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Functionally graded structure of a nitride-strengthened Mg_(2)Si-based hybrid composite

Journal of Magnesium and Alloys 2024年第3期12卷 1239-1256页

作者： Jeongho Yang Woongbeom Heogh Hogi Ju Sukhyun Kang Tae-Sik Jang Hyun-Do Jung Mohammad Jahazi Seung Chul Han Seong Je Park Hyoung Seop Kim Susmita Bose Amit Bandyopadhyay Martin Byung-Guk Jun Young Won Kim Dae-kyeom Kim Rigoberto CAdvincula Clodualdo Aranas Jr Sang Hoon Kim School of mechanical engineering Pusan National UniversityBusan 46241Republic of Korea department of mechanical Design engineering Hanyang UniversitySeoul 04763Republic of Korea Process research 3 Team LG Display Co.Ltd.PajuGyeonggi-do 10845Republic of Korea department of materials Science and engineering Chosun UniversityGwangju 61452Republic of Korea Institute of Well-Aging Medicare&Chosun University LAMP center Chosun UniversityGwangju 61452Republic of Korea Division of materials Science and engineering Hanyang UniversitySeoul 04763Republic of Korea department of mechanical engineering École de Technologie SupérieureMontrealQuebec H3C 1K3Canada Material&Component Convergence R&D center Korea Construction Equipment Technology InstituteGunsanJeollabuk-do 54002Republic of Korea School of mechanical and Aerospace engineering Nanyang Technological UniversitySingapore 639798Singapore Graduate Institute of Ferrous&Eco materials Technology Pohang University of Science and TechnologyPohangGyeongsangbuk-do 37673Republic of Korea Advanced Institute for materials research Tohoku UniversitySendai 980-8577Japan Institute for Convergence research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea School of mechanical and materials engineering Washington State UniversityPullmanWashington 99164USA School of mechanical engineering Purdue UniversityWest LafayetteIndiana 47907USA research Institute of Advanced Manufacturing Technology Korea Institute of Industrial TechnologyIncheon 21999Republic of Korea department of Macromolecular Science and engineering Case Western Reserve UniversityClevelandOhio 44106USA department of Chemical and Biomolecular engineering and Joint Institute for Advanced materials University of TennesseeKnoxvilleTennessee 37996USA center for Nanophase materials and Sciences Oak Ridge National LaboratoryOak RidgeTennessee 37830USA department of mechanical engineering University of New BrunswickFrederictonNew Brunswick E3B 5A3Cana

The ex-situ incorporation of the secondary SiC reinforcement,along with the in-situ incorporation of the tertiary and quaternary Mg_(3)N_(2) and Si_(3)N_(4) phases,in the primary matrix of Mg_(2)Si is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of N_(2) gas during laser powder bed *** is substantialized based on both the thermal diffusion-and chemical reactionbased metallurgy of the Mg_(2)Si–SiC/nitride hybrid *** study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive *** strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the Mg_(2)Si–SiC/nitride hybrid ***,the coefficient of friction of the hybrid composite exhibits a 309.3%decrease to–1.67 compared to–0.54 for the conventional nonreinforced Mg_(2)Si structure,while the tensile strength exhibits a 171.3%increase to 831.5 MPa compared to 485.3 MPa for the conventional *** outstanding mechanical behavior is due to the(1)the complementary and synergistic reinforcement effects of the SiC and nitride compounds,each of which possesses an intrinsically high hardness,and(2)the strong adhesion of these compounds to the Mg_(2)Si matrix despite their small sizes and low concentrations.

关键词： Laser powder bed fusion Mg_(2)Si-SiC/nitride hybrid composite Both the thermal diffusion-and chemical reaction-based metallurgy Functionally graded structure Compositional gradient Wear resistance.

