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Understanding the oxidation chemistry of Ti_(3)C_(2)T_(x)(MXene)sheets and their catalytic performances

Journal of Energy Chemistry 2024年第1期88卷 437-445,I0010页

作者： Suvdanchimeg Sunderiya Selengesuren Suragtkhuu Solongo Purevdorj Tumentsereg Ochirkhuyag Munkhjargal Bat-Erdene Purevlkham Myagmarsereejid Ashley DSlattery Abdulaziz SRBati Joseph GShapter Dorj Odkhuu Sarangerel Davaasambuu Munkhbayar Batmunkh Department of Chemistry Division of Natural SciencesSchool of Arts and SciencesNational University of MongoliaUlaanbaatar 14200Mongolia Queensland Micro-and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathan campusBrisbaneQueensland 4111Australia Department of Physics Incheon National UniversityIncheon 22012Republic of Korea Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaBrisbaneQueensland 4072Australia adelaide microscopy The University of AdelaideAdelaideSouth Australia 5005Australia Centre for Organic Photonics&Electronics School of Chemistry and Molecular BiosciencesThe University of QueenslandSt LuciaBrisbaneQueensland 4072Australia

Transition metal carbides and nitrides(MXenes)nanosheets are attractive two-dimensional(2D)materials,but they suffer from oxidation/degradation issues during storage and/or applications due to their sensitivity to water and oxygen.Despite the great research progress,the exact oxidation kinetics of Ti_(3)C_(2)T_(x)(MXene)and their final products after oxidation are not fully understood.Herein,we systematically tracked the oxidation process of few-layer Ti_(3)C_(2)T_(x) nanosheets in an aqueous solution at room temperature over several weeks.We also studied the oxidation effects on the electrocatalytic properties of Ti_(3)C_(2)T_(x) for hydrogen evolution reaction and found that the overpotential to achieve a current density of 10 mA cm^(-2)increases from 0.435 to 0.877 V after three weeks of degradation,followed by improvement to stabilized values of around 0.40 V after eight weeks.These results suggest that severely oxidized MXene could be a promising candidate for designing efficient catalysts.According to our detailed experimental characterization and theoretical calculations,unlike previous studies,black titanium oxide is formed as the final product in addition to white Ti(IV)oxide and disordered carbons after the complete oxidation of Ti_(3)C_(2)T_(x).This work presents significant advancements in better understanding of 2D Ti_(3)C_(2)T_(x)(MXene)oxidation and enhances the prospects of this material for various applications.

关键词： 2D materials MXene Chemical degradation Catalysis Hydrogen evolution reaction

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Efficient and selective recovery of Gd(Ⅲ)via polyethyleneimine modification of lanthanum-based metal-organic frameworks

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Journal of Rare Earths 2024年第1期42卷 210-219,I0007页

作者： Wenhao Li Lijinhong Huang Bin Xiao Xiaoguang Duan Haike Li Lang Li Wanfu Huang Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and TechnologyGanzhou341000China Innovation Center for Water Quality Security Technology at Ganjiang River Basin Jiangxi University of Science and TechnologyGanzhou341000China Faculty of Science and Engineering WA School of Mines:MineralsEnergy and Chemical EngineeringCurtin UniversityWAAustralia School of Architecture and Design Jiangxi University of Science and TechnologyGanzhou341000China School of Resources and Architectural Engineering Gannan University of Science and TechnologyGanzhou341000China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou341000China

With the development of the economy and the increasing demand for environmental protection,the efficient and selective recovery of Gd(Ⅲ)from actual wastewater is of critical importance.In this work,lanthanum-based metal-organic framework(LaBDC)materials were prepared by a hydrothermal method,and then polyethyleneimine(PEI)and LaBDC were combined by an impregnation method to form a novel LaBDC@xPEI composite.The prepared materials were characterized using Fourier transfo rm infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),B runauer-Emmett-Teller(BET),thermogravimetric analysis(TGA)and X-ray photoelectron spectroscopy(XPS).Experiments show that LaBDC@50%PEI has the highest adsorption capacity(181.77 mg/g)among lanthanum-based MOFs with different PEI loadings at pH=5.5,which is about 5.1 times that of bare LaBDC.The adsorption isotherm analysis shows that LaBDC@50%PEI follows the Langmuir model.In addition,the adsorption kinetics of LaBDC@50%PEI follows a pseudo-second-order kinetic model,indicating that the adsorption process is chemical adsorption.It is worth noting that LaBDC@50%PEI maintains good adsorption performance and stability after three recycling tests,and exhibits excellent selectivity in cation interference experiments.Overall,the LaBDC@50%PEI composites possess good stability and hold great promises in rapid recovery of Gd(Ⅲ)from practical aqueous environments.

