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RSC Mechanochemistry 2024年第5期1卷 465-476页

作者： Aman Shukla Akshay Gaur Shivam Dubey Rahul Vaish School of Mechanical & Materials Engineering Indian Institute of Technology Mandi Himachal Pradesh 175005 India rahul@iitmandi.ac.in Department of Material Science & Engineering Indian Institute of Technology Kanpur Uttar Pradesh 208016 India

Ball milling stands as a versatile and widely used technique that involves the mechanical grinding of solid materials via ball mills. Conventionally employed for synthesizing nanomaterials and complex compounds, this method has now been harnessed directly for catalysis due to its capability for surface charge separation. Herein, in the present study, we have explored the potential of ball milling to activate material with low piezoelectric coefficient for catalysis by demonstrating the ball-milling-induced mechano-catalytic activity of SrTiO 3 (STO) nanoparticles for the degradation of toxic methylene blue (MB) dye. With the assistance of ball milling, STO nanoparticles (of 0.3 g dosage) were found capable of degrading 70% of 10 ppm MB dye at 400 rpm speed with 10 Zr balls in just 1 hour. A series of parametric studies were performed to analyze the effect of various process conditions, like catalyst dosage, initial concentration of dye, ball milling speed, and number of milling balls. Further, scavenging tests were carried out to detect the responsible reactive species for dye degradation. Moreover, the present ball milling process was compared with the trivial ultrasonication method where STO showed just 12% degradation in 1 hour. The results manifest the superiority of ball milling catalysis which not only offers precise control over reaction parameters but also encompasses scalability, simplicity, and better potential to conduct catalysis under environmentally benign conditions.

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Phase Composition and Thermophysical Performances for (Sm1-xYbx)3TaO7 Compounds Corresponding Author: Zhang Hongsong, Email:Zhsandchen@***

SSRN

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SSRN 2023年

作者： Haoming, Zhang Hongsong, Zhang Xiaoqin, Guo Nan, Wang Zefeng, Zhang Weiwei, Sang An, Tang Yongtao, Zhao Bo, Ren Keke, Guan Department of Mechanical Engineering Henan University of Engineering Zhengzhou451191 China School of Material Science and Engineering Zhengzhou University of Aeronautics Zhengzhou451191 China

To evaluate the influence of Yb2O3 on crystal-structure and thermophysical performances of Sm3TaO7, the (Sm1-xYbx)3TaO7 compounds were prepared using high-temperature calcining technology. Final analytical conclusions show that the synthesized compounds are of sole pyrochlore or fluorite crystal-structure, and the lattice-variation from pyrochlore to fluorite is found with increasing Yb2O3 fraction. Owing to the phonon scattering caused by substituting cation and disorder atomic arrangement, the heat-insulation of (Sm1-xYbx)3TaO7 oxides is improved, which meets to the requirements for thermal barrier coatings. The synthesized (Sm1-xYbx)3TaO7 oxides also present relatively high linear thermal expansion coefficients owing to the conjunct influence of ionic-radius and crystal-lattice energy. The addition of Yb2O3 also improves the crystal-constancy until 1200°C. © 2023, The Authors. All rights reserved.

关键词： Samarium compounds

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Effect of Boron Carbide and Graphite Particle on Coefficient of Friction in Hybrid Aluminum Metal Matrix Composite 1

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1st International Conference on Recent Advancements in materials science and Technology, ICRAMST 2024

作者： Brucely, Y. Rose, D. Deena Shaji, Y. Christabel Manivannan, S. Kannan, C. Ramesh Department of Mechanical Engineering SRM TRP Engineering College Tamil Nadu Irungalur India Department of Artificial Intelligence K Ramakrishnan College of Technology Tamil Nadu Samayapuram Trichy India Department of Chemistry Holy Cross College Tamil Nadu Kanyakumari Nagercoil India Center of Material Science Karpagam Academy of Higher Education Tamil Nadu Coimbatore India

ISBN: (数字)9783031699665

ISBN: (纸本)9783031699658

Lightweight materials, such as metal matrix composites (MMC), are becoming more important as their applications expand throughout the aerospace, automotive, and industrial sectors. In this study, an ultrasonic aided stir casting technique was used to create Aluminum 8011 (Al8011) that had been reinforced with varying amounts of boron carbide (3%, 5%, 7%, and 9%) and 2% graphite. mechanical and tribological characteristics of Al8011 hybrid MMCs were investigated as a function of carbide and graphite concentration. The mechanics of tool wear were analyzed and measured after being identified. Experiments on wear were carried out by applying varied loads while using a pin-on-disc wear tester. The number of experimental situations was reduced by using the response surface methodology, and mathematical models were developed to show the relationship between the important process factors, which were the weight % of B4C and graphite, as well as the load and sliding distance. The constructed model was put through its paces using the method of analysis of variance to see whether it was valid. The mathematical model that was constructed for the rate of wear was able to make predictions with a degree of confidence of 99.5%, and several helpful conclusions were made. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Boron carbide

