检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Wu, Hui Wang, Lin Lou, Hengyi Wan, Junmin Pu, Xiong National Engineering Lab of Textile Fiber Materials & Processing Technology Zhejiang Sci-Tech University Hangzhou310018 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China Key Laboratory of Advanced Textile Materials and Manufacturing Technology

High-strength, highly conductive, and stretchable conductive fibers are essential for the development of flexible electronic devices. Here, we develop a continuous coaxial wet-spinning method to fabricate stretchable, conductive, and freeze-resistant hydrogel fibers with a core-sheath structure. The core is a supramolecular hydrogel, poly (APhe-AAm) (PAA), obtained by radical polymerization of acrylamide (AAm) and acryloyl-L-phenylalanine (APhe), and the sheath consists of PVDF-HFP and PU with hydrochloric acid as the coagulation bath. The hydrogel fibers exhibit excellent mechanical properties with a tensile strength of 3.1 MPa and elongation at a break of 750% due to the abundant multi-hydrogen bonding interactions. Hydrochloric acid plays two roles in this system: one is to promote hydrogen bond formation and improves mechanical properties, and the other is to provide plentiful ions to confer excellent electrical conductivity (10.59 S m-1) and freezing resistance (-20 oC). The application of fiber strain sensors for detecting human motion and pressure sensing demonstrates great potential as wearable electronic devices. © 2022, The Authors. All rights reserved.

关键词： Temperature

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Optical Modelling Of Gaas/Gasb Core-Shell Cone Topped Octagonal Faced Nanopillar Array With Periodic Trapezoidal Textured Cut For High Photon Trapping Efficiency

Research Square

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Research Square 2021年

作者： Baruah, Smriti Borah, Janmoni Bora, Joyatri Maity, Santanu Department of Electronics and Communication Engineering Madanapalle Institute of Technology and Science Madanapalle India Department of Electronics and Communication Engineering North Eastern Regional Institute of Science and Technology Nirjuli India School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

Proficiency in light reflectance mitigation is the most crucial factor for high photodetector *** this respect light trapping mechanism based on nanostructures or microstructures such as nanopillars,nanocones,nanopyramids have emerged as the most promising candidate for reducing overall light reflectance. This could be attributed to its effective large irradiation area, multiple scattering of incident light as well as increased path length of incident rays in these *** paper proposes an optical modelling of a GaAs/GaSb material based vertically oriented core-shell cone topped octagonal shaped nanopillar structure with periodical trapezoidal nanotexturization over it to be deployed over a circular planar detector’s surface of radius *** geometrical analytical investigation of the proposed model exhibits a 0.999 overall absorbance and 0.995A/W photoresponsivity along with 87% EQE at 1um operating wavelength. © 2021, CC BY.

关键词： Reflection

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Magneto-active composites with locally tailored stiffness produced by laser powder bed fusion

arXiv

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arXiv 2023年

作者： Schäfer, Kilian Lutzi, Matthias Khan, Muhammad Bilal Schäfer, Lukas Dirba, Imants Bruns, Sebastian Valizadeh, Iman Weeger, Oliver Hartmann, Claas Kupnik, Mario Adabifiroozjaei, Esmaeil Molina-Luna, Leopoldo Skokov, Konstantin Gutfleisch, Oliver Institute of Materials Science Technical University Darmstadt Darmstadt64287 Germany Physical Metallurgy Institute of Materials Science Technical University Darmstadt Darmstadt64287 Germany Cyber-Physical Simulation Group Technical University of Darmstadt Dolivostr. 15 Hessen Darmstadt64293 Germany Measurement and Sensor Technology Group Technical University Darmstadt Darmstadt64289 Germany Advanced Electron Microscopy Institute of Material Science Technical University of Darmstadt Darmstadt64287 Germany Additive Manufacturing Center Technical University Darmstadt Darmstadt64289 Germany

