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Novel spent bleaching earth industrial waste as low-cost ceramic membranes material: elaboration and characterization

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materials Today: Proceedings 2023年 87卷 136-140页

作者： Rahma A. Elma M. Roil Bilad M. Isnasyauqiah Rahman Wahid A. Sirajul Huda M. Resa Lamandau D. Doctoral Program of Environemntal Science Postgraduate Program Lambung Mangkurat University Jl Brigjen H. Hasan Basri Kayutangi South Kalimantan Banjarmasin 70123 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Chemical Engineering Department Engineering Faculty Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Gedung BE1410 Brunei Darussalam

Ceramic membrane support derived from spent bleaching earth (SBE) become a novel study due to their low-cost, sustainable features, abundance material, and there is not yet applicated as membrane. In this study, flat disk ceramic membrane configuration was fabricated and characterized from solid waste of crude palm oil bleaching process by pressing method in different SBE loading mass (38–42 %wt.). The SBE as raw material was deoiled using n-hexane and acetone solvent, followed by fabricated it become flat disk SBE membranes. Afterward, the SBE flat disk membranes was characterized through fourier-transform infrared spectroscopy (FTIR) and X-ray fluorescence (XRF) analyzer. The result exhibits the flat disk SBE ceramic membrane has dimension of 41 and 6 mm for diameter and thickness, respectively. SBE membranes indicating have montmorillonite structure due to presence of silica as main component materials of SBE. Besides that, the existence of siloxane vibration band in SBE membranes for the sample after regeneration with n-hexane and acetone were dominated over using raw SBE. It concludes the oil residue was removed and produced SBE membrane properties become robust with less organic contaminant. © 2023

关键词： Ceramic membrane CPO Pressing method SBE Support

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Oscillatory Nature of Melt-Gas-Powder Interactions in Laser Powder Bed Fusion Unraveled by Physics-Based Multiphase Modelling

SSRN

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SSRN 2024年

作者： Yuan, Weihao Chen, Hui Ruan, Siyuan Lupoi, Rocco Qin, Shaocong Guo, Enyu Yin, Shuo Trinity College Dublin The University of Dublin Department of Mechanical Manufacturing and Biomedical Engineering Dublin 2 Ireland State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shanxi Xi'An710072 China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China

During the laser powder bed fusion (LPBF) process, laser-material interaction ignites complex dynamic physical phenomena incorporating the melt pool, gas and powder, which jointly influences the process stability. While in-situ and off-situ monitoring techniques are powerful for specialized issues, they often cannot be seamlessly integrated to provide a comprehensive view. Therefore, an advanced modelling technique is a critical solution. This study explores the transient interactions in the melt-gas-powder system with a focus on the effect of laser scan speed through an advanced physics-based multiphase modelling approach. A relationship is found between laser scan speed and vapor flow angle (VFA), with higher laser scan speed leading to broader VFA. The metal vapor exhibits "swing effect", subsequently evolving into a periodic behavior when the laser scan speeds are intermediate (0.5 m/s and 0.7 m/s). Such periodicity is resulted from the fluctuations of locally intensified pressure (LIP) on the keyhole walls (KWs). Simultaneously, the periodic vapor patten induces periodic movements of two vortex flows with opposite swirling direction, which further exerts periodic drag force on the powder. The revealed oscillatory yet periodic nature in the melt-gas-powder interaction demystifies its traditionally perceived "complex" behaviors, offering deep understanding into the mechanisms governing the LPBF process. This study also highlights the necessity of a stable periodicity and supports the feasibility of using frequency-sensitive sensors for real-time monitoring of various process anomalies. © 2024, The Authors. All rights reserved.

关键词： Vortex flow

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Towards Strength-Ductility Synergy in a Weak-Textured Mg-3y Extruded Sheet Via Pre-Twinning and Annealing

SSRN

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SSRN 2023年

作者： Li, Tianjiao Zheng, Jiang Gupta, Manoj Xia, Lihong He, Liuyong Liu, Shuaishuai Xia, Dabiao Luo, Jinru Jiang, Bin College of Materials Science and Engineering Chongqing University Chongqing400044 China Department of Mechanical Engineering National University of Singapore Singapore117578 Singapore Shenyang National Laboratory for Materials Science Chongqing University Chongqing400044 China College of Mechanical Engineering Chongqing Technology and Business University Chongqing400067 China The Center of New Energy Materials and Manufacturing Jihua Laboratory Foshan528000 China Suzhou Laboratory Suzhou215004 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing400044 China

