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129th ASEE Annual Conference and Exposition: Excellence Through Diversity, ASEE 2022

作者： Ezeonu, Lotanna Baxter, Gail Li, Wei Lee, Woo Department of Chemical Engineering and Materials Science Stevens Institute of Technology United States Center for Innovation in Engineering and Science Stevens Institute of Technology United States Division of Information Technology Stevens Institute of Technology United States Department of Chemistry and Chemical Biology Stevens Institute of Technology United States

This work gives details and results of an evidence-based practice adopted for teaching a large introductory engineering course titled: "Introduction to materials science and engineering" (a 3-credit hour course) required for all engineering students in their third year. Historically, this core engineering course has been taught in a traditional teacher-centered way. Over the past several years, we significantly revised course content, design and delivery so students could experience a knowledge-building culture. The goal was to facilitate their development as deep and life-long learners. After coverage of basic materials concepts in the first half of the semester, students are challenged to create and evaluate an authentic idea that would help reduce microplastic pollution in the oceans. A series of learning activities was developed and used to guide students to identify a plastic product of their interest and assess quantitively and critically how the product could be redesigned and/or made with alternative materials. These learning activities include: (1) workshops to guide students through divergent and convergent thinking and equip them with necessary knowledge needed to embark on the project, (2) report development with feedback from undergraduate teaching assistants, and (3) self-reflection to prompt students to think about what and how they learned, and their perceptions of the impact of the knowledge building approach on their learning. Due to large enrollments (over 250 students per semester), Canvas-based digital tools were extensively used to administer these learning activities along with significant contributions from undergraduate teaching assistants. Despite the limitations associated with large enrollments, our experience suggests that the knowledge creation approach can be effective in engaging engineering students in problem-solving, knowledge synthesis, written discourse and reflection that enables deep learning. © American Society for engineering

关键词： Students

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From High-Entropy Alloys to Alloys with High Entropy: A New Paradigm in materials science and engineering for Advancing Sustainable Metallurgy

arXiv

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arXiv 2025年

作者： Torralba, Jose Manuel Meza, Alberto Sivagnana, Venkatesh Mostafaei, Amir Mohammadzadeh, Ahad Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de Madrid Av. Universidad 30 Leganés28911 Spain Imdea Materials Institute Calle Eric Kandel 2 Getafe Madrid28906 Spain Department of Mechanical Materials and Aerospace Engineering Illinois Institute of Technology 10 W 32nd Street ChicagoIL60616 United States Department of Materials Engineering Faculty of Engineering University of Maragheh P.O. Box 83111 Maragheh55181 Iran

The development of high-entropy alloys (HEAs) has marked a paradigm shift in alloy design, moving away from traditional methods that prioritize a dominant base metal enhanced by minor elements. HEAs instead incorporate multiple alloying elements with no single dominant component, broadening the scope of alloy design. This shift has led to the creation of diverse alloys with high entropy (AHEs) families, including high-entropy steels, superalloys, and intermetallics, each highlighting the need to consider additional factors such as stacking fault energy (SFE), lattice misfit, and anti-phase boundary energy (APBE) due to their significant influence on microstructure and performance. Leveraging multiple elements in alloying opens up promising possibilities for developing new alloys from multi-component scrap and electronic waste, reducing reliance on critical metals and emphasizing the need for advanced data generation techniques. With the vast possibilities offered by these multi-component feedstocks, modelling and Artificial Intelligence based tools are essential to efficiently explore and optimize new alloys, supporting sustainable progress in metallurgy. These advancements call for a reimagined alloy design framework, emphasizing robust data acquisition, alternative design parameters, and advanced computational tools over traditional composition-focused methodologies. © 2025, CC BY.

关键词： Intermetallics

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Constructing High-content,Highly Ordered Shish-Kebab Crystals during Hot-stretching via Varying Contents of Reserved Shish in Ultra-long Chain Ultra-high Molecular Weight Polyethylene Gel Systems

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Chinese Journal of Polymer science 2025年第5期43卷 778-792页

作者： Chao-Wei Xing Qiu-Yue Cui Jia-Wei Gao Ye-Shun Zhong Jia-Jun Tang Zi-Hao Gao Yi-Guo Li Zong-Bao Wang School of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China