Additive manufacturing technologies enable the production of complex and bioinspired shapes using magneto-responsive materials, which find diverse applications in soft robotics. Particularly, the development of composites with controlled gradients in mechanical properties offers new prospects for advancements in magneto-active materials. However, achieving such composites with gradients typically involves complex multi-material printing procedures. In this study, a single-step laser powder bed fusion (LPBF) process is proposed that enables precise local adjustments of the mechanical stiffness within magneto-active composites. By utilizing distinct laser parameters in specific regions of a composite containing thermoplastic polyurethane and atomized magnetic powder derived from hard magnetic Nd-Fe-B, the stiffness of the composite can be modified within the range of 2 to 22 MPa. Various magneto-responsive actuators with locally tailored stiffness are fabricated and their magnetic performance is investigated. The enhanced response exhibited by actuators with locally adjusted mechanical properties in comparison to their homogeneous counterparts with identical geometries is shown. As a demonstration of biomedical application, a magnetically responsive stent with localized adjustment is presented with the ability to meet specific requirements in terms of geometry and local stiffness based on an individual's anatomy and disease condition. The proposed method presents an approach for creating functionally graded materials using LPBF, not only for magneto-active materials but also for several other structural and functional materials. © 2023, CC BY-NC-ND.

关键词： Magnetos

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Generating Bell states and Werner states of two qubits via optical field

arXiv

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arXiv 2024年

作者： Jiang, Dengkui Zhai, Cuilu Song, Yaju Peng, Zhaohui Yuan, Jibing Tang, Shiqing Lu, Wangjun Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Department of Maths and Physics Hunan Institute of Engineering Xiangtan411104 China College of Physics and Electronic Engineering Hengyang Normal University Hengyang421002 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials Department of Physics Hunan University of Science and Technology Xiangtan411201 China

In this paper, we investigate how the evolution of the states of two qubits initially in a direct product state can be controlled by the optical field in a Tavis-Cummings (TC) model. For the two qubits initially in the direct product state, we find that their matrix elements at any moment can be modulated by the coefficients of the optical field initial states in the number state space. We propose a method for preparing an X-type state of two qubits. Subsequently, for descriptive convenience, we divide the Bell states of the two qubits into two kinds in the paper. When both qubits are initially in the ground state, we find that the two qubits can be controlled to produce the first type of Bell state by the superposition state optical field that is initially in the next-nearest-neighbor number state and that the production of any of the first type of Bell states can be controlled by controlling the phase between the two next-nearest-neighbor number states. When one of the two qubits is in the ground state, and the other is in the excited state, we can control the two qubits to produce the second type of Bell state by the single-photon number state optical field. Finally, we study the generation of Werner states by controlling two qubits initially, both in the ground state, using an optical field. © 2024, CC BY.

关键词： Ground state

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Electrically driven motion, destruction, and chirality change of polar vortices in oxide superlattices

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Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 77-84页

作者： Pan Chen Congbing Tan Zhexin Jiang Peng Gao Yuanwei Sun Lifen Wang Xiaomei Li Ruixue Zhu Lei Liao Xu Hou Ke Qu Ning Li Xiaomin Li Zhi Xu Kaihui Liu Wenlong Wang Jinbin Wang Xiaoping Ouyang Xiangli Zhong Jie Wang Xuedong Bai Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China International Center for Quantum Materials Electron Microscopy LaboratorySchool of PhysicsPeking UniversityBeijing 100871China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Collaborative Innovation Center of Quantum Matter Beijing 100871China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China State Key Laboratory for Artificial Microstructure&Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang UniversityHangzhou 310027China

Topological polar vortices, which are electric analogs of magnetic objects, present great potential in applications of future nanoelectronics because of their nanometer size, anomalous dielectric response, and chirality. To enable the functionalities, it is prerequisite to manipulate the polar states and chirality by using external stimuli. Here, we probe the evolutions of polar state and chirality evolutions of topological polar vortices in Pb TiO;/Sr TiO;superlattices under an electric field by using atomically resolved in situ scanning transmission electron microscopy and phase-field simulations. We find that, under electric field, the chiral vortex cores can be moved laterally to form close-pair structures, transform into a/c domain stripes, and finally become a nonchiral c-domain. Such transition is reversible and spontaneous after bias removal. Interestingly, during switching and backswitching events, the vortex rotation can be changed, offering a potential strategy to manipulate vortex chirality. The revealed dynamic behavior of individual polar vortices at the atomic scale provides fundamentals for future device applications.

