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SSRN 2023年

作者： Ning, Minghui Wang, Yu Song, Shaowei Yang, Lun Ren, Zhifeng University of Houston HoustonTX77204 United States Materials Science and Engineering Program and TcSUH University of Houston HoustonTX77204 United States School of Materials Science and Engineering Hubei Normal University Hubei Huangshi435002 China

Stainless steel is widely utilized in industrial applications of alkaline water electrolysis due to its high anti-corrosion property, but it usually suffers from low catalytic activity. The complete activation of stainless steel to improve its efficiency while maintaining its excellent corrosion resistance is thus important for lowering the energy consumption of H2 production. Here, we developed an ultrafast one-step activation for stainless steel based on high-temperature heat treatment and quenching in an aqueous solution. After the activation, the resulting Ni-doped stainless-steel mat (Ni-SSM) exhibited significantly improved activity for both the hydrogen evolution reaction and the oxygen evolution reaction in comparison to pristine SSM. When assembled for overall water electrolysis, Ni-SSM delivered a current density of 100 mA/cm2 at a cell voltage of 1.72 V in 1 M KOH at 25 ℃, outperforming most of the stainless-steel-based electrodes reported thus far. Under a quasi-industrial environment of 6 M KOH at 60 ℃, Ni-SSM displayed extraordinary performance, producing a current density of 500 mA/cm2 at a low cell voltage of 1.615 V. Further durability testing showed that Ni-SSM maintains high performance at a current density of 500 mA/cm2 under this quasi-industrial environment for at least 150 h. Similar activation processes were applied to different substrates to verify the versatility of this strategy, and enhanced performance for alkaline water electrolysis was observed among all the selected substrates. Finally, 5×5 cm2 pieces of Ni-SSM were prepared and assembled in an anion exchange membrane (AEM) electrolyzer, in which they delivered a current of 12.5 A at a cell voltage of 1.93 V in 1 M KOH at 65 ℃. Therefore, the effectiveness of this activation strategy for improving activity and its feasibility and versatility together suggest its great potential for industrial application. © 2023, The Authors. All rights reserved.

关键词： Stainless steel

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Fabrication of Stable Liquid-like Wetting Buckled Surfaces as Bioinspired Antibiofouling Coatings by Using Silicon-Containing Block Copolymers

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ACS Applied materials and Interfaces 2024年第28期16卷 37212-37225页

作者： Chen, Ting-Lun Huang, Ching-Yu Lai, Yi-Shan Chen, Yi-Chen Yang, Yi-Ju Wang, Wei-Lung Hsueh, Han-Yu Department of Materials Science and Engineering National Chung Hsing University Taiwan Taichung40227 Taiwan Innovation and Development Center of Sustainable Agriculture National Chung Hsing University Taiwan Taichung40227 Taiwan Department of Natural Resources and Environmental Studies National Dong Hwa University Taiwan Hualien974301 Taiwan Department of Biology National Changhua University of Education Taiwan Changhua50007 Taiwan

Inspired by animals with a slippery epidermis, durable slippery antibiofouling coatings with liquid-like wetting buckled surfaces are successfully constructed in this study by combining dynamic-interfacial-release-induced buckling with self-assembled silicon-containing diblock copolymer (diBCP). The core diBCP material is polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS). Because silicon-containing polymers with intrinsic characters of low surface energy, they easily flow over and cover a surface after it has undergone controlled thermal treatment, generating a slippery wetting layer on which can eliminate polar interactions with biomolecules. Additionally, microbuckled patterns result in curved surfaces, which offer fewer points at which organisms can attach to the surface. Different from traditional slippery liquid-infused porous surfaces, the proposed liquid-like PDMS wetting layer, chemically bonded with PS, is stable and slippery but does not flow away. PS-b-PDMS diBCPs with various PDMS volume fractions are studied to compare the influence of PDMS segment length on antibiofouling performance. The surface characteristics of the diBCPs─ease of processing, transparency, and antibiofouling, anti-icing, and self-cleaning abilities─are examined under various conditions. Being able to fabricate ecofriendly silicon-based lubricant layers without needing to use fluorinated compounds and costly material precursors is an advantage in industrial practice. © 2024 The Authors. Published by American Chemical Society.

