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Initial stage of degradation process of alumina-silica refractory by molten Al-5Mg alloy

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Keikinzoku/Journal of Japan Institute of Light Metals 2022年第11期72卷 631-637页

作者： Tamura, Yosuke Soda, Hiroshi McLean, Alexander Ishikawa, Takaaki Ishizuka, Michio Kawasaki, Masato Mizuno, Kentaro Motegi, Tetsuichi Department of Advanced Materials Science and Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Chiba Narashino-shi275-0016 Japan University of Toronto TorontoONM5S 3E4 Canada Chiba Industrial Technology Research Institute Chiba Chiba-shi Japan R&D Center Ceramics Div. Rozai Kogyo Kaisha Ltd. Hyogo Ako-shi Japan Development Center AGC Ceramics Co. Ltd. Hyogo Takasago-shi Japan Zmag Ltd. Chiba Shiroi-shi Japan Chiba Institute of Technology Chiba Funabashi-shi Japan

Initial stages of the refractory degradation process by molten Al-5Mg alloy were investigated by analyzing the degradation structures caused by an interaction with molten metal during heat cycles. The refractory aggregate, found to be poly-crystalline, consisting of cristobalite (SiO2) and mullite (Al6Si2O13), was deteriorated ahead of the surrounding matrix. Metal permeated into the refractory, forming a thin metal layer along the crucible surface below the molten metal line at an early stage of degradation process, which would later serve as the bases for the metal infiltration path through the refractory above the molten metal line. A discontinuous film (thickness2O4, was formed at the "melt / refractory" interface. At the experimental temperature of 1150°C, Mg in the molten metal would build up as Mg gas at MgAl2O4 film/refractory interface and easily diffuse into the aggregate body and react with the aggregate components of SiO2 and Al6Si2O13 to form MgAl2O4 and Al-Mg-Si-O compounds. This was followed by the molten metal infiltration into the refractory while reducing the Al-Mg-Si-O compound to form MgAl2O4. Through the initial degradation process MgAl2O4 would finally form in a successive chain of reactions, resulting in deterioration of the crucible. © 2022 The Japan Institute of Light Metals.

关键词： Corundum

Crystal and electronic structure engineering of tin monoxide by external pressure

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Journal of Advanced Ceramics 2021年第3期10卷 565-577页

作者： Kun LI Junjie WANG Vladislav ABLATOV Yutong GONG NaotoUMEZAWA Tomofumi TAdA Hideo HOSONO Artem rOGANOV State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China International Center for Materials Discovery School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Samara Center for Theoretical Materials Science(SCTMS) Samara State Technical UniversitySamara 443100Russia Samara Center for Theoretical Materials Science(SCTMS) Samara UniversitySamara 443011Russia Semiconductor R&D Center Samsung ElectronicsGyeonggi-do 18448Republic of Korea Materials Research Center for Element Strategy Tokyo Institute of TechnologyKanagawa 226-8503Japan Skolkovo Institute of Science and Technology Moscow 143026Russia Moscow Institute of Physics and Technology Dolgoprudny 141700Russia

Although tin monoxide (SnO) is an interesting compound due to its p-type conductivity,a widespread application of SnO has been limited by its narrow band gap of 0.7 *** this work,we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) *** calculations reveal that a metastable SnO (β-SnO),which possesses space group P2_(1)/c and a wide band gap of 1.9 eV,is more stable than α-SnO at pressures higher than 80 ***,a stable (space group P2/c) and a metastable (space group Pnma) phases of SnO appear at pressures higher than 120 *** and topological analyses show that P2/c-SnO has a high possibility to directly transform to β-SnO at around 120 *** work also reveals that β-SnO is a necessary intermediate state between high-pressure phase Pnma-SnO and low-pressure phase α-SnO for the phase transition path Pnma-SnO →β-SnO →α-*** phase transition analyses indicate that there is a high possibility to synthesize β-SnO under high-pressure conditions and have it remain stable under normal ***,our study reveals that the conductive property of β-SnO can be engineered in a low-pressure range (0-9 GPa)through a semiconductor-to-metal transition,while maintaining transparency in the visible light range.