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Thermo-Physical Potential of Recycled Banana Fibers for Improving the Thermal and mechanical Properties of Biosourced Gypsum-Based materials

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Journal of Renewable materials 2024年第4期12卷 843-867页

作者： Youssef Maaloufa Soumia Mounir Sara Ibnelhaj Fatima Zohra El Wardi Asma Souidi Yakubu Aminu Dodo Malika Atigui Mina Amazal Abelhamid Khabbazi Hassan Demrati Ahmed Aharoune National School of Architecture Agadir New ComplexIbn Zohr UniversityAgadirMorocco Energy Materials and Sustainable Development(EMDD)Center for WaterNatural ResourcesEnvironment and Sustainable Development(CERNE2D)Mohammed V UniversityRabatMorocco Thermodynamics and energetics Laboratory Faculty of ScienceIbn Zohr UniversityAgadirMorocco Architectural engineering department Najran UniversityNajranSaudi Arabia The Centre of Scientific and engineering research Najran UniversityNajranSaudi Arabia Physics department LPMAT LaboratoryFaculty of Sciences Ain ChockHassan II UniversityCasablancaMorocco

The development of bio-sourced materials is essential to ensuring sustainable construction;it is considered a locomotive of the green ***,it is an abundant material in our country,to which very little attention is being *** work aims to valorize the waste of the trunks of banana trees to be used in ***,the physicochemical properties of the fiber,such as the percentage of crystallization and its morphology,have been determined by X-ray diffraction tests and scanning electron microscopy to confirm the potential and the impact of the mode of drying on the quality of the banana fibers,with the purpose to promote the use of this material in ***,the results obtained with the gypsum matrix allowed us to note a preponderant improvement in the composite’s thermal properties thanks to the variation of the banana fiber ***,the impact of the nature of the banana fiber distribution(either fiber mixed in matrix or fiber series model)on the flexural and compressive strengths of the composites was *** results obtained indicate that the insulation gain reaches up to 40%.It depends on the volume fraction and type of distribution of the banana ***,the thermal inertia of the composites developed,represented by thermal diffusivity and thermal effusivity,was *** indicate a gain of 40%and 25%,respectively,in terms of thermal diffusivity and thermal effusivity of the developed composites compared to plaster *** the mechanical properties,the flexural strength depends on the percentage of the volume fraction of banana fibers used,and it can reach 20%more than the flexural strength of plaster;nevertheless,there is a significant loss in terms of the compressive strength of the studied *** results obtained are confirmed by the microstructure of the fiber *** fact,the morphology of the banana fibers was improved by the drying *** reduces the amorphous area an

关键词： Biosourced materials fiber banana flexural strength mechanical properties open-air drying plaster thermal properties waste management

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含能五唑阴离子及其衍生物的合成与性质研究进展

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engineering 2020年第9期6卷 1108-1119页

作者： Dominique R.Wozniak Davin G.Piercey department of materials engineering&department of mechanical engineering&purdue energetics research center Purdue UniversityWest LafayetteIN 47907USA

自2002年Christe等首次对五唑阴离子(cyclo-N5^-)进行质谱检测以来,这个唑类的最新成员就受到了越来越多的关注。由于不含碳和氢,cyclo-N5^-可以释放大量能量,同时分解为对环境友好的氮气。由于这些吸引人的特性,cyclo-N5^-和相关化合... 详细信息

自2002年Christe等首次对五唑阴离子(cyclo-N5^-)进行质谱检测以来,这个唑类的最新成员就受到了越来越多的关注。由于不含碳和氢,cyclo-N5^-可以释放大量能量,同时分解为对环境友好的氮气。由于这些吸引人的特性,cyclo-N5^-和相关化合物对于高能密度材料(high-energy-densitymaterial,HEDM)研究的发展至关重要。本文旨在提供有关cyclo-N5^-的所有研究的综合报告,重点是作为高能材料的cyclo-N5^-及其实验合成。本文包括以下内容:①cyclo-N5^-的历史意义:②cyclo-N5^-的前驱体;③以芳基五唑前驱体为重点的cyclo-N5^-合成路线:④影响cyclo-N5^-的稳定性的因素;⑤目前含能cyclo-N5^-化合物的高能性能:⑥未来有潜力的实验研究。本文全面总结了当前人们对cyclo-N5^-的了解,旨在进一步了解这种阴离子作为下一代强大而环保的炸药的潜力。

