2025年第6735期387卷 776-782页

作者： Shen, Jie Aljarb, Areej Cai, Yichen Liu, Xing Min, Jiacheng Wang, Yingge Wang, Qingxiao Zhang, Chenhui Chen, Cailing Hakami, Mariam Fu, Jui-Han Zhang, Hui Li, Guanxing Wang, Xiaoqian Chen, Zhuo Li, Jiaqiang Dong, Xinglong Shih, Kaimin Huang, Kuo-Wei Tung, Vincent Shi, Guosheng Pinnau, Ingo Li, Lain-Jong Han, Yu Physical Sciences and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Department of Physics King Abdulaziz University Jeddah Saudi Arabia KAUST Catalysis Center King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing China Shanghai Applied Radiation Institute Shanghai Key Laboratory of Atomic Control and Application of Inorganic 2D Supermaterials Shanghai University Shanghai China Department of Mechanical Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Department of Civil Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Imaging and Characterization Core Lab King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Department of Chemical System Engineering School of Engineering University of Tokyo Tokyo Japan Center for Electron Microscopy South China University of Technology Guangzhou China School of Emergent Soft Matter South China University of Technology Guangzhou China Catalyst Center of Excellence (CCoE) Research and Development Center Saudi Aramco Dhahran Saudi Arabia Center for Sustainability and Energy Technologies Chang Gung University Taoyuan Taiwan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai China University of Chinese Academy of Sciences Wenzhou China

Two-dimensional (2D) materials have long been considered as ideal platforms for developing separation membranes. However, it is difficult to generate uniform subnanometer pores over large areas on 2D materials. We report that the well-defined eight-membered ring (8-MR) pores, typically formed at the boundaries of two antiparallel grains of monolayer molybdenum disulfide (MoS2), can serve as molecular sieves for efficient water-ion separation. The density of grain boundaries and, consequently, the number of 8-MR pores can be tuned by regulating the grain size. Optimized MoS2 membranes outperformed the state-of-the-art membranes in forward osmosis tests by demonstrating both ultrahigh water/sodium chloride selectivity and exceptional water permeance. Creating precise pore structures on atomically thin films through grain boundary engineering presents a promising route for producing membranes suitable for various applications.

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Strong, Mid-IR Driven THz Generation for Nonlinear Spectroscopy

Strong, Mid-IR Driven THz Generation for Nonlinear Spectrosc...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Claudia Gollner Rokas Jutas Dominik Kreil Dmitry N. Dirin Simon C. Boehme Andrius Baltuška Maksym V. Kovalenko Anastasios D. Koulouklidis Vladimir Yu. Fedorov Stelios Tzortzakis Mostafa Shalaby Audrius Pugžlys SLAC National Accelerator Laboratory Stanford Institute for Materials & Energy Sciences Menlo Park CA United States Photonics Institute TU Wien Wien Austria Institute for Theoretical Physics Johannes Kepler University Linz Austria Department of Chemistry and Applied Biosciences Institute of Inorganic Chemistry ETH Zürich Zürich Switzerland Empa-Swiss Federal Laboratories for Materials Science and Technology Dübendorf 12 Switzerland Center for Physical Sciences & Technology Vilnius Lithuania Institute of Electronic Structure and Laser (IESL) Foundation for Research and Technology - Hellas (FORTH) Heraklion Greece Science Program Texas A&M University at Qatar Doha Qatar P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow Russia Department of Materials Science and Technology University of Crete Heraklion Greece Techpark Swiss Terahertz Research-Zurich Zurich Switzerland Key Laboratory of Terahertz Optoelectronics Beijing Advnaced Innovation Center of Imaging Technology CNU Bejing China

We report on strong-field THz sources from optical rectification in organic crystals or two-color plasma filaments, driven by intense mid-IR pulses. Non-linear perturbation of semiconductor materials is demonstrated b... 详细信息

ISBN: (纸本)9798350369311

关键词： Spectroscopy Semiconductor materials Semiconductor lasers Perturbation methods Lasers and electrooptics Plasmas Transient analysis Nonlinear optics Electro-optical waveguides Optical pulses

