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In-situ growth of gold nanoparticles on electrospun flexible multilayered PVDF nanofibers for SERS sensing of molecules and bacteria

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Nano Research 2021年第12期14卷 4885-4893页

作者： Dongzhen Chen Liang Zhang Pan Ning Haozhi Yuan Yu Zhang Meng Zhang Tao Fu Xinhai He Key laboratory of functional textile sensing fiber and irregular shape weaving technology School of Materials Science&EngineeringXi’an Polytechnic UniversityXi’an710048China Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an710049China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Non-equilibrium Condensed Matter and Quantum Engineering Laboratory The Key Laboratory of Ministry of EducationSchool of ScienceXi’an Jiaotong UniversityXi’an710049China Department of Neurology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710061China

Plasmonic surface of flexible multilayered nanofibers possesses special superiority for the surface-enhanced Raman scattering(SERS)sensing of molecules and microbial ***,the fabrication of flexible plasmonic nanofibers with high sensitivity and reproducibility is ***,we report a smart strategy for fabricating flexible plasmonic fibers,in which compact and homogeneous gold nanoparticles(Au NPs)are in-situ grown on the high-curvature surface of multilayered fibers of electrospun polyvinylidene fluoride(PVDF).Firstly,the surface of PVDF fibers is changed electrically,and Au seeds are deposited on the surface of PVDF fibers using electrostatic driving ***,a stable AuI_(4)−complex is formed employing coordination between I−and AuCl4−ions,which could decrease the reduction potential of AuCl4−and restrain the self-nucleation,and then the reduction reaction of AuI4−is initiated by introducing PVDF@Au seeds to pull down the barrier of potential ***,in-situ growth of AuNPs is generated on the high-curvature surface of PVDF nanofibers,and large-scale hotspots are generated by adjacent AuNPs coupling in the three-dimensional(3D)space of multilayered *** of PVDF@Au nanofibers also realizes the sensitive detection of thiram molecules(low limit of detection of 0.1 nM)and good reproducibility(relative standard deviation of 10.6%).Meanwhile,due to the multilayered construction of PVDF@Au nanofibers,a valid SERS signal on 3D surface of bacteria could be generated.3D distribution of hotspots on multilayered PVDF@Au nanofibers gives a clear advantage for SERS sensing of organic molecules and microbial cells.

关键词： electrospinning polyvinylidene fluoride(PVDF) in-situ growth of gold three-dimensional(3D)multilayered nanofibers flexible surface-enhanced Raman scattering(SERS)substrate bacteria sensing

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Biopolymers Applied to Packaging:A Brief Literature Review on Their Impact on Sustainability

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Non-Metallic Material science 2022年第2期4卷 4-14页

作者： Diogo Cardoso Rego Harrison Lourenço Corrêa Post-graduation Program in Manufacturing Engineering(PPGEM) Federal University of ParanáCity of CuritibaParanáStateBrazil Laboratory of Polymer Materials Department of Mechanical EngineeringFederal University of ParanáCity of CuritibaParanáStateBrazil

The replacement of fossil raw materials by renewable alternatives is imper***,biodegradable,and compostable polymers are options to be developed and *** in this concept,the present study evaluates whether biopolymers are sustainable alternatives to replace traditional polymers used in packaging,such as *** that end,a systematic literature review(SLR)was carried out on biopolymers applied to packaging,with an analysis of its *** sustainability criteria were adopted:a)Criteria for Developing Sustainable Packaging;b)Goals of Sustainable Development;and c)Circular Economy *** Methodology Section presents the state of the art of potential polymers for packaging and their characteristics related to the evaluation criteria adopted based on the *** data collection,it was observed that advanced obtaining techniques enable polymers economically and that,environmentally speaking,there is a positive consensus about some types of those ***,technological maturity and productive scale capacity are necessary to reduce costs in a competitive scenario with conventional polymers.

