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Effective desalination and anti-biofouling performance via surface immobilized MWCNTs on RO membrane

Chinese Journal of Chemical engineering 2023年第4期56卷 33-45页

作者： Aneela Sabir Wail Falath Muhammad Shafiq Nafisa Gull Maria Wasim Karl IJacob School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGAUSA G.W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGAUSA Institute of Polymer of Textile Engineering University of the PunjabLahore 54590Pakistan Department of Mechanical Engineering King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia

Desalination is considered a viable method to overcome the issue of water scarcity either from waste water or seawater. For this purpose, this study employed a facile approach to develop surface immobilized oxidized-MWCNTs(o-MWCNTs) onto crosslinked polyvinyl alcohol(PVA) membrane. Firstly, modified polysulphone substrate was synthesized on to which crosslinked PVA layer was spread onto it. PVA layer act as active layer for surface immobilization of o-MWCNTs in varying concentration. The functional group analysis, morphology and roughness of membranes surface was conducted out using FTIR, SEM and AFM respectively. The results showed that modified membranes, immobilized o-MWCNTs enhanced the salt rejection(Na_(2)SO_(4)) upto 99.8%. After contacting with Escherichia coli and Staphylococcus aureus for 2.5 h the bacteria mortalities of the fabricated membrane could reach 96.9%. Furthermore, the antibiofouling tests showed that OP-MWCNTs(1-5) modified membranes have higher anti-biofouling property than the control membrane.

关键词： Surface immobilized Reverse osmosis Multi walled carbon nanotubes Nanomaterials

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Optimizing FeCoNiCrTi high-entropy alloy with hydrogen pumping effect to boost de/hydrogenation performance of magnesium hydride

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Rare Metals 2024年第7期43卷 3273-3285页

作者： Meng-Chen Song Fu-Ying Wu Yi-Qun Jiang Xiu-Zhen Wang Hu Zhao Li-Xin Chen Liu-Ting Zhang School of Energy and Power Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China Max Planck Institute for Iron Research 40237DuisseldorfGermany School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The exploration of efficient,long-lived and cost-effective transition metal catalysts is highly desirable for the practical hydrogen storage of magnesium hydride(MgH_(2)) in sustainable energy ***,FeCoNiCrTi high-entropy alloy(HEA) nanosheets were prepared via a facile wet chemical ball milling strategy and they were introduced into MgH_(2) to boost the hydrogen storage *** refined HEA exhibited superior catalytic activity on MgH_(2).In contrast to additive-free MgH_(2),the initial desorption temperature of the constructed MgH_(2)-HEA composite was reduced from 330.0 to 198.5℃ and a remarkable 51% reduction in the dehydrogenation activation energy was ***,the MgH_(2)-HEA composite only required one-twentieth time of that consumed by pure MgH_(2) to absorb 5.0 wt% of H_(2) at 225℃.The synergy between the "hydrogen pumping" effect of Mg_2Ni/Mg_2NiH_4 and Mg_2Co/Mg_2CoH_5 couples,as well as the good dispersion of Fe,Cr and Ti on the surface of MgH_(2) contributed to the enhanced de/hydrogenation performance of the MgH_(2)-HEA *** study furnishes important steering for the design and fabrication of multiple transition metal catalysts and may push the commercial application of magnesium-based hydrides one step forward.

关键词： Hydrogen storage Magnesium hydride High-entropy alloys Catalysis

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A deep neural network regressor for phase constitution estimation in the high entropy alloy system Al-Co-Cr-Fe-Mn-Nb-Ni

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npj Computational materials 2023年第1期9卷 1661-1674页

作者： G.Vazquez S.Chakravarty R.Gurrola R.Arróyave Department of Materials Science and Engineering Texas A&M UniversityCollege Station 77843 TXUSA Department of Mechanical Engineering Texas A&M UniversityCollege Station 77843 TXUSA Department of Industrial and Systems Engineering Texas A&M UniversityCollege Station 77843 TXUSA

High Entropy Alloys(HEAs)are composed of more than one principal element and constitute a major paradigm in metals *** HEA space is vast and an exhaustive exploration is ***,a thorough estimation of the phases present in the HEA is of paramount importance for alloy *** Learning presents a feasible and non-expensive method for predicting possible new HEAs on-the-fly.A deep neural network(DNN)model for the elemental system of:Mn,Ni,Fe,Al,Cr,Nb,and Co is developed using a dataset generated by high-throughput computational thermodynamic calculations using *** features list used for the neural network is developed based on literature and freely available databases.A feature significance analysis matches the reported HEAs phase constitution trends on elemental properties and further expands it by providing so far-overlooked *** final regressor has a coefficient of determination(r^(2))greater than 0.96 for identifying the most recurrent phases and the functionality is tested by running optimization tasks that simulate those required in alloy *** DNN developed constitutes an example of an emulator that can be used in fast,real-time materials discovery/design tasks.