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Excellent Energy Storage Performance Achieved in Sr(Sc0.5Nb0.5)O3-Doped Bi0.5Na0.5TiO3-Based Lead-Free Relaxor Ferroelectric Ceramics

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ACS Applied Energy materials 2024年第5期7卷 2030-2038页

作者： Liu, Jinnan Li, Da Zhao, Weichen Xu, Diming Shi, Zhongqi Liu, Wenfeng Su, Jinzhan Zhou, Tao Chen, Guohua Zhou, Di Electronic Materials Research Laboratory & Multifunctional Materials and Structures Key Laboratory of the Ministry of Education International Center for Dielectric Research School of Electronic Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Mechanical Behaviour of Materials Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Shaanxi Xi’an710049 China International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Electronic and Information Engineering Hangzhou Dianzi University Hangzhou310018 China Electronical Information Materials Devices Engineering Research Center of Ministry of Education Guangxi Key Laboratory of Information Materials School of Material Science and Engineering Guilin University of Electronic Technology Guilin541004 China

Dielectric energy storage ceramics have received significant attention as the primary component for high-pulse power capacitors. Currently, their development is limited by poor energy storage performance, which affects the miniaturization and lightweighting of electronic devices. In this study, a comprehensive optimization approach was adopted to enhance the storage performance (recoverable energy density Wrec and conversion efficiency η) of 0.8Bi0.5Na0.5TiO3-0.2NaNbO3 (BNT-NN) through component optimization design and repeated rolling process (RRP). A series of Sr(Sc0.5Nb0.5)O3 (SSN) was introduced into BNT-NN to modulate the phase structure and improve the relaxation properties. The repeated rolling process was applied to refine the grain and enhance the dense property to boost the breakdown of the electric field. Following the mentioned strategy, we have succeeded in simultaneously obtaining ultrahigh Wrec (∼7.22 J·cm-3) and outstanding η (∼95.32%) under 515 kV·cm-1 for 0.8(BNT-NN)-0.2SSN (RRP) ceramic. More importantly, the ceramic sample possesses outstanding stability over a wide range of temperatures (25-60 °C) and frequencies (1-100 Hz). This study proposes a viable route to better performance of dielectric ceramics for energy storage, and the outstanding performance of the 0.8(BNT-NN)-0.2SSN (RRP) ceramic indicates its promising applicability in high- and high-pulse-power electronic devices. © 2024 American Chemical Society.

关键词： Energy storage

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Advances in plastic waste-derived carbon nanomaterial for supercapacitor applications: Trends, challenges and prospective

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materials Today: Proceedings 2022年 67卷 1024-1032页

作者： Kumar Nayak, Samit Saurabh, S.M. Kar, Abhijeet Bhusan Sahoo, Bibhuti Kumar Sahoo, Naresh Kumar Sahoo, Prasanta Department of Mechanical Engineering Siksha ‘O’ Anusandhan Deemed to be University Bhubneswar 751030 India Department of Chemistry Environmental Science and Technology Program Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India

Plastic is one of the most serious environmental threats. Plastic is a non-biodegradable substance that releases various hazardous compounds that cause cancer and other serious illnesses, as well as endangering aquatic life and polluting the environment. The use of waste plastic in the production of a variety of nanomaterials can protect people and the surroundings from the dangers of plastic waste, while simultaneously producing useful compounds for other applications. This critical review summarizes the current plastic waste circumstances investigation of the worldwide energy crisis, as well as a recent development in the structural forms and presents a situational investigation of common plastic waste into valuable carbon-based nanomaterials (CNMs) like carbon quantum dots, carbon nanoparticles, Carbon nanotube (CNT), graphene, and 3D porous carbon, which can be used as supercapacitor electrode materials. The impact of various structural alterations on CNMs on the charge storage mechanism has been widely addressed for the manufacture of high-performance electrode materials for supercapacitors, and their future potential. We think that our review reveals a promising long-term strategy for using plastic waste for supercapacitor electrode applications, as well as a new way for humanity's future energy and waste management challenges. © 2022

关键词： Supercapacitor

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Folding angle and wing flexibility influence the flight performance of origami winged fruits