关键词： Block copolymers

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Construction of TiO_(2)-covalent organic framework Z-Scheme hybrid through coordination bond for photocatalytic CO_(2) conversion

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Journal of Energy Chemistry 2022年第1期31卷 85-92,I0003页

作者： Lei Wang Guofang Huang Liang Zhang Rui Lian Jingwei Huang Houde She Chunli Liu Qizhao Wang Key Laboratory of Eco-Environment-Related Polymer Materials Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070GansuChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina School of Environmental Science and Engineering Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of EducationChang'an University.Xi'an 710054ShaanxiChina Department of Physics Oxide Research Centerand Memory and Catalyst Research CenterHankuk University of Foreign StudiesYongin 17035Republic of Korea

In this work,a covalent organic framework(COF),which is constructed by the building blocks of[5,10,15,20-tetrakis(4-aminophenyl)porphinato]copper(Ⅱ)(CuTAPP)and p-benzaldehyde,is employed to integrate with TiO_(2) for the purpose of establishing a Z-scheme *** the system,isonicotinic acid performs the role of a bridge that connects the two components through a coordination *** photocatalytic application reveals the hybrid framework is able to catalyze CO_(2) conversion under simulated solar light,resulting in CO production rate of 50.5 μmol g^(-1)·h^(-1),about 9.9 and 24.5 times that of COF and pristine TiO_(2),*** ameliorated catalytic performance owes much to the por-phyrin block acting as photosensitizer that augments the light absorbance,and the establishment of Z-scheme system between the inorganic and orga nic comp on ents that enhances the separati on of the *** addition,the chemical bridge also ensures a steady usage and stable charge delivery in the *** study sheds light on the development of versatile approaches to covalently in corporate COFs with inorga nic semic on ductors.

关键词： CuP-Ph COF TiO_(2) Sensitization Z-scheme CO_(2)reduction Photocatalysis

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Nucleation effects of coccoliths in portland cement

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Matter 2025年

作者： Beatty, Danielle N. Srubar, Wil V. Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive UCB 027 BoulderCO80303 United States Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States

This work explores the use of photosynthesized coccoliths (intricate CaCO3 particles) as a nucleation agent or cement replacement in portland cement paste. First, coccoliths were produced and harvested from the marine microalgae Emiliania huxleyi and the particle size, morphology, and mineralogy were characterized. Then, the nucleation effects of E. huxleyi coccoliths as seeding agent (0.5, 1, 3, or 5 wt % additions) and limestone filler (5 and 15 wt % cement replacements) were studied using isothermal conduction calorimetry and compressive strength testing. The results were compared with five commercially available CaCO3 sources used as nucleation agents and fillers. While the high surface area of coccoliths (12.22 m2/g) enhanced water demand, it also enhanced nucleation during cement hydration without accelerating hydration, leading to enhanced early-age strength without detriments to 28-day strength. Results highlight a potential carbon reduction strategy, namely employing photosynthesis as a method of mineral admixture production, for the cement and concrete industry. © 2025 Elsevier Inc.

关键词： Portland cement

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Multi-Component Lubricant Additives Derived from Pickering Emulsion-Templated Ionic Liquid Microcapsules

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Journal of Molecular Liquids 2025年 422卷

作者： Yan, Jieming Lak, Sarah N. Pentzer, Emily B. Mangolini, Filippo Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program The University of Texas at Austin AustinTX78712 United States Department of Chemistry Texas A&M University College StationTX77843 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Room-temperature ionic liquids (RTILs) have emerged as potential next-generation lubricants owing to their unique physico-chemical properties and promising lubricating behavior. However, their implementation in tribological applications has partly been hindered by their negligible solubility in hydrocarbon fluids. Here, encapsulated ionic liquids (ENILs) with a core of 1-hexyl-3-imidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][TFSI]) and a composite shell of polyurea/graphene oxide were prepared via Pickering emulsion-templated interfacial polymerization using two approaches, namely an RTIL-in-water emulsion stabilized with graphene oxide (GO) nanosheets ([HMIM][TFSI]/GO) and an RTIL-in-oil emulsion-stabilized with octadecylamine-functionalized GO nanosheets ([HMIM][TFSI]/C18-GO). The synthesized ENILs were successfully dispersed in polyalphaolefin (PAO) synthetic oil and used as additives to lubricate 52100 steel-vs.-52100 steel sliding contacts. Tribological tests provided evidence that the addition of [HMIM][TFSI]/C18-GO and [HMIM][TFSI]/GO ENILs to PAO could reduce friction and wear owing to the release of the encapsulated [HMIM][TFSI] at the sliding interface after the mechanical breakage of the shell material at the contact inlet, but only if a significant fraction of the ENILs has a diameter smaller than 20 µm. Comparison of these results with the outcomes of sliding experiments performed with PAO containing ENIL obtained by mini-emulsion polymerization with poly(ethylene glycol dimethacrylate-co-buytl methacrylate) (poly(EGDM-c-BMA)) shells highlights the role of the shell material in reducing friction. These outcomes not only demonstrate that multiple parameters (i.e., size distribution, shell material) affect the tribological performance of ENILs, but also pave the way towards further systematic investigations for optimizing ENILs to be used as additives in oil formulations. © 2025 Elsevier B.V.

