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Recent catalytic applications of MXene-based layered nanomaterials

Chemosphere 2023年 325卷 138323页

作者： Xia, Changlei Ye, Haoran Kim, Aejung Sabahi Namini, Abbas Li, Suiyi Delbari, Seyed Ali Park, Joo Young Kim, Dokyoon Le, Quyet Van Varma, Rajender S. Luque, Rafael T-Raissi, Ali Jang, Ho Won Shokouhimehr, Mohammadreza Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Materials Science and Engineering Nanjing Forestry University Jiangsu Nanjing210037 China Hankuk University of Foreign Studies Seoul02449 Korea Republic of Department of Engineering Sciences Faculty of Advanced Technologies University of Mohaghegh Ardabili Ardabil Iran Department of Nano-bio Convergence Korea Institute of Materials Science Changwon51508 Korea Republic of Department of Bionano Engineering Hanyang University Ansan15588 Korea Republic of Department of Materials Science and Engineering Institute of Green Manufacturing Technology Korea University 145 Anam-ro Seongbuk-gu Seoul02841 Korea Republic of Studentská 1402/2 Liberec 1 461 17 Czech Republic 6 Miklukho Maklaya str. Moscow117198 Russia Universidad ECOTEC Km. 13.5 Samborondón SamborondónEC092302 Ecuador University of Central Florida Florida Solar Energy Center CocoaFL32922 United States Institute of Nanosensor Technology Hanyang University Ansan15588 Korea Republic of Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul08826 Korea Republic of

The urgent issues related to the catalytic processes and energy applications have accelerated the development of hybrid and smart materials. MXenes are a new family of atomic layered nanostructured materials that require considerable research. Tailorable morphologies, strong electrical conductivity, great chemical stability, large surface-to-volume ratios, tunable structures, among others are some significant characteristics that make MXenes appropriate for various electrochemical reactions, including dry reforming of methane, hydrogen evolution reaction, methanol oxidation reaction, sulfur reduction reaction, Suzuki–Miyaura coupling reaction, water−gas shift reaction, and so forth. MXenes, on the other hand, have a fundamental drawback of agglomeration, as well as poor long-term recyclability and stability. One possibility for overcoming the restrictions is the fusion of nanosheets or nanoparticles with MXenes. Herein, the relevant literature on the synthesis, catalytic stability and reusability, and applications of several MXene-based nanocatalysts are deliberated including the merits and cons of the newer MXene-based catalysts. © 2023 Elsevier Ltd

关键词： Chemical bonds

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Opto-thermoelectric microswimmers

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Light(science & Applications) 2020年第1期9卷 674-685页

作者： Xiaolei Peng Zhihan Chen Pavana Siddhartha Kollipara Yaoran Liu Jie Fang Linhan Lin Yuebing Zheng Materials Science&Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX 78712USA Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084People’s Republic of China

Inspired by the“run-and-tumble”behaviours of Escherichia coli(***)cells,we develop opto-thermoelectric *** microswimmers are based on dielectric-Au Janus particles driven by a self-sustained electrical field that arises from the asymmetric optothermal response of the *** illumination by a defocused laser beam,the Janus particles exhibit an optically generated temperature gradient along the particle surfaces,leading to an opto-thermoelectrical field that propels the *** further discover that the swimming direction is determined by the particle *** enable navigation of the swimmers,we propose a new optomechanical approach to drive the in-plane rotation of Janus particles under a temperature-gradient-induced electrical field using a focused laser *** the rotation laser beam allows us to position the particles at any desired orientation and thus to actively control the swimming direction with high *** incorporating dark-field optical imaging and a feedback control algorithm,we achieve automated propelling and navigation of the *** optothermoelectric microswimmers could find applications in the study of opto-thermoelectrical coupling in dynamic colloidal systems,active matter,biomedical sensing,and targeted drug delivery.

