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SSRN 2024年

作者： Dai, Jing Chen, Peng Meng, Fancheng Han, Feizi Zhu, Chenming Wei, Xiangfeng Zheng, Lianxi Liu, Jiehua School of Materials Science and Engineering Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of Education Hefei University of Technology Hefei230009 China Department of Mechanical Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates

A starch-polyacrylamide (S-PAM) double-network hydrogel with high ionic conductivity, water retention capacity, mechanical flexibility, and adhesion was prepared using a simple graft copolymerization technique. Surprisingly, the flexible zinc-air battery assembled with the high-performance S-PAM electrolyte and CoFe-NC bifunctional catalyst exhibited a high discharge voltage of 1.3 V and continuous cycles over 40 h. In addition, the battery maintained stable voltage output under various bending and whacking conditions, demonstrating a great potential for wearable applications. © 2024, The Authors. All rights reserved.

关键词： Catalysts

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A GLASS MICROFLUIDIC BIOELECTROCHEMICAL CELL PLATFORM FOR THE STUDY OF MICROBIAL EXTRACELLULAR ELECTRON UPTAKE 26

A GLASS MICROFLUIDIC BIOELECTROCHEMICAL CELL PLATFORM FOR TH...

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26th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2022

作者： Stoica, Andreea Rengasamy, Karthikeyan Ranaivoarisoa, Tahina O. Bose, Arpita Meacham, J. Mark Department of Mechanical Engineering and Materials Science United States Department of Biology Washington University in St. Louis St. LouisMO63130 United States

ISBN: (纸本)9781733419048

Miniaturization of measurement systems provides several advantages including improved flexibility, decreased sample size, better sensitivity, and the opportunity to multiplex different measurement modalities, opening pathways to new experimental studies. We introduce a scalable glass-based microfluidic bioelectrochemical cell (μ-BEC) platform that miniaturizes a three-electrode electrochemical reactor and multiplexes electrochemical measurements while incorporating imaging capability and microfluidic control. We developed the platform for the study of extracellular electron uptake (EEU) in microbes and used Rhodopseudomonas palustris TIE-1 (TIE-1) bacteria as a model organism. We demonstrate the use of microfluidic flow to remove planktonic cells and isolate the EEU response of the biofilm. © 2022 MicroTAS 2022 - 26th International Conference on Miniaturized Systems for Chemistry and Life sciences. All rights reserved.

关键词： Microfluidics

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Tunable Multimodal Guided Surface Lattice Resonances in Index-Discontinuous Environments

arXiv

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arXiv 2024年

作者： Huang, Suichu Yao, Kan Huang, Wentao Zhao, Xuezheng Zheng, Yuebing Pan, Yunlu Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of Education School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Walker Department of Mechanical Engineering Material Science and Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

Surface lattice resonances (SLRs) in metasurfaces are promising in applications of sub-wavelength devices, owning properties such as high quality (high-Q) factors, large local field enhancement and extensive long-range interaction. The tunable peak position and multimodal resonances of SLRs further enhance their appeal for flexible and multi-wavelength light-matter interactions. Despite these advantages, the realization of tunable multimodal SLRs often requires reconfiguring the lattices, leading to limited tunability. Furthermore, current high-Q SLR implementations necessitate a homogeneous dielectric environment, restricting potential applications such as biosensors that are typically operated in an aqueous or air cladding on a substrate. Here we present guided-SLRs (gSLRs), which are easily accessible in index-discontinuous environments while retaining the multimodal property and straightforward tunability of mode number, resonance wavelengths and mode coupling strengths. The gSLRs are achieved by coupling the scattered light from metasurface units into a slab waveguide, creating a light propagating channel in the lattice plane within an index-asymmetric environment. Tailoring the radiation pattern of individual units with guided transverse electric (TE) and transverse magnetic (TM) modes, multimodal resonances in both orthogonal and parallel coupling directions are accomplished. The mode number and resonance wavelengths can be easily controlled by adjusting the waveguide configuration, while the mode coupling strength is tuned by the vertical position of lattices in the slab. Further shift of the multimodal gSLRs from visible to near-infrared is achieved by introducing a gold backplane. The easy-to-access, flexibly tunable and multimodal gSLRs in inhomogeneous media offer a promising solution to advancing the realization of ultrathin and ultracompact nano-optical and optoelectronic devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Waveguides

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Development of a Novel Displacement-Sensitive Magnetorheological Damper for Vehicle Suspension with High-Speed Stability and Impact Resistance

Development of a Novel Displacement-Sensitive Magnetorheolog...