关键词： Emulsification

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Photoresponse of Thermally Evaporated Copper Oxide-Based Solar Cells 1

Photoresponse of Thermally Evaporated Copper Oxide-Based Sol...

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1st Middle East and North Africa Solar Conference, MENA-SC 2023

作者： Alami, Abdul Hai Ayoub, Mohamad Alashkar, Adnan Alasad, Shamma Mdallal, Ayman Khuri, Siren Aljaghoub, Haya University of Sharjah Sustainable Energy & Power Systems Research Centre Sustainable and Renewable Energy Engineering Department Sharjah United Arab Emirates American University of Sharjah Materials Science and Engineering PhD Program Sharjah United Arab Emirates American University of Sharjah Mechancial Engineering Department Sharjah United Arab Emirates University of Sharjah Sustainable Energy & Power Systems Research Centre Sharjah United Arab Emirates University of Sharjah Industrial Engineering and Engineering Management Department Sharjah United Arab Emirates

ISBN: (纸本)9781665491464

This study reports on the fabrication and characterization of a copper oxide (CuO)-based photoactive cell. Copper was thermally evaporated onto two substrates and post-treated using chemical and thermal treatments to obtain different semiconducting types of CuO. Absorption measurements were conducted to obtain the bandgaps of CuO, which were found to be 1.51 eV and 1.21 eV, for the chemically and thermally treated CuO, respectively. Finally, a chronoamperometry test was conducted to confirm the photoresponse of the cell, which showed a doubling of output current values under light conditions compared to dark conditions. © 2023 IEEE.

关键词： Copper oxides

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Evaluation of Solubilization Time in Uncontrolled Atmosphere on Grain Growth, Phase Transformation Temperatures, and Mechanical Properties in a CuAlBe SMA

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Metallurgical and materials Transactions A: Physical Metallurgy and materials science 2025年

作者： da Silva Franco, Luiz Henrique Caluête, Rafael Evaristo de Lima, Bruno Alessandro Silva Guedes de Oliveira, Danniel Ferreira Brito, Ieverton Caiandre Andrade Department of Materials Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil Department of Mechanical Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil Graduate Program in Materials Science and Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil

Thermomechanical properties of SMAs are strongly affected by the metallurgical conditions imposed during their production. In this work, experiments were performed to investigate the behavior of the Cu–11.8Al–0.50Be (wt pct) SMA during solubilization at different times under an uncontrolled atmosphere. The results presented serve as a basis for predicting the macrostructure and thermomechanical properties in practical applications using CuAlBe SMAs. The grain growth evaluated by OM proved to be extremely sensitive to treatment time even after short intervals, tending to stabilize after 12 hours. Chemical analysis by EDS indicated a small variation in Al content produced during solidification, with 3 hours being enough to homogenize the Al concentration throughout the ingot despite producing a microstructure with non-uniform grain size. This variation in Al is not significant enough to influence the phase transformation temperatures, with the changes attributed to the grain growth and loss of Be by oxidation. ¼ hour resulted in the lowest values for maximum stress/strain, while 24 hours of solubilization showed the highest values of strain with small dispersion. The mixed fracture type (brittle/ductile) observed by SEM in the ¼ hour samples supports the hypothesis that ¼ hour is insufficient to dissolve the phases formed during solidification. This effect is aggravated by the strong elastic anisotropy, which contributes to embrittlement during quenching. © The Minerals, Metals & materials Society and ASM International 2025.

关键词： Setting

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Improved mechanical, degradation, and biological performances of Zn–Fe alloys as bioresorbable implants

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Bioactive materials 2022年第11期7卷 334-343页

作者： Yingchao Su Jiayin Fu Wonsae Lee Shaokang Du Yi-Xian Qin Yufeng Zheng Yadong Wang Donghui Zhu Department of Biomedical Engineering Stony Brook UniversityStony BrookNYUSA Nancy E.and Peter C.Meinig School of Biomedical Engineering Cornell UniversityIthacaNYUSA Department of Cardiology Sir Run Run Shaw HospitalZhejiang UniversityHangzhouZhejiangChina Academy for Advanced Interdisciplinary Studies Peking UniversityBeijingChina School of Materials Science and Engineering Peking UniversityBeijingChina

Zinc(Zn)is a promising bioresorbable implant material with more moderate degradation rate compared to magnesium(Mg)and iron(Fe).However,the low mechanical strength and localized degradation behavior of pure Zn limit its clinical *** is one of the most effective ways to overcome these *** screening the alloying element candidates regarding their potentials for improvement on the degradation and biocompatibility,we proposed Fe as the alloying element for Zn,and investigated the in vitro and in vivo performances of these alloys in both subcutaneous and femoral *** showed that the uniformly distributed secondary phase in Zn–Fe alloys significantly improved the mechanical property and facilitated uniform degradation,which thus enhanced their biocompatibility,especially the Zn-0.4Fe ***,these Zn–Fe alloys showed outstanding antibacterial *** together,Zn–Fe alloys could be promising can-didates as bioresorbable medical implants for various cardiovascular,wound closure,and orthopedic applications.