关键词： Wet-impregnation method Polyethylene imine Metaleorganic frameworks Lanthanum Recovery of Gd(Ⅲ) Rare earths

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Experimentally unsupervised deconvolution for light-sheet microscopy with propagation-invariant beams

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Light(Science & Applications) 2022年第11期11卷 2790-2804页

作者： Philip Wijesinghe Stella Corsetti Darren J.X.Chow Shuzo Sakata Kylie R.Dunning Kishan Dholakia SUPA School of Physics and AstronomyUniversity of St AndrewsNorth HaughSt AndrewsFife KY169SSUK Robinson Research Institute Adelaide Medical SchoolThe University of AdelaideAdelaideSAAustralia Australian Research Council Centre of Excellence for Nanoscale BioPhotonics The University of AdelaideAdelaideSAAustralia Institute for Photonics and Advanced Sensing The University of AdelaideAdelaideSAAustralia Strathclyde Institute of Pharmacy and Biomedical Sciences University of StrathclydeGlasgow G4 OREUK School of Biological Sciences The University of AdelaideAdelaideSAAustralia Department of Physics College of ScienceYonsei UniversitySeoul 03722South Korea

Deconvolution is a challenging inverse problem,particularly in techniques that employ complex engineered pointspread functions,such as microscopy with propagation-invariant beams.Here,we present a deep-learning method for deconvolution that,in lieu of end-to-end training with ground truths,is trained using known physics of the imaging system.Specifically,we train a generative adversarial network with images generated with the known point-spread function of the system,and combine this with unpaired experimental data that preserve perceptual content.Our method rapidly and robustly deconvolves and super-resolves microscopy images,demonstrating a two-fold improvement in image contrast to conventional deconvolution methods.In contrast to common end-to-end networks that often require 1000-10,000s paired images,our method is experimentally unsupervised and can be trained solely on a few hundred regions of interest.We demonstrate its performance on light-sheet microscopy with propagation-invariant Airy beams in oocytes,preimplantation embryos and excised brain tissue,as well as illustrate its utility for Bessel-beam LSM.This method aims to democratise learned methods for deconvolution,as it does not require data acquisition outwith the conventional imaging protocol.

关键词： invariant propagation implantation

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In situ Lu–Hf phosphate geochronology:Progress towards a new tool for space exploration

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Geoscience Frontiers 2022年第3期13卷 164-167页

作者： Stijn Glorie Thomas Burke Martin Hand Alexander Simpson Sarah Gilbert Benjamin Wade Department of Earth Sciences The University of AdelaideSA 5005 AdelaideAustralia Adelade microscopy The University of AdelaideSA 5005 AdelaideAustralia

Geochronology is fundamental to understanding planetary evolution.However,as space exploration continues to expand,traditional dating methods,involving complex laboratory processes,are generally not realistic for unmanned space applications.Campaign-style planetary exploration missions require dating methods that can(1)rapidly resolve age information on small samples,(2)be applied to minerals common in mafic rocks,and(3)be based on technologies that could be installed on future rover systems.We demonstrate the application of rapid in situ microanalytical Lu–Hf phosphate geochronology using samples of pallasite meteorites,which are representative examples of the deep interiors of differentiated planetoids that are generally difficult to date.Individual pallasites were dated by laser ablation tandem mass-spectrometry(LA-ICP-MS/MS),demonstrating a rapid novel method for exploring planetary evolution.Derived formation ages for individual pallasites agree with traditional methods and have<2%uncertainty,opening an avenue of opportunity for remote micro-analytical space exploration.

关键词： Pallasite meteorites Lu-Hf geochronology Laser ablation tandem mass-spectrometry Micro-analytical planetary exploration

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Laser ablation(in situ)Lu-Hf dating of magmatic fluorite and hydrothermal fluorite-bearing veins

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Geoscience Frontiers 2023年第6期14卷 142-154页

作者： Stijn Glorie Jacob Mulder Martin Hand Adrian Fabris Alexander Simpson Sarah Gilbert Department of Earth Sciences University of AdelaideSA 5005Australia Geological Survey of South Australia Department for Energy and MiningAdelaideSA 5005Australia adelaide microscopy University of AdelaideSA 5005Australia

Fluorite(CaF_(2))is a common hydrothermal mineral,which precipitates from fluorine-rich fluids with an exceptional capacity to transport metals and Rare Earth Elements(REEs).Hence,the ability to date fluorite has important implications for understanding the timing of metal transport in hydrothermal systems.Here we present,for the first time,fluorite Lu-Hf dates from fluorite-carbonate veins from the Olympic Cu-Au Province in South Australia.The fluorite dates were obtained in situ using the recently developed LA-ICP-MS/MS Lu-Hf dating method.A fluorite-calcite age of 1588±19 Ma was obtained for the Torrens Dam prospect,consistent with the timing of the formation of the nearby Olympic Dam iron-oxide copper gold Breccia Complex.Veins in the overlying Neoproterozoic successions were dated at 502±14 Ma,indicating a temporal link between Cu-sulphide remobilisation and the Delamerian Orogeny.Additionally,we present a multi-session reproducible date for magmatic fluorite from a monzogranite in the Pilbara Craton(Lu-Hf age of 2866±19 Ma).This age is consistent with a garnet Lu-Hf age from the same sample(2850±12 Ma)and holds potential to be developed into a secondary reference material for future fluorite Lu-Hf dating.

