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Study on Dispersion Characteristics of HwBKP Hydrophobized by Repeated Gas Grafting in Polypropylene

Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2023年第2期55卷 59-66页

作者： Shin, Yoo-Rim Noh, Kyu-Hwan You, Ha-Un Kim, Hyoung-Un Lee, Jin-Sol Ryu, Jeong-Yong Department of Paper Science & Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of Department of Paper Material Science & Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of

This study investigated the fiber dispersion characteristics and physical property changes of HwBKP-PP composites through repeated hydrophobization and recycling of cellulose fiber. The gas-grafted paper was disintegrated and then gas-grafted again to achieve uniform dispersion of the cellulose fibers with PP. With each gas grafting repetition, the interfacial affinity between the hydrophobized fibers and PP improved, leading to enhanced tensile strength and melt flow index of the HwBKP-PP composite material due to the improved fiber dispersibility. However, recycling of hydrophobic paper resulted in the loss of fines in the recycled paper, so that increase in average fiber length caused fiber agglomeration, resulting in poor dispersibility, and subsequently decreasing the tensile strength and melt flow index of the composite. © 2023 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Gases

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Investigating Niobium Coating Removal Techniques from Tool Steel Substrates 8th

Investigating Niobium Coating Removal Techniques from Tool S...

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8th installment of the REWAS conference series held at the TMS Annual Meeting and Exhibition focuses on circular economy for the energy transition, 2025

作者： Gupta, Akanksha Mishra, Brajendra Department of Material Science and Engineering Worcester Polytechnic Institute 100 Institute Rd WorcesterMA01609 United States

ISBN: (纸本)9783031808913

NiobiumNiobium is a critical and strategic metal with high economic importance in various industriesIndustries like aerospace, defense, and healthcare sectors, as well as due to its limited supply risk. Brazil accounts for nearly 90% of total niobiumNiobium production. It is necessary to use secondary resources to meet global niobiumNiobium needs and contribute to circular economyCircular economy. One such secondary source for niobiumNiobium is in the form of metal coating for applications including chemical equipment’s, aerospace components, and biomedical implants due to its superior corrosion resistance, biocompatibility, and high-temperature properties. The objective is the efficient removal of niobiumNiobium coating without affecting the steel substrate. Several coating removalCoating removal processes are reviewed with prime focus on electrochemical methods which are accompanied by empirical results. The material characteristics of the bimetallic compositeBimetallic composite are first analyzed to check the thickness of the coating, composition of coating and substrate, and interdiffusion interface in order to investigate the most efficient coating removalCoating removal process. Chemical leachingLeaching and electrochemical coating removalCoating removal of niobiumNiobium is investigated in alkaline medium, and the electrochemical analysis is conducted using open-circuit measurements and potentiodynamic behaviorPotentiodynamic behavior of pure niobiumNiobium anodes. Thermal and mechanical methods for niobiumNiobiumCoating removal are also evaluated. Metallic niobiumNiobium coating can be removed from steel substrate by alkaline leachingLeaching in the form of soluble metal niobiumNiobium complex, oxidized to niobiumNiobium pentoxide at high temperatures, or removed mechanically by abrasive blasting. © The Minerals, Metals & materials Society 2025.

关键词： Corrosion resistance

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Dominance of Neural Networks in Additive Manufacturing Surface Roughness Control 4

Dominance of Neural Networks in Additive Manufacturing Surfa...

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4th IEEE International Maghreb Meeting of the Conference on sciences and Techniques of Automatic Control and Computer engineering, MI-STA 2024

作者： Abdulshahed, A.M. Wafa, Fatma Misurata University Department of Electrical and Electronic Engineering Misurata Libya Misurata University Department of Material Science Misurata Libya

ISBN: (纸本)9798350372632

This article examines the prediction of surface roughness control in additive manufacturing by comparing Linear Regression and Neural Network models. Through K-means clustering, we identify four clusters in the data, each associated with specific 3D printing parameters. Within each cluster, we analyze the factors influencing surface roughness and power efficiency. The primary objective is to forecast a target variable, considering metrics such as R-squared, Mean Squared Error, and correlation coefficient. Our research demonstrates that both Linear Regression and Neural Network models exhibit strong predictive capabilities, with the Neural Network outperforming the Linear Regression model. The Neural Network demonstrates superior performance metrics, reduced Mean Squared Error, and greater resilience to outliers. These results underscore the effectiveness of Neural Networks in achieving precision and identifying nonlinear patterns in surface roughness prediction. Thus, emphasizing the significance of employing advanced machine learning techniques, such as Neural Networks, in similar domains. © 2024 IEEE.

关键词： Surface roughness

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Modeling, simulation and analysis of the input climat parameter effect on the photovoltaic panel 2

Modeling, simulation and analysis of the input climat parame...