关键词：炸药五唑高氮化合物

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Fast and accurate machine learning prediction of phonon scattering rates and lattice thermal conductivity

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npj Computational materials 2023年第1期9卷 1367-1376页

作者： Ziqi Guo Prabudhya Roy Chowdhury Zherui Han Yixuan Sun Dudong Feng Guang Lin Xiulin Ruan department of mechanical engineering Purdue UniversityWest Lafayette 47907-2088 INUSA The Birck Nanotechnology center Purdue UniversityWest Lafayette 47907-2088 INUSA department of Mathematics Purdue UniversityWest Lafayette 47907-2088 INUSA

Lattice thermal conductivity is important for many applications,but experimental measurements or first principles calculations including three-phonon and four-phonon scattering are expensive or even *** learning approaches that can achieve similar accuracy have been a long-standing open *** recent progress,machine learning models using structural information as descriptors fall short of experimental or first principles *** study presents a machine learning approach that predicts phonon scattering rates and thermal conductivity with experimental and first principles *** success of our approach is enabled by mitigating computational challenges associated with the high skewness of phonon scattering rates and their complex contributions to the total thermal *** learning between different orders of phonon scattering can further improve the model *** surrogates offer up to two orders of magnitude acceleration compared to first principles calculations and would enable large-scale thermal transport informatics.

关键词： spite learning principles

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A Telepresence-Guaranteed Control Scheme for Teleoperation Applications of Transferring Weight-Unknown Objects

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1015-1025页

作者： Jinfei Hu Zheng Chen Xin Ma Han Lai Bin Yao State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China IEEE Ocean College Zhejiang UniversityZhoushan 316021 the State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027 Ocean research center of Zhoushan Zhejiang UniversityZhoushan 316021China School of engineering Technology Purdue UniversityWest LafayetteIN 47907 USA department of mechanical and Automation engineering The Chinese University of Hong KongHong Kong 999077China School of mechanical engineering Purdue UniversityWest LafayetteIN 47907 USA

Currently,most teleoperation work is focusing on scenarios where slave robots interact with unknown ***,in some fields such as medical robots or rescue robots,the other typical teleoperation application is precise object ***,the object’s weight is unknown yet essential for both accurate control of the slave robot and intuitive perception of the human ***,due to high cost and limited installation space,it is unreliable to employ a force sensor to directly measure the ***,in this paper,a control scheme free of force sensor is proposed for teleoperation robots to transfer a weight-unknown object *** this scheme,the workspace mapping between master and slave robot is firstly established,based on which,the operator can generate command trajectory on-line by operating the master ***,a slave controller is designed to follow the master command closely and estimate the object’s weight rapidly,accurately and robust to unmodeled ***,for the sake of telepresence,a master controller is designed to generate force feedback to reproduce the estimated weight of the *** the end,comparative experiments show that the proposed scheme can achieve better control accuracy and telepresence,with accurate force feedback generated in only 500 ms.

关键词： Adaptive robust control teleoperation telepresence transparency weight estimation

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Neural network reactive force field for C,H,N,and O systems

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npj Computational materials 2021年第1期7卷 69-78页

作者： Pilsun Yoo Michael Sakano Saaketh Desai Md Mahbubul Islam Peilin Liao Alejandro Strachan School of materials engineering and Birck Nanotechnology center Purdue UniversityWest LafayetteIN 47907USA department of mechanical engineering Wayne State UniversityDetroitMI 48202USA