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Polystyrene Shell-Based "Coconut-Like" and "Pomegranate-Like" Microencapsulated Phase Change Materials: Formation Mechanism, Thermal Conductivity/Stability Enhancement and Their Application in Thermal Management

SSRN

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SSRN 2024年

作者： Zhang, Wei Pan, Rui Yang, Jihua Liu, Mengru Yao, Yunle Zhang, Awang Gong, Yi Gan, Zhengya Hu, Rui Ding, Jianjun Chen, Lin Zhang, Xian Xue, Meng Tian, Xingyou University of Science and Technology of China Anhui Hefei230026 China Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Anhui Hefei230031 China School of Chemistry and Chemical Engineering Anhui University Hefei230601 China Guangdong Banggu Film Coatings Innovation Academy Co Ltd Nanxiong S12400 China

Encapsulation of phase change materials (PCMs) using polystyrene (PS) can be an effective solution to the leakage of PCMs, but the low thermal conductivity/stability of the prepared microencapsulated phase change materials (MEPCMs) remain unresolved. Here, we investigated the formation mechanism of PS shell-based MEPCMs via Pickering emulsion polymerization: coconut-like and pomegranate-like MEPCMs were obtained for the first time before and after the introduction of divinylbenzene (DVB), and the thermal conductivity and stability of the former were lower than that of the latter with the same graphene nanosheets (GNSs). Among them, MEPCM-4-7 wt % GNSs (St:DVB=1:1) has the highest thermal conductivity of 0.9358 W∙m-1∙k-1 (222.46 % higher than MEPCM without GNS), and the thermal stability is slightly weaker than MEPCM-3-7 wt % GNSs (St:DVB=5:1). The phase change composites (PCCs) was prepared by dispersing MEPCMs in PDMS matrix and applied to the simulated chip thermal management, which can achieve a 10.85% decrease in the chip equilibrium temperature compared with PDMS. The method of improving the heat transfer properties and thermal stability of MEPCMs based on their structure provides a new idea to solve the problem of low thermal conductivity and stability of MEPCMs, and the prepared PCCs show great potential in practical applications. © 2024, The Authors. All rights reserved.

关键词： Polystyrenes

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SSRN

引用

SSRN 2024年

Encapsulation of phase change materials (PCMs) using polystyrene (PS) can be an effective solution to the leakage of PCMs, but the low thermal conductivity/stability of the prepared microencapsulated phase change materials (MEPCMs) remain unresolved. Here, we investigated the formation mechanism of PS shell-based MEPCMs via Pickering emulsion polymerization: coconut-like and pomegranate-like MEPCMs were obtained for the first time before and after the introduction of divinylbenzene (DVB), and the thermal conductivity and stability of the former were lower than that of the latter with the same graphene nanosheets (GNSs). Among them, MEPCM-4-7 wt % GNSs (St:DVB=1:1) has the highest thermal conductivity of 0.9358 W∙m-1∙k-1 (222.46% higher than MEPCM without GNS), and the thermal stability is slightly weaker than MEPCM-3-7 wt % GNSs (St:DVB=5:1). The phase change composites (PCCs) was prepared by dispersing MEPCMs in PDMS matrix and applied to the simulated chip thermal management, which can achieve a 10.85% decrease in the chip equilibrium temperature compared with PDMS. The method of improving the heat transfer properties and thermal stability of MEPCMs based on their structure provides a new idea to solve the problem of low thermal conductivity/stability of MEPCMs, and the prepared PCCs show great potential in practical applications. © 2024, The Authors. All rights reserved.