关键词： alloy neural network

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Artificial neural networks modelling for surface roughness in wire electrical discharge machining of Incoloy 800H 15

Artificial neural networks modelling for surface roughness i...

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15th International Conference on Computing Communication and Networking Technologies, ICCCNT 2024

作者： Paturi, Uma Maheshwera Reddy Goturi, Sheshank Reddy Bhojane, Omkar Sunil Sahasra Konidhala, Nandan Nudurupati, Achintya Vamshi Reddy, N.S. Cvr College of Engineering Department of Mechanical Engineering Telangana Hyderabad India Gyeongsang National University School of Materials Science and Engineering Jinju Korea Republic of

ISBN: (纸本)9798350370249

The use of artificial neural networks (ANNs) in optimizing process parameters and model development has gained attention due to their ability to predict timely and accurate outputs. The current study uses ANNs to predict surface roughness during wire electrical discharge machining (WEDM) of Incoloy 800H. The prediction model utilizes a multilayer perception based on back-propagation neural network (BPNN). In neural network modelling, network weights and bias values were updated, and the process output was estimated using the Levenberg-Marquardt backpropagation training function (trainlm) and a hyperbolic tangent sigmoid (tansig) transfer function, respectively. The ANN model comprises one output neuron (surface roughness) and five input neurons (pulse on, pulse off, wire tension, servo voltage, and wire feed rate). WEDM experimental data is divided into training, testing, and validation in the ratio of 70%:15%:15%. The results show that the optimal ANN model with 5-11-1 topology provides an accurate estimate of surface roughness, with a correlation coefficient of 0.997. The proposed ANN model can predict WEDM process parameters quickly and effectively. © 2024 IEEE.

关键词： Artificial neural networks Incoloy 800H Modelling Surface roughness WEDM

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Unraveling abnormal buried interface anion defect passivation mechanisms depending on cation-induced steric hindrance for efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2023年第5期80卷 1-9,I0001页

作者： Dongmei He Ru Li Baibai Liu Qian Zhou Hua Yang Xuemeng Yu Shaokuan Gong Xihan Chen Baomin Xu Shangfeng Yang Jiangzhao Chen Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Bejing 100049Chin SUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhen 518055GuangdongChin Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Although ionic liquids(ILs)have been widely employed to heal the defects in perovskite solar cells(PSCs),the corresponding defect passivation mechanisms are not thoroughly understood up to ***,we first reveal an abnormal buried interface anion defect passivation mechanism depending on cationinduced steric *** IL molecules containing the same anion([BF4]^(-))and different sizes of imidazolium cations induced by substituent size are used to manipulate buried *** was revealed what passivated interfacial defects is mainly anions instead of *** and experimental results demonstrate that the large-sized cations can weaken the ionic bond strength between anions and cations,and facilitate the interaction between anions and SnO2as well as perovskites,which is conducive to interfacial defect passivation and ameliorating interfacial *** can be concluded that interfacial chemical interaction strength and defect passivation effect are positively correlated with the size of *** discovery breaks conventional thinking that large-sized modification molecules would weaken their chemical interaction with *** with the control device(21.54%),the device based on 1,3-Bis(1-adamantyl)-imidazolium tetrafluoroborate(BAIMBF4)with maximum size cations achieves a significantly enhanced efficiency of 23.61%along with much increased moisture,thermal and light stabilities.

关键词： Perovskite solar cells Buried interface Ionic liquid Anion defect passivation mechanism Cation-induced steric hindrance

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Symmetry breaking in spoke double-ring structures formed by buckling-guided 3D assembly

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Theoretical & Applied Mechanics Letters 2025年第1期15卷 25-31页

作者： Xiaoran Yang Jianzhong Zhao Alexander Hartmaier Yonggang Huang Yihui Zhang Applied Mechanics Laboratory Department of Engineering MechanicsTsinghua UniversityBeijing 100084China Laboratory of Flexible Electronics Technology Tsinghua UniversityBeijing 100084China Interdisciplinary Center for Advanced Materials Simulation(ICAMS) Ruhr-Universität BochumBochum 44801Germany Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA

