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International SAMPE Conference and Exhibition 2020

作者： Kim, Seokpum Yeole, Pritesh Hassen, Ahmed Arabi Kumar, Vipin Kunc, Vlastimil Vaidya, Uday Oak Ridge National Laboratory Energy and Transportation Science Division Oak RidgeTN37830 United States Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee Estabrook Rd KnoxvilleTN37996 United States Oak Ridge National Laboratory Materials Science and Technology Division Oak RidgeTN37830 United States 2370 Cherahala Blvd KnoxvilleTN37932 United States

Carbon Fiber Reinforced Polymer (CFRP) composites have been used in additive manufacturing (AM) to increase the stiffness and strength of the parts. CFRP produced by AM is being considered for tooling applications. In AM, short carbon fibers are aligned along the deposition direction. However, it results in anisotropic thermal properties that affect the heat transfer and warpage of the final part. In this study, three male molds with different infill patterns were considered based on the slicing software for the extrusion deposition fabrication-additive manufacturing (EDF-AM) process. These include (a) 0°: Infill pattern along the printing direction;(b) 90°: Infill pattern perpendicular to the printing direction;(c) 0°/90°: Alternate layers along and perpendicular directions. Finite Element Analysis (FEA) was conducted to understand the effect of infill pattern on a heat propagation. The results show that the directionality of the infill affects the heating performance. © 2020 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Molds

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Memory seeds enable high structural phase purity in 2D perovskite films for high-efficiency devices

Research Square

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Research Square 2021年

作者： Sidhik, Siraj Li, Wenbin Samani, Mohammad H.K. Zhang, Hao Wang, Yafei Hoffman, Justin Fehr, Austin K. Wong, Michael Katan, Claudine Even, Jacky Marciel, Amanda B. Kanatzidis, Mercouri G. Blancon, Jean-Christophe Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States UMR 6226 RennesF-35000 France Univ Rennes INSA Rennes CNRS Institut FOTON UMR 6082 RennesF-35000 France

Two-dimensional (2D) perovskites are a class of halide perovskites offering a pathway for realizing efficient and durable optoelectronic devices. However, the broad chemical phase space and lack of understanding of film formation have led to quasi-2D perovskite films with polydispersity in perovskite layer thicknesses, which have hindered devices performance and stability. Here, we demonstrate a scalable approach involving dissolution of single-phase crystalline powders with homogeneous perovskite layer thickness in desired solvents, to fabricate 2D perovskite thin-films with high phase purity. In-situ characterizations reveal the presence of sub-micron-sized seeds in solution that preserve the memory of the dissolved single-crystals and dictate the nucleation and growth of grains with identical thickness of the perovskite layers in thin-films. Photovoltaic devices fabricated with such films, yields an efficiency of 17.1% and 1.20V open-circuit voltage, while preserving 97.5% of their peak-performance after 800 hours under illumination without any external thermal management. © 2021, CC BY.

关键词： Nucleation

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Discovery of ultrafast myosin, its amino acid sequence, and structural features

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Proceedings of the National Academy of sciences of the United States of America 2022年第8期119卷 e2120962119页

作者： Haraguchi, Takeshi Tamanaha, Masanori Suzuki, Kano Yoshimura, Kohei Imi, Takuma Tominaga, Motoki Sakayama, Hidetoshi Nishiyama, Tomoaki Murata, Takeshi Ito, Kohji Department of Biology Graduate School of Science Chiba University Chiba 263-8522 Japan Department of Chemistry Graduate School of Science Chiba University Chiba 263-8522 Japan Faculty of Education and Integrated Arts and Sciences Waseda University Shinjuku-ku Tokyo 162-8480 Japan Department of Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda University Shinjuku-ku Tokyo 162-8480 Japan Department of Biology Graduate School of Science Kobe University Nada-ku Kobe 657-8501 Japan Research Center for Experimental Modeling of Human Disease Kanazawa University Kanazawa 920-0934 Japan Membrane Protein Research and Molecular Chirality Research Center Chiba University Chiba 263-8522 Japan Structure Biology Research Center Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan

Cytoplasmic streaming with extremely high velocity (∼70 μm s21) occurs in cells of the characean algae (Chara). Because cytoplasmic streaming is caused by myosin XI, it has been suggested that a myosin XI with a vel... 详细信息