关键词： Packaging Biopolymers Sustainability Circular economy

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Local Changes in Protein Filament Properties Drive Large-Scale Membrane Transformations Involved in Endosome Tethering and Fusion

arXiv

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arXiv 2023年

作者： Ghosh, Ashesh Spkaowitz, Andrew J. Department of Chemical Engineering Stanford University StanfordCA94305 United States Biophysics Program Stanford University StanfordCA94305 United States Department of Materials Science & Engineering Stanford University StanfordCA94305 United States

Large-scale cellular transformations are triggered by subtle physical and structural changes in individual biomacromolecular and membrane components. A prototypical example of such an event is the orchestrated fusion of membranes within an endosome that enables transport of cargo and processing of biochemical moieties. In this work, we demonstrate how protein filaments on the endosomal membrane surface can leverage a rigid-to-flexible transformation to elicit a large-scale change in membrane flexibility to enable membrane fusion. We develop a polymer field-theoretic model that captures molecular alignment arising from nematic interactions with varying surface density and fraction of flexible filaments, which are biologically controlled within the endosomal membrane. We then predict the collective elasticity of the filament brush in response to changes in the filament alignment, predicting a greater than 20-fold increase of the effective membrane elasticity over the bare membrane elasticity that is triggered by filament alignment. These results show that the endosome can modulate the filament properties to orchestrate membrane fluidization that facilitates vesicle fusion, providing an example of how active processes that modulate local molecular properties can result in large-scale transformations that are essential to cellular survival. © 2023, CC BY.

关键词： Elasticity

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The Use of Bioethanol-Isooctane Blend and the Effect of its Molecular Properties on Si Engine Performance and Exhaust Emissions

SSRN

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SSRN 2022年

作者： Nanlohy, Hendry Y. Adiwidodo, Satworo Yamaguchi, Masaki Subagyo, Rachmat Suryanto, Heru Wardana, I.N.G. Ueda, Toishihisa Department of Mechanical Engineering Jayapura University of Science and Technology 99351 Indonesia Department of Mechanical Engineering State Polytechnic of Malang 65141 Indonesia School of Science for Open and Environmental Systems Keio University Join Program Center Teikyo University Tokyo 108-8345 Japan Department of Mechanical Engineering Lambung Mangkurat University 70123 Indonesia Department of Mechanical Engineering State University of Malang 65145 Indonesia Department of Mechanical Engineering Brawijaya University 65145 Indonesia

This paper experimentally investigates the effect of ignition timing on a spark-ignition engine using 50% isooctane and bioethanol as fuel. In addition, the atomic, bond, and bond angle properties of both fuel molecules were investigated. The engine tests were conducted on three different ignition timings at 9°, 12°, and 15° before the top dead center (BTDC) with the wide-open throttle at 3500 rpm to 7500 rpm. The result shows that ethanol has 8 non-rotatable and 1 rotatable atomic bond, while the isooctane bond has 23 non-rotatable bonds and 2 rotatable bonds. In addition, ethanol has a partial charge of δ+ 0.209 and δ- 0.395, which is larger than isooctane (i.e., δ+ 0.030, and δ- 0.063);on the other hand, isooctane has a bond angle of 121.1745° that is greater than ethanol, which is 110.0476°. The result shows that the unique molecular properties of ethanol and isooctane can increase the reactivity of the fuel molecules, thereby increasing the performance of the spark-ignition engine. The results also show that the modification to ignition timing gives the maximum effect occurring at 12° for BE50. Moreover, the BE50 produces environmentally friendly exhaust emissions, thus proving that BE50 has the potential to be used in spark-ignition engines. © 2022, The Authors. All rights reserved.

关键词： Paraffins

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Characterization of Ureolysis and Microbially Induced Calcium Carbonate Precipitation Under Different Incubation and Reaction Conditions

SSRN

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SSRN 2025年

作者： Joo, Hyun-Woo Fyfe, Matthew H. Verdú, Irene Rahmaninezhad, Seyed Ali Sales, Christopher M. Srubar, Wil V. Hubler, Mija H. Department of Civil Environmental and Architectural Engineering University of Colorado Boulder BoulderCO United States 1111 Engineering Drive – UCB 428 ECOT 441 BoulderCO80309-0422 United States Department of Civil Architectural and Environmental Engineering Drexel University PhiladelphiaPA United States Environmental Department Terracon Consulting Inc. The ColonyTX United States Department of Civil Environmental and Architectural Engineering Materials Science and Engineering Program University of Colorado Boulder BoulderCO United States Department of Biology

