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ACS Electrochemistry 2025年第4期1卷 453-464页

作者： Busra Ozlu Saimon Moraes Silva Simon E. Moulton Bong Sup Shim Program in Biomedical Science & Engineering Inha University 100 Inha-ro Michuhol-gu Incheon 22212 Republic of Korea Department of Biochemistry and Chemistry La Trobe Institute for Molecular Science The Biomedical and Environmental Sensor Technology (BEST) Research Centre La Trobe University Melbourne Victoria 3086 Australia ARC Centre of Excellence for Electromaterials Science Faculty of Science Engineering and Technology Swinburne University of Technology Hawthorn Victoria 3122 Australia；Aikenhead Centre for Medical Discovery St Vincent’s Hospital Melbourne Melbourne Victoria 3065 Australia；Iverson Health Innovation Research Institute Swinburne University of Technology Melbourne Victoria 3122 Australia Program in Biomedical Science & Engineering Inha University 100 Inha-ro Michuhol-gu Incheon 22212 Republic of Korea；Department of Chemical Engineering Inha University 100 Inha-ro Michuhol-gu Incheon 22212 Republic of Korea

Melanin, a natural biopolymer with a conjugated backbone, stands out as a promising candidate for bioelectronics owing to its redox activity, metal ion chelation, hydration-dependent electrical response, wet adhesion, potential electronic transport, anti-inflammatory properties, and excellent thermal stability. In this study, we explore the impact of hybridizing liquid crystalline graphene oxide (LCGO) into the conductive melanin-like polymer polydopamine (PDA) on the morphology, stability, and synergistic electrochemical performance. Our findings reveal that the gold electrode coated with PDA:LCGO composites exhibit more than two orders of magnitude lower impedance and more than 100 times higher charge storage capacity compared to both bare gold electrodes and those coated with pure PDA. Furthermore, we demonstrate that the morphology and the electrode performance could be tuned by adjusting the synthesis parameters in the PDA:LCGO electrochemical deposition. This PDA:LCGO composite, with its superior electrochemical performance, holds promise for diverse bioelectronics applications ranging from biosensors to implantable bionic interfaces.

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Structural evaluation of Poly(lactic acid) degradation at standardized composting temperature of 58 degrees

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Chemosphere 2024年 354卷 141729页

作者： Oh, Jiwon Park, Sung Bae Cha, Chaenyung Hwang, Dong Ki Park, Seul-A Park, Jeyoung Oh, Dongyeop X. Jeon, Hyeonyeol Koo, Jun Mo Ulsan44429 Korea Republic of Ulsan44919 Korea Republic of Pohang37673 Korea Republic of Department of Chemical and Biomolecular Engineering Sogang University Seoul04107 Korea Republic of Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of Daejeon34113 Korea Republic of Department of Organic Materials Engineering Chungnam National University Daejeon34134 Korea Republic of

The accumulation of petroleum-based plastics on our planet is causing serious environmental pollution. Biodegradable plastics, promoted as eco-friendly solutions, hold the potential to address this issue. However, their impact on the environment and the mechanisms of their natural degradation remain inadequately understood. Furthermore, the specific conditions set forth in international standards for evaluating the biodegradability of biodegradable plastics have led to misconceptions about their real-world behavior. To properly elucidate the relationship between their degradability and structure, this study mimics the thermal effect on poly(lactic acid) (PLA) under standardized composting temperature. The higher the crystallinity of PLA, the lower the degradation rate, which suggests that crystallinity is a key factor in determining degradation. The composting temperature of 58 °C induces crystallization by having a structural effect on the polymer, which in turn reduces the degradation rate of PLA. Therefore, control over temperature and crystallization during the processing and degradation of PLA is crucial, as it not only determines the biodegradability but also enhances the utility. © 2024

关键词： Biodegradability

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TREATMENT OF DIRECT BLUE 15 (DB15) BY FERED-FENTON

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Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University 2022年第3期57卷 363-372页

作者： Marlina, Elin Purwanto, Purwanto Sudarno, Sudarno Sari, Ajeng Arum Doctoral Program of Environmental Science School of Postgraduate Studies Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Research Unit for Clean Technology Indonesian Institute of Sciences Bandung Indonesia