Mg-RE (magnesium-rare earth) binary alloys, such as Mg-Y alloys, usually exhibit weakened texture and excellent plasticity compared with traditional RE-free Mg alloys. However, the weakened texture could lead to a significant decrease in the strength of Mg-RE binary alloys. In this work, the weak-textured Mg-3Y (wt. %) extruded sheet displayed good strength-ductility synergy with a 41% increase in the yield strength and a good ductility similar to the initial sheet via simple pre-twinning and annealing treatment (PT). After PT, the average grain size of the sheet decreased from 11.2 μm to 6.0 μm and 34.2% initial soft texture component ( // normal direction (ND)) was transformed into the hard texture component ( // transverse direction (TD)). The effect of pre-twinning on deformation mechanisms was systematically investigated by slip trace analysis and activation stress (τ) analysis. Basal slip was the dominant deformation mechanism during the tension of the as-extruded (AE) specimen while pre-twinning promoted the activation of non-basal slip, especially prismatic slip in the PT specimen. The texture transformation and reduced resolved critical shear stress (CRSS) ratio between basal slip and non-basal slip induced by pre-twinning were primarily responsible for the high activity of non-basal slip. The underlying strengthening mechanism and the reason for good ductility were also rationally discussed. The strengthening effect of single grain refinement was relatively lower in the weak-textured Mg-3Y alloy. Texture hardening could effectively improve the effect of fine-grain strengthening. The excellent deformation compatibility between basal slip of parent grains and prismatic slip of twins as well as relatively higher activity of the second-order pyramidal slip was the origin of the good ductility of the PT specimen. © 2023, The Authors. All rights reserved.

关键词： Binary alloys

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Wide-range continuous tuning of the thermal conductivity of La0.5Sr0.5CoO3-δ films via room-temperature ion-gel gating

arXiv

引用

arXiv 2023年

作者： Zhang, Yingying Postiglione, William M. Xie, Rui Zhang, Chi Zhou, Hao Chaturvedi, Vipul Heltemes, Kei Zhou, Hua Feng, Tianli Leighton, Chris Wang, Xiaojia Department of Mechanical Engineering University of Minnesota MinneapolisMN55455 United States Department of Chemical Engineering and Materials Science University of Minnesota MinneapolisMN55455 United States Department of Mechanical Engineering University of Utah Salt Lake CityUT84112 United States Advanced Photon Source Argonne National Laboratory LemontIL60439 United States

Solid-state control of the thermal conductivity of materials is of exceptional interest for novel devices such as thermal diodes and switches. Here, we demonstrate the ability to continuously tune the thermal conductivity of nanoscale films of La0.5Sr0.5CoO3-δ (LSCO) by a factor of over 5, via a room-temperature electrolyte-gate-induced non-volatile topotactic phase transformation from perovskite (with δ ≈ 0.1) to an oxygen-vacancy-ordered brownmillerite phase (with δ = 0.5), accompanied by a metal-insulator transition. Combining time-domain thermoreflectance and electronic transport measurements, model analyses based on molecular dynamics and Boltzmann transport, and structural characterization by X-ray diffraction, we uncover and deconvolve the effects of these transitions on heat carriers, including electrons and lattice vibrations. The wide-range continuous tunability of LSCO thermal conductivity enabled by low-voltage (below 4 V) room-temperature electrolyte gating opens the door to non-volatile dynamic control of thermal transport in perovskite-based functional materials, for thermal regulation and management in device applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Perovskite

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Title: Robust Super-Moiré in Large Angle Single-Twist Bilayers

arXiv

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arXiv 2025年

作者： Li, Yanxing Shi, Chuqiao Zhang, Fan Liu, Xiaohui Xue, Yuan Ha, Viet-Anh Gao, Qiang Dong, Chengye Lin, Yu-Chuan Holtsman, Luke N. Morales-Durán, Nicolas Kim, Hyunsue Jiang, Yi Holbrook, Madisen Hone, James Barmak, Katayun Robinson, Joshua Li, Xiaoqin Giustino, Feliciano Khalaf, Eslam Han, Yimo Shih, Chih-Kang Department of Physics The University of Texas at Austin AustinTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States Department of Physics Harvard University CambridgeMA United States Oden Institute for Computational Engineering and Sciences The University of Texas at Austin AustinTX United States Department of Materials Science and Engineering Pennsylvania State University University ParkPA United States Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Applied Physics and Applied Mathematics Columbia University New York CityNY United States Advanced Photon Source Argonne National Laboratory LemontIL United States Department of Mechanical Engineering Columbia University New York CityNY United States