关键词： Polystyrenes

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The issues on the commercialization of perovskite solar cells

材料展望（英文）

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材料展望（英文） 2024年第2期3卷 118-152页

作者： Lixiu Zhang Yousheng Wang Xiangchuan Meng Jia Zhang Pengfei Wu Min Wang Fengren Cao Chunhao Chen Zhaokui Wang Fu Yang Xiaodong Li Yu Zou Xi Jin Yan Jiang Hengyue Li Yucheng Liu Tongle Bu Buyi Yan Yaowen Li Junfeng Fang Lixin Xiao Junliang Yang Fuzhi Huang Shengzhong Liu Jizhong Yao Liangsheng Liao Liang Li Fei Zhang Yiqiang Zhan Yiwang Chen Yaohua Mai Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People's Republic of China Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632People's Republic of China Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031People's Republic of China Institute of optoelectronics Fudan UniversityShanghai 200433People's Republic of China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072People's Republic of China School of Physical Science and Technology Soochow UniversitySuzhou 215006People's Republic of China Institute of Functional Nano & Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People's Republic of China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123People's Republic of China School of Physics and Electronic Science East China Normal UniversityShanghai 200241People's Republic of China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871People's Republic of China College of Biophotonics South China Normal UniversityGuangzhou 510631People's Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People's Republic of China School of Physics and Electronics Central South UniversityChangsha 410083People's Republic of China School of Materials Science and Engineering Shaanxi Normal UniversityXi'an 710119People's Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People's Republic of China Microquanta semiconductor Hangzhou 311121People's Republic of China School of Information Science and Technology Fudan UniversityShanghai 200433People's Republic of China

Perovskite solar cells have aroused a worldwide research upsurge in recent years due to their soaring photovoltaic performance,ease of solution processing,and low *** power conversion efficiency record is constantly being broken and has recently reached 26.1％in the lab,which is comparable to the established photovoltaic technologies such as crystalline silicon,copper indium gallium selenide and cadmium telluride(CdTe)solar ***,perovskite solar cells are standing at the entrance of industrialization,where huge opportunities and risks ***,towards commercialization,challenges of up-scaling,stability and lead toxicity still remain,the proper handling of which could potentially lead to the widespread adoption of perovskite solar cells as a low-cost and efficient source of renewable *** review gives a holistic analysis of the path towards commercialization for perovskite solar cells.A comprehensive overview of the current state-of-the-art level for perovskite solar cells and modules will be introduced first,with respect to the module efficiency,stability and current status of *** will then discuss the challenges that get in the way of commercialization and the corresponding strategies to address them,involving the upscaling,the stability and the lead toxicity *** into the future direction of commercialization of perovskite photovoltaics was also provided,including the flexible perovskite cells and modules and perovskite indoor ***,the future perspectives towards commercialization are put forward.

关键词： commercializations perovskite solar cells state-of-the-art level challenges and perspectives indoor photovoltaics

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Effect of metakaolin and fly ash on the early hydration and pore structure of Portland cement

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Cement and Concrete Research 2025年 196卷

作者： Papp, Vanda Ardelean, Ioan Bulátkó, Anna László, Krisztina Csík, Attila Janovics, Róbert Kéri, Mónika University of Debrecen Department of Physical Chemistry Egyetem tér 1 DebrecenH-4032 Hungary Isotoptech Zrt. DebrecenH-4026 Hungary Technical University of Cluj-Napoca Department of Physics and Chemistry Cluj-Napoca400114 Romania Department of Physical Chemistry and Materials Science Faculty of Chemical Technology and Biotechnology Budapest University of Technology and Economics PO Box 91 BudapestH-1521 Hungary HUN-REN Institute for Nuclear Research Bem tér 18/C DebrecenH-4026 Hungary

Substituting cement with pozzolans is important for various applications, like radioactive waste management. In this study, 10–30 % metakaolin and fly ash were added to Portland cement to gain insight into their effects on the structure formation, pore structure, and surface properties of cement. Early hydration of these composites was monitored using NMR relaxometry, showing that metakaolin exhibited pozzolanic activity after 8 h, while filler effect was observed for fly ash. FFC NMR and T1-T2 correlation relaxometry revealed stronger water-solid interaction for the composites compared to pure cement. The dominance of the CSH gel pores increased with the additives in dry and wet state. Water diffusion in the capillary pores, followed by H2O-D2O exchange, was slower in metakaolin composites than in fly ash containing samples. The novel combination of NMR, SEM and N2 porosimetry showed an advantage of metakaolin additive over fly ash for the long-term safe disposal of radioactive waste. © 2025 The Authors

关键词： Portland cement

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