Cytoplasmic streaming with extremely high velocity (∼70 μm s²¹) occurs in cells of the characean algae (Chara). Because cytoplasmic streaming is caused by myosin XI, it has been suggested that a myosin XI with a velocity of 70 μm s²¹, the fastest myosin measured so far, exists in Chara cells. However, the velocity of the previously cloned Chara corallina myosin XI (CcXI) was about 20 μm s²¹, one-third of the cytoplasmic streaming velocity in Chara. Recently, the genome sequence of Chara braunii has been published, revealing that this alga has four myosin XI genes. We cloned these four myosin XI (CbXI-1, 2, 3, and 4) and measured their velocities. While the velocities of CbXI-3 and CbXI-4 motor domains (MDs) were similar to that of CcXI MD, the velocities of CbXI-1 and CbXI-2 MDs were 3.2 times and 2.8 times faster than that of CcXI MD, respectively. The velocity of chimeric CbXI-1, a functional, full-length CbXI-1 construct, was 60 μm s²¹. These results suggest that CbXI-1 and CbXI-2 would be the main contributors to cytoplasmic streaming in Chara cells and show that these myosins are ultrafast myosins with a velocity 10 times faster than fast skeletal muscle myosins in animals. We also report an atomic structure (2.8-Å resolution) of myosin XI using X-ray crystallography. Based on this crystal structure and the recently published cryo-electron microscopy structure of acto-myosin XI at low resolution (4.3-Å), it appears that the actin-binding region contributes to the fast movement of Chara myosin XI. Mutation experiments of actin-binding surface loops support this hypothesis. © 2022 National Academy of sciences. All rights reserved.

关键词： Actin Crystal structure Cytoplasmic streaming Molecular motor Myosin

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The Design of a Parkinson’s Tremor Predictor and Estimator Using a Hybrid Convolutional-Multilayer Perceptron Neural Network

The Design of a Parkinson’s Tremor Predictor and Estimator ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Anas Ibrahim Yue Zhou Mary E. Jenkins Ana Luisa Trejos Michael D. Naish Department of Electrical and Computer Engineering (ECE) Western University School of Biomedical Engineering (BME) Western University Movement Disorders Program Clinical logical Sciences Western University ECE and BME Western University Department of Mechanical and Materials neering ECE and BME Western University London ON Canada

ISBN: (数字)9781728119908

ISBN: (纸本)9781728119915

Parkinson's Disease (PD) is considered to be the second most common age-related neuroegenerative disorder, and it is estimated that seven to ten million people worldwide have PD. One of the symptoms of PD is tremor, and studies have shown that wearable assistive devices have the potential to assist in suppressing it. However, despite the progress in the development of these devices, their performance is limited by the tremor estimators they use. Thus, a need for a tremor model that helps the wearable assistive devices to increase tremor suppression without impeding voluntary motion remains. In this work, a user-independent and task-independent tremor and voluntary motion detection method based on neural networks is proposed. Inertial measurement units (IMUs) were used to measure acceleration and angular velocity from participants with PD, these data were then used to train the neural network. The achieved estimation percentage accuracy of voluntary motion was 99.0%, and the future prediction percentage accuracy was 97.3%, 93.7%, 91.4% and 90.3% for 10 ms, 20 ms, 50 ms and 100 ms ahead, respectively. The root mean squared error (RMSE) achieved for tremor estimation was an average of 0.00087 ° /s on new unseen data, and the future prediction average RMSE across the different tasks achieved was 0.001 ° /s, 0.002 ° /s, 0.020 ° /s and 0.049 ° /s for 1 ms, 2 ms, 5 ms, and 10 ms ahead, respectively. Therefore, the proposed method shows promise for use in wearable suppression devices.

关键词： Task analysis Neurons Convolution Feature extraction Estimation Neural networks Assistive devices

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Improving dye-sensitized solar cell longevity: An aerogel encapsulation approach

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Journal of the Taiwan Institute of Chemical Engineers 2025年 174卷

作者： Mahalingam, Savisha Manap, Abreeza Lau, Kam Sheng Floresyona, Dita Chia, Chin Hua Afandi, Nurfanizan Chelvanathan, Puvaneswaran Arith, Faiz Nugroho, Agung Institute of Sustainable Energy Universiti Tenaga Nasional Jalan IKRAM-UNITEN Selangor Kajang43000 Malaysia Materials Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Department of Chemical Engineering Faculty of Industrial Technology Universitas Pertamina Jalan Teuku Nyak Arief Simprug Kebayoran Lama Jakarta 12220 Indonesia Department of Mechanical Engineering College of Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN Kajang43000 Malaysia Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Faculty of Electronics and Computer Technology and Engineering Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Durian Tunggal Melaka 76100 Malaysia