The Fered-Fenton process is one of the proposed options across the set of electrochemical oxidation processes. The primacy of this process is in-situ production of oxidation factors such as the hydroxyl radical (OH•). In this study, the Fered-Fenton process was adopted for the degradation of Direct Blue 15 (DB15) in wastewater by variating operational factors such as initial pH, applied current, and H2O2 and Fe2+ concentrations. The efficiency of color removal, chemical oxygen demand (COD) removal, functional group removal, and energy consumption of the Fered-Fenton process was evaluated. According to the results of this research, color and COD was degraded up to 90% and 86%, respectively, using graphite and Ti/Pt as electrodes. The presence of C-O absorption at wave number 1129.17 cm-1 also strengthens the presence of OH groups attached to the carbon chain. The energy consumption of this treatment was 20.4 kWh/L after 120 min. Therefore, the Fered-Fenton method is environmentally friendly for dye wastewater treatment. © 2022 science Press. All rights reserved.

关键词： Wastewater treatment

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Topological band gaps and edge modes materialized by symmetric silicon-on-insulator photonic crystal slabs in the mid-IR range

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Physical Review A 2023年第4期107卷 043507-043507页

作者： Afshan Begum Yuanzhao Yao Takashi Kuroda Yoshihiko Takeda Naoki Ikeda Yoshimasa Sugimoto Takaaki Mano Kazuaki Sakoda Center for Green Research on Energy and Environmental Materials National Institute for Materials Science Tsukuba 305-0003 Japan Doctoral Program in Materials Science and Engineering University of Tsukuba Tsukuba 305-8577 Japan Research Center for Functional Materials National Institute for Materials Science Tsukuba 305-0044 Japan Research Network and Facility Service Division National Institute for Materials Science Tsukuba 305-0047 Japan

We successfully fabricated silicon-on-insulator (SOI) photonic crystal (PhC) slabs in which electromagnetic topological band gaps and edge modes were materialized for symmetric transverse-electric-like modes. Because the structure of our specimens can be regarded as symmetric about the horizontal middle plane of the PhC slab, their symmetric and antisymmetric eigenmodes were rigorously separated, so we could achieve genuine photonic band gaps for the former. We fabricated those specimens by electron beam lithography of the top Si layer of SOI wafers and successive plasma-enhanced chemical vapor deposition of a SiO2 capping layer. We confirmed the complete common band gap of topologically trivial and nontrivial PhCs and the topological edge modes on the boundary between them by angle-resolved reflection spectroscopy in the mid-infrared range. This is an observation of the common band gap and edge modes that materialized in symmetric PhC slabs without a membrane structure, that is, without the etching of a sacrificial layer under the PhC to increase the refractive-index contrast and the width of the common band gap.

关键词： Nanophotonics Photonic crystals Photonics Topological effects in photonic systems

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Bacterial Mobility and Motility in Porous Media Mimicked By Microspheres

SSRN

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SSRN 2022年

作者： Shrestha, Diksha Ou, Jun Rogers, Ariel Jereb, Amani Wang, Yong Department of Physics Cell and Molecular Graduate Program Materials Science and Engineering Program University of Arkansas FayettevilleAR72701 United States Department of Environmental Resources Engineering Mechanical Engineering Program California State Polytechnic University Humboldt ArcataCA95521 United States

Bacterial motion in porous media are essential for their survival, proper functioning, and variousapplications. Here we investigated the motion of Escherichia coli bacteria in microsphere-mimicked porousmedia. We observed reduced bacterial velocity and enhanced directional changes of bacteria as the densityof microspheres increased, while such changes happened mostly around the microspheres and due to thecollisions with the microspheres. More importantly, we established and quantified the correlation betweenthe bacterial trapping in porous media and the geometric confinement imposed by the microspheres. In addition,numerical simulations showed that the active Brownian motion model in the presence of microspheresresulted in bacterial motion that are consistent with the experimental observations. Our study suggested thatit is important to distinguish the ability of bacteria to move easily – bacterial mobility – from the abilityof bacteria to move independently – bacteria motility. Our results showed that bacterial motility remainssimilar in porous media, but bacterial mobility was significantly affected by the pore-scale confinement. © 2022, The Authors. All rights reserved.