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International Conference on Applied Nonlinear Dynamics, Vibration and Control, ICANDVC 2024

作者： Tao, Zhu Gong, Ning Pan, Liyan Yu, Xiaotao Yang, Jian Sun, Shuaishuai CAS Key Laboratory of Mechanical Behaviour and Design of Materials School of Engineering Science University of Science and Technology of China Anhui Hefei230026 China School of Electrical Engineering and Automation Anhui University Anhui Hefei230039 China

ISBN: (纸本)9789819633166

With the ongoing enhancement of ride comfort standards, variable damping coefficient dampers are increasingly utilized in automobile suspensions. Among these, magnetorheological dampers (MRD) and continuous damping control dampers (CDC) are the most commonly used. MRD adjusts the damping coefficient by altering the magnetic field intensity, while CDC adjusts it by altering the flow channel size. However, due to the inherent delay of tens to hundreds of milliseconds in their damping coefficient adjustment, their effectiveness in suppressing high-frequency vibrations, particularly impacts, is limited. This paper introduces a novel displacement-sensitive MR damper (NDS-MRD). This damper controls its damping coefficient based on the position of the piston and the current amplitude. It offers a zero-delay adjustment of the damping coeffic.0ient, ensuring a substantial range of adjustable damping coefficients. Furthermore, the MTS force-displacement test and quarter-car model simulations confirm the distinct advantages of the NDS-MRD over conventional MR Damper and passive damper in terms of isolation from high-frequency vibrations and impact resistance. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Vehicle suspensions

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Sandwich-Type Mo-Fe-Mno2@Ag-Cnts Film Grown on Activated Carbon Cloth for Piezoelectric Self-Charging Supercapacitor

SSRN

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SSRN 2024年

作者： Sun, Luo Peng, Xinyuan Liu, Huaying Ao, Peiyun Ye, Zhiguo School of Materials Science and Engineering Nanchang Hangkong University Nanchang330063 China Science and Technology College NCHU Gongqingcheng332020 China School of Mechanical and Electrical Engineering Xinyu University Xinyu338004 China

The development of high energy storage and self-charging supercapacitors has significantly influenced the progress of microelectronic devices. However, the problems of too little energy generated by piezoelectric self-charging supercapacitors (SCSPCs) and the low specific capacitance of MnO2 at high mass loading remain unsolved. Here we report our findings in a sandwich-type composite electrode (AC@Mo-Fe-MnO2/ Ag-CNTs), which consists of four Mo, Fe-doped MnO2 films and three Ag, carbon nanotubes (CNTs) three-dimensional (3D) network sequentially stacked on top of each other, grown on the surface of activated carbon cloth (AC) using an advanced in-situ electrodeposition method. The AC@Mo-Fe-MnO2/Ag-CNTs composite electrode exhibits a high specific capacitance of 399.1 F g-1 and 1436.76 mF cm-2 with a mass loading of 3.6 mg cm-2 and maintains an excellent stability of 98.6% after 18000 cycles. Its constructed asymmetric supercapacitor (ASC) has an energy density as high as 58.8 mWh cm-2 at a power density of 27.5 W cm-2 with excellent cycling stability. In addition, the assembled SCSPC can self-charge up to 407 mV at a pressure of 20 N, achieving a high specific capacitance of 36.1 mF cm-2. This work provides some new insights into the development of high energy storage SCSPC, paving the way for their future applications in microelectronic devices. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

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Thermoelectrically Elevated Hydrogel Evaporation for Personal Cooling under Extreme Heat

arXiv

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arXiv 2025年

作者： Pei, Yu Feng, Tianshi Chambers, Robert Cai, Shengqiang Chen, Renkun Department of Mechanical and Aerospace Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Materials Science and Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States

