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Chemical Compounds from GC/MS Analysis, Functional Investigations, and Corrosion Inhibition Efficacy of a Bio-based and Sustainable Extract against HCl Solution-Activated Corrosion

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Journal of Bio- and Tribo-Corrosion 2025年第2期11卷 1-20页

作者： Ofuyekpone, Okiemute Dickson Okuma, Silas Oseme Iweriolor, Sunday Utu, Ochuko Goodluck Department of Materials and Metallurgical Engineering Faculty of Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Mechanical Engineering Faculty of Engineering Nigeria Maritime University Okerenkoko Nigeria Department of Mechanical Engineering Faculty of Engineering University of Delta Agbor Nigeria Department of Welding and Fabrication Engineering Delta State Polytechnic Ogwashi-Uku Nigeria

Chemicalcompounds from Gas Chromatography/Mass Spectroscopy and functional experimentations of pulverized egg shell extract (PESE) with acetone as solvent showed the presence of polar and non-polar compounds. Among the found organic compounds, some were found to be green and raw materials for medical companies and the polymer industry. Corrosion inhibition investigation was carried out using gravimetric, thermometric, and potentiodynamic polarization approaches, and morphological characterization. Results obtained demonstrated that the extract significantly reduced the half-life of steel, indicating that the oxidation of mild steel in HCl solutions was mitigated due to the adsorption of active chemical components from the extract onto the adsorbent surface. This suggests that the active ingredients in the extract were instrumental in safeguarding and prolonging the lifespan of the steel samples against corrosion-triggering chloride anion. Findings from gravimetric, thermometric, and potentiodynamic polarization approaches are in alignment and indicate that the extract's effectiveness is dependent on concentration and time. The extract efficiency was noticed to increase with concentration until the solution reached saturation point, and decreased with prolonged immersion time. The observed FTIR peaks and morphological display also corroborate the reported inhibitory prowess of the extract. Potentiodynamic polarization parameters revealed that the extract acted with a mixed mechanism. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Gas chromatography

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Targeted regeneration and upcycling of spent graphite by defect‐driven tin nucleation

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Carbon Energy 2024年第4期6卷 91-103页

作者： Zhiheng Cheng Zhiling Luo Hao Zhang Wuxing Zhang Wang Gao Yang Zhang Long Qie Yonggang Yao Yunhui Huang Kun Kelvin Fu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchunChina Electronic Materials Research Laboratory(Key Lab of Education Ministry) School of Electronic and Information Engineeringand Instrumental Analysis CenterXi'an Jiaotong UniversityXi'anChina Department of Mechanical Engineering University of DelawareNewarkUSA

The recycling of spent batteries has become increasingly important owing to their wide applications,abundant raw material supply,and sustainable *** with the degraded cathode,spent anode graphite often has a relatively intact structure with few defects after long ***,most spent graphite is simply burned or discarded due to its limited value and inferior performance on using conventional recycling methods that are complex,have low efficiency,and fail in performance ***,we propose a fast,efficient,and“intelligent”strategy to regenerate and upcycle spent graphite based on defect‐driven targeted *** Sn as a nanoscale healant,we used rapid heating(~50 ms)to enable dynamic Sn droplets to automatically nucleate around the surface defects on the graphite upon cooling owing to strong binding to the defects(~5.84 eV/atom),thus simultaneously achieving Sn dispersion and graphite *** a result,the regenerated graphite showed enhanced capacity and cycle stability(458.9 mAh g^(−1) at 0.2 A g^(−1) after 100 cycles),superior to those of commercial *** from the self‐adaption of Sn dispersion,spent graphite with different degrees of defects can be regenerated to similar structures and *** analysis indicates that targeted regeneration and upcycling have significantly lower energy consumption(~99%reduction)and near‐zero CO_(2) emission,and yield much higher profit than hydrometallurgy,which opens a new avenue for direct upcycling of spend graphite in an efficient,green,and profitable manner for sustainable battery manufacture.