Reactive force fields have enabled an atomic level description of a wide range of phenomena,from chemistry at extreme conditions to the operation of electrochemical devices and *** significant insight and semi-quantitative understanding have been drawn from such work,the accuracy of reactive force fields limits quantitative *** developed a neural network reactive force field(NNRF)for CHNO systems to describe the decomposition and reaction of the high-energy nitramine 1,3,5-trinitroperhydro-1,3,5-triazine(RDX).NNRF was trained using energies and forces of a total of 3100 molecules(11,941 geometries)and 15 condensed matter systems(32,973 geometries)obtained from density functional theory calculations with semi-empirical corrections to dispersion *** training set is generated via a semi-automated iterative procedure that enables refinement of the NNRF until a desired accuracy is *** root mean square(RMS)error of NNRF on a testing set of configurations describing the reaction of RDX is one order of magnitude lower than current state of the art potentials.

关键词： network field reactive

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Fragile X Messenger Ribonucleoprotein 1(FMR1), a novel inhibitor of osteoblast/osteocyte differentiation, regulates bone formation, mass, and strength in young and aged male and female mice

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Bone research 2023年第2期11卷 384-397页

作者： Padmini Deosthale Julián Balanta-Melo Amy Creecy Chongshan Liu Alejandro Marcial Laura Morales Julita Cridlin Sylvia Robertson Chiebuka Okpara David J.Sanchez Mahdi Ayoubi Joaquín N.Lugo Christopher J.Hernandez Joseph M.Wallace Lilian I.Plotkin department of Anatomy Cell Biology&PhysiologyIndiana University School of MedicineIndianapolisIN46202USA Roudebush Veterans Administration Medical center IndianapolisIN46202USA Indiana center for Musculoskeletal Health IndianapolisIN46202USA Universidad del Valle School of Dentistry Cali 760043Colombia department of Biomedical engineering Indiana University-Purdue University Indianapolis46202 IndianapolisIN46202USA Sibley School of mechanical and Aerospace engineering Cornell UniversityIthacaNY 14853USA department of materials Science and engineering Cornell UniversityIthacaNY14853USA department of Psychology and Neuroscience Baylor UniversityWacoTX76798USA

Fragile X Messenger Ribonucleoprotein 1(FMR1)gene mutations lead to fragile X syndrome,cognitive disorders,and,in some individuals,scoliosis and craniofacial ***-month-old(mo)male mice with deletion of the FMR1 gene exhibit a mild increase in cortical and cancellous femoral bone ***,consequences of absence of FMR1 in bone of young/aged male/female mice and the cellular basis of the skeletal phenotype remain *** found that absence of FMR1 results in improved bone properties with higher bone mineral density in both sexes and in 2-and 9-mo *** cancellous bone mass is higher only in females,whereas,cortical bone mass is higher in 2-and 9-mo males,but higher in 2-and lower in 9-mo female FMR1-knockout ***,male bones show higher biomechanical properties at 2mo,and females at both *** of FMR1 increases osteoblast/mineralization/bone formation and osteocyte dendricity/gene expression in vivo/ex vivo/in vitro,without affecting osteoclasts in vivo/ex ***,FMR1 is a novel osteoblast/osteocyte differentiation inhibitor,and its absence leads to age-,site-and sex-dependent higher bone mass/strength.

关键词： female Messenger agile

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Parallel Nanoimprint Forming of One-Dimensional Chiral Semiconductor for Strain-Engineered Optical Properties

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Nano-Micro Letters 2020年第11期12卷 242-254页

作者： Yixiu Wang Shengyu Jin Qingxiao Wang Min Wu Shukai Yao Peilin Liao Moon JKim Gary JCheng Wenzhuo Wu School of Industrial engineering Purdue UniversityWest LafayetteIN 47907USA Flex Laboratory Purdue UniversityWest LafayetteIN 47907USA department of materials Science and engineering University of Texas at DallasRichardsonTX 75080USA School of materials engineering Purdue UniversityWest LafayetteIN 47907USA Birck Nanotechnology center Purdue UniversityWest LafayetteIN 47907USA Regenstrief center for Healthcare engineering Purdue UniversityWest LafayetteIN 47907USA