Ultra-high molecular weight polyethylene(UHMWPE)is widely utilized in low-dimensional materials due to its ultra-long chain imparted excellent strength and *** employing gel-molding technology with a gradient temperature control,this study successfully produced gel films with varying shish crystal contents of the UHMWPE with a molecular weight of 8.0 *** structural evolution during film hotstretching was investigated by in-situ wide-angle X-ray diffraction(WAXD),small-angle X-ray scattering(SAXS),ultra-small-angle X-ray scattering(USAXS),and ex-situ methods of scanning electron microscopy(SEM)and differential scanning calorimetry(DSC).The ultra-long molecular chains delay stress transfer during stretching but provide more nucleation sites for shish-kebab crystallization to form well-ordered shish-kebab crystals under high *** reserved high-content shish facilitates structural evolution,inducing the formation of highly-ordered shish-kebab crystals that eventually transfer into shish crystals in the later stage of *** samples with low shish content,although the structural evolution is facilitated during stretching,predominantly result in newly formed shish-kebab crystals through melt ***,some unoriented lamellae persists in unreserved samples stretching progress,leading to less ordered shish-kebab *** comparing with previous work of UHMWPE with low molecular weights,we demonstrate that the ultra-long molecular chains also play a key role on enabling the construction of highly-ordered shish-kebab crystals with high shish content during hot-stretching of UHMWPE gel films,providing new insights into processing control and optimization for engineering applications.

关键词： UHMWPE gel film Shish-kebab Ultra-long chain structure Hot-stretching

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2D CaWO4 nanosheets derived from scheelite minerals for enhanced electrocatalysis in oxygen evolution reaction

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science China Chemistry 2025年第5期68卷 2170-2177页

作者： Qing Sun Yongxiang Sun Yan Dong Hong Zhong Hongbo Zeng National & Local United Engineering Laboratory for New Petrochemical Materials & Fine Utilization of Resources College of Chemistry and Chemical EngineeringHunan Normal University Department of Chemical and Materials Engineering University of Alberta College of Chemistry and Materials Engineering Hunan University of Arts and Science College of Chemistry and Chemical Engineering Central South University

Scheelite（CaWO4） mineral holds promise as a cost-effective and efficient catalyst for the oxygen evolution reaction（OER） crucial in renewable energy ***,challenges such as limited active site exposure and low electrocatalytic performance need *** this work,we have fabricated two-dimensional（2D） CaWO4nanosheets from scheelite minerals via a straightforward ultrasonic exfoliation method and evaluated their efficacy as OER *** to scheelite powders,these 2D nanosheets exhibited superior crystallinity and a 1.26-fold increase in electrochemical surface area,promoting active site *** 2D CaWO4nanosheet electrode demonstrated outstanding OER catalytic performance,achieving a current density of 20 mA/cm2at an overpotential of 290 mV in alkaline conditions,which was lower than that of bulk CaWO4electrodes（～340 mV）.Density functional theory calculations attributed this enhanced catalytic performance to moderate adsorption of oxygenated intermediates（*OH,*O,and*OOH） on the W sites of 2D *** situ electrochemical atomic force microscopy tests also confirmed the catalytic enhancement by 2D CaWO4nanosheets during *** findings demonstrate the potential of affordable and abundant mineral resources in advancing electrochemical catalysts for oxygen evolution,highlighting their broader application in sustainable energy technologies.

关键词： scheelite mineral two-dimensional nanosheets electrocatalysis oxygen evolution reaction

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Structural Evolution of Ultra-High Molecular Weight Polyethylene Low-Entangled Films with Reserved Shish Crystals During Hot Stretching

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Chinese Journal of Polymer science 2024年第8期42卷 1227-1242页

作者： Jia-Wei Gao Li Chen Ye-Shun Zhong Chao-Wei Xing Yi-Guo Li Zong-Bao Wang School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China

Shish crystals are crucial to achieving high performance low-dimensional ultra-high molecular weight polyethylene(UHMWPE)***,high stretch and shear flow fields are necessary for the formation of shish *** this study,UHMWPE gel films with reserved shish crystals were prepared by gel molding,the structural evolution and properties of UHMWPE films stretched at temperatu res of 100,110,120and 130℃were investigated by in situ small-angle X-ray scattering(SAXS)/ultra-small-angle X-ray scattering(USAXS)/wide-angle X-ray diffraction(WAXD)measu rements as well as scanning electron microscopy(SEM)and differential scanning calorimetry(DSC)*** findings showed that the reserved shish crystals can facilitate the formation and structural evolution of shish-kebab crystals during the hot ***,the reserved shish crystals promote the structu ral evolution of UHMWPE films to a greater extent when stretched at 120 and 130℃,compared to 100 and 110℃,resulting in higher crystallinity,orientation,thermal properties,breaking strength and Young's *** pared to UHMWPE high-entangled films with reserved shish crystals prepared by compression molding,UHMWPE low-entangled films with reserved shish crystals prepared by gel molding are more effective in inducing the formation and evolution of shish-kebab crystals during the hot stretching,resulting in increased breaking strength and Young's modulus.