关键词： chirality polar vortex ferroelectrics in situ transmission electron microscopy phase-field simulations

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Reduced CoNi2S4 nanosheets decorated by sulfur vacancies with enhanced electrochemical performance for asymmetric supercapacitors

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Science China Materials 2020年第7期63卷 1216-1226页

作者： Yanpeng Liu Yuxiang Wen Yanan Zhang Xiaogang Wu Haoqian Li Hangda Chen Juanjuan Huang Guohan Liu Shanglong Peng National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Institute of Sensor Technology Gansu Academy of SciencesLanzhou 730000China

Nowadays,it is a matter of great concern to design electrode materials with excellent electrochemical performance for supercapacitors by a safe,efficient and simple *** these characteristics are usually related to the vacancies and impurities in the *** investigate the effect of the vacancies on the electrochemical properties of the supercapacitor cathode material,the uniform reduced CoNi2S4(r-CoNi2S4)nanosheets with sulfur vacancies have been successfully prepared by a one-step hydrothermal *** the formation of sulfur vacancies are characterized by Raman,X-ray photoelectron spectroscopy and other *** the electrode for supercapacitor,the r-CoNi2S4 nanosheet electrode delivers a high capacity of 1918.9 Fg-1 at a current density of 1 A g-1,superior rate capability(87.9%retention at a current density of 20 A g-1)and extraordinary cycling *** with the original CoNi2S4 nanosheet electrode(1226 F g-1at current density of 1 A g-1),the r-CoNi2S4 nanosheet electrode shows a great *** asymmetric supercapacitor based on the r-CoNi2S4 positive electrode and activated carbon negative electrode exhibits a high energy density of 30.3 Wh kg-1 at a power density of 802.1 W kg-1,as well as excellent long-term cycling *** feasibility and great potential of the device in practical applications have been successfully proved by lightening the light emitting diodes of three different colors.

关键词： defect engineering sulfur vacancies electrochemical performance asymmetric supercapacitors

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Performance Enhancement of Transparent and Flexible Triboelectric Nanogenerator Based on One-Dimensionally Hybridized Copper/Polydimethylsiloxane Film

SSRN

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SSRN 2022年

作者： Li, Gui-Zhong Cai, Ya-Wei Wang, Gui-Gen Sun, Na Li, Fei Zhou, Hai-Ling Zhang, Xiao-Nan Zhao, Hai-Xu Wang, Yuanhao Han, Jie-Cai Yang, Ya Shenzhen518055 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China SUSTech Engineering Innovation Center School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing100049 China College of Mechanical and Electrical Engineering Wenzhou University Wenzhou325035 China

Wearable/portable devices are essential for the automation, intelligence and digitization of next-generation electronic products. However, it is still challenging to obtain a kind of flexible, transparent and lightweight power source for these. Here, these were fabricated by cost-effective and feasible methods for both TENG with dual-electrode mode (tribo-negative layer: poly-(dimethylsiloxane)/copper nanowires (PDMS/Cu NWs), trio-positive layer: PET), and TENG with single-electrode mode based on half-embedded Cu NWs electrode and PDMS/Cu NWs negative friction layer s. Respectively, these as-obtained TENGs show good flexibilities and transparency. Meanwhile, the two kinds of TENG exhibit high output voltages and power densities of 120 V and 2.0 W/m2, 45 V and 0.135 W/m2, respectively. The enhancements are ascribed to the increase of capacitance and electron flow in the tribo-electric layers caused by doping Cu NWs. The advantages of the PDMS/Cu NWs based TENG include the ease of fabrication, good biocompatibility, flexibility and transparency, empowering it as a promising sustainable method for obtaining daily environmental energy as a self-powered source to drive wearable/portable electronic devices. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

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Performance Enhancement of Transparent and Flexible Triboelectric Nanogenerator Based on One-Dimensionally Hybridized Copper/Polydimethylsiloxane Film

SSRN

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SSRN 2022年

作者： Li, Gui-Zhong Cai, Ya-Wei Wang, Gui-Gen Sun, Na Li, Fei Zhou, Hai-Ling Zhang, Xiao-Nan Zhao, Hai-Xu Wang, Yuanhao Han, Jie-Cai Yang, Ya Shenzhen518055 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China SUSTech Engineering Innovation Center School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing100049 China College of Mechanical and Electrical Engineering Wenzhou University Wenzhou325035 China