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2nd International Conference on Energy Transition and Security, ICETS 2023

作者： Chaib, Mesaouda Abdeldjalil, Dahbi Benatillah, Ali Hachemi, Nadir Sakher, Elfahem Ben Abdelkarim, Bouchra Laboratory of Leesi Department of Material Science Adrar University Adrar Algeria Laboratory of Lddi University of Adrar Department of Electrical Engineering Adrar Algeria Laboratory of Saharan Natural Resources Department of Material Science Adrar University Adrar Algeria University Adrar Department of Material Science Adrar Algeria

ISBN: (纸本)9798350372182

This paper presents a Simulink model of a solar panel. The model is utilized to analyze the effects of changing external parameters on the panel's operation. Radiation and temperature are the parameters analyzed. It was observed that variations in input climate parameters influence the external parameters and characteristics of the photovoltaic panel. The results demonstrate that increasing temperature reduces the open-circuit voltage of the photovoltaic panel. In contrast, elevating solar irradiance results in a higher short circuit current. © 2023 IEEE.

关键词： Simulink

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Progress and prospects of chiral nanomaterials for biosensing platforms

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Rare Metals 2024年第6期43卷 2469-2497页

作者： Yu-Cheng Ouyang Bong-Jun Yeom Yuan Zhao Wei Ma School of Food Science and Technology State Key Laboratory of Food Science and ResourcesJiangnan UniversityWuxi 214122China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnanUniversityWuxi214122China Department of Chemical Engineering Hanyang UniversitySeoul04763RepublicofKorea

Chiral nanomaterials have distinct chiroptical properties of preferential interactions to circularly polarized ***-based biosensors have emerged for detection of biomolecules,ions and cells in recent *** review provides an extensive overview of biosensors based on chiral nanomaterials,starting with approaches to chiral nanomaterials construction in terms of fabrication *** of chiral nanomaterials and their biosensor applications is presented for different material types,with special emphasis on the role and importance of material properties and signal generation in *** assessed the technological prospects of the emerging fields of chiral construction,circularly polarized luminescence,Raman optical activity and so on along with their current *** venues for future research on chiral nanomaterials in fabrication,biosensing,disease diagnosis and treatment are also presented in the review.

关键词： Chiral nanomaterials Circular dichroism Biosensors

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Polaron interfacial entropy as a route to high thermoelectric performance in DAE-doped PEDOT:PSS films

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National science Review 2024年第3期11卷 259-270页

作者： Jiajia Zhang Caichao Ye Genwang Wei Liang Guo Yuhang Cai Zhi Li Xinzhi Wu Fangyi Sun Qikai Li Yupeng Wang Huan Li Yuchen Li Shuaihua Wang Wei Xu Xuefeng Guo Wenqing Zhang Weishu Liu Department of Materials Science and Engineering Southern University of Science and Technology Academy for Advanced Interdisciplinary Studies and Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences College of Chemistry and Molecular Engineering National Biomedical Imaging Centre Peking University Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology

Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies. However, the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly（3,4-ethylenedioxythiophene）-poly（4-styrenesulfonate）) thin film by using photochromic diarylethene（DAE） dopants coupled with UV-light modulation. With a 10-fold enhancement of the thermopower from 13.5 μV K-1to 135.4 μV K-1and almost unchanged electrical conductivity, the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28 μW m-1K-2from an original value of 6.78 μW m-1K-2. The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling. Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.

关键词： thermoelectric PEDOT: PSS interfacial occupied entropy resonant coupling UV-light modulation

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Effect of testing temperature on the impact-sliding wear behaviour of a 316L austenitic stainless steel

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materials Today: Proceedings 2023年 81卷 81-86页

作者： Gumuslu, Tufan Kaba, Mertcan Atar, Erdem Cimenoglu, Huseyin Department of Material Science and Engineering Gebze Technical University Gebze Kocaeli 41400 Turkey Department of Metallurgy and Materials Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey

In this study impact-sliding wear performance of a 316L austenitic stainless steel (ASS), having widespread usage in various engineering applications under complex loading conditions, has been examined at room temperature (RT) and 180 °C under contact pressures as high as 2.5 GPa. Impact-sliding wear tests were carried out against 10 mm diameter 52100 grade bearing steel balls for 1000 loading cycles. The wear tracks formed on the samples were then examined by a 2-D contact profilometer, an energy dispersive X-ray spectroscopy (EDX) equipped scanning electron microscope (SEM) and a Raman spectroscopy. Despite the detection of tribo-oxides on the impact and sliding zones, mainly plasticity dominated wear was operative at RT. Tests conducted at RT and 180 °C favoured hematite + magnetite and hematite type tribo-oxides on the worn surface, respectively. The increase of test temperature to 180 °C caused an increase in the wear rate at the impact zone but a decrease at the sliding zone of the wear track. While the former was the result of softening of the ASS, the latter was due to the formation of thicker tribo-oxides on the contact surface. Although the reduction of sliding wear rate above a critical temperature (300–400 °C) was previously associated with the formation of protective tribo-oxides on the worn surfaces, this study revealed that higher contact pressure reduces this critical temperature via increasing the frictional heating under sliding contact. Thus, contact pressure of 2.5 GPa favoured the formation of protective tribo-oxides at a lower temperature (i.e. 180 °C) for the examined ASS/bearing steel tribo-pair. © 2023