The buckling-guided three-dimensional(3D)assembly method has arisen increasing attention for its advantages in forming complex 3D architectures with a rich diversity of geometric shapes in a broad spectrum of inorganic functional *** an assembly method relies on the controlled lateral bucking of a 2D precursor structure integrated with a pre-stretched substrate at selective *** the assembly process,the preservation or break-ing of rotational symmetry is crucial for understanding the mechanism of 2D-to-3D geometric ***,we present a fundamental study on the rotational symmetry of 3D spoke double-ring structures formed through buckling-guided *** energetic method is introduced to analyze the rotational symmetry and to understand the symmetry-breaking *** symmetry-breaking phenomenon is validated by experi-ments and finite element analyses(FEA).Phase diagrams of the deformation mode are established to shed light on the influences of various geometric parameters(e.g.,initial rotational symmetry order,radius ratio,and lo-cation of bonding sites).This work offers new insights into the underlying mechanism of 2D-to-3D geometric transformation in ribbon-type structures formed by compressive buckling.

关键词： Buckling-guided 3D assembly Rotational symmetry Post-buckling Instability

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Effects of Al addition and cryogenic cyclic treatment on impact toughness of phase-transformable Ti-based bulk metallic glass composites

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Journal of materials science & Technology 2023年第9期140卷 210-220页

作者： Tingyi Yan Long Zhang R.Lakshmi Narayan Jingyu Pang Yi Wu Huameng Fu Hong Li Upadrasta Ramamurty Haifeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Materials Science and Engineering Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India Department of Mechanical and Aerospace Engineering in Nanyang Technological University Singapore 637331Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A∗STAR)Singapore 138634Singapore

Developing bulk metallic glass composites(BMGCs)with high toughness is vital for their practical ***,the influence of different microstructures on the impact toughness of BMGCs is still *** effects of Al addition and cryogenic cyclic treatment(CCT)on the Charpy impact toughness,a K,at 298 and 77 K of a series of phase-transformable BMGCs are investigated in this *** is found that deformation-induced martensitic transformation(DIMT)of theβ-Ti dendrites is the dominant toughening mechanism in the phase-transformable BMGCs at 298 K,but at 77 K,the toughness of BMGCs is primarily determined by the intrinsic toughness of the glass *** addition of Al can moderately tune theβ-Ti phase stability,which then affects the amount of DIMT and impact toughness of the BMGCs at 298 ***,at 77 K,Al addition causes a monotonic decrease in the toughness of the BMGCs due to the embrittlement of the glass *** is found that CCT can effectively rejuvenate the phase-transformable BMGCs,which results in an enhanced impact toughness at 298 ***,the toughness at 77 K monotonously decreases with increasing the number of CCT cycles,suggesting that the rejuvenation of the glass matrix affects the toughness at both 298 and 77 K of BMGCs,but in dramatically different *** findings reveal the influence of microstructures and CCT on the impact toughness of BMGCs and provide insights that could be useful for designing tougher BMGs and BMGCs.

关键词： Bulk metallic glass composites Charpy impact toughness Deformation-induced martensitic transformation Metastability Thermal cycling rejuvenation

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X-ray and molecular dynamics study of the temperature-dependent structure of molten NaF-ZrF4

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Physical Review materials 2024年第7期8卷 075402-075402页

作者： Anubhav Wadehra Rajni Chahal Shubhojit Banerjee Alexander Levy Yifan Zhang Haoxuan Yan Daniel Olds Yu Zhong Uday Pal Stephen Lam Karl Ludwig Division of Materials Science and Engineering Chemical Science Division Department of Chemical Engineering Department of Mechanical Engineering Department of Mechanical and Materials Engineering National Synchrotron Light Source II Department of Physics

The local atomic structure of NaF-ZrF4 (53–47 mol%) molten system and its evolution with temperature are examined with x-ray scattering measurements which are then used to validate the quality of ab initio and neural network-based molecular dynamics (NNMD) calculations in the temperature range 515−700∘C. The machine-learning enhanced NNMD calculations offer improved efficiency while maintaining accuracy at higher distances compared to ab initio calculations. Looking at the evolution of the pair distribution function with increasing temperature, a fundamental change in the liquid structure within the selected temperature range, accompanied by a slight decrease in overall correlation is revealed. NNMD calculations indicate the coexistence of three different fluorozirconate complexes: [ZrF6]2−, [ZrF7]3−, and [ZrF8]4−, with a shift in the dominant coordination state from the 7-coordinated Zr cation toward a 6-coordinated cation with increasing temperature. The study also highlights the metastability of different local coordination structures, with frequent interconversions between the 6- and 7-coordinate states. Analysis of the Zr-F-Zr angular distribution function reveals the presence of both “edge-sharing” and “corner-sharing” fluorozirconate complexes with specific bond angles and distances in accord with previous studies, while the next-nearest-neighbor cation-cation correlations demonstrate a clear preference for unlike cations as nearest-neighbor pairs, emphasizing nonrandom arrangement. These findings contribute to a comprehensive understanding of the complex local structure of the molten salt, providing insights into temperature-dependent preferences and correlations within the molten system.