关键词： battery recycling spent graphite targeted regeneration upcycling graphite

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Hybrid electrodes effective for both electrowetting-and dielectrowetting-driven digital microfluidics

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Droplet 2023年第3期2卷 60-67页

作者： Hongyao Geng Sung Kwon Cho Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPennsylvaniaUSA

Electrowetting on dielectric(EWOD)and dielectrowetting(DEW)are two major principles to drive droplets in digital *** is effective to manipulate(create,transport,split,and merge)conductive droplets being currently used for many biological,chemical,and optical *** can also manipulate droplets but more efficiently with dielectric(nonconductive)fluids.A digital microfluidic platform efficiently operable by both EWOD and DEW would offer higher versatility in handling a wide range of fluids,regardless of their *** this regard,this article presents a new hybrid electrode design enabling EWOD and DEW to drive various kinds of droplet fluids on a single *** addition,a slippery liquid-infused surface(SLIPS)is integrated with the hybrid *** SLIPS is well known to resist biofouling and repel sticky fluids,which endows the hybrid electrodes with much wider application *** a result,the present SLIPS-integrated hybrid electrodes facilitate actuating various kinds of fluids which would not be driven by conventional EWOD and/or DEW *** paper presents the successful transportation of not only conductive fluids including water,protein solution,glycerol,and honey but also nonconductive fluids including dodecane,silicone oil,and light and heavy crude oil,all driven by the SLIPS-integrated hybrid *** performance comparisons among solid,interdigitating,and hybrid electrodes are made by testing both conductive and nonconductive droplets.

关键词： dielectric fluid fouling

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Integrated modeling to control vaporization-induced composition change during additive manufacturing of nickelbased superalloys

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npj Computational materials 2024年第1期10卷 788-798页

作者： Tuhin Mukherjee Junji Shinjo Tarasankar DebRoy Chinnapat Panwisawas Department of Mechanical Engineering Iowa State UniversityAmesIAUSA Next Generation Tatara Co-Creation Centre Shimane UniversityMatsueJapan Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPAUSA School of Engineering and Materials Science Queen Mary University of LondonLondonUK

Acritical issue in laserpowder bed fusion(LPBF)additivemanufacturing is the selective vaporization of alloying elements resulting in poor mechanical properties and corrosion resistance of *** process also alters the part’s chemical composition compared to the *** we present a novel multi-physics modeling framework,integrating heat and fluid flow simulations,thermodynamic calculations,and evaporation modeling to estimate and control the composition change during LPBF of nickel-based *** validation confirms the accuracy of our ***,we quantify the relative vulnerabilities of different nickel-based superalloys to composition change quantitatively and we examine the effect of remelting due to the layer-by-layer deposition during the LPBF *** variations in evaporative flux and compositions for each element were determined,providing valuable insights into the LPBF process and product *** results of this study can be used to optimize theLPBF process parameters such as laserpower,scanning speed,and powder layer thickness to ensure the production of high-quality components with desired chemical compositions.

关键词： corrosion alloying additive

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Revealing the oxidation growth mechanism and crack evolution law of novel Si-HfO_(2)/Yb_(2)Si_(2)O_(7)/Yb_(2)SiO_(5)environmental barrier coatings during thermal cycling

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Journal of Advanced Ceramics 2024年第10期13卷 1677-1696页

作者： Ruixiang Liu Wenping Liang Qiang Miao Hui Zhao Xiaofeng Zhang Meng Zhang Rongxue Yan Brindha Ramasubramanian Seeram Ramakrishna College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510651China

The development of Si-HfO_(2)/Yb_(2)Si_(2)O_(7)/Yb_(2)SiO_(5)environmental barrier coatings(EBCs)aims to improve the operational temperature and longevity of ceramic matrix composites(CMCs)in turbine ***,several critical questions remain unanswered,including the oxidation mechanism of Si-HfO_(2)bond coating,the compatibility of its mixed thermally grown oxide(m-TGO)with adjacent layers during thermal cycling,and the evolution pattern of vertical mud-cracks that impact the overall performance in *** plasma spraying physical vapor deposition(PS-PVD),we fabricated these EBCs on a CMC substrate,and thermal cycling tests at 1400,1450,and 1500℃ revealed that their durability reached 200 h.m-TGO growth followed a parabolic model,with the oxygen diffusion activation energy being 133.69 kJ/mol between 1400 and 1450℃ and 101.47 kJ/mol from 1450 to 1500℃,emphasizing that the transport of molecular oxygen is key to controlling the oxidation of m-TGO in this EBC *** residual stresses and stored elastic strain energy build up between m-TGO and adjacent layers,especially around the cristobalite phase transition temperature,causing interlaminar crack formation in later thermal cycles,the stored elastic strain energy remains lower than that of the silicon oxide-thermally grown oxide(SiO_(2)-TGO)formed in Si bond coating *** addition to[110]dislocations,(001)twinning and interaction zones between twinning and dislocations were discovered for the first time,driving the bifurcation of mud ***,controlling the mud-crack density is vital for protection of Yb_(2)SiO_(5)layer,as bifurcated mud-crack tips may converge with adjacent mud-cracks.