关键词： tin monoxide van der Waals(vdW) topological relationship phase transition band gap

Enhancing the Performance of Surface-Textured Ge Schottky Photodetectors Using the Electroless Chemical Etching Method

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SSrN 2023年

作者： Zumuukhorol, Munkhsaikhan Boldbaatar, Sosorburam Khurelbaatar, Zagarzusem Paek, Ji-Yoon Shim, Kyu-Hwan Choi, Chel-Jong School of Semiconductor and Chemical Engineering Semiconductor Physics Research Center Jeonbuk National University Jeonju54896 Korea Republic of School of Information and Communication Technology Mongolian University of Science and Technology Ulaanbaatar51-29 Mongolia R&D Center Sigetronics Inc. Jeonju55314 Korea Republic of

We employed a technique to enhance the performance of Ge Schottky photodetectors (Pds), namely using an electroless chemical etching method to create an antireflective surface. This method was effective and is simple and inexpensive. The texturing process reduced the average reflection loss of Ge surfaces to approximately 10% in the 1010–1690 nm range of incident wavelengths. The optoelectrical characteristics of Ge Schottky Pds with different texturing times were compared with those of non-textured Ge Schottky Pds. As the texturing time increased, the reflectance gradually decreased, leading to improved device performance in terms of photoresponsivity, quantum efficiency, and specific detectivity across the entire measured wavelength range (1010–1690 nm). At biasing of -3 V and under illumination of 1550 nm incident light, the Ge Schottky Pd with surface texturing of over 50 min achieved responsivity and quantum efficiency of over 0.8 A/W and 65%, respectively. The device exhibited a linear relationship between the incident power and photocurrent with a slope value close to unity, indicating ideal device performance for surface-textured Ge Schottky Pds. This finding suggested that Ge Schottky Pds with surface texturing fabricated by using electroless chemical etching could be competitive candidates for near-infrared optoelectronics in the future. © 2023, The Authors. All rights reserved.

关键词： Quantum efficiency

Pivotal role of Boron-doped graphene quantum dots in stretchable and Self-Healable red emission nanocomposite Film: One step advance for white light emitting diodes application

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Chemical engineering Journal 2023年第1期473卷

作者： Hsu, Chen-Chu Laysandra, Livy Chiu, Yu-Cheng Liu, Wei-ren Department of Chemical Engineering R&D Center for Membrane Technology Center for Circular Economy Research Center for Semiconductor Materials and Advanced Optics Chung Yuan Christian University 200 Chung Pei Road Taiwan Chung Li District Taoyuan City32023 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology No. 43 Section 4 Taiwan Keelung Rd Da'an District Taipei City106335 Taiwan

In this study, red-emitting BGQds were prepared by a hydrothermal method derived from 1,3,6-Trinitropyrene (TNP) and boric acid. The luminescence properties of as-synthesized BGQds were characterized through photoluminescence (PL), time-resolved photoluminescence (TrPL), and UV–Vis measurements. After the modification of boron doping, B-GQds demonstrated superior optical properties and chemical stability compared to pristine ones. For the sake of continued stability in the luminescent layer performance derived from BGQds, poly{(n-butyl acrylate)–co-[N-(hydroxymethyl)acrylamide]} (PBA0.8-co-PNMA0.2) as an amphiphilic copolymer matrix with tunable mechanical, elastic, and self-healing properties was introduced. Through the synergistic effects between BGQds and amphiphilic copolymer side chain, the physical and mechanical properties of the red-emitting nanocomposite film were impressively improved. Furthermore, white light-emitting diodes (WLEds) were successfully fabricated by combining a 450 nm GaN chip, a commercial green-emitting (Ba,Sr)2SiO4:Eu2+ phosphor, and a self-healable red-emitting nanocomposite film, generating a high color rendering index (CrI) value of 89.4. © 2023

关键词： Nanocomposites

Phase stability and mechanical properties of wire+arc additively manufactured H13 tool steel at elevated temperatures

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Journal of Materials Science & technology 2021年第8期67卷 80-94页