关键词： UHMWPE low-entangled films Reserved shish crystals Structural evolution Hot stretching

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Cu-substituted nickel hexacyanoferrate with tunable reaction potentials for superior ammonium ion storage

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Journal of materials science & Technology 2024年第2期169卷 19-27页

作者： Leiyu Fan Guangchang Shu Yiwen Liu Haoxiang Yu Lei Yan Liyuan Zhang Jie Shu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China

In this work,a variety of Cu_(x)Ni_(2-x)Fe(CN)_(6)(x=0,0.4,0.8,1.2,1.6,2)cathodes for ammonium ion batteries are prepared and their electrochemical performances are *** the introduction of copper in nickel hexacyanoferrate,the electrochemical performance varies without changing the structure of nickel *** increase of Cu content in nickel hexacyanoferrate leads to the enhancement of reaction potential and *** results suggest that the substitution of Cu for Ni has a positive effect on improving the cycling stability and rate capacity of nickel hexacyanoferrate when x in Cu_(x)Ni_(2-x)Fe(CN)_(6)is less than ***,Cu_(0.4)Ni_(1.6)Fe(CN)_(6)exhibits the best cycling per-formance(capacity retention of 97.54%at 0.3 C)and the highest rate capacity(41.4 mAh g^(-1)at 10 C)in Cu_(x)Ni_(2-x)Fe(CN)_(6).Additionally,the X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)tests also reveal that the structural evolution of Cu_(0.4)Ni_(1.6)Fe(CN)_(6)is highly reversible upon NH_(4)^(+)***,this work proposes a candidate material for ammoniumion batteries and offers a novel avenue for adjusting the operating potential of the material.

关键词： Nickel hexacyanoferrate Copper hexacyanoferrate NH_(4)^(+)storage Ammonium ion batteries Aqueous batteries

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Construction of S-scheme cyano-modified g-C3N4/TiO2 film with boosted charge transfer and highly hydrophilic surface for enhanced photocatalytic degradation of norfloxacin

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材料科学技术（英文版） 2025年第3期206卷 74-87页

作者： Wei Gan Ruixin Chen Li Zhang Jun Guo Miao Zhang Yuqing Lu Zhaoqi Sun Xucheng Fu College of Materials and Chemical Engineering West Anhui UniversityLu'an 237015China School of Materials Science and Engineering Anhui UniversityHefei 230601China School of Materials Science and Engineering Anhui UniversityHefei 230601China College of Materials and Chemical Engineering West Anhui UniversityLu'an 237015China School of Electronic Engineering Huainan Normal University Huainan 232038China

Developing highly efficient and recyclable photocatalysts has been regarded as an attractive strategy to solve antibiotic ***,we designed and fabricated Cy-C3N4/TiO2 S-scheme heterojunction film with boosted charge transfer and a highly hydrophilic *** as-prepared heterojunction ex-hibited outstanding removal efficiency on tetracyclines and fluoroquinolone antibiotics(more than 80％within 90 min).The removal rate of 300-Cy-C3N4/TiO2 on norfloxacin(NOR)was 2.12,and 1.59 times higher than that of pristine TiO2,C3N4/TiO2,*** excellent photocatalytic performance of 300-Cy-C3N4/TiO2 was attributed to the highly hydrophilic surface and effective transfer and separation of ***,the NOR degradation pathways were proposed based on the results of density func-tional theory(DFT),and liquid chromatography-mass *** toxicity assessment indicated the toxicity of intermediates can be remarkably *** DFT calculation and selective photo-deposition experiment demonstrated that an internal electric field was formed at the heterojunction interface,and the charge carriers migrated between Cy-C3N4 and TiO2 following an S-scheme transfer *** research not only provides a promising method for tracking charge distribution on thin-film heterojunc-tion photocatalysts but also helps us to design high-efficiency,and recyclable heterojunctions to solve antibiotic contaminants.

