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Innovative Nanocomposites for Low Power Phase-change Memory: GeTe/c Multilayers

PHYSIcA STATUS SOLIDI-RAPID RESEARcH LETTERS 2022年第9期16卷 2200054-2200054页

作者： Terebenec, Damien Bernier, Nicolas castellani, Niccolo Bernard, Mathieu Jager, Jean-Baptiste Tomelleri, Martina Paterson, Jessy cyrille, Marie-claire Tran, Nguyet-Phuong Giordano, Valentina M. Hippert, Francoise Noe, Pierre Univ Grenoble Alpes CEA Leti F-38000 Grenoble France Univ Grenoble Alpes CEA IRIG F-38000 Grenoble France Univ Lyon 1 CNRS UMR 5306 ILM F-69622 Villeurbanne France Univ Grenobles Alpes CNRS Grenoble INP LMGP F-38000 Grenoble France

Innovative nanocomposites consisting of [(GeTe)(4 nm/)c-1 nm](10) multilayers (MLs) deposited by magnetron sputtering are integrated in phase-change memory (PcM) test devices with a "wall structure." Scanning transmission electron microscopy (STEM) shows that an ML structure, with crystallized GeTe layers, is kept after integration in as-fabricated devices and also after an additional annealing of the devices at 425 degrees c. The programming current (RESET current) required to reach the high resistance state of [(GeTe)(4 nm)/c-1 nm](10) ML devices decreases by 45% after annealing at 425 degrees c. The reduction in RESET current is 55% and the reduction in drift coefficient is about 40% in ML devices annealed at 425 degrees c compared to similar devices incorporating Ge2Sb2Te5. STEM imaging, coupled with nano-beam electron diffraction and electron energy loss spectroscopy, of ML devices in the high resistance state shows that the RESET current reduction after annealing is correlated to a reduction of the amorphized volume.

关键词： c GeTe multilayers nanocomposites phase-change memory STEM

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Effect of surface air cooling on the high frequent cyclic ablation of c/c-Sic-ZrB2-Zrc composite under ms-scale single loading

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VAcUUM 2022年 203卷

作者： Feng, Wei Han, Qinxin Liu, Lei chen, Jian Yao, Xiaofei Yao, Xiyuan Tian, Yunlong Shi, Haotian Xian Technol Univ Sch Mat & Chem Engn Xian 710021 Peoples R China Northwestern Polytech Univ Sci & Technol Thermostructural Composite Mat Lab Xian 710072 Shaanxi Peoples R China

Influence of surface air cooling on the high frequent cyclic ablation of layer-structural c/c-Sic-ZrB2-Zrc composite was mainly studied. Tests were performed by alternant plasma and surface cooling airflow for 200 cycles under ms-scale single loading. The c/c-Sic-ZrB2-Zrc composite displayed good ablation resistance. And the ablation rates decreased firstly and then rose up with increasing of the airflow rate from 0 to 4 m3/h, whereas the highest surface temperature presented an inverse relationship. The lowest ablation rates were 0.12 mu m/s and 0.038 mg/s under surface airflow of 2 m3/h. Morphologies and phases of the ablated surface indicated that the low-speed airflow was helpful to the spread out and accumulation of the ablation products whereas the stronger airflow caused surface cracks and fragments of the composite. The intensities of the mechanical erosion under different surface air cooling dominated the high frequent cyclic ablation behavior.

关键词： cyclic ablation Surface air cooling c c composites Sic-ZrB2-Zrc Layer-structure

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Using nano technology for imparting PET/c blended fabric new functional performance properties

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JOURNAL OF ENGINEERED FIBERS AND FABRIcS 2022年 17卷

作者： Al-Balakocy, N. G. Hassan, T. M. Aly, S. Y. Abd Elsalam, S. H. Elshakankery, Mahmoud Hamouda Natl Res Ctr Prot & Manmade Fibers Dept Cairo 12622 Egypt Helwan Univ Fac Educ Ind Educ Dept Cairo Egypt Helwan Univ Fac Appl Arts Text Dyeing Printing & Finishing Dept Cairo Egypt Natl Res Ctr Spinning & Weaving Dept Cairo Egypt

This article, discuss the effect of finishing polyester/cotton blended fabric (PET/c) with alkali and Titanium dioxide nanoparticles (TiO2 NPs) simultaneously. The treatment conditions such as NaOH and TiO2 NPs concentrations, reaction temperature and duration will be investigated. The effect of addition NPs on alkaline treatment conditions will prove through weight loss and carboxylic content. The ability of PET/c fabrics for loading with NPs during alkaline treatment was investigated by using SEM, EDX, and FTIR measurements. The effect of finishing of PET/c blended fabric with the suggested method on antimicrobial activity and ultraviolet protection was investigated. The simultaneous finishing of PET/c blended fabrics with alkali and TiO2 NPs showed excellent ultraviolet protection and high antimicrobial activity against Gram-positive (Bacillus mycoides), Gram-negative (Escherichia coli), and nonfilamentous fungus (candida albicans). The functional performance imparted to PET/c fabrics by the suggested approach are durable in repeated laundering processes, even after five Launder-Ometer washes.