关键词： environmental barrier coatings(EBCs) thermal cycling oxidation crack propagation defects

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Thermal and mechanical enhancements in polyimide/basalt fiber composites through mineral-based nano-dust particles

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Iranian Polymer Journal (English Edition) 2025年 1-12页

作者： Kumar, Arputham Arul Jeya Kumar, Ramasamy Senthil Madan, Madhur Gangishetti, Ankit Prakash, Muniyandi Department of Mechanical Engineering Center for Composites and Advanced Materials SRM Institute of Science and Technology Kattankulathur Tamil Nadu Chennai603203 India Department of Mechanical Engineering Mohamed Sathak Engineering College Tamil Nadu Keelakarai623806 India

The mineral-based nanoparticles derived from grinding of automobile brake pads are used in this study. The influence of nano-brake-pad dust particles in polyimide (PI) reinforced basalt fiber (BF) composites is experimentally investigated. Four different weight fractions of composites are prepared using hot compression molding. The fabricated PBN composites with dispersed nano-dust fillers find applications in automobile and aerospace engineering. The physical properties of the formulated composites are studied using Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) are carried out to identify the enhanced thermal behavior of the composites. The FTIR spectrum indicates the stretching of molecular structure for the occurrence of C=O links. SEM shows the strong interfacial bonding between the ingredients and matrix. DSC shows the glass transition temperature reduces with nanoparticles addition. TGA reveals that the composites withstand a temperature of 512.15 °C without degrading and the percentage of weight loss after degradation of the composite enhances to 28.64% more, when compared to the pure sample. DMA shows a significant increase of about 84.32% in storage modulus and subsequent decrease in the value of tan δ by around 42.9% when the weight percentage of nano-dust particles increases, compared with pure composites. The presence of multiple elements in the nano-dust particles may influence the physical and thermo-mechanical properties of the polymer composite when compared with single compound nanocomposites. © Iran Polymer and Petrochemical Institute 2025.

关键词： Compression molding

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Manipulating polarization attenuation in NbS_(2)-NiS_(2)nanoflowers through homogeneous heterophase interface engineering toward microwave absorption with shifted frequency bands

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Nano materials science 2024年第6期6卷 794-804页

作者： Yiru Fu Yuping Wang Junye Cheng Yao Li Jing Wang Yongheng Jin Deqing Zhang Guangping Zheng Maosheng Cao School of Materials Science and Engineering Qiqihar UniversityQiqihar161006China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhenGuangdong Province517182China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonChina School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

Homogeneous heterogeneous(heterophase)interfaces regulated with low energy barriers have a fast response to applied electric fields and could provide a unique interfacial polarization,which facilitate the transport of electrons across the *** regulation on the interfaces is effective in modulating electromagnetic wave absorbing ***,we construct NbS_(2)–NiS_(2)heterostructures with NiS_(2)nanoparticles uniformly grown in NbS_(2)hollow nanospheres,and such particular structure enhances the interfacial *** strong electron transfer at the interface promotes electron transport throughout the material,which results in less scattering,promotes conduct ion loss and dielectric polarization relaxation,improves dielectric loss,and results in a good impedance matching of the ***,the absorbing band may be successful *** regulating the amount of NiS_(2),the heterogeneous interface is finely alternated so that the overall wave-absorbing performance is shifted to lower *** a NiS_(2)content of 15 wt%and an absorber thickness of 1.84 mm,the minimum reflection loss at 14.56 GHz is53.1 dB,and the effective absorption bandwidth is 5.04 GHz;more importantly,the minimum reflection loss in different bands is20 dB,and the microwave energy absorption rate reaches 99%when the thickness is about 1.5–4.5 *** work demonstrates the construction of homogeneous heterostructures is effective in improving the electromagnetic absorption properties,providing guideline for the synthesis of highly efficient electromagnetic absorbing materials.