The low-dimensional,highly anisotropic geometries,and superior mechanical properties of one-dimensional(1D) nanomaterials allow the exquisite strain engineering with a broad tunability inaccessible to bulk or thin-film *** capability enables unprecedented possibilities for probing intriguing physics and materials science in the 1-D *** the techniques for introducing controlled strains in 1D materials,nanoimprinting with embossed substrates attracts increased attention due to its capability to parallelly form nanomaterials into wrinkled structures with controlled periodicities,amplitudes,orientations at large scale with nanoscale ***,we systematically investigated the strain-engineered anisotropic optical properties in Te nanowires through introducing a controlled strain field using a resist-free thermally assisted nanoimprinting *** magnitude of induced strains can be tuned by adjusting the imprinting pressure,the nanowire diameter,and the patterns on the *** observed Raman spectra from the chiral-chain lattice of 1D Te reveal the strong lattice vibration response under the *** results suggest the potential of 1D Te as a promising candidate for flexible electronics,deformable optoelectronics,and wearable *** experimental platform can also enable the exquisite mechanical control in other nanomaterials using substrate-induced,on-demand,and controlled strains.

关键词： Chiral semiconductor Nanowires Nanoimprinting Strain engineering Optical property

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An interpretable deep learning approach for designing nanoporous silicon nitride membranes with tunable mechanical properties

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npj Computational materials 2023年第1期9卷 1524-1533页

作者： Ali KShargh Niaz Abdolrahim department of mechanical engineering University of RochesterRochesterNY 14627USA materials Science program University of RochesterRochesterNY 14627USA Laboratory for Laser energetics University of RochesterRochesterNY 14627USA

The high permeability and strong selectivity of nanoporous silicon nitride(NPN)membranes make them attractive in a broad range of *** their growing use,the strength of NPN membranes needs to be improved for further extending their biomedical *** this work,we implement a deep learning framework to design NPN membranes with improved or prescribed strength *** examine the predictions of our framework using physics-based *** results confirm that the proposed framework is not only able to predict the strength of NPN membranes with a wide range of microstructures,but also can design NPN membranes with prescribed or improved *** simulations further demonstrate that the microstructural heterogeneity that our framework suggests for the optimized design,lowers the stress concentration around the pores and leads to the strength improvement of NPN membranes as compared to conventional membranes with homogenous microstructures.

关键词： tunable prescribed strength

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Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se： An experimental and theoretical study

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Nano research 2016年第1期9卷 117-127页

作者： Haiyu Fang Je-Hyeong Bahk Tianli Feng Zhe Cheng Amr M. S. Mohammed Xinwei Wang Xiulin Ruan Ali Shakouri Yue Wu School of Chemical engineering Purdue University West Lafayette IN 47907 USA Birck Nanotechnology center Purdue University West Lafayette IN 47907 USA School of mechanical engineering Purdue University West Lafayette IN 47907 USA department of mechanical engineering Iowa State University Ames IA 50011 USA department of Chemical and Biological engineering Iowa State University Ames IA 50011 USA

We report the investigation of the thermoelectric properties of large-scale solution-synthesized Bi2Te3 nanocomposites prepared from nanowires hot- pressed into bulk pellets. A third element, Se, is introduced to tune the carrier concentration of the nanocomposites. Due to the Se doping, the thermoelectric figure of merit （ZT） of the nanocomposites is significantly enhanced due to the increased power factor and reduced thermal conductivity. We also find that thermal transport in our hot-pressed pellets is anisotropic, which results in different thermal conductivities along the in-plane and cross-plane directions. Theoretical calculations for both electronic and thermal transport are carried out to establish fundamental understanding of the material system and provide directions for further ZT optimization with adjustments to carrier concentration and mobility.

关键词： Bi2Te3 Se doping solution synthesis nanostructure thermoelectric

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