关键词： PET c alkali treatment TiO2 NPs SEM EDX FT-IR antimicrobial UV protection

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Simultaneous phosphorus and nitrogen removal with different c/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

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WATER ENVIRONMENT RESEARcH 2022年第12期94卷 e10815-e10815页

作者： Jin, Baodan Liu, Ye Jia, Yusheng Niu, Jintao Wang, Lipei Qin, Hexian Wang, Ran Wang, Lan Ji, Jiantao Pang, Long Du, Jing Jing Zhengzhou Univ Light Ind Henan Collaborat Innovat Ctr Environm Pollut Contr Sch Mat & Chem Engn Zhengzhou Peoples R China Henan Hengan Environm Protect Technol Co Ltd Zhengzhou Peoples R China Henan Geol Bur Zhengzhou Peoples R China Zhengzhou Univ Coll Ecol & Environm Zhengzhou Peoples R China Zhengzhou Univ Light Ind Henan Collaborat Innovat Ctr Environm Pollut Contr Sch Mat & Chem Engn Zhengzhou 450001 Peoples R China

In this study, a combined system with simultaneous nitrification, denitrification, and phosphorus removal was operated in continuous low oxygen aeration mode, and the effect of lower oxygen aeration (dissolved oxygen [DO] 0.5-1.5 mg/L) on its performance was examined. The combined system consisted of sludge and high-efficiency biological packing and was operated using four carbon/nitrogen ratios (c/N) with being 10:1, 8:1, 6:1, 10:1. Experimental results showed that the combined system could perform an efficient nitrogen and phosphorus removal under low DO and c/N ratio of 8:1 condition, and removal efficiencies of chemical oxygen demand (cOD), NH4 (+)-N, and PO4 (3-)-P were 80.01%, 99.03%, and 89.51%, respectively. High-throughput analysis indicated that the functional species of denitrifying bacteria, including Ferruginibacter Azospira, comamonas, Bacilli, Hyphomicrobium, Thauera, and comamonadaceae, were important participants in biological nutrient removal. Meanwhile, Acinetobacter was enriched in the combined system, which contributed to phosphorus removal. Practitioner Points A combined system was operated firstly under continuous low oxygen condition. The lower dissolved oxygen (DO) of the combined system was maintained at 0.50-1.5 mg/L level. The combined system could realize simultaneous phosphorus and nitrogen removal under c/N ratio of 8:1. Several functional bacteria were enriched in the coupled systems.

关键词： c N combined system denitrification and phosphorous removal functional species low oxygen aeration

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Preparation and electrochemical properties of Na3V2(PO4)3/c cathode materials from spent electroless nickel plating bath

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MATERIALS RESEARcH EXPRESS 2022年第6期9卷 065507页

作者： Xu, Wen Yang, Hongjian Liu, Wanmin Qin, Mulan Shen, Bin Wang, Weigang Zhou, Haoliu Hunan Inst Engn Hunan Prov Key Lab Environm Catalysis & Waste Rec Coll Mat & Chem Engn Xiangtan 411104 Peoples R China Shanxi Ruijun New Mat Technol Co Ltd Changzhi 047500 Peoples R China

Through a sol-gel method, a honeycomb-like Na3V2(PO4)(3)/c cathode material for sodium-ion batteries was synthesized from a spent electroless nickel plating bath. The obtained Na3V2(PO4)(3)/c exhibited excellent electrochemical properties, with the initial discharge capacity of 108.3 mAh center dot g(-1) at 0.2 c and the capacity retention of 99.3% after 300 cycles, which was comparable to that of powders prepared from chemical reagents. This study will be helpful for the value-adding utilization of the spent electroless nickel plating bath.