This study investigates the ureolysis and microbially induced calcium carbonate precipitation (MICP) characteristics of Sporosarcina pasteurii and Lysinibacillus sphaericus under varying incubation and reaction conditions. A series of batch MICP experiments were conducted to assess the effects of incubation duration and pH, bacterial cell density, and reagent (i.e., urea and calcium ion) concentrations on ureolysis and CaCO3 precipitation characteristics. The findings indicate that both bacteria exhibit higher urease activity after 24 hours of incubation compared to 48 hours, regardless of incubation pH. S. pasteurii exhibits maximum specific urease activity at an alkaline pH (pH 9.0), whereas L. sphaericus reaches peak activity at a neutral pH (pH 7.2). Across six incubation conditions for each bacterium, S. pasteurii exhibits greater sensitivity in specific urease activity, while L. sphaericus maintains a more consistent ureolysis performance. In terms of cell density, a lower OD600 (~0.1) enhances specific urease activity and early-stage mineralization efficiency, whereas a higher OD600 (~1.0) accelerates overall CaCO3 precipitation, enhances terminal-stage mineralization efficiency, and promotes the prolonged presence of vaterite. High reagent concentrations (1.0 and 1.5 M) enhance specific urease activity and CaCO3 precipitation rates and lead to over 93% of vaterite formation, while low reagent concentration (0.3 M) favors calcite-dominant precipitation over time. These findings provide insights into evaluating and optimizing MICP performance under varying incubation and reaction conditions. © 2025, The Authors. All rights reserved.

关键词： Carbonation

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Predicting Defect Stability and Annealing Kinetics in Two-Dimensional PtSe2 Using Steepest Entropy Ascent Quantum Thermodynamics

arXiv

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arXiv 2022年

作者： Younis, Aimen Baniasadi, Fazel von Spakovsky, Michael R. Reynolds, William T. Mechanical Engineering Department Virginia Tech BlacksburgVA24061 United States Materials Science Engineering Department Virginia Tech BlacksburgVA24061 United States Center for Energy Systems Research Mechanical Engineering Department Virginia Tech BlacksburgVA24061 United States Materials Science Engineering Department Virginia Tech BlacksburgVA24061 United States

The steepest-entropy-ascent quantum thermodynamic (SEAQT) framework was used to calculate the stability of a collection of point defects in 2D PtSe2 and predict the kinetics with which defects rearrange during thermal annealing. The framework provides a non-equilibrium, ensemble-based framework with a self-consistent link between mechanics (both quantum and classical) and thermodynamics. It employs an equation of motion derived from the principle of steepest entropy ascent (maximum entropy production) to predict the time evolution of a set of occupation probabilities that define the states of a system undergoing a non-equilibrium process. The system is described by a degenerate energy landscape of eigenvalues, and the entropy is found from the occupation probabilities and the eigenlevel degeneracies. Scanning tunneling microscopy was used to identify the structure and distribution of point defects observed experimentally in a 2D PtSe2 film. A catalog of observed defects includes six unique point defects (vacancies and anti-site defects on Pt and Se sub-lattices) and twenty combinations of multiple point defects in close proximity. The defect energies were estimated with density functional theory (DFT), while the degeneracies, or density of states, for the 2D film with all possible combinations or arrangements of cataloged defects was constructed using a non-Markovian Monte-Carlo approach (i.e., the Replica-Exchange-Wang-Landau algorithm [1]) with a q-state Potts model. The energy landscape and associated degeneracies were determined for a 2D PtSe2 film two molecules thick and 30 × 30 unit cells in area (total of 5400 atoms). The SEAQT equation of motion was applied to the energy landscape to determine how an arbitrary density and arrangement of the six defect types evolve during annealing. Two annealing processes were modeled: heating from 77 K (−196◦C) to 523 K (250◦C) and isothermal annealing at 523 K. The SEAQT framework predicted defect configurations, which wer

关键词： Point defects

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Characterization of Novel Lignocellulosic Spinifex littoreus Fibers and Their Composites

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Journal of Bionic engineering 2020年第2期17卷 393-404页

作者： Milan Soosai Christopher Thankian Winowlin Jappes Jebas Thangiah Rajini Nagarajan Mayandi Kalimuthu Sikiru Oluwarotimi Ismail Faruq Mohammad Department of Mechanical Engineering Cape Institute of TechnologyLevengipuramTirunelveli 627114Tamil NaduIndia Department of Mechatronics Engineering Kamaraj College of Engineering&Technology VellakulamMadurai dist-622701Tamil NaduIndia Centre for Composite Materials Department of Mechanical EngineeringKalasalingam UniversityKrishnankoilVirudhunagar 626126Tamil NaduIndia Centre for Engineering Research Department of EngineeringSchool of Engineering and Computer ScienceUniversity of HertfordshireHatfieldHertfordshire AL109ABUK Surfactants Research Chair Department of ChemistryCollege of ScienceKing Saud UniversityRiyadh 11451Kingdom of Saudi Arabia