The primary challenge in dye-sensitized solar cells (DSSCs) is electrolyte leakage, compromising long-term stability and performance. Alternative electrolytes and encapsulation strategies have been explored to address this. In this study, we propose using nitrogen, fluorine, and sulfur-doped reduced graphene oxide (NSF-rGO) aerogel as an electrolyte encapsulator within DSSCs. The NSF-rGO aerogel was synthesized using a one-pot hydrothermal technique and serves to trap the liquid electrolyte, enhancing cell stability while maintaining conductivity. Although the initial power conversion efficiency of the NSF-rGO-based DSSC was lower than that of the conventional DSSC, it demonstrated significantly improved long-term stability. After two years, the efficiency drop in the NSF-rGO encapsulated DSSC was notably less than in the conventional design, indicating effective electrolyte retention and resistance to degradation. These results suggest that NSF-rGO aerogel encapsulation is a promising strategy for extending the operational lifespan of DSSCs and contributing to more sustainable energy solutions. © 2025 Taiwan Institute of Chemical Engineers

关键词： Proton conductivity

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Compaction self-assembly of ultralow-binder-content thermoplastic composites based on lunar soil simulant

arXiv

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arXiv 2020年

作者： Oh, Kiwon Chen, Tzehan Kou, Rui Yi, Haozhe Qiao, Yu Program of Materials Science and Engineering University of California – San Diego San DiegoCA92093 United States Department of Structural Engineering University of California – San Diego San DiegoCA92093-0085 United States

In a recent study, we developed ultralow-binder-content (UBC) structural materials based on lunar soil simulant and thermoset binders. In the current research, we investigated thermoplastic binders. Compared to thermosets, advanced thermoplastics could be more UV resistant, more durable, more robust, and recyclable. Our main technology is the compaction self-assembly (CSA). By using only ~4 wt% polyetherketoneketone (PEKK) binder, the thermoplastic-binder UBC composite was stronger than typical steel-reinforced concrete. The CSA operation was separate from the curing process. This study may provide an important in-situ resource utilization method for large-scale construction on Moon. Copyright © 2020, The Authors. All rights reserved.

关键词： Reinforced plastics

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Recent advances in metal/covalent organic frameworks based materials: Their synthesis, structure design and potential applications for hydrogen production

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Coordination Chemistry Reviews 2023年 483卷

作者： Wei-Ting Chung Islam M.A. Mekhemer Mohamed Gamal Mohamed Ahmed M. Elewa Ahmed F.M. EL-Mahdy Ho-Hsiu Chou Shiao-Wei Kuo Kevin C.-W. Wu Department of Chemical Engineering National Taiwan University (NTU) No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Department of Chemical Engineering National Tsing Hua University Hsinchu 300044 Taiwan Department of Materials and Optoelectronic Science Center for Crystal Research National Sun Yat-Sen University Kaohsiung 804 Taiwan Institute of Biomedical Engineering & Nanomedicine National Health Research Institute Keyan Road Zhunan Miaoli City 350 Taiwan

In recent years, both-organic frameworks (MOFs) based and covalent-organic frameworks (COFs) based materials have been extensively utilized for catalysis because of their specific surface area, tunable porosity, and structural versatility. Amongst the various MOFs/COFs-based catalysis implementation, catalytic hydrogen production (H 2 ) processes have subbed attention to alternative energy stemming from fossil fuel and the increasing global warming issue. As the growing demand for a sustainable, renewable, safe, and stable energy supply for the future is in urgent need, had urgently needed potential green energy or future energy attributed to the promising power-to-gas energy storage technology and the environmentally friendly zero carbon emission. Nowadays, most of the hydrogen is granted by the reforming reactions because of its mature large-scale production technology and economic benefits; in addition, electrochemical water splitting is another prospective route for hydrogen generation to fulfill the carbon reality. In this review, we provide an overview of the recent applications and developments of hydrogen production by using MOFs/COFs and the derived catalysts, including (1) the steam reforming reaction, (2) the dry reforming reaction, (3) the electrocatalytic water splitting, (4) the photocatalytic water splitting, and (5) the photo-electrocatalytic water splitting. Furthermore, we focus on the design of MOF/COF-based catalysts. Finally, the opportunities and challenges are also overviewed to guide the MOFs/COFs-derived catalysts applied for their hydrogen production (H 2 ).