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Nonlinear Dynamics 2024年第13期112卷 10995-11011页

作者： Cai, Jing-Fang Hsu, Ya-Chun Yen, Yu-Chen Lee, Yun-Chung Peyton, Bernie Huang, Mei-Jiau Yu, Hon-Tsen Juang, Jia-Yang Department of Mechanical Engineering National Taiwan University Taipei106319 Taiwan Department of Life Science National Taiwan University Taipei106319 Taiwan Berkeley CA United States Program in Nanoengineering and Nanoscience Graduate School of Advanced Technology National Taiwan University Taipei106319 Taiwan Degree Program of Genome and Systems Biology National Taiwan University Taipei106319 Taiwan

Winged fruits possess a unique flight mechanism relying on simple geometric structures rather than neuromuscular control. This study proposes an innovative approach using origami techniques to create three-winged model fruits, serving as a proxy for understanding the flight dynamics of natural winged fruits. Paper is employed to simulate inherent wing flexibility, with the option to add plastic frames for rigidity. We comprehensively investigate the free fall motion of both rigid and flexible winged fruits through experimental and numerical analyses. Velocity–time curves reveal a three-stage descent pattern—acceleration, deceleration, and steady states. The overshoot phenomenon is attributed to rapid lift increase due to leading-edge vortices attaching stably to the wings. This insight sheds light on aerodynamics governing fruit flight. Compared with rigid wings, flexible wings exhibit two key properties—slower descent and higher self-orienting capability—that facilitate a more stable and longer-distance dispersal of seeds under crosswind conditions. Our study demonstrates the potential benefits of flexible wings in natural seed distribution. This study advances our understanding of winged fruit flight dynamics, utilizing origami as a powerful tool for biomimetic investigations. The findings have broad implications, from improving aerodynamic designs to developing efficient micro air vehicles and electronic microfliers, and understanding seed dispersal evolution. Graphical abstract: (Figure presented.). © The Author(s), under exclusive licence to Springer Nature B.V. 2024.

关键词： Fruits

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A cost-effective method for bulge prediction in two point incremental forming 24

A cost-effective method for bulge prediction in two point in...

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24th International ESAFORM Conference on material Forming, ESAFORM 2021

作者： Shin, Jaekwang Bansal, Ankush Cheng, Randy Taub, Alan Banu, Mihaela Department of Mechanical Engineering University of Michigan United States Department of Material Science and Engineering University of Michigan United States

ISBN: (纸本)9782870193020

Accurate prediction of the defects occurring in incrementally formed parts has been gaining attention in recent years. This interest is because accurate predictions can overcome the limitation in the advancement of incremental forming in industrial-scale implementation, which has been held back by the increase in the cost and development time due to trial and error methods. The finite element method has been widely utilized to predict the defects in the formed part, e.g., bulge. However, the computation time of running these models and their mesh-size dependency in predicting the forming defects represent barriers in adopting these models as part of CAD-FEM-CAE platforms. Thus, robust analytical and data-driven algorithms must be developed for a cost-effective design of complex parts. In this paper, a new analytical model is proposed to predict the bulge location and geometry in two point incremental forming of an aerospace aluminum alloy AA7075-O for a 67° truncated cone. First, the algorithm calculates the region of interest based on the part geometry. A novel shape function and weighted summation method are then utilized to calculate the amplitude of the instability produced by material accumulation during forming, leading to a bulge on the unformed portion of the sample. It was found that the geometric profile of the part influences the shape function, which is a function created to incorporate the effects of process parameter and boundary condition. The calculated profile in each direction is finalized into one 3-dimensional profile, compared with the experimental results for validation. The proposed model has proven to predict an accurate bulge profile with 95% accuracy comparing with experiments with less than 5% computational cost of FEM modeling. © ESAFORM 2021 - 24th Inter. Conf. on Mat. Forming. All rights reserved.

关键词： Forecasting

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Fully rubbery synaptic transistors made out of all-organic materials for elastic neurological electronic skin

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Nano Research 2022年第2期15卷 758-764页

作者： Hyunseok Shim Seonmin Jang Jae Gyu Jang Zhoulyu Rao Jong-ln Hong Kyoseung Sim Cunjiang Yu Materials Science and Engineering Program University of HoustonHoustonTX 77204 USA Department of Chemistry Seoul National UniversitySeoul 08826Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Mechanical Engineering University of HoustonHoustonTX 77204 USA Department of Biomedical Engineering University of HoustonHoustonTX 77204USA Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204 USA Texas Center for Superconductivity University of HoustonHoustonTX 77204USA