Forming long wavelength moiré superlattices (MSL) at small-angle twist van der Waals (vdW) bilayers has been a key approach to creating moiré flat bands1–8. The small-angle twist, however, leads to strong lattice reconstruction, causing domain walls and moiré disorders, which pose considerable challenges in engineering such platforms6–10. At large twist angles, the rigid lattices render a more robust, but shorter wavelength MSL, making it difficult to engineer flat bands. Here, we depict a novel approach to tailoring robust super-moiré (SM) structures that combines the advantages of both small-twist and large-twist transition metal dichalcogenides (TMDs) bilayers using only a single twist angle near a commensurate angle. Structurally, we unveil the spontaneous formation of a periodic arrangement of three inequivalent commensurate moiré (CM) stacking, where the angle deviation from the commensurate angle can tune the periodicity. Electronically, we reveal a large set of van Hove singularities (VHSs) that indicate strong band hybridization, leading to flat bands near the valence band maximum. Our study paves the way for a new platform of robust SM bilayers with structural rigidity and controllable wavelength, extending the investigation of the interplay among band topology, quantum geometry, and moiré superconductivity to the large twist angle regime. Copyright © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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Why Room Temperature GeSn Lasers Need Carbon

Why Room Temperature GeSn Lasers Need Carbon

引用

IEEE International Conference on Group IV Photonics

作者： Tuhin Dey Augustus W. Arbogast Qian Meng Shamim Reza Aaron Muhowski Joshua Cooper Rachel S. Goldman Thales Borrely Seth R. Bank Mark A. Wistey Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas USA Department of Physics Texas State University San Marcos Texas USA Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas USA Department of Materials Science and Engineering University of Michigan Ann Arbor MI USA Departments of MSE Physics and EECS University of Michigan Ann Arbor MI USA Department of Physics and MSEC Program Texas State University San Marcos Texas USA

Device models show GeSn lasers are limited by weak electron and photon confinement. Adding carbon offers strong conduction band offsets, freeing SiGeSn layers for separate confinement heterostructures, reducing thresh...

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Towards End-to-End Structure Solutions from Information-Compromised Diffraction Data via Generative Deep Learning

arXiv

引用

arXiv 2023年

作者： Guo, Gabe Goldfeder, Judah Lan, Ling Ray, Aniv Yang, Albert Hanming Chen, Boyuan Billinge, Simon J.L. Lipson, Hod Columbia University Department of Computer Science New YorkNY10027 United States Columbia University Department of Applied Physics and Applied Mathematics New YorkNY10027 United States Duke University Department of Mechanical Engineering and Materials Science DurhamNC27708 United States Columbia University Department of Mechanical Engineering New YorkNY10027 United States

The revolution in materials in the past century was built on a knowledge of the atomic arrangements and the structure-property relationship. The sine qua non for obtaining quantitative structural information is single crystal crystallography. However, increasingly we need to solve structures in cases where the information content in our input signal is significantly degraded, for example, due to orientational averaging of grains, finite size effects due to nanostructure, and mixed signals due to sample heterogeneity. Understanding the structure property relationships in such situations is, if anything, more important and insightful, yet we do not have robust approaches for accomplishing it. In principle, machine learning (ML) and deep learning (DL) are promising approaches since they augment information in the degraded input signal with prior knowledge learned from large databases of already known structures. Here we present a novel ML approach, a variational query-based multi-branch deep neural network that has the promise to be a robust but general tool to address this problem end-to-end. We demonstrate the approach on computed powder x-ray diffraction (PXRD), along with partial chemical composition information, as input. We choose as a structural representation a modified electron density we call the Cartesian mapped electron density (CMED), that straightforwardly allows our ML model to learn material structures across different chemistries, symmetries and crystal systems. When evaluated on theoretically simulated data for the cubic and trigonal crystal systems, the system achieves up to 93.4% average similarity with the ground truth on unseen materials, both with known and partially-known chemical composition information, showing great promise for successful structure solution even from degraded and incomplete input data. The approach doesn’t presuppose a crystalline structure and the approach are readily extended to other situations such as nanomaterials and te

关键词： Carrier concentration

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Development of an Optical Sensor for the Detection of 2,2-Dichloro Vinyl Dimethyl Phosphate (DDVP) Using Nickel–Benzene-1,4 dicarboxylic acid Metal–Organic Framework (Ni-BDC-MOF)