关键词： rotation illumination beam

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Morphology Control of Nanoporous Gold Crystals Through Selective Dissolution of Au-Ge Eutectic Microstructures

SSRN

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SSRN 2024年

作者： Portal, Lotan Polishchuk, Iryna Koifman-Khristosov, Maria Katsman, Alexander Pokroy, Boaz Department of Materials Science and Engineering Technion – Israel Institute of Technology Haifa32000 Israel Russell Berrie Nanotechnology Institute Technion – Israel Institute of Technology Haifa32000 Israel The Nancy and Stephen Grand Technion Energy Program Technion − Israel Institute of Technology Haifa3200003 Israel

The synthesis of nanoporous gold (np-Au) through the conventional method of dealloying a more reactive element from Au alloys has been extensively studied and applied in various fields, particularly catalysis. In this study, we explore a novel approach to creating droplet-like np-Au crystals through the selective dissolution of Au-Ge eutectic *** work reveals that adjusting the undercooling of the eutectic melt during solidification allows for the tuning of pore and ligament sizes. We demonstrate that this undercooling can be modified, either directly or indirectly, by adjusting the cooling rate or the heterogeneous nucleation site density of the eutectic melt. Our findings, aligned with the Zener-Turnbull theoretical model for eutectic solidification, elucidate the connection between the tuning of pore and ligament sizes in the eutectic microstructure and the undercooling of the eutectic ***, we establish that this phenomenon is applicable to a variety of compositions, whether hypereutectic, eutectic, or hypoeutectic. The ability to regulate pore and ligament sizes enhances the catalytic activity of np-Au. We demonstrate that crystals with average pores of 45 nm exhibit approximately twice the catalytic activity compared to np-Au crystals with pores twice as large. © 2024, The Authors. All rights reserved.

关键词： Catalysis

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Grain Boundary Segregation Transitions and Critical Phenomena in Binary Regular Solutions: A Systematics of Complexion Diagrams with Universal Characters

arXiv

引用

arXiv 2021年

作者： Zhou, Naixie Hu, Chongze Luo, Jian Department of NanoEngineering Program of Materials Science and Engineering University of California San Diego United States

A systematics of grain boundary (GB) segregation transitions and critical phenomena has been derived to expand the classical GB segregation theory. Using twist GBs as an example, this study uncovers when GB layering vs. prewetting transitions should occur and how they are related to one another. Moreover, a novel descriptor, normalized segregation strength (seg), is introduced. It can represent several factors that control GB segregation, including strain and bond energies, as well as misorientation for small-angle GBs (in a mean-field approximation), which had to be treated separately in prior models. In a strong segregation system with a large seg, first-order layering transitions occur at low temperatures and become continuous above GB roughing temperatures. With reducing seg, the layering transitions gradually merge and finally lump into prewetting transitions without quantized layer numbers, akin to Cahn’s critical-point wetting model. Furthermore, GB complexion diagrams with universal characters are constructed as the GB counterpart to the classical exemplar of Pelton-Thompson regular-solution binary bulk phase diagrams. © 2021, CC BY.

关键词： Grain boundaries

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Systematic assessment of dredged sludge dewaterability improvement with different organic polymers based on analytic hierarchy process

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Journal of Environmental sciences 2021年第5期33卷 311-321页

作者： Zhenzhen Song Hongyu Gao Wanwan Liu Liqing Li Weijun Zhang Dongsheng Wang Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074HubeiChina State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Institute for resources and environmental engineering Shanxi UniversityTaiyuan 030006ShanxiChina School of Environmental Studies China University of GeosciencesWuhan 430074HubeiChina