This innovative work presents mechanical,physical and chemical characterization and analysis of newly extracted fiber from naturally resourced plant stem,named Spinifex littoreus fibers(SLF).This is a novel natural,biodegradable and sustainable reinforcement for an improved ***,the chemical constituents of SLF,such as cellulose,lignin,moisture and wax content were *** raw SLF surfaces were modified by chemical treatment with sodium hydroxide(NaOH),calcium hydroxide(Ca(OH)2)and silane.A polyester matrix was reinforced with all the treated SLF,before the mechanical properties(tensile strengths)of the composites were *** all the surface chemically treated SLF/polyester composite samples,the Ca(OH)2 treated sample exhibited the highest tensile *** microscopic examination was carried out to validate this ***,this analysis established the mechanism of failure of the tensile fractured composite samples,using Scanning Electron Microscope(SEM),among other techniques.

关键词： cellulosic fiber Spinifex littoreus fibers XRD FTIR SEM tensile strength

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ET-AL: entropy-targeted active learning for bias mitigation in materials data

arXiv

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arXiv 2022年

作者： Zhang, Hengrui Chen, Wei Wayne Rondinelli, James M. Chen, Wei Department of Mechanical Engineering Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States

Growing materials data and data-driven informatics drastically promote the discovery and design of materials. While there are significant advancements in data-driven models, the quality of data resources is less studied despite its huge impact on model performance. In this work, we focus on data bias arising from uneven coverage of materials families in existing knowledge. Observing different diversities among crystal systems in common materials databases, we propose an information entropy-based metric for measuring this bias. To mitigate the bias, we develop an entropy-targeted active learning (ET-AL) framework, which guides the acquisition of new data to improve the diversity of underrepresented crystal systems. We demonstrate the capability of ETAL for bias mitigation and the resulting improvement in downstream machine learning models. This approach is broadly applicable to data-driven materials discovery, including autonomous data acquisition and dataset trimming to reduce bias, as well as data-driven informatics in other scientific domains. Copyright © 2022, The Authors. All rights reserved.

关键词： Data acquisition

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An experimental study on compaction behavior of lateritic soils treated with quarry dust based geopolymer cement

Journal of Solid Waste Technology and Management

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Journal of Solid Waste Technology and Management 2021年第1期47卷 104-119页

作者： Onyelowe, Kennedy Chibuzor Van, Duc Bui Idrees, Mohammed Oludare Onyia, Michael E. Dao-Phuc, Lam Onyelowe, Favour Deborah A. Amhadi, Talal Sosa, Felix Eberemu, Adrian Salahudeen, A. Bunyamin Osinubi, Kolawole Orji, Francis Igboayaka, Clifford Ikpa, Chidozie Van, Manh Nguyen Ugorji, Benjamin Ibe, Kizito Xuan, Manh Nguyen Department of Civil Engineering Michael Okpara University of Agriculture P.M.B. 7267 Abia State Umudike Umuahia440109 Nigeria Research Group of Geotechnical Engineering Construction Materials and Sustainability Hanoi University of Mining and Geology Hanoi Viet Nam Department of Civil Engineering Faculty of Engineering Alex Ekwueme Federal University Ndufu-Alike Ikwo Ebonyi State Nigeria Department of Mechanical and Civil Engineering Faculty of Engineering Kampala International University Western Campus Ishaka Uganda Faculty of Civil Engineering Research Group of Geotechnical Engineering Construction Materials and Sustainability Hanoi University of Mining and Geology Hanoi Viet Nam Geospatial Information Science Research Lab Department of Civil Engineering Faculty of Engineering University Putra Malaysia Serdang Malaysia Department of Civil Engineering Faculty of Engineering University of Nigeria Nsukka Nigeria Faculty of Civil Engineering University of Transportation Technology Hanoi Viet Nam Department of Biotechnology Ebonyi State University Ebonyi State Abakaliki Nigeria University of Quebec Montreal Canada Department of Civil Engineering National Autonomous University of Mexico Mexico City Mexico Department of Civil Engineering Ahmadu Bello University Kaduna Zaria Nigeria Department of Civil Engineering Faculty of Engineering University of Jos Nigeria Department of Mechanical Engineering Michael Okpara University of Agriculture Umudike Nigeria Department of Agricultural and Bioresources Engineering Michael Okpara University of Agriculture P.M.B. 7267 Abia State Umudike Umuahia440109 Nigeria Department of Civil Engineering Faculty of Engineering Alex Ekwueme Federal University Ndufu-Alike Ikwo Ebonyi State Nigeria Department of Civil Engineering Michael Okpara University of Agriculture P.M.B. 7267 Abia State Umudike Umuahia440109 Nigeria