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2024年第7期1卷 1605-1611页

作者： Lakshya Sankhla Ravi Patel Himmat Singh Kushwaha Undergraduate Department Indian Institute of Science (IISc) Bengaluru 560012 India Mechanical and Industrial Engineering Department IIT Roorkee Roorkee 247667 India Materials Research Centre Malaviya National Institute of Technology (MNIT) Jaipur 302017 India Shodh Lab Suresh Gyan Vihar University Jaipur 302017 India

Pesticide monitoring has received considerable attention in the past couple of decades because uncontrolled use of pesticides has resulted in significant risks to the ecosystem, animal bodies, and humans. This study confers a novel approach to detecting 2,2-dichloro vinyl dimethyl phosphate (DDVP) organophosphate pesticides using fluorescence quenching. Herein, a novel nickel–benzene-1,4 dicarboxylic acid metal–organic framework (Ni-BDC-MOF) is synthesized. The solvothermal method is used to synthesize the metal–organic framework of the nickel ion. Ni-BDC-MOF highlights good sensitivity, selectivity, and rapid luminous response to DDVP with 47.31 nM as the detection limit. Further, our suggested optical sensor was assessed for selectivity and real-world samples. This selectivity indicates the sensor’s potential for accurately assessing DDVP in the complex matrices present in wastewater, and it opens up new applications for environmental monitoring. This sensor can be highly beneficial in enhancing environmental monitoring and treatment methods, given the emergence of DDVP contamination. The advancement of selectivity, sensitivity, and applicability in complex contexts such as wastewater or environmental detection contributes to further improving DDVP detection.

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Robotic Laser Orientation Planning with a 3D Data-driven Method

arXiv

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arXiv 2022年

作者： Ma, Guangshen Ross, Weston Codd, Patrick J. Department of Mechanical Engineering and Materials Science Duke University United States Department of Neurosurgery Duke University Medical Center United States

This paper focuses on a research problem of robotic controlled laser orientation to minimize errant overcutting of healthy tissue during the course of pathological tissue resection. Laser scalpels have been widely used in surgery to remove pathological tissue targets such as tumors or other lesions. However, different laser orientations can create various tissue ablation cavities, and incorrect incident angles can cause over-irradiation of healthy tissue that should not be ablated. This work aims to formulate an optimization problem to find the optimal laser orientation in order to minimize the possibility of excessive laser-induced tissue ablation. We first develop a 3D data-driven geometric model to predict the shape of the tissue cavity after a single laser ablation. Modelling the "target" and "non-target" tissue region by an obstacle boundary, the determination of an optimal orientation is converted to a collision-minimization problem. The goal of this optimization formulation is maintaining the ablated contour distance from the obstacle boundary, which is solved by Projected gradient descent. Simulation experiments were conducted and the results validated the proposed method with conditions of various obstacle shapes and different initial incident angles. Copyright © 2022, The Authors. All rights reserved.

关键词： Gradient methods

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Stoner instabilities and Ising excitonic states in twisted transition metal dichalcogenides

arXiv

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arXiv 2024年

作者： Ghiotto, Augusto Wei, LingNan Song, Larry Zang, Jiawei Tazi, Aya Batoul Ostrom, Daniel Watanabe, Kenji Taniguchi, Takashi Hone, James C. Rhodes, Daniel A. Millis, Andrew J. Dean, Cory R. Wang, Lei Pasupathy, Abhay N. Department of Physics Columbia University New York United States National Laboratory of Solid-State Microstructures School of Physics Nanjing University Nanjing China National Institute for Materials Science Tsukuba Japan Department of Mechanical Engineering Columbia University New York United States Department of Materials Science and Engineering University of Wisconsin Madison United States Center for Computational Quantum Physics Flatiron Institute New York United States Condensed Matter Physics and Materials Science Division Brookhaven National Laboratory Upton United States

Moiré transition metal dichalcogenide (TMD) systems provide a tunable platform for studying electron-correlation driven quantum phases (1). Such phases have so far been found at rational fillings of the moiré superlattice, and it is believed that lattice commensurability plays a key role in their stability. In this work, we show via magnetotransport measurements on twisted WSe2 that new correlated electronic phases can exist away from commensurability. The first phase is an antiferromagnetic metal that is driven by proximity to the van Hove singularity. The second is a re-entrant magnetic field-driven insulator. This insulator is formed from a small and equal density of electrons and holes with opposite spin projections – an Ising excitonic insulator. © 2024, CC BY.

关键词： Transition metals

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