作者： A.N.M.Tanvir Md.r.U.A hsan Gijeong Seo Brian Bates Chanho Lee Peter K.Liaw Mark Noakese Andrzej Nycz Changwook Ji duck Bong Kim Department of Mechanical Engineering Tennessee Technological UniversityCookevilleTN 38505USA Department of Manufacturing and Engineering Technology Tennessee Technological UniversityCookevilleTN 38505USA Center for Manufacturing Research Tennessee Technological UniversityCookevilleTN 38505USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN 37996USA Manufacturing Demonstration Facility Oak Ridge National LaboratoryOak RidgeTN 37830USA Advanced Forming Process R&D Group Korea Institute of Industrial TechnologyUlsan 44413Republic of Korea

Wire+arc additive manufacturing(WAAM)is considered an innovative technology that can change the manufacturing landscape in the near *** offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium-and large-sized parts such as die-casting *** this study,AISI H13 tool steel,a popular die-casting tool metal,is manufactured by cold metal transfer(CMT)-based WAAM and is then comprehensively analyzed for its microstructural and mechanical ***-dependent phase combinations are observed,which could be explained by nonequilibrium thermal cycles that resulted from the layer-by-layer stacking mechanism used in *** addition,remelting and reheating of the layers reduces welding anomalies(e.g.,pores and voids).The metallurgical characteristics of the H13 strongly correlate with the mechanical *** combinations of phases at different locations of the additively manufactured part exhibit a periodic microhardness ***,retained Austenite,Ferrite,and Carbide phases are found in combination at different locations of the part based on the part’s temperature distribution during additive ***,the tensile properties at elevated temperatures(23℃,300℃,and 600℃)are comparable to those from other WAAM and additive manufacturing(AM)*** X-ray diffraction results verify that the microstructural stability of the fabricated parts at high temperatures would allow them to be used in high temperatures.

关键词： Tool steel Martensitic steel Wire+arc additive manufacturing(WAAM) High temperature tensile test High temperature Xrd

Potential of Lactic Acid Bacteria to reduce the Immunogenicity of Gliadin

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SSrN 2025年

作者： Xu, Chao He, Ziqiong Ai, Zhilu Xie, Xinhua Yang, Yong Chen, Kai Wang, Jiajia Fan, Huiping Suo, Biao College of Food Science and Technology Henan Agricultural University Zhengzhou China Key Laboratory of Staple Grain Processing Ministry of Agriculture and Rural Affairs Zhengzhou China National R&D Center for Frozen Rice & Wheat Products Processing Technology Henan Engineering Laboratory of Quick-Frozen Flour-Rice Food and Prepared Food Henan Agricultural University Zhengzhou China Henan Engineering Research Center of Cold-Chain Food Zhengzhou China

Gliadin is recognized as the primary allergenic protein in wheat, and lactic acid bacteria (LAB) exhibit significant potential for mitigating its immunogenicity. In this study, four strains of LAB were isolated from Chinese traditional sourdough: Lactobacillus fermentum ACX0484, Lactobacillus brevis ACX0303, Lactobacillus curvatons ACX0476, and Lactobacillus plantarum ACX0410. The immunogenicity of gliadin in a gliadin-based medium (GBM) was evaluated using ELISA and SdS-PAGE. Subsequently, Fourier transforms infrared spectroscopy, Intrinsic fluorescence spectroscopy, and Ultraviolet absorption spectroscopy were employed to assess the impact of these LAB on the structural conformation of gliadin. results demonstrated that all four strains possessed considerable capacity to degrade gliadin after 24 h of treatment, with statistically significant differences observed among the strains (P © 2025, The Authors. All rights reserved.