关键词： Austenitic stainless steel

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Incipient sliding of adhesive contacts

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Friction 2022年第6期10卷 963-976页

作者： Francesc PÉREZ-RÀFOLS Lucia NICOLA Department of Industrial Engineering University of PadovaPadua I-35131Italy Department of Material Science and Engineering Delft University of TechnologyDelft 2628 CN the Netherlands

A model is proposed herein to investigate the incipient sliding of contacts in the presence of both friction and adhesion,where the interfacial response is modeled based on traction-separation laws.A Maugis-like parameter is defined to characterize the response in the tangential ***,the model is used to investigate the contact between a smooth cylinder and a flat body,where adhesion-friction interactions are strong.A range of behaviors are observed when a tangential displacement is imposed:When the parameter is low,the contact pressure exhibits a relatively constant profile;when it is high,a pressure spike is observed at the edge of the *** difference is caused by a significant interface compliance in the former case,which limits the amount of *** results for the mid-range values of the Maugis-like parameter can qualitatively replicate various experiments performed using polydimethylsiloxane(PDMS)balls.

关键词： incipient sliding adhesion traction-separation laws

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Silk-derived peptide nanospirals assembled by self-propelled wormlike filaments

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Nano Research 2023年第1期16卷 1414-1420页

作者： Huijuan Wen Jinrong Yao Xin Chen Shengjie Ling Zhengzhong Shao State Key Laboratory of Molecular Engineering of Polymers Advanced Material LaboratoryDepartment of Macromolecular ScienceFudan UniversityShanghai 200433China School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China

Swirl-like nanospiral is a common structure found in free-swimming biological systems,such as microtubules and actin filaments or slender *** is desired for artificially designed dynamic ***,the spiral formation has rarely been reported in both engineered peptides and regenerated ***,we report that such a unique assembly behavior can be achieved by using a fusion peptide consisting of a silk-derived peptide(i.e.,GAGAGAGY)and a hydrophobic,photoresponsive azobenzene(Azo)*** this fusion structure,GAGAGAGY acts as a domain that spontaneously forms an elongated filament in an aqueous solution,while Azo acts as a"light-operated switch"that can undergo photoinduced isomerization to modulate the self-propulsion forces and assembly *** this design,the critical factors that affect the assembly of Azo-GAGAGAGY filament,including(i)length and flexibility of filaments;(ii)propulsion,and(iii)excluded volume interactions force the tip of the filament to wind up,can be regulated to realize the spiral *** addition,the configurations of Azo-GAGAGAGY filaments,such as straight nanoribbons,wavy nanoribbons,single-circle spiral,and multiple-circle spiral,can be facilely mediated by changing the preparation procedure,concentration,and pH value of Azo-GAGAGAGY solution,as these changes have significant influences on self-propulsion *** findings can help in the better understanding of nonequilibrium thermodynamics and collective behavior of biological *** findings can be used as a guideline for the designs of nanoactuators,microswimmers,transformable microrobots,and intelligent drug carriers.

关键词： nanospiral silk-derived peptide self-assembly worm-like filaments photoinduced isomerization

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Effect of ortho-phosphoric acid doping concentration on electrochemical properties of polyaniline coated low carbon steel

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materials Today: Proceedings 2022年 56卷 3797-3802页

作者： Nazirkar, Nimish P. Gadikar, Apurva A. Umredkar, Shakti Deshpande, Pravin P. Department of Metallurgy and Material Science College of Engineering M.S. Pune411005 India

Conducting polyaniline-based paint formulation is prepared and coated on the low carbon steel samples. Characterization of conducting polyaniline showed the characteristic peak at 327 nm and a weak broad peak at 608 nm under UV–Vis's spectrometry. The effect of doping level on electrochemical performance of conducting polyaniline painted low carbon steel was studied using ortho-phosphoric acid as a dopant. All polyaniline-based painted steel samples exhibited a shift in corrosion potential positively and a reduction in corrosion rate. However, the corrosion rate of 0.3 M ortho- phosphoric doped conducting polyaniline coated low carbon steel sample is found to be 0.01 mpy, significantly lower than that of painted and unpainted samples. Higher impedance modulus, coating resistance, and lower coating capacitance confirm the corrosion resistance of 0.3 M ortho-phosphoric doped conducting polyaniline coated low carbon steel sample in a neutral medium. It reveals that doping plays an essential role in the electrochemical performance of the painted steel samples and protects the steel by a barrier and anodic protection. © 2022

关键词： Low carbon steel

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