关键词： Microspheres

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Is a Simulation better than Teleoperation for Acquiring Human Manipulation Skill Data?

Is a Simulation better than Teleoperation for Acquiring Huma...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Donghyeon Kim Seong-Su Park Kwang-Hyun Lee Dongheui Lee Jee-Hwan Ryu Robotics Program Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Civil and Environmental Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Applied Science Research Institute Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Autonomous Systems Technische Universitat Wien (TU Wien) Vienna Austria

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

This study explores the feasibility of using simulations as a better interface to collect human object manipulation skills for learning from demonstrations (LfD). Recently, numerous researchers have started introducing teleoperation systems to acquire human manipulation skills. However, capturing the subtle, force-involved interaction skills of humans in teleoperation is still challenging due to its inherent dynamic delays and feedback transparency. This research evaluates the effectiveness of demonstration data obtained through simulation versus teleoperation. To evaluate the efficacy of this approach, tasks such as plane cutting, tight peg-in-hole, and deformable pipe plugging were performed to assess the quality of demonstrations acquired. The experimental results highlight the effectiveness of demonstration through simulation in capturing the operator’s force-involved interaction skills. Simulation creates an environment similar to performing tasks with bare hands by minimising dynamic delays due to the exclusion of physical robots and effectively rendering high stiffness. As a result, the demonstration through simulation method has proven effective in extracting interaction data and capturing physical task performance skills.

关键词： Hands Dynamics Rendering (computer graphics) Data models Delays Data mining Intelligent robots

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Impacts of Faculty Development on Interdisciplinary Undergraduate Teaching and Learning in the Food-Energy-Water Nexus

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Journal of College science Teaching 2022年第6期51卷 66-74页

作者： Sommers, Amie S. White, Holly Dauer, Jenny M. Forbes, Cory STEM education specialist in the Engineering and Computing Education Core College of Engineering University of Nebraska-Lincoln United States Ecology and Environmental Sciences program at the University of Maine United States School of Natural Resources at the University of Nebraska-Lincoln United States Department of Curriculum and Instruction Science Education STEM Education Research Collaboratorium and Resource Center College of Education University of Texas Arlington United States

To support undergraduate instruction and learning outcomes (i.e., systems thinking and decision-making in interdisciplinary contexts) grounded in the Food-Energy-Water Nexus (FEWNexus), we implemented a multiyear faculty development program around a new minor. In this article, we build on a previous study to investigate teaching in FEW Nexus minor courses, as well as student outcomes before and after participation in the faculty development program. We analyzed video recordings of courses to identify teaching style and scored pre- and postcourse student assessments of decision-making and systems thinking quantitatively. Post-program teaching was more student centered (50%) than pre-program (37.5%;p = 1.9e^-6). Faculty who taught courses with longer class periods incorporated more active learning than in short class periods (pre: p = 2.2e^-16;post: p = 2.2e^-16). Despite changes in instruction, we did not observe changes in decision-making and systems thinking outcomes. However, results indicate that providing faculty with resources and time can facilitate implementation of best practices and that further support and research are needed to connect these practices with positive outcomes. © 2022 National science Teaching Association.

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Ultra-thin Carbon Biphenylene Network as an Anisotropic Thermoelectric Material with High Temperature Stability Under Mechanical Strain

arXiv

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arXiv 2024年

作者： Sargın, Gözde Özbal Demirci, Salih Gong, Kai Özçelik, V. Ongun Faculty of Engineering and Natural Sciences Sabanci University Istanbul34956 Turkey Department of Physics Kırıkkale University Kırıkkale71450 Turkey Department of Civil and Environmental Engineering Rice University TX77005 United States Materials Science and Nano Engineering Program Sabanci University Istanbul34956 Turkey