Neurologic function implemented soft organic electronic skin holds promise for wide range of applications,such as skin prosthetics,neurorobot,bioelectronics,human-robotic interaction(HRI),***,we report the development of a fully rubbery synaptic transistor which consists of all-organic materials,which shows unique synaptic characteristics existing in biological *** synaptic characteristics retained even under mechanical stretch by 30%.We further developed a neurological electronic skin in a fully rubbery format based on two mechanoreceptors(for synaptic potentiation or depression)of pressure-sensitive rubber and an all-organic synaptic *** converting tactile signals into Morse Code,potentiation and depression of excitatory postsynaptic current(EPSC)signals allow the neurological electronic skin on a human forearm to communicate with a robotic *** collective studies on the materials,devices,and their characteristics revealed the fundamental aspects and applicability of the all-organic synaptic transistor and the neurological electronic skin.

关键词： synaptic transistor stretchable electronic skin all-organic

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High-entropy ceramics:Present status,challenges,and a look forward

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Journal of Advanced Ceramics 2021年第3期10卷 385-441页

作者： Huimin XIANG Yan XING Fu-zhi DAI Hongjie WANG Lei SU Lei MIAO Guojun ZHANG Yiguang WANG Xiwei QI Lei YAO Hailong WANG Biao ZHAO Jianqiang LI Yanchun ZHOU Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China New Energy Technology Engineering Laboratory of Jiangsu Province Nanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Institute of Functional Material College of Material Science and EngineeringDonghua UniversityShanghai 201620China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China College of Material Science and Engineering Shenzhen UniversityShenzhen 518060China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology CAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal *** in the infant stage,the emerging of this new family of materials has brought new opportunities for material design and property *** from metals,the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon *** from strengthening,hardening,and low thermal conductivity that have already been found in high-entropy alloys,new properties like colossal dielectric constant,super ionic conductivity,severe anisotropic thermal expansion coefficient,strong electromagnetic wave absorption,etc.,have been discovered in *** a response to the rapid development in this nascent field,this article gives a comprehensive review on the structure features,theoretical methods for stability and property prediction,processing routes,novel properties,and prospective applications of *** challenges on processing,characterization,and property predictions are also ***,future directions for new material exploration,novel processing,fundamental understanding,in-depth characterization,and database assessments are given.

关键词： high-entropy ceramics(HECs) processing structure properties applications

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Synthesis and Characterization of Highly Transparent and Superhydrophobic Zinc Oxide (ZnO) Film 2nd

Synthesis and Characterization of Highly Transparent and Sup...

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2nd International Conference on Functional material, Manufacturing and Performances, ICFMMP 2021

作者： Jaswal, Ashish Kishore, Kamal Singh, Amarjit Singh, Jarnail Dixit, Saurav Kumar, Kaushal Sinha, Manoj Kumar Department of Mechanical Engineering K.R. Mangalam University Gurgaon122103 India Department of Material Science and Engineering National Institute of Technology Hamirpur Hamirpur177005 India SOMC National Institute of Technology Hamirpur Hamirpur177005 India Division of Research & Innovation Uttaranchal University Dehradun India

ISBN: (纸本)9789811941467

This work represents the synthesization and functionalization of zinc oxide (ZnO) nanoparticles/films and investigated its superhydrophobic and optical properties. ZnO nanoparticles were prepared by precipitation method using sodium hydroxide (NaOH) as a precipitating agent. The functionalization of the ZnO nanoparticles was carried out to tailor its hydrophilic nature to hydrophobic. Mercaptotrimethoxysilane (MPMS) was also used for further modification of ZnO nanoparticles. Functionalized ZnO nanoparticles then mixed with polystyrene were passed through the rolling machine at a temperature of 200 °C. The required thin film was achieved after pressing the rolled thick film at 150 °C and 90 MPa. A scanning electron microscope was used to study the morphology of superhydrophobic film (SHF). The contact angle of the SHF was measured with the help of a tensiometer. Evaluation of optical properties of the prepared ZnO film was carried out using UV–visible spectrophotometry. An atomic force microscopy technique was used to illustrate the roughness of the film. Characterizations of SHF revealed that the film possesses the high optical transparency in visible range, which is almost similar to the bare glass. The antireflective film has provided an average transparency of 91.5%, comparable to the bare glass substrate 92% at a wavelength range of 320–750 nm. Moreover, this transparent and superhydrophobic film shows an average roughness of 27 nm with the highest water contact angle of 157°. The weight percentage of ZnO and MPMS found to significantly influence the contact angle, which governs the thin film’s superhydrophobicity. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Contact angle

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