关键词： Atomic & molecular structure Ionic fluids Liquids Ab initio molecular dynamics Machine learning X-ray pair-distribution function analysis X-ray scattering

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Effect of Ti contents on microstructure， mechanical properties， and corrosion behavior of ultrafine-grained b-type Zr–Ti–Nb alloys

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Transactions of Nonferrous Metals Society of China 2025年

作者： Mieczyslaw JURCZYK Katarzyna ARKUSZ Kamila PASIK Marek NOWAK Piotr SIWAK Kamil KOWALSKI Mieczyslawa U.JURCZYK Department of Biomedical Engineering， Faculty of Mechanical Engineering， University of Zielona Góra Institute of Materials Science and Engineering， Faculty of Materials Engineering and Technical Physics， Poznań University of Technology Institute of Mechanical Technology， Faculty of Mechanical Engineering， Poznań University of Technology Division of Mother's and Child's Health， Poznań University of Medical Sciences

A new ultrafine-grained Zr-based ternary Zr–Ti–Nb alloy with β crystal structure was synthesized. It has been shown that mechanical alloying of Zr76–Nb24 (wt.%) supported by cold pressing and sintering at the temperature of 1000 °C can be applied to synthesize bulk single phase β-Zr-type alloy. Increasing the content of titanium in Zr76-x–Tix– Nb24 system reduced the content of the β-Zr phase (Zr0.5–Ti0.3–Nb0.2) from 91.2 to 85.7 wt.% for x = 8 and 16， respectively. Nanoindentation tests revealed that the mechanical properties of ternary Zr–Ti–Nb alloys were influenced by titanium contents in the Zr–Nb system. The value of Young’s modulus 57.9 ± 12.4 GPa was obtained for bulk Zr60–Ti16–Nb24 alloy. The corrosion resistance of the Zr68–Ti8– Nb24 alloy compared to cp-Ti and Zr metals was improved considerably. These properties make Zr–Ti–Nb biomaterial attractive in implant applications.

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High sound pressure piezoelectric micromachined ultrasonic transducers using sputtered potassium sodium niobate

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Microsystems & Nanoengineering 2024年第6期10卷 311-323页

作者： Fan Xia Yande Peng Wei Yue Mingze Luo Megan Teng Chun-Ming Chen Sedat Pala Xiaoyang Yu Yuanzheng Ma Megha Acharya Ryuichi Arakawa Lane W.Martin Liwei Lin Department of Mechanical Engineering University of CaliforniaBerkeleyCA 94720USA School of Electronic Science and Engineering Southeast UniversityNanjingJiangsu 210096China Bioengineering and Biomedical Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Department of Materials Science and Engineering University of CaliforniaBerkeleyCA 94720USA Scientific Research Laboratory Div. Niterra Co.LtdNagoya 461-0005Japan Departments of Materials Science and NanoEngineering Chemistryand Physics and Astronomy and the Rice Advanced Materials InstituteRice UniversityHoustonTX 77005USA

This work presents air-coupled piezoelectric micromachined ultrasonic transducers(pMUTs)with high sound pressure level(SPL)under low-driving voltages by utilizing sputtered potassium sodium niobate K0.34Na0.66NbO3(KNN)films.A prototype single KNN pMUT has been tested to show a resonant frequency at 106.3 kHz under 4 Vp-p with outstanding characteristics:(1)a large vibration amplitude of 3.74μm/V,and(2)a high acoustic root mean square(RMS)sound pressure level of 105.5 dB/V at 10 cm,which is 5–10 times higher than those of AlN-based pMUTs at a similar *** are various potential sensing and actuating applications,such as fingerprint sensing,touch point,and gesture *** this work,we present demonstrations in three fields:haptics,loudspeakers,and *** haptics,an array of 15×15 KNN pMUTs is used as a non-contact actuator to provide a focal pressure of around 160.3 dB RMS SPL at a distance of 15 *** represents the highest output pressure achieved by an airborne pMUT for haptic sensation on human *** used as a loudspeaker,a single pMUT element with a resonant frequency close to the audible range at 22.8 kHz is *** is shown to be able to generate a uniform acoustic output with an amplitude modulation *** the rangefinder application,pulse-echo measurements using a single pMUT element demonstrate good transceiving results,capable of detecting objects up to 2.82 m *** such,this new class of high-SPL and low-driving-voltage pMUTs could be further extended to other applications requiring high acoustic pressure and a small form factor.

关键词： potassium piezoelectric sound

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