关键词： Fluorescence spectroscopy

Enhancing Anaerobic digestion of Thermally Hydrolyzed Sludge by Sequencing Batch reactor With/Without Membrane Componentenhancing Anaerobic digestion of Thermally Hydrolyzed Sludge by Sequencing Batch reactor With/Without Membrane Component

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SSrN 2023年

作者： ren, Zhengran Gao, Jinhua Wang, Jiawei Wen, Yang Hao, Shan Zhang, Han Engineering Technology Research Center for Municipal Sewage Reclamation R&D Center Beijing Drainage Group Co. Ltd. Beijing100124 China Tonghui River Basin Company Beijing Drainage Group Co.Ltd. Beijing100082 China

This study compared the performance of anaerobic sequencing batch reactor (ASBr) and continuous stirred tank reactor (CSTr) for biogas production from thermally hydrolyzed sludge. The influent total solids (TS) concentration was varied from 2%, 4%, 6%, to 8% at a thermal hydrolysis temperature of 160°C. The results showed that ASBr outperformed CSTr with an increase in biogas yield by 19.80%, 10.78%, and 13.98% at influent TS concentrations of 2%, 4%, and 6%, respectively. However, at an influent TS concentration of 8%, no significant difference was observed between the two reactors due to poor sludge settling in ASBr. At a thermal hydrolysis temperature of 170°C and an influent TS concentration of 8%, the biogas production in ASBr was 18.04% higher than that in CSTr, and sludge settling occurred in ASBr. Even with an HrT shortened to 8 days, ASBr still operated stably with a biogas yield of 256 L/kgTS at an influent TS concentration of 6% and thermal hydrolysis temperature of 160°C, which was only 7.25% lower than that at an HrT of 15 days. The biogas production in the anaerobic membrane bioreactor (AnMBr) increased by 6% compared to that in ASBr © 2023, The Authors. All rights reserved.

关键词： Biogas

Etching dynamics of Geometrically Confined Silicon Nanostructure

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Microscopy and Microanalysis 2022年第S1期28卷 126-127页

作者： Koo, Kunmo Chang, Joon Ha Ji, Sanghyeon Choe, Jacob Shin, Seungmin Lee, Geun-Taek Kim, Tae-Hong Yuk, Jong Min Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon Republic of Korea Advanced Core Equipment Engineering & Development P/J Semiconductor R&D Center Samsung Electronics Hwaseong Republic of Korea

Erosion-Softened Commercial ro to Nf Membranes for Nib Electrolyte Napf6 Concentration

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SSrN 2023年

作者： Luo, Li-Han Li, Hua-Xiang Jia, rui Tong, Yi-Hao Han, rui Shen, Qian Xu, Sun-Jie Xu, Zhen-Liang State Key Laboratory of Chemical Engineering Membrane Science and Engineering R&D Lab Chemical Engineering Research Center School of Materials Science and Engineering School of Chemical Engineering School of Information Science and Engineering Shanghai Electronic Chemicals Innovation Institute East China University of Science and Technology 130 Meilong Road Shanghai200237 China

We propose a simple erosion softening with solvent activation and membrane structure reorganization method to activate commercial reverse osmosis (rO) membranes into nanofiltration (NF) membranes and explore their potential application in concentrating sodium-ion battery (NIB) electrolyte, sodium hexafluorophosphate (NaPF6). The method utilizes a N,N-dimethylformamide (dMF)/water mixture as the activating solvent to swell and disintegrate the loosely crosslinked polyamide (PA) layer on the surface of the rO membrane, enhancing the permeability of the PA layer while maintaining high rejection rates for divalent ions. Subsequently, during the further treatment of the membrane surface in membrane structure reorganization, tert-butanol (TBA) is introduced into the aqueous solution to reconstruct the surface PA layer, further improving the permeability. The optimal d8010T-T10 achieved a permeation flux of 24.2 L·m-2·h-1·bar-1, with rejection rates for sodium sulfate (Na2SO4), magnesium chloride (MgCl2), and magnesium sulfate (MgSO4) reaching 94.7%, 98.4%, and 99.1% respectively. And the mechanism of membrane structure reorganization with different solvent is analyzed and explained through dissipative particle dynamics (dPd) simulations. This study provides a commercially viable approach for manufacturing high-performance membranes. The d8010T-T10 membrane achieves more than 90% separation efficiency for NaPF6 dissolved in different solvents, providing a potential solution for the concentration of NaPF6 in industry. © 2023, The Authors. All rights reserved.

关键词： Magnesium compounds