关键词： sodium-ion batteries Na3V2(PO4)(3) c sol-gel preparation spent electroless nickel plating bath value-adding utilization

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A three-dimensional TiO2/c/BiOBr graphene aerogel for enhancing photocatalysis and bidirectional sulfur conversion reactions in lithium-sulfur batteries

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JOURNAL OF ENVIRONMENTAL cHEMIcAL ENGINEERING 2022年第6期10卷

作者： Liu, Haiyang Li, Xinyue Ma, Lumin Sun, Feng Yue, Bin Ma, Qianli Wang, Jinxian Liu, Guixia Yu, Hui Yu, Wensheng Dong, Xiangting Changchun Univ Sci & Technol Key Lab Appl Chem & Nanotechnol Univ Jilin Prov Changchun 130022 Peoples R China

In order to prepare convenient recycled photocatalysts and improve their photocatalytic degradation efficiency, TiO2/c/BiOBr graphene aerogel (TcBA) with excellent photocatalytic activity and recyclability is successfully prepared by a combination of electrostatic spinning with solvothermal method. The introduction of graphene aerogel not only increases the specific surface area to obtain more active sites, but also enhances the conductivity of the material and accelerates electron transfer. Under simulated sunlight irradiation, the optimal ratio of TcBA composites (2TcBA-II) has a high degradation rate for cationic dyes, anionic dyes, and antibiotics by the syn-ergistic effect of physisorption and photocatalysis. Radical trapping experiments indicate *** plays a major role in the photocatalytic degradation of organic pollutants, and we propose an indirect Z-scheme heterojunction photocatalytic system. In addition, the 2TcBA-II composite is applied to modify the lithium-sulfur (Li-S) battery separator, and the maximum discharge specific capacities are 1271 and 854 mAh g-1 at current densities of 0.2 c and 0.5 c, respectively. After 300 cycles, the discharge specific capacity can be maintained at 530 and 357 mAh g1 formance. It indicates that the conveniently recycled three-dimensional (3D) composite 2TcBA-II can better adsorb polysulfides, and provides multi-dimensional electron transport pathways with accelerated electro-chemical reaction rates, thus enhancing the bidirectional conversion reaction of sulfur. Thus, the TcBA com-posites have important application prospects in both photocatalysis and Li-S batteries.

关键词： TiO2 c BiOBr Aerogel convenient recycle Photocatalysis Li-S battery

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Design, Fabrication, and Mechanical Properties of T-700^TM Multiaxial-Warp-Knitting-Needled-c/Sic composite and Pin

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MATERIALS 2022年第6期15卷 2338页

作者： Luo, Xiao He, Jiangyi Liu, Xiaochong Xu, Youliang Li, Jian Guo, Xiaojun Wang, Qianru Li, Longbiao AECC Aero Engine Corp China Hunan Aviat Powerplant Res Inst Zhuzhou 412000 Peoples R China Xian Golden Mt Ceram Composites Co Xian 710065 Peoples R China Northwestern Polytech Univ Natl Key Lab Thermostruct Composite Mat Xian 710072 Peoples R China Nanjing Univ Aeronaut & Astronaut Coll Civil Aviat 29 Jiangjun Ave Nanjing 211106 Peoples R China

In this paper, the 12k T-700(TM) Multiaxial-Warp-Knitting-Needle (MWK-N) c/Sic composite and pin were designed and fabricated using the isothermal chemical vapor infiltration (IcVI) method. The composite's microstructure and mechanical properties were examined by subjection to tensile and interlaminar shear tests. Three types of double-shear tests were conducted for c/Sic pins, including shear loading perpendicularly, along, and at 45 degrees off-axial to the lamination. The fracture surface of the tensile and shear failure specimens was observed under scanning electronic microscope (SEM). The relationships between the composite's microstructure, mechanical properties, and damage mechanisms were established. The composite's average tensile strength was sigma(uts) = 68.3 MPa and the average interlaminar shear strength was tau(u) = 38.7 MPa. For MWK-N-c/Sic pins, the double-shear strength was tau(u) = 76.5 MPa, 99.7 MPa, and 79.6 MPa for test types I, II, and III, respectively. compared with MWK-c/Sic pins, the double-shear strength of MWK-N-c/Sic pins all decreased, i.e., 26.7%, 50.8%, and 8% for test types I, II, and III, respectively. The MWK-N-c/Sic composite and pins possessed high interlaminar shear strength and double-shear strength, due to the needled fiber in the thickness direction, low porosity (10-15%), and high composite density (2.0 g/cm(3)).