关键词： Interface engineering Electromagnetic wave absorption Heterostructures Interfacial polarization

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Enhancing the thermal conductivity of semiconductor thin films via phonon funneling

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npj Computational materials 2024年第1期10卷 1414-1422页

作者： C.Jaymes Dionne Sandip Thakur Nick Scholz Patrick Hopkins Ashutosh Giri Department of Mechanical Industrialand Systems EngineeringUniversity of Rhode IslandKingston02881 RIUSA Department of Mechanical and Aerospace Engineering University of VirginiaCharlottesville22904 VAUSA Department of Materials Science and Engineering University of VirginiaCharlottesville22904 VAUSA Department of Physics University of VirginiaCharlottesville22904 VAUSA

The second law of thermodynamics asserts that energy diffuses from hot to *** resulting temperature gradients drive the efficiencies and failures in a plethora of ***,as the dimensionalities of materials shrink to the nanoscale regime,proper heat dissipation strategies becomemore challenging since the mean free paths of phonons become larger than the characteristic length *** leads to temperature gradients that are dependent on interfaces and boundaries,which ultimately can lead to severe thermal ***,we uncover a phenomenon which we refer to as‘phonon funneling’,that allows the control of phonon transport to preferentially direct phonon energy away from geometrically confined interfacial thermal bottlenecks and into localized colder *** phenomenon supersedes heat diffusion based on the macroscale temperature gradients,thus introducing a nanoscale regime in which boundary scattering increases the phonon thermal conductivity of thin films,an opposite effect than what is traditionally *** work advances the fundamental understanding of phonon transport at the nanoscale and the role of efficient scattering methods for enhancing thermal transport.

关键词： thermal conductivity films

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Effects of Interface Anisotropy on the Solidification Morphology of Zinc Alloys and Development of Data Assimilation for Their Estimation

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第6期111卷 326-335页

作者： Yamamura, Ayano Yasuda, Hideyuki Takaki, Tomohiro Graduate School of Science and Technology Kyoto Institute of Technology Japan Department of Materials Science and Engineering Kyoto University Japan Faculty of Mechanical Engineering Kyoto Institute of Technology Japan

The solid–liquid interface energy anisotropy of Zn alloys remains poorly understood. Recently, characteristic 14-arm dendritic growth has been observed using time-resolved X-ray computed tomography at SPring-8 during the solidification of a Zn–4mass%Al alloy. This study investigates the dependence of the dendrite morphologies of Zn alloys on solid–liquid interface energy anisotropy through systematic phase-field simulations of the growth of an isolated equiaxed dendrite. We also develop a data assimilation system to estimate the anisotropy parameters of solid–liquid interface energy and crystal orientation in Zn alloys and validate the system through twin experiments. This study provides insights into the solidification of Zn alloys and a powerful tool for their investigation. © 2025 The Iron and Steel Institute of Japan.

关键词： data assimilation dendrite phase-field method solidification solid–liquid interface energy zinc alloy

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Prediction and optimisation of gasoline quality in petroleum refining: The use of machine learning model as a surrogate in optimisation framework

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CAAI Transactions on Intelligence Technology 2024年第5期9卷 1185-1198页

作者： Husnain Saghir Iftikhar Ahmad Manabu Kano Hakan Caliskan Hiki Hong School of Chemical and Materials Engineering National University of Sciences and TechnologyIslamabadPakistan Department of Systems Science Kyoto UniversityKyotoJapan Department of Mechanical Engineering Faculty of Engineering and Natural SciencesUsak UniversityUsakTurkey Department of Mechanical Engineering Kyung Hee UniversityYonginRepublic of Korea

Hardware-based sensing frameworks such as cooperative fuel research engines are conventionally used to monitor research octane number (RON) in the petroleum refining industry. Machine learning techniques are employed to predict the RON of integrated naphtha reforming and isomerisation processes. A dynamic Aspen HYSYS model was used to generate data by introducing artificial uncertainties in the range of ±5% in process conditions, such as temperature, flow rates, etc. The generated data was used to train support vector machines (SVM), Gaussian process regression (GPR), artificial neural networks (ANN), regression trees (RT), and ensemble trees (ET). Hyperparameter tuning was performed to enhance the prediction capabilities of GPR, ANN, SVM, ET and RT models. Performance analysis of the models indicates that GPR, ANN, and SVM with R2 values of 0.99, 0.978, and 0.979 and RMSE values of 0.108, 0.262, and 0.258, respectively performed better than the remaining models and had the prediction capability to capture the RON dependence on predictor variables. ET and RT had an R2 value of 0.94 and 0.89, respectively. The GPR model was used as a surrogate model for fitness function evaluations in two optimisation frameworks based on genetic algorithm and particle swarm method. Optimal parameter values found by the optimisation methodology increased the RON value by 3.52%. The proposed methodology of surrogate-based optimisation will provide a platform for plant-level implementation to realise the concept of industry 4.0 in the refinery.

关键词： genetic algorithms mach in ne learning multi-objective optimisation

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