Carbon biphenylene network (C-BPN), which is an ultra-thin material consisting of carbon atoms arranged in square-hexagonal-octagonal (4-6-8) periodic rings, has intriguing properties for nano-scale device design due to its unique crystal structure. Here, using the Landauer formalism in combination with first-principles calculations, we show that C-BPN is a highly stable thermoelectric material at elevated temperatures under mechanical strain, where its thermoelectric efficiency can be anisotropically engineered. Transport calculations reveal that C-BPN’s transmission spectrum has significant degrees of directional anisotropy and it undergoes a metal-insulator transition under strain, which leads to an increase in its Seebeck coefficient. C-BPN’s lattice thermal conductance can be selectively tuned up to 35% bidirectionally at room temperature by strain engineering. Enhancement in its power factor and the suppression of its lattice thermal conductance improves the p-type figure of merit up to 0.31 and 0.76 at 300 and 1000 K, respectively. Our findings reveal that C-BPN has high potency to be used in thermoelectric nano devices with selective anisotropic properties at elevated temperatures. Copyright © 2024, The Authors. All rights reserved.

关键词： Metal insulator transition

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High-Temperature Decomposition of Diisopropyl Methylphosphonate (DIMP) on Alumina: Mechanistic Predictions from Ab Initio Molecular Dynamics

arXiv

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arXiv 2022年

作者： Biswas, Sohag Wong, Bryan M. Department of Chemical & Environmental Engineering Materials Science & Engineering Program Department of Physics & Astronomy Department of Chemistry University of California-Riverside RiversideCA92521 United States

The enhanced degradation of organophosphorous-based chemical warfare agents (CWAs) on metal-oxide surfaces holds immense promise for neutralization efforts;however, the underlying mechanisms in this process remain poorly understood. We utilize large-scale quantum calculations for the first time to probe the high-temperature degradation of diisopropyl methylphosphonate (DIMP), a nerve agent simulant. Our Born-Oppenheimer molecular dynamics (BOMD) calculations show that the γ-Al2O3 surface shows immense promise for quickly adsorbing and destroying CWAs. We find that the alumina surface quickly adsorbs DIMP at all temperatures, and subsequent decomposition of DIMP proceeds via a propene elimination. Our BOMD calculations are complemented with metadynamics simulations to produce free energy paths, which show that the activation barrier decreases with temperature and DIMP readily decomposes on γ-Al2O3. Our first-principle BOMD and metadynamics simulations provide crucial diagnostics for sarin decomposition models and mechanistic information for examining CWA decomposition reactions on other candidate metal oxide surfaces. © 2022, CC BY.

关键词： Free energy

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Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Lightweight Concrete

SSRN

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SSRN 2024年

作者： Rafieizonooz, Mahdi Jay Kim, Jang-Ho Kim, Jin-Su Jo, Jae-Bin Khankhaje, Elnaz School of Civil and Environmental Engineering Yonsei University Yonsei-ro 50 Seodaemun-gu Seoul03722 Korea Republic of Architectural Engineering Program School of Architecture Seoul National University of Science and Technology 232 Gongneung-ro Gongneung-dong Nowon-gu Seoul01811 Korea Republic of

The study delved into the integration of carbon nanotubes (CNTs) in Ultra-High Performance Lightweight Concrete (UHPLC), exploring aspects such as mechanical properties, microstructure analysis, accelerated chloride penetration, and life service prediction. A dispersed CNT solution (0.025 to 0.075 wt%) was employed, along with a superplasticizer, to ensure high flowability in the UHPC slurry. Experimental findings unveiled that an increased concentration of CNT in CNT1 (0.025%) and CNT2 (0.05%) blends led to a marginal improvement in compressive strength compared to the control mix. Conversely, the CNT3 (0.075%) mixture exhibited a reduction in compressive strength with a rising CNT content as an admixture. SEM analysis depicted that the heightened concentration of CNTs as an admixture induced the formation of nanoscale bridges within the concrete matrix. Ponding test results indicated that, for all samples, the effective chloride transport coefficient remained below the standard limitation of 1.00 * E-12 m2/s, signifying acceptable performance in the ponding test for all samples. The life service prediction outcomes affirmed that, across various environmental scenarios, CNT1 and CNT2 mixtures consistently demonstrated superior performance compared to all other mixtures. © 2024, The Authors. All rights reserved.

关键词： Carbon nanotubes

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