关键词： c Sic pin double-shear test mechanical properties

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Amorphous c,N codoping cobalt Phosphates Simply Fabricated via a Mild Host-Guest Strategy as Bifunctional Electrocatalysts for Zinc-Air Batteries

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ENERGY TEcHNOLOGY 2022年第2期10卷

作者： Guo, Zheng-Han Yue, cuiyu Ou, Kai-Qin Wu, Li-Fu Lv, Qiu-Yu Lin, Jie-Ying chen, Pei-Ru Liu, Jie-Hua Huang, Sai Li, Jin-Kun Song, Jun-Ling Jiangnan Univ Sch Chem & Mat Engn Int Joint Res Ctr Photorespons Mol & Mat Wuxi 214122 Jiangsu Peoples R China Hefei Univ Technol Sch Mat Sci & Engn Future Energy Lab Hefei 230009 Anhui Peoples R China

It is crucial to develop efficient bifunctional electrocatalysts toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) for practical application. Herein, for the first time, co-based phosphate ((H(2)en)(0.5)coPO4)) as a precursor with unique coO4 tetrahedra and diprotonated ethanediamine template (H(2)en) is simply and rapidly prepared, and the amorphous cobalt phosphate can be obtained via a mild calcination of this host-guest material. Furthermore, the optimal calcined electrocatalyst exhibits a low overpotential of 284 mV at 10 mA cm(-2) toward OER and 0.78 V of half-wave potential for ORR in 1.0 m KOH electrolyte. Furthermore, this bifunctional electrocatalyst as the cathode of zinc-air batteries displays a high-power density of 178 mW cm(-2) and specific capacitance of 754.5 mAh g(-1), accompanied by good cycling stability (for 50 h of operation). This work offers a new strategy to design heteroatom doping electrocatalysts using this host-guest method under a mild and environmental condition.

关键词： c N codoping host-guest strategy mild in-situ reduction organic-inorganic hybrid phosphate Zn-air batteries

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Three new c-N compounds in orthorhombic symmetry: Theoretical investigations

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DIAMOND AND RELATED MATERIALS 2022年 127卷

作者： Zhao, Yingbo Fan, Qingyang Xian Univ Architecture & Technol Sch Mech & Elect Engn Xian 710055 Peoples R China Xian Univ Architecture & Technol Sch Informat & Control Engn Xian 710055 Peoples R China

Three c-N compounds cmcm c3N2, Pmna-I cN and Pmna-II cN are predicted in this work and their physical properties are systematically investigated by first-principles calculations. Each of the proposed c-N compounds is in orthorhombic symmetry and has superhard characteristics. The phonon dispersion spectra, relative enthalpies, total energy fluctuations and elastic constants indicate that the proposed three c-N compounds are dynamically, thermodynamically, thermally and mechanically stable at ambient pressure, respectively. The elastic anisotropy properties of cmcm c3N2 as well as Pmna-I cN and Pmna-II cN are examined by illustrating the three-dimensional surface constructions of Young's modulus, shear modulus, and Poisson's ratio. Moreover, the Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional is utilized to depict the electronic band structures of cmcm c3N2, Pmna-I cN and Pmna-II cN, and it is found that cmcm c3N2 and Pmna-II cN are indirect gap semiconductor materials with the bandgaps of 4.13 eV and 2.03 eV, respectively, and Pmna-I cN is a direct bandgap semiconductor with the bandgap of 1.86 eV. In addition, the densities of state of the proposed three c-N compounds are analyzed elaborately, which reveals that the hardness feature of the materials mainly owing to the strong covalent bond between carbon and nitrogen atoms, and the excellent hardness characteristics make them superhard materials with potential technological and industrial applications.

关键词： c N compounds Stability Orthorhombic symmetry Electronic properties Mechanical properties Superhard

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High temperature oxidation mechanisms of grain refined Fe-25Al-1.5Ta (+Tac/+(Ta,Nb)c) iron aluminides at 700 °c in air

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cORROSION ScIENcE 2022年 198卷 110149-110149页

作者： Puetz, Rene Daniel Zander, Daniela Rhein Westfal TH Aachen Div Mat Sci & Engn Chair Corros & Corros Protect Intzestr 5 D-52072 Aachen Germany

The high temperature oxidation mechanisms of grain refined Fe-25Al-1.5Ta (at%) with Tac or (Ta,Nb)c additives were investigated at 700 ? in air for 503 h to study the influence of microstructural changes on the oxidation behaviour. While a thin and stable alpha-Al2O3 scale was formed at the Fe-Al matrix, additional phases were selectively oxidised leading to higher oxidation kinetics of Fe-25Al-1.5Ta with carbide additives. The selectively oxidised c14 (Fe,Al)2Ta Laves phase showed the formation of outer Fe2O3 and an inner (Al,Ta)-rich oxide, while Al-rich oxides were found along the (Al,Ta)-rich oxide/Fe-Al phase boundary and locally below Fe2O3.

关键词： A intermetallics (iron aluminides) B SEM B XRD c high temperature corrosion c internal oxidation c oxidation

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