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NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

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Journal of materials Science & technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

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An Evaluation on Physical Characteristics of Konjac Polysaccharides-Based Film Coating and Its Application for Strawberries Preservation

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Journal of Renewable materials 2025年第1期13卷 181-197页

作者： Desy Nurliasari Awaly Ilham Dewantoro Muhammad Adly Rahandi Lubis Roni Kastaman Mohamad Djali Efri Mardawati Devi Maulida Rahmah Siti Nurhasanah Akbar Hanif Dawam Abdullah Lukmanul Hakim Zaini Department of Agricultural Industrial Technology Faculty of Agro-Industrial TechnologyUniversitas PadjadjaranJatinangor45363Indonesia Research Center for Biomass and Bioproducts National and Innovation AgencyCibinong1691Indonesia Research Collaboration Center for Biomass and Biorefinery between BRIN and Universitas Padjadjaran Jatinangor45363Indonesia Research Center for Appropriate Technology Universitas PadjadjaranJatinangor45363Indonesia Department of Food Industrial Technology Faculty of Agro-Industrial TechnologyUniversitas PadjadjaranJatinangor45363Indonesia Department of Forest Products Faculty of Forestry and EnvironmentIPB UniversityBogor16680Indonesia Institute of Wood Technology and Renewable Materials Department of Material Sciences and Process EngineeringUniversity of Natural Resources and Life SciencesVienna(BOKU)Vienna1180Austria

Konjac is an ideal candidate for edible coatings on fruits due to its hydrophilic properties,ﬁlm-forming ability,barrier properties,safety,and ***,the high market demand for strawberries necessitates post-harvest treatment to extend their shelf life and preserve their quality,as strawberries are known for their fragile skin and soft *** fully utilize konjac and develop high-quality coatingﬁlms,native konjacﬂour(NKF)and konjac glucomannan(KGM)were extracted from its corm and used as a coatingﬁlm for strawberries in the present ***,this study aimed to compare the physical properties of theﬁlm coatings between NKF and KGM,and evaluate their effects on strawberries preservation over 7 days of storage.A multistage extrac-tion process was employed to isolate NKF and KGM,after which the glucomannan content was *** yield was 31.81%,exceeding KGM yield of 26.42%,and the glucomannan content obtained of NKF(25.93%)was higher than KGM(21.41%).Nuclear magnetic resonance spectroscopy conﬁrmed that both NKF and KGM con-tain glucomannan in their ***,both NKF and KGM were combined with carboxymethyl cel-lulose(CMC)and glycerol to produce eight thin-layerﬁlms to assess their physical and mechanical *** to the KGM variant,the NKF variant generally exhibited higher moisture content,water vapor trans-mission rate,and tensile ***,NKF was less effective than KGM in extending strawberry storage life,leading to faster color changes and greater weight loss,despite maintaining similar hardness ***,konjac-based coatings were generally effective at maintaining the freshness and quality of strawberries compared to uncoated *** shows promise as an edible coating,improving fresh produce shelf life and appeal,aligning with consumer preferences for natural and sustainable products.

关键词： Amorphophalus oncophyllus coating performances edibleﬁlm strawberry preservation

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Effect of Malic Acid as a Compatibilizer in Chemically Modified Cassava Starch/Polyvinyl Alcohol Blends for Potential Packaging Applications 13th

Effect of Malic Acid as a Compatibilizer in Chemically Modif...

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ICSBE 2022 - Proceedings of the 13th International Conference on Sustainable Built Environment

作者： Gunawardene, O.H.P. Amaraweera, S.M. Wannikayaka, W.M.D.B. Fernando, N.M.L. Gunathilake, C.A. Manamperi, W.A. Kulatunga, A.K. Manipura, A. Department of Chemical and Process Engineering University of Peradeniya Peradeniya Sri Lanka Department of Manufacturing and Industrial Engineering University of Peradeniya Peradeniya Sri Lanka Department of Material and Nano Science Technology Wayamba University of Sri Lanka Kuliyapitiya Sri Lanka Materials Engineering Department California Polytechnic State University San Luis ObispoCA United States