关键词： Reaction-cell ICP-MS In-situ geochronology Fluorite-calcite veins Iron oxide copper-gold Critical mineral exploration Rare Earth Elements

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In the shadow of the laser phantom needle cross:dynamic air-plasma aperture sheds light on terahertz microscopy

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Light(Science & Applications) 2022年第6期11卷 1032-1033页

作者： Daniel Headland Withawat Withayachumnankul Optoelectronics and Laser Technology Group Department of Electronics TechnologyUniversidad CarlosⅢde Madrid28911 MadridSpain Terahertz Engineering Laboratory School of Electrical and Electronic EngineeringThe University of AdelaideAdelaideSA 5005Australia

Two plasma filaments crossing above the target create a subwavelength window for terahertz microscopy that excludes any subwavelength probe in vicinity.

关键词： laser needle dynamic

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6061铝合金的电火花加工（英文）

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 2866-2874页

作者： A.PRAMANIK A.K.BASAK M.N.ISLAM G.LITTLEFAIR Department of Mechanical Engineering Curtin University adelaide microscopy the University of Adelaide School of Engineering Deakin University

在不同脉冲时间和导线张力下,研究6061铝合金电火花线切割加工过程中材料的去除率、切口/狭缝宽度、表面光洁度和线电极磨损,通过改变脉冲时间和导线张力,在电火花线切割加工机床上进行了8次实验。结果表明,随着脉冲时间的延长,材料的... 详细信息

在不同脉冲时间和导线张力下,研究6061铝合金电火花线切割加工过程中材料的去除率、切口/狭缝宽度、表面光洁度和线电极磨损,通过改变脉冲时间和导线张力,在电火花线切割加工机床上进行了8次实验。结果表明,随着脉冲时间的延长,材料的去除率增加,但导线张力不影响材料的去除率。较高的导线张力有利于促进加工工艺的稳定性,产生较低的线电极磨损和更好的表面光洁度。随着脉冲时间的变化,表面粗糙度没有明显变化。在所有加工条件下,表面外观非常相似。加工后表面包含凝固熔融材料、飞溅材料和气泡。由于热量输入的增加,脉冲时间的延长增大了线电极的磨损。线电极的磨损产生了斜槽,该斜槽正面的切口宽度比底部的宽。较高的电极损耗会产生较高的锥度。

关键词：电火花线切割 6061铝合金材料去除率切口宽度表面光洁度

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Comparative study between wear of uncoated and TiAIN-coated carbide tools in milling of Ti6AI4V

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Advances in Manufacturing 2017年第1期5卷 83-91页

作者： M. S. Uddin Binh Pham Ahmed Sarhan Animesh Basak Alokesh Pramanik School of Engineering University of South AustraliaMawson Lakes SA 5095 Australia Department of Mechanical Engineering University ofMalaya Kuala Lumpur Malaysia adelaide microscopy Unit University of Adelaide AdelaideSA 5005 Australia Department of Mechanical Engineering Curtin University ofTechnology Bently WA 6845 Australia

As is recognized widely, tool wear is a major problem in the machining of difficult-to-cut titanium alloys. Therefore, it is of significant interest and importance to understand and determine quantitatively and qualitatively tool wear evolution and the underlying wear mechanisms. The main aim of this paper is to investigate and analyse wear, wear mechanisms and surface and chip generation of uncoated and TiAlN-coated carbide tools in a dry milling of Ti6Al4V alloys. The quantitative flank wear and roughness were measured and recorded. Optical and scanning electron microscopy （SEM） observations of the tool cutting edge, machined surface and chips were conducted. The results show that the TiAlN-coated tool exhi- bits an approximately 44% longer tool life than the uncoated tool at a cutting distance of 16 m. A more regular progressive abrasion between the flank face of the tool and the workpiece is found to be the underlying wear mechanism. The TiAlN-coated tool generates a smooth machined surface with 31% lower roughness than the uncoated tool. As is expected, both tools generate serrated chips. However, the burnt chips with blue color are noticed for the uncoated tool as the cutting continues further. The results are shown to be consistent with observation of other researchers, and further imply that coated tools with appropriate combinations of cutting parameters would be able to increase the tool life in cutting of titanium alloys.