Due to the scarcity of well-graded gravel materials, lateritic soils are widely used for road construction in tropic areas. However, lateritic soils often do not meet the strict requirement for subgrade and need to be improved to be used as construction material. Among several approaches used to enhance the engineering properties of lateritic soils, the use of industrial waste materials, such as fly ash, granulated blast furnace slag, is of particular interest to the construction industry as a potential replacement material for Portland cement in soil stabilization. Meanwhile, some effort has been made to study the use of quarry dust in stabilizing lateritic soils. The present work aims at assessing the compaction characteristics of three different types of lateritic soils, treated with quarry dust based geopolymer cement. A systematic study by varying the proportion of geopolymer cement was carried out. Test results show that the soil dry density substantially increased while the corresponding optimal moisture content decreased with the amount of geopolymer cement under varying compactive effort. © 2021 Widener University School of Civil engineering. All rights reserved.

关键词： Portland cement

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Green‑Solvent Processed Blade‑Coating Organic Solar Cells with an Efficiency Approaching 19%Enabled by Alkyl‑Tailored Acceptors

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Nano-Micro Letters 2023年第12期15卷 449-462页

作者： Hairui Bai Ruijie Ma Wenyan Su Top Archie Dela Pea Tengfei Li Lingxiao Tang Jie Yang Bin Hu Yilin Wang Zhaozhao Bi Yueling Su Qi Wei Qiang Wu Yuwei Duan Yuxiang Li Jiaying Wu Zicheng Ding Xunfan Liao Yinjuan Huang Chao Gao Guanghao Lu Mingjie Li Weiguo Zhu Gang Li Qunping Fan Wei Ma State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China Jiangsu Engineering Research Center of Light‑Electricity‑Heat Energy‑Converting Materials and Applications School of Materials Science and EngineeringChangzhou UniversityChangzhou 213164People’s Republic of China Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education/National Engineering Research Center for Carbohydrate Synthesis Jiangxi Normal University99 Ziyang AvenueNanchang 330022People’s Republic of China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityKowloon 999077Hong KongPeople’s Republic of China School of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloon 999077Hong KongPeople’s Republic of China Advanced Materials Thrust Function HubThe Hong Kong University of Science and TechnologyNanshaGuangzhouPeople’s Republic of China School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054People’s Republic of China Xi’an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials State Key Laboratory of Fluorine&Nitrogen ChemicalsXi’an Modern Chemistry Research InstituteXi’an 710065People’s Republic of China

Power-conversion-efficiencies(PCEs)of organic solar cells(OSCs)in laboratory,normally processed by spin-coating technology with toxic halogenated solvents,have reached over 19%.However,there is usually a marked PCE drop when the bladecoating and/or green-solvents toward large-scale printing are used instead,which hampers the practical development of ***,a new series of N-alkyl-tailored small molecule acceptors named YR-SeNF with a same molecular main backbone are developed by combining selenium-fused central-core and naphthalene-fused *** to the N-alkyl engineering,NIR-absorbing YR-SeNF series show different crystallinity,packing patterns,and miscibility with polymeric *** studies exhibit that the molecular packing,crystallinity,and vertical distribution of active layer morphologies are well optimized by introducing newly designed guest acceptor associated with tailored N-alkyl chains,providing the improved charge transfer dynamics and stability for the PM6:L8-BO:YRSeNF-based *** a result,a record-high PCE approaching 19%is achieved in the blade-coating OSCs fabricated from a greensolvent o-xylene with high-boiling ***,ternary OSCs offer robust operating stability under maximum-power-point tracking and well-keep>80%of the initial PCEs for even over 400 *** alkyl-tailored guest acceptor strategy provides a unique approach to develop green-solvent and blade-coating processed high-efficiency and operating stable OSCs,which paves a way for industrial development.

关键词： Alkyl-tailored guest acceptors Blade-coating Green solvent processing Stability Organic solar cells

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