Wearable/portable devices are essential for the automation, intelligence and digitization of next-generation electronic products. However, it is still challenging to obtain a kind of flexible, transparent and lightweight power source for these. Here, both a dual-electrode poly-(dimethylsiloxane)/copper nanowires (PDMS/Cu NWs) based TENG and a single-electrode mode TENG based on half-embedded Cu NWs electrode and PDMS/Cu NWs negative friction layer was fabricated by cost-effective and feasible methods. Respectively, these as-obtained TENGs show good flexibilities and transparency. Meanwhile, the two kinds of TENG exhibit high output voltages and power densities of 120 V and 2.0 W/m 2 , 45 V and 0.135 W/m 2 , respectively. The enhancements are ascribed to the increase of capacitance and electron flow in the friction layers caused by doping Cu NWs. The advantages of the PDMS/Cu NWs based TENG include the ease of fabrication, good biocompatibility, flexibility and transparency, empowering it as a promising sustainable method for obtaining daily environmental energy as a self-powered source to drive wearable/portable electronic devices. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

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Effect of Hemoglobin Hydration on the Physical Properties of Erythrocyte Cytoplasm and Whole Blood

SSRN

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SSRN 2022年

作者： Zhbanov, Alexander Lee, Ye Sung Son, Minkook Jung, Myoung Hoon Eom, Kunsun Yang, Sung 123 Cheomdangwagi-ro Buk-gu Gwangju61005 Korea Republic of 123 Cheomdangwagi-ro Buk-gu Gwangju61005 Korea Republic of Healthcare Sensor Lab Device Research Center Samsung Advanced Institute of Technology Samsung Electronics Co. Ltd. 130 Samsung-ro Yeongtong-gu Suwon-si Gyeonggi-do 16678 Korea Republic of

Electrochemical impedance spectroscopy of whole blood and blood cells has great potential for assessing the health of patients. This potential has not been fully exploited for a detailed examination of the erythrocyte interior. The erythrocyte interior (cytoplasm) is often considered as continuous media. However, cytoplasm is a colloidal suspension of hydrated hemoglobin molecules. This study mainly focuses on the effect of hemoglobin hydration on the dielectric properties of erythrocyte cytoplasm and whole blood. The impedance spectra of separated cytoplasm and whole blood were measured at frequencies from 1 kHz to 110 MHz. The effective medium theory was used to analyze the experimental data. The cytoplasm was found to be best described as a colloid of hemoglobin cores surrounded by double hydration shells. The dielectric properties of the hemoglobin core, hydration shells and free intracellular fluid, as well as the thickness of the shells, were numerically determined from the impedance spectrum. An approach was developed to determine the intracellular fluid's viscosity and the density of bound water in the hydration shells. It shows that the hemoglobin hydration has a significant effect on the physical properties of blood. The detailed electrical properties of the cytoplasm can be detected from the impedance spectrum of whole blood. © 2022, The Authors. All rights reserved.

关键词： Hemoglobin

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Landau quantization and spin polarization of cold magnetized quark matter

arXiv

引用

arXiv 2022年

作者： Lu, Zhen-Yan Xu, Jian-Feng Wen, Xin-Jian Peng, Guang-Xiong Ruggieri, Marco Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Hunan University of Science and Technology Xiangtan411201 China School of Physics and Electrical Engineering Anyang Normal University Anyang455000 China Department of Physics Institute of Theoretical Physics Shanxi University Taiyuan030006 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China

The magnetic field and density behaviors of various thermodynamic quantities of strange quark matter under compact star conditions are investigated in the framework of the thermodynamically self-consistent quasiparticle model. For individual species, a larger number density ni leads to a larger magnetic field strength threshold that align all particles parallel or antiparallel to the magnetic field. Accordingly, in contrast to the finite baryon density effect which reduces the spin polarization of magnetized strange quark matter, the magnetic field effect leads to an enhancement of it. We also compute the sound velocity as a function of the baryon density and find the sound velocity shows an obvious oscillation with increasing density. Except for the oscillation, similar to the zero-magnetic field case that the sound velocity grows with increasing density and approaches the conformal limit Vs2 = 1/3 at high densities from below. © 2022, CC BY-SA.

关键词： Magnetic fields

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