关键词： Cyano group Carbon nitride Norfloxacin DFT calculation S-scheme heterojunction

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Interface structure of α-Mg/14H-LPSO:First-principles prediction and experimental study

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Journal of Rare Earths 2024年第9期42卷 1792-1799,I0006页

作者： Yuan Shi Xiaohua Zhang Hongyan Yue Chao Li School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin150040China

The interfacial structure of the α-Mg/14H-LPSO phase in rare earth-including magnesium alloy was investigated via high-angle annular dark-field scanning transmission electron microscopy(HAADFSTEM) imaging and first-principles calculations of density-functional *** possible interfacial models were constructed according to the different terminations of the LPSO phase,and the corresponding interfacial energies were calculated,from which the four most stable structures(Terl-MgY-hollow,Ter2-Zn-hollow,Ter3-MgYII-hollow and Ter4-Mg-bridge) were *** interfacial phase diagrams related to the Y chemical potentials were obtained from the calculations,and the most stable interfacial structure was ***-MgY-hollow and Ter2-Zn-hollow have the lowest interfacial energies in the range of-0.7 eV <Δμγ<-0.6 eV,where fluctuating change of state is the minimized and the interface is the most *** separation work of the two models was calculated to predict the bonding strength of the structures at both ends of the *** calculation results show that the maximum interfacial separation work is 1.45 J/m^(2) for the interface model of α-Mg and 14H-LPSO phase structure with Ter2-Zn-hollow termination.

关键词： Rare earths Magnesium alloy HAADF-STEM LPSO First-principles Interface

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Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

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Chinese Journal of Polymer science 2025年第2期43卷 316-327页

作者： Wen Yang Liang Yuan Kai Gong Ruo-Han Zhang Lan Lei Hui Li School of Chemistry and Chemical Engineering Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering MaterialsUniversity of JinanJinan250022China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China

It is urgent to develop high-performance polyimide(PI)films that simultaneously exhibit high transparency,exceptional thermal stability,mechanical robustness,and low dielectric to fulfil the requirements of flexible display ***,a series of fluorinated polyimide films(FPIs)were fabricated by the condensation of 5,5′-(perfluoropropane-2,2-diyl)bis(isobenzofuran-1,3-dione)(6FDA)and the fluorinated triphenylmethane diamine monomer(EDA,MEDA and DMEDA)with heat-crosslinkable tetrafluorostyrene side groups,which was incorporated by different numbers of methyl groups pendant in the ortho position of amino ***,the FPI films underwent heating to produce crosslinking FPIs(C-FPIs)through the self-crosslinking of double bonds in the *** transparency,solvent resistance,thermal stability,mechanical robustness and dielectric properties of FPI and C-FPI films can be tuned by the number of methyl groups and crosslinking,which were deeply investigated by virtue of molecular dynamics(MD)simulations and density functional theory(DFT).As a result,all the films exhibited exceptional optically colorless and transparent,with transmittance in the visible region of 450-700 nm exceeding 79.9%,and the cut-off wavelengths(λ_(off))were nearly 350 *** thermal decomposition temperatures at 5% weight loss(T_(d5%))for all samples exceeded 504℃.These films exhibited a wide range of tunable tensile strength(46.5-75.1 MPa).Significantly,they showed exceptional dielectric properties with the dielectric constant of 2.3-2.5 at full frequency(10^(7)-20 Hz).This study not only highlights the relationship between the polymer molecular structure and properties,but offer insights for balancing optical transparency,heat resistance and low dielectric constant in PI films.

关键词： Crosslinkable fluorinated polyimide Methyl group Triphenylmethane Transparency Thermal stability Low dielectric constant

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Study on the adsorption performance and regeneration of lignin-derived graphitic carbon for H_(2)S

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Particuology 2024年第11期94卷 197-210页

作者： Fen Li Ruiying Wang Ying Yang Menglong Zheng Qiushuang Li Dongdong Yang Huiyu Chen Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province School of Materials Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin150080China

In pursuit of effective adsorption materials for malodorous gases such as H_(2)S and to broaden the utilization avenues of lignin waste,this study employed the direct pyrolysis method to synthesize three types of alkali lignin graphitized carbons,namely C-800,KC-700,and *** them,KEC-700 exhibits a high specific surface area of 1672.9 m^(2)/g,significantly superior H_(2)S adsorption performance compared to other materials,an adsorption breakthrough time of up to 220 min,and a sulfur capacity of 67.1 mg/*** analysis showed that the more oxygen-containing functional groups of lignin charcoal and the larger specific surface area facilitated the adsorption of H_(2)*** reaching adsorption saturation,the degree of graphitization of lignin carbon *** H_(2)S adsorption products primarily manifest as elemental sulfur and sulfate within the pores of lignin carbon measuring less than 2 *** thermal regeneration,the charcoal effectively eliminates the elemental sulfur adsorption ***,sulfate removal proved unsatisfactory,as the adsorption efficiency of KEC-700 following two thermal regenerations was approximately 41%of that observed for fresh samples.

关键词： Hydrogen sulfide Alkali lignin Lignin carbon Regeneration

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