关键词： Zinc Mechanical Degradation Biocompatibility Antibacterial

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Co nanoparticles confined in mesopores of MFI zeolite for selective syngas conversion to heavy liquid hydrocarbon fuels

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Chinese Journal of Catalysis 2025年第1期68卷 246-258页

作者： Neng Gong Quanzheng Deng Yujiao Wang Zitao Wang Lu Han Peng Wu Shun'ai Che School of Chemical Science and Engineering Tongji UniversityShanghai 200092China Multi-scale Porous Materials Center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of Inorganic Synthesis&Preparative Chemistry Jilin UniversityChangchun 130015JilinChina Shanghai Key Laboratory of Green Chemistry and Chemical Processes State Key Laboratory of Petroleum Molecular&Process EngineeringSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China

Designing Fischer-Tropsch synthesis(FTS)catalysts to selectively produce liquid hydrocarbon fuels is a crucial ***,we selectively introduced Co nanoparticles(NPs)into the micropores and mesopores of an ordered mesoporous MFI zeolite(OMMZ)through impregnation,which controlled the carbon number distribution in the FTS products by tuning the position of catalytic active sites in differently sized *** Co precursors coordinated by acetate with a size of 9.4×4.2×2.5Åand by 2,2'-bipyridine with a size of 9.5×8.7×7.9Å,smaller and larger than the micropores(ca.5.5Å)of MFI,made the Co species incorporated in OMMZ's micropores and mesopores,*** carbon number products synthesized with the Co NPs confined in mesopores were larger than that in *** high jet and diesel selectivities of 66.5%and 65.3%were achieved with Co NPs confined in micropores and mesopores of less acidic Na-type OMMZ,*** and jet selectivities of 76.7%and 70.8%were achieved with Co NPs confined in micropores and mesopores of H-type OMMZ with Brönsted acid sites,respectively.A series of characterizations revealed that the selective production of diesel and jet fuels was due to the C-C cleavage suppressing of heavier hydrocarbons by the Co NPs located in mesopores.

关键词： Fischer-Tropsch synthesis Heavy liquid hydrocarbon fuel Co nanoparticle Ordered mesoporous MFI zeolite C-C cleavage

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Computational Reverse engineering Analysis of Scattering Experiments Method for Interpretation of 2D Small-Angle Scattering Profiles (CREASE-2D)

arXiv

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arXiv 2024年

作者： Akepati, Sri Vishnuvardhan Reddy Gupta, Nitant Jayaraman, Arthi Data Science Program University of Delaware NewarkDE19716 United States Department of Chemical and Biomolecular Engineering University of Delaware NewarkDE19716 United States Department of Materials Science and Engineering University of Delaware NewarkDE19716 United States

Characterization of structural diversity within soft materials is key for engineering new materials for various applications. Small-angle scattering (SAS) is a widely used characterization technique that provides structural information in soft materials at varying length scales (nm to microns). The typical output of a SAS measurement is the scattered intensity I(q) as a function of q, the scattered wavevector with respect to the incident wave. The scattered wavevector q is represented by its magnitude |q| ≡ q (in inverse distance units) and azimuthal angle θ. While structures with isotropic spatial arrangement can be interpreted by analysis of azimuthally averaged one-dimensional (1D) scattering profile, to understand anisotropic spatial arrangements, one has to interpret the two-dimensional (2D) scattering profile, I(q, θ). Manual interpretation of such 2D profiles is complicated, and usually involves fitting of approximate analytical models to azimuthally averaged sections of the 2D profile. In this paper, we present a new method called CREASE-2D that interprets, without any azimuthal averaging, the entire 2D scattering profile, I(q, θ), and outputs the relevant structural features. CREASE-2D is an extension of the ‘computational reverse engineering analysis for scatting experiments’ (CREASE) method that has been used successfully to analyze 1D SAS profiles for a variety of soft materials. CREASE uses a genetic algorithm for optimization and an artificial neural network (ANN) as the surrogate machine learning (ML) model for fast calculation of 1D ‘computed’ scattering profiles that are then compared to the experimental 1D scattering profiles in the optimization. CREASE-2D goes beyond CREASE by enabling analysis of 2D scattering profiles, which is far more challenging to interpret than the azimuthally averaged 1D profiles. Further, we use XGBoost as the surrogate ML model in CREASE-2D, in place of ANNs, to relate structural features to the I(q, θ) profile. The CREA

关键词： Inverse problems

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