ISBN: (纸本)9789819934706

There has been a growing interest in developing biodegradable materials due to the continuous accumulation of non-degradable plastic wastes across the globe. Therefore, this work focuses on producing and evaluating ‘green’ multifunctional film materials based on a mixed eco-friendly thermoplastic starch (TPS)/polyvinyl alcohol (PVA) matrix compatibilized with malic acid. In this study, the blend films of TPS/PVA were prepared by adopting the solution casting method. Herein, a starch modification was performed under acidic conditions using tetraethyl orthosilicate (TEOS) as the chemical modifying agent. The prepared blends were characterized using Fourier transforms infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Moreover, the water absorption and tensile tests were also carried out according to ASTM standards. The biodegradability test was carried out according to the aerobic compost environment test. The results of FTIR analysis confirmed the successful preparation of modified cassava starch which exhibited enhanced thermal stability and crystallinity. Further, the compatibilized blends exhibited enhanced thermal, mechanical, and water-resistant properties with improved blend homogeneity. This suggested the possibility of occurring crosslinking reactions among starch, PVA, glycerol, and malic acid upon compatibilization while possessing a dense molecular structure. The biodegradation was slowed upon both starch modification and compatibilization whereas the least water absorption capacity was demonstrated by the TPS/PVA (40/60 w/w) blend compatibilized with 5 wt.% malic acid (M4P6-M5) valuing 28.89% and 42.17% at 2 and 24 h, respectively. Besides, improved mechanical properties could be obtained by the same blend film valuing 36.25 MPa and 162.91% for tensile strength and elongation at break, respectively. Therefore, enhanced mechanical and ther

关键词： Scanning electron microscopy

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Effects of Refined Coconut Oil and Vegetable Oil on the Mechanical, Thermal, Morphological, and Biodegradable Properties of Cassava Starch-Based Thermoplastic (TPS) Films 13th

Effects of Refined Coconut Oil and Vegetable Oil on the Mech...

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ICSBE 2022 - Proceedings of the 13th International Conference on Sustainable Built Environment

作者： Fernando, N.M.L. Amaraweera, S.M. Gunawardene, O.H.P. Wanninayaka, W.M.D.B. Gunathilake, C.A. Manamperi, W.A. Kulatunga, A.K. Manipura, A. Department of Manufacturing and Industrial Engineering University of Peradeniya Peradeniya Sri Lanka Department of Chemical and Process Engineering University of Peradeniya Peradeniya Sri Lanka Department of Material and Nano Science Technology Wayamba University of Sri Lanka Kuliyapitiya Sri Lanka Materials Engineering Department California Polytechnic State University San Luis ObispoCA United States

ISBN: (纸本)9789819934706

The effect of addition of different concentrations of refined coconut oil (CO) and vegetable oil (palm olein oil) (VO) on the mechanical and thermal properties, as well as water absorption, biodegradability and morphology of cassava starch-based TPS films were investigated. Cassava starch-based TPS films were prepared by the solvent casting method using glycerol as the plasticizer incorporation with varying concentrations of CO and VO at 5,10,20, and 40 wt % based on cassava starch. The X-ray diffractometry (XRD), fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analysis were carried out to observe the interactions between the starch matrix and oil, thermal stability, decomposition temperature and morphology of films. An increase in tensile strength was observed with the increment of both CO and VO concentration while the maximum tensile strength was observed at the oil concentration of 10 wt % for both CO and VO. However, films containing VO have higher tensile strength (4.18 MPa) than the films containing CO (3.56 MPa). Tensile strain at break decreased when increasing the oil concentration up to 10 wt % for both CO and VO. Water absorption of the films increased when increasing the oil concentration. However, the value was less than the reference sample until the oil concentration was 20 wt % for both CO and VO. Moreover, all the samples are biodegradable. Cassava starch, refined coconut oil, and vegetable oil are natural resources that can be used to produce alternative materials that cause minor environmental impact. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Tensile strength

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Analysis of mechanical properties of 3D printed metallic specimens of aluminum (CL31) bronze (CL80) material manufactured at varying laser scanning speed

Analysis of mechanical properties of 3D printed metallic spe...