关键词： Tool wear Titanium alloy Tungsten carbidetool Wear mechanism High speed machining

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Deformation correlations,stress field switches and evolution of an orogenic intersection:The Pan-African Kaoko-Damara orogenic junction,Namibia

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Geoscience Frontiers 2017年第6期8卷 1187-1232页

作者： Ben Goscombe David A.Foster David Gray Ben Wade Antonios Marsellos Jason Titus Integrated Terrane Analysis Research(ITAR) 18 Cambridge RdAldgate5154SAAustralia Department of Geological Sciences University of FloridaGainesvilleFL32611USA School of Earth Sciences University of TasmaniaHobartTASAustralia adelaide microscopy University of AdelaideAdelaide5005SAAustralia Hofstra University HempsteadNYUSA

Age calibrated deformation histories established by detailed mapping and dating of key magmatic time markers are correlated across all tectono-metamorphic provinces in the Damara Orogenic System.Correlations across structural belts result in an internally consistent deformation framework with evidence of stress field rotations with similar timing,and switches between different deformation events.Horizontal principle compressive stress rotated clockwise ~180°in total during Kaoko Belt evolution,and^135° during Damara Belt evolution.At most stages,stress field variation is progressive and can be attributed to events within the Damara Orogenic System,caused by changes in relative trajectories of the interacting Rio De La Plata,Congo,and Kalahari Cratons.Kaokoan orogenesis occurred earliest and evolved from collision and obduction at ~590 Ma,involving E-W directed shortening,progressing through different transpressional states with ~45° rotation of the stress field to strike-slip shear under NW-SE shortening at ~550-530 Ma.Damaran orogenesis evolved from collision at ~555-550 Ma with NW-SE directed shortening in common with the Kaoko Belt,and subsequently evolved through ~90°rotation of the stress field to NE-SW shortening at ~512-508 Ma.Both Kaoko and Damara orogenic fronts were operating at the same time,with all three cratons being coaxially convergent during the 550-530 Ma period;Rio De La Plata directed SE against the Congo Craton margin,and both together over-riding the Kalahari Craton margin also towards the SE.Progressive stress field rotation was punctuated by rapid and significant switches at ~530-525 Ma,~508 Ma and ~505 Ma.These three events included:(1)Culmination of main phase orogenesis in the Damara Belt,coinciding with maximum burial and peak metamorphism at 530-525 Ma.This occurred at the same time as termination of transpression and initiation of transtensional reactivation of shear zones in the Kaoko Belt.Principle compressive stress switched from NW-SE to NNW-SSE shortening in both Kaoko and Damar

关键词： Damara Orogen Stress fields Orogeny Assembly of Gondwana Event geochronology Deformation correlations

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Fatigue life of machined components

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Advances in Manufacturing 2017年第1期5卷 59-76页

作者： A. Pramanik A. R. Dixit S. Chattopadhyaya M. S. Uddin Yu Dong A. K. Basak G. Littlefair Department of Mechanical Engineering Curtin UniversityBentley WA 6102 Australia Department of Mechanical Engineering Indian School ofMines Dhanbad 826004 India School of Engineering University of South AustraliaMawson Lakes SA 5095 Australia adelaide microscopy The University of Adelaide AdelaideSA Australia School of Engineering Deakin University Waurn PondsVIC Australia

A correlation between machining process and fatigue strength of machined components clearly exists. However, a complete picture of the knowledge on this is not readily available for practical applications. This study addresses this issue by investigating the effects of machining methods on fatigue life of commonly used materials, such as titanium alloys, steel, aluminium alloys and nickel alloys from previous literature. Effects of turning, milling, grinding and different non-conventional machining processes on fatigue strength of above-mentioned materials have been investigated in detail with correlated information. It is found that the effect of materials is not significant except steel in which phase change causes volume expansion, resulting in compressive/tensile residual stresses based on the amounts of white layers. It is very complex to identify the influence of surface roughness on the fatigue strength of machined components in the presence of residual stresses. The polishing process improves the surface roughness, but removes the surface layers that contain compressive residual stresses to decrease the fatigue strength of polished specimens. The compressive and tensile residual stresses improve and reduce fatigue strength, respectively. Grinding process induces tensile residual stresses on the machined surfaces due to high temperature generation. On the other hand, milling and turning processes induce compressive residual stresses. High temperature non-conventional machining generates a network of microcracks on the surfaces in addition to tensile residual stresses to subsequently reduce fatigue strength of machined components. Embedded grits of abrasive water jet machining degrade the fatigue performance of components machined by this method.

关键词： Traditional machining Non-traditionalmachining Fatigue strength Surface roughness Residualstress Phase change

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