Extreme heat events with wet-bulb temperatures (WBT) above 35°C pose serious risks to human survival, and conventional hydrogel evaporative cooling alone may not provide sufficient relief as it must be maintained at a sufficiently high temperature to achieve effective evaporation in hot, humid conditions. This study integrates thermoelectric devices (TEDs) with hydrogels to create an effective personal cooling solution. TEDs pump heat away from the skin to maintain comfort while simultaneously increasing the hydrogel’s temperature to enhance evaporation. This hybrid system outperforms TEDs or hydrogel alone in extreme conditions (temperature up to 55°C and relative humidity up to 88%, with WBT > 35°C) and can operate for over six hours with a manageable hydrogel and battery weight. The active temperature control of TEDs allows adaptation to changing thermal loads and environments. These results demonstrate the potential of hybrid evaporative and thermoelectric cooling as an efficient, adaptable, and sustainable personal cooling solution to combat extreme heat. Copyright © 2025, The Authors. All rights reserved.

关键词： Evaporative cooling systems

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Effects of Graphene on Twisting of High Density Polyethylene 37

Effects of Graphene on Twisting of High Density Polyethylene

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37th Technical Conference of the American Society for Composites, ASC 2022

作者： Anilal, Ashish Bendesky, Justin Jeong, Sehee Lee, Stephanie S. Bozlar, Michael Department of Mechanical and Aerospace Engineering Department of Materials Science and Engineering University of Texas at Arlington ArlingtonTX76019 United States Department of Chemistry Molecular Design Institute New York University NY1003 United States

ISBN: (纸本)9781605956909

High density polyethylene (HDPE) is known to form banded spherulites when crystallized from the melt. In such spherulites, concentric bands of alternating light and dark colors emanating from the spherulite nucleation center are observable between cross polarizers and appear as a function of the anisotropy of the dielectric susceptibility as crystal orientations continuously rotate about the growth direction. Recently, we identified PE to be a promising compound to induce twisting in conjugated carbonaceous systems, such as triisopropylsilylethynyl anthradithiophene (TIPS ADT). When blended together in ratios between 10 - 70 wt.% PE, TIPS ADT and PE crystals twist in concert with one another to form composite films of intertwined helicoidal fibrils. In this work, we investigate crystal twisting in HDPE-graphene oxide composites. In addition to its unique multifunctionality, graphene has also recently demonstrated peculiar twisting capabilities that strongly alter its physical properties. Here, we first produce graphene sheets through the chemical oxidation of natural graphite, and then investigate the influence of graphene on the twisting of HDPE composites under various processing parameters (graphene concentration, polymer cooling rate, etc). HDPE-graphene composites have been prepared using melt extrusion in the form of microfibers and films. We measured the influence of twisting on the mechanical and electrical properties of the composites, as well as the crystallographic structure using optical and electron microscopy, and X-Ray diffraction spectroscopy. © Proceedings of the American Society for Composites - 37th Technical Conference, ASC 2022. All rights reserved.

关键词： Graphene

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Body Attitude Control System for Magnetorheological Vehicle Suspension Based on IMU Solution

Body Attitude Control System for Magnetorheological Vehicle ...

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International Conference on Applied Nonlinear Dynamics, Vibration and Control, ICANDVC 2024

作者： Yu, Xiaotao Pan, Liyan Sun, Shuaishuai Yang, Jian School of Electrical Engineering and Automation Anhui University Anhui Hefei230039 China CAS Key Laboratory of Mechanical Behaviour and Design of Materials School of Engineering Science University of Science and Technology of China Anhui Hefei230026 China

ISBN: (纸本)9789819633166

The sensor system of semi-active vehicle suspensions typically consists of four sprung accelerometers and four height sensors, making it expensive and complex to wire. To simplify and optimize the sensor arrangement, reduce the number and cost of body sensors, and enhance the vibration damping performance of vehicles, a new sensor arrangement scheme for magnetorheological (MR) suspensions is proposed. This scheme utilizes an Inertial Measurement Unit (IMU) mounted on the sprung mass and four relative displacement sensors. The complete formula for the acceleration signal on the four-way sprung mass is derived, with the correct reference system and angular rotation order selected to ensure the accuracy of the solution method. The Kalman filter is used to design the angular acceleration estimator. This approach considers the measurement noise inherent to the IMU and provides real-time feedback for the calculation. In the simulation, the IMU was positioned at the vehicle’s center of mass, and the estimated values from the IMU solution under various road excitations were compared to the actual sprung accelerations using the vehicle model. Additionally, the robust H∞ control algorithm was employed to regulate the magnetorheological dampers. By comparing the sprung accelerations at the vehicle’s center of mass under various road excitations, the accuracy of the calculation and the damping effectiveness of this magnetorheological suspension control system were confirmed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Active suspension systems

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Tuning Zinc-Copper Dual-Ion Electrolytes to Extend the Cycle Life of Zinc Ion Capacitors

Tuning Zinc-Copper Dual-Ion Electrolytes to Extend the Cycle...

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International Flexible Electronics Technology Conference (IFETC)

作者： Jinwook Jung Chanho Shin Tse Nga Ng Program in Materials Science and Engineering University of California San Diego La Jolla USA Department of Electrical and Computer Engineering University of California San Diego La Jolla USA

ISBN: (数字)9798331529468

ISBN: (纸本)9798331529475

We investigated the effect of copper ion concentration in zinc-copper dual-ion electrolytes to suppress dendrites and extend the cycle life of zinc ion capacitors. The devices were characterized in terms of changes in microstructure and cycling stability. The nuclei size was decreased in the optimal copper ion concentration to promote lateral deposition and avoid vertical dendrites. The device exhibited stable cycling performance with a capacitance retention of 95% after 10,000 redox cycles, compared to the device with single zinc ion electrolyte which short circuited at around 1,250 redox cycles.

关键词： Performance evaluation Capacitors Redox Ions Electrolytes Dendrites (neurons) Copper Microstructure Zinc Tuning

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mechanical Properties of 3D-Printed ABS with Combinations of Two Fillers: Graphene Nanoplatelets, TiO2, ATO Nanocomposites, and Zinc Oxide Micro (ZnOm) 2nd

Mechanical Properties of 3D-Printed ABS with Combinations of...

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2nd International Conference on Recent Advances in Manufacturing, RAM 2021

作者： Vidakis, N. Petousis, M. Velidakis, E. Maniadi, A. Mechanical Engineering Department Hellenic Mediterranean University Crete Heraklion71410 Greece Department of Materials Science and Technology University of Crete VoutesCrete VassilikaHeraklion700 13 Greece

ISBN: (纸本)9789811677861

This work is focused on researching new polymer nanocomposites’ mixing and fabrication methods and to investigate nanomaterials’ interactions with the polymer matrix with the sole goal of enhancing the polymer’s mechanical properties. This research was focused on increasing the mechanical stability of three-dimensional (3D) printed parts by fabricating novel microcomposite and nanocomposite filaments. Those filaments were created by melt mixing and melt extrusion processing. Specimens were fabricated with commercially available 3D printers and further characterized. Graphene nanoplatelets (GnP), zinc oxide micro (ZnOm), titanium dioxide (TiO2), and antimony tin oxide (ATO) were selected to be combined with an acrylonitrile butadiene styrene (ABS) matrix at preselected concentrations. mechanical test specimens were fabricated, in accordance with international standards for tension and flexion. It was proven that these combinations of nanomaterials at the selected concentrations slightly decrease the mechanical stability of the polymer matrix due to possible agglomerations. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to identify any possible structural flaws and to assess the overall nanomaterial distribution inside the polymer matrix. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Acrylonitrile butadiene styrene (ABS) Antimony tin oxide (ATO) Graphene nanoplatelets (GnP) Material characterization Nanocomposites Three-dimensional (3D) printing Titanium dioxide (TiO2) Zinc oxide micro (ZnOm)

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