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2022 International Conference on material Science, Mechanics and technology, ICMMT 2022

作者： Vashist, V. Oldal, I. Szakal, Z. Doctoral School of Mechanical Engineering Hungarian University of Agriculture and Life Sciences Gödöllo Hungary Material Sciences and Industrial Process Department Institute of Technology Hungarian University of Agriculture and Life Sciences Gödöllo Hungary

In our research work, we analyzed the mechanical properties of 3D-printed metallic specimens of aluminium bronze material. In our evaluation, we had five groups of specimens, manufactured at different laser scanning speeds. In total, we had 25 specimens for which we examined various parameters like ultimate tensile strength, engineering yield point, relative strain, and hardness. Results showed that specimens prepared with a lower laser scanning speed of 300mm/s showed the lowest tensile strength. The tensile strength increased with increasing laser scan speed and the highest tensile strength was attained by specimens of the fourth group that were produced at a laser scanning speed of 500mm/s. The relative strain of specimens also increased with the increasing scan speed of the laser. The Brinell hardness test also showed an elevation in hardness values with increasing laser scan speeds. © Published under licence by IOP Publishing Ltd.

关键词： Bronze

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Stability and thermal conductivity of different nano-composite material prepared for thermal energy storage applications

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South African Journal of Chemical engineering 2022年 39卷 72-89页

作者： Ibrahim, Sarmad I. Ali, Ahmed H. Hafidh, Sanaa A. Chaichan, Miqdam T. Kazem, Hussein A Ali, Jarinah Mohd Isahak, Wan Nor Roslam Alamiery, Ahmed Material Eng. Department University of Technology - Iraq Energy and Renewable Energies Technology Center University of Technology – Iraq Faculty of Engineering Sohar University Sohar Oman Department of Chemical and Process Engineering Faculty of Engineering and Built Environment University Kebangsaan Malaysia (UKM) P.O. Box: 43000 Bangi Selangor Malaysia

The interest in solar energy applications doubles due to the necessities of the stage, and because of it, the interest in heat storage materials expands, the most important of which is paraffins. Paraffins suffer from low thermal conductivity, so many researchers have added nanomaterials that improve this property. In this study, nano-TiO2 and MgO and a 50% mixture of each were added to the Iraqi paraffin. The addition of nanoparticles caused the paraffin to change color from brown to white with the change of absorbance and transmittance properties. The density, viscosity, and heat capacity of the products increased slightly. The thermal conductivity of the products improved and the highest value obtained was 24.92%. The melting and solidification points decreased by one degree Celsius for the case of addition of nano-TiO2 and MgO and by 2 °C for the case of addition of the hybrid nanoparticles. Besides, the period of phase change of the products decreased. The nano-paraffin mixture showed high stability for more than 90 days and it is preferable to repeat the mixing process every 6 months to ensure this property. The study concludes that the addition of hybrid nano-TiO2 and MgO to Iraqi paraffin is suitable for solar energy applications. © 2021 The Author(s)

关键词： Hybrid nanoparticles Melting-solidification cycles MgO Paraffin Thermal conductivity TiO2

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Evolution of Steel Chemistry and Cleanliness During RH Degassing process

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Iron and Steel technology 2023年第6期20卷 170-179页

作者： Garg, Diti Sahoo, P.P. Tripathy, P.K. Ghosh, Biswajit Shah, Hitesh Hasmukhrai Viswanathan, N.N. Kumar, Deepoo Tech. Steel and Casting Technology Tata Steel Ltd. JH Jamshedpur India R&D Tata Steel Ltd. JH Jamshedpur India Raw Material Technology Group Process Technology Tata Steel Ltd. JH Jamshedpur India Technology Tata Steel Ltd. JH Jamshedpur India LD2 and Slab Caster Tata Steel Ltd. JH Jamshedpur India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology – Bombay MH Mumbai India

Ultralow-carbon steels produced by the converter are further decarburized, deoxidized and alloyed in a RH degasser. Timing and the amount of alloying additions/blowing can significantly affect the process efficiency and steel quality. Kinetic models can be used to study decarburization, mixing of alloys, chemistry and cleanliness evolution during the process. In this work, steel and slag samples are collected during the RH degassing process. A kinetic model for the RH degassing process is developed using the macroprocessing feature in FactSage 8.1. The measured chemistry of steel and slag and inclusion analysis of the steel samples is used to estimate the model parameters. © Association for Iron & Steel technology.