Organic polymeric flocculants are commonly used in improving dredged sludge dewaterability, but less attention has been paid to residual water quality. In this paper, the effects of cationic etherified starch(CS) and poly-dimethyl diallyl ammonium chloride(PDDA) on dredged sludge dewatering efficiency and residual water quality of Baiyangdian lake were comprehensively investigated and evaluated by analytic hierarchy process(AHP). The results indicated that PDDA had stronger electrical effect and flocculation performance compared with CS, resulting in more efficient dewatering performance. PDDA can reduce the pollutants of discharged residual water, while CS significantly promoted the increase of NH_(4)^(+)-N and NO_(3)^(–)-N in the residual water. The increase of NH_(4)^(+)-N in the residual water of CS was due to the release of dredged sludge, while the increase of NO_(3)^(-)-N was introduced by CS leaching. AHP showed that PDDA performed better in flocculation treatment of dredged sludge than other organic polymers. This work provides a method for optimization of flocculation treatment for dredged sludge dewaterability.

关键词： Dredge sludge dewatering Flocculation evaluation model Residual water quality Analytic hierarchy process

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Influence of Microstructure and Phase Morphology on the Stability of High Temperature Irradiation Resistant Thermocouples

SSRN

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SSRN 2023年

作者： Riley, Scott Holloway, Kyle Bateman, Allyssa Skifton, Richard Jaques, Brian Boise State University Micron School of Materials Science and Engineering BoiseID United States Center for Advanced Energy Studies Idaho FallsID United States Idaho National Laboratory Idaho FallsID United States

Development of in-core instrumentation is driven by the pursuit of safer and more economic energy production from both existing nuclear reactors and Generation IV reactor designs. Idaho National Laboratory (INL) has developed high temperature irradiation resistant thermocouples (HTIR-TCs) for temperature sensing inside Generation IV nuclear reactors. These thermocouples are composed of phosphorus-doped niobium (Nb-P) and lanthana-doped molybdenum (Mo-LaO) thermoelements, an alumina (Al2O3) insulation, and a niobium sheath. HTIR-TCs require an initial heat treatment exceeding the maximum service temperature to stabilize the generated electromotive force (EMF) signal;however, the mechanism behind this stabilization is not well understood. This work evaluates the impact of the stabilization heat treatment on the thermoelements' microstructures, chemical stability, and electrical properties to determine the mechanisms by which the EMF signal stabilization occurs. Accordingly, during the preliminary heat treatment, a secondary Nb3P phase formed within the Nb-P, along with an interaction region at the Al2O3/niobium interface. The formation of secondary phases within the niobium leg of the thermocouple causes an increase in the Seebeck coefficient. Stabilization of the HTIR-TC EMF signal was found to be dependent upon both the equilibrium of a diffusion interaction region at the Nb-P/Al2O3 interface and the formation of Nb3P precipitates. © 2023, The Authors. All rights reserved.

关键词： Thermocouples

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Study of structure-property relationship of semiconductor nanomaterials by off-axis electron holography

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Journal of Semiconductors 2022年第4期43卷 36-45页

作者： Luying Li Yongfa Cheng Zunyu Liu Shuwen Yan Li Li Jianbo Wang Lei Zhang Yihua Gao Center for Nanoscale Characterization&Devices Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-Structuresand the Institute for Advanced StudiesWuhan UniversityWuhan 430072China Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Collaborative Innovation Center for Advanced Organic Chemical MaterialsSchool of Materials Science and EngineeringHubei UniversityWuhan 430062China

As the scaling down of semiconductor devices, it would be necessary to discover the structure-property relationship of semiconductor nanomaterials at nanometer scale. In this review, the quantitative characterization technique off-axis electron holography is introduced in details, followed by its applications in various semiconductor nanomaterials including group IV, compound and two-dimensional semiconductor nanostructures in static states as well as under various stimuli. The advantages and disadvantages of off-axis electron holography in material analysis are discussed, the challenges facing in-situ electron holographic study of semiconductor devices at working conditions are presented, and all the possible influencing factors need to be considered to achieve the final goal of fulfilling quantitative characterization of the structure-property relationship of semiconductor devices at their working conditions.

关键词： semiconductor nanostructure structure-property relationship off-axis electron holography electrostatic potential charge distribution

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Terahertz Time