关键词： Metal-organic frameworks Covalent-organic frameworks Catalytic hydrogen evolution Steam reforming reaction Dry reforming reaction

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Polar state memory in active fluids

arXiv

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arXiv 2021年

作者： Zhang, Bo Yuan, Hang Sokolov, Andrey De La Cruz, Monica Olvera Snezhko, Alexey Materials Science Division Argonne National Laboratory 9700 South Cass Avenue ArgonneIL60439 United States Applied Physics Graduate Program Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University 2220 Campus Drive EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University 2145 Sheridan Road EvanstonIL60208 United States

Spontaneous emergence of correlated states such as flocks and vortices are prime examples of remarkable collective dynamics and self-organization observed in active matter [1–6]. The formation of globally correlated polar states in geometrically confined systems proceeds through the emergence of a macroscopic steadily rotating vortex that spontaneously selects a clockwise or counterclockwise global chiral state [7, 8]. Here, we reveal that a global vortex formed by colloidal rollers exhibits state memory. The information remains stored even when the energy injection is ceased and the activity is terminated. We show that a subsequent formation of the collective states upon re-energizing the system is not random. We combine experiments and simulations to elucidate how a combination of hydrodynamic and electrostatic interactions leads to hidden asymmetries in the local particle positional order encoding the chiral state of the system. The stored information can be accessed and exploited to systematically command subsequent polar states of active liquid through temporal control of the activity. With the chirality of the emergent collective states controlled on-demand, active liquids offer new possibilities for flow manipulation, transport, and mixing at the microscale. Copyright © 2021, The Authors. All rights reserved.

关键词： Vortex flow

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Fabrication a sustainable adsorbent nanocellulose-mesoporous hectorite bead for methylene blue adsorption

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Holilah Asranudin El Messaoudi, Noureddine Ulfa, Maria Hamzah, Amir Hamid, Zuratul Ain Abdul Ramadhani, Dini Viandi Suryanegara, Lisman Mahardika, Melbi Melenia, Alvina Tata Pratama, Agus Wedi Prasetyoko, Didik Research Center for Biomass and Bioproducts National Research and Innovation Agency of Indonesia (BRIN) Research Collaboration Center for Nanocellulose BRIN-Andalas University Research Collaboration Center for Biomass and Biorefinery Between BRIN and Universitas Padjadjaran Laboratory of Applied Chemistry and Environment Faculty of Sciences Ibn Zohr University Chemistry Education Study Program Faculty of Teacher Training and Education Sebelas Maret University Deputy for Infrastructure Research and Innovation National Research and Innovation Agency of Indonesia (BRIN) School of Materials & Mineral Resources Engineering Universiti Sains Malaysia Department of Biology Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember (ITS) Kampus ITS Sukolilo

In this study, fabrication of mesoporous nanocellulose-hectorite-alginate bead (B-NcH) composites and their application for adsorption of MB from water was carried out. The synthesis of nanocellulose (NC) was conducted from mangosteen waste peel (Garcinia mangostana L.). Garcinia mangostana L. peel had 58.9 ± 0,41 % content of cellulose. NCs was successfully isolated using the acid hydrolysis method. NC from Garcinia mangostana L. peel had a diameter of 24.5 ± 0.2 nm and a length of 381.2 ± 10.4 nm. The superabsorbent was composed of nanocrystalline cellulose, mesoporous hectorite, and alginate. The functional group, phase, and morphology of composite was investigated. The composite with 5 % NC had excellent mechanical strength. The B-NcH5 showed a high adsorption capacity of methylene blue (MB), reaching 98.64 % at an adsorbent dose of 30 mg for 90 min. The presence of hectorite can increase the adsorption ability compared to NCs-alginate. The equilibrium adsorption data followed the Freundlich isotherm;however, the kinetics of adsorption showed the usefulness of adopting the PSO kinetic model. The highest adsorption capacity of B-NcH5 for MB was determined to be 57.59 mg/g. For thermodynamic studies, it was revealed that the adsorption of MB on BNcH-5 is a spontaneous and endothermic process. The removal efficiency was observed in six consecutive cycles, indicating at the favorable reusability of this adsorbent. These results validate the potential use of this B-NcH5 adsorbent for water treatment applications. © 2024

关键词： Adsorption Bead Hectorite Methylene blue Nanocellulose Water treatment

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Sand-filler structural material with low content of polyethylene binder

arXiv

引用

arXiv 2020年

作者： Yi, Haozhe Oh, Kiwon Kou, Rui Qiao, Yu Department of Structural Engineering University of California - San Diego San JoseCA92093-0085 United States Program of Materials Science and Engineering University of California - San Diego San JoseCA92093 United States

Currently, most of the waste plastics cannot be recycled, causing serious environmental concerns. In this research, we investigated a compaction formation technology to fabricate structural materials with thermoplastic binders. When the compaction pressure was 70~100 MPa, with only ~10 wt% polyethylene binder, the flexural strength was greater than that of typical steel-reinforced concrete, suitable to many construction applications. Because construction materials are tolerant to impurities, our work may provide a promising opportunity to recycle waste plastics and to reduce the portland cement production. Copyright © 2020, The Authors. All rights reserved.

关键词： Reinforced concrete

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