关键词： Slags

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Giant tunneling magnetoresistance in insulated altermagnet/ferromagnet junctions induced by spin-dependent tunneling effect

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Physical Review B 2024年第13期110卷 134437页

作者： Fangqi Liu Zhenhua Zhang Xiaojuan Yuan Yong Liu Sicong Zhu Zhihong Lu Rui Xiong Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education School of Physics and Technology The State Key Laboratory of Refractories and Metallurgy School of Material Science and Technology Hubei Province Key Laboratory of Systems Science in Metallurgical Process Department of Mechanical Engineering

The nondegenerate energy bands along a specific path of altermagnet enable the realization of magnetic tunnel junctions (MTJs) with high tunnel magnetoresistance (TMR). Herein, we propose a MTJ based on insulated altermagnet/ferromagnetic MTJ−MnF2/CrO2. In addition to effectively simplifying the device configuration, high TMR is attained in the [110] and [111] crystal directions due to the spin-dependent tunneling effect in the real space of MnF2. The increase in the thickness of the MnF2 layer leads to an increase in electron spin filtering efficiency (SFE). When the thickness of the MnF2 layer is three layers, the SFE is as high as 85.65% and the TMR is as high as 104%. In addition, we find that the interface type has a significant impact on the magnetoresistance performance of the tunnel junction. Compared with F interface, the O interface leads to a further increase in the SFE of MnF2 (99.56%) and conductance of MTJ, and thus a significant enhancement of the TMR (up to 105%). The analysis of electronic states in real space reveals that the coordination of oxygen atoms with magnetic atoms in the current direction gives rise to the endowed electronic states and an increase in spin polarizability in the vicinity. The results provide insight into the development of ultrafast and efficient spintronic devices with altermagnet.

关键词： Antiferroelectricity Electrical properties First-principles calculations Magnetism Spintronics

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Highly Scalable Vertical Bypass RRAM (VB-RRAM) for 3D V -NAND Memory

Highly Scalable Vertical Bypass RRAM (VB-RRAM) for 3D V -NAN...

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Symposium on VLSI technology

作者： Geonhui Han Youngdong Kim Jaeseon Kim Dongmin Kim Yoori Seo Chuljun Lee Jinmyung Choi Jinwoo Lee Dongho Ahn Sechung Oh Donghwa Lee Hyunsang Hwang Department of Material Science and Engineering Pohang University of Science and Technology (POSTECH) Pohang Korea Advanced Process Development Team 2 Samsung Electronics Gyeonggi-do Republic of Korea

ISBN: (数字)9798350361469

ISBN: (纸本)9798350361476

We firstly demonstrate highly scalable interface type RRAM based 3D V-NAND memory with WOx resistivity switching (RS) layer and IGZO selector transistor (Tr). 3D vertical interface type RRAM integrated with IGZO Tr (VB-RRAM), utilizing bypass reading between Tr and RS layer, exhibits low voltage operation (< 5 V), multi-bit (4 bit) capability, and high uniformity of the RS layer while improving the limitations of on/off ratio. Furthermore, with scaling the channel length down to 30 nm, we achieved fast switching speed (~50 us), stable endurance (> 10 7 cycles), and low switching energy consumption (5 fJ). Finally, critical V-NAND issues like read disturbance and interface layer were also evaluated.

关键词： Low voltage Energy consumption Three-dimensional displays Switches Very large scale integration Conductivity Transistors

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engineering single atomic ruthenium on defective nickel vanadium layered double hydroxide for highly efficient hydrogen evolution

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Nano Research 2023年第4期16卷 4612-4619页

作者： Xiaoyu Chen Jiawei Wan Meng Zheng Jin Wang Qinghua Zhang Lin Gu Lirong Zheng Xianzhu Fu Ranbo Yu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing InstitutionBeijing 100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Fabricating single-atom catalysts(SACs)with high catalytic activity as well as great stability is a big ***,we propose a precise synthesis strategy to stabilize single atomic ruthenium through regulating vanadium defects of nickel vanadium layered double hydroxides(NiV-LDH)ultrathin nanoribbons ***,the isolated atomically Ru doped NiV-LDH ultrathin nanoribbons(NiVRu-R)were successfully fabricated with a super-high Ru load of 12.8 wt.%.X-ray absorption spectrum(XAS)characterization further confirmed atomic dispersion of *** catalysts for electrocatalytic hydrogen evolution reaction(HER)in alkaline media,the NiVRu-R demonstrated superior catalytic properties to the commercial Pt/***,it maintained exceptional stability even after 5,000 cyclic voltammetry ***-situ XAS and density functional theory(DFT)calculations prove that the Ru atomic sites are stabilized on supports through forming the Ru-O-V structure,which also help promote the catalytic properties through reducing the energy barrier on atomic Ru catalytic sites.

关键词： hydrogen evolution reaction layered double hydroxide ruthenium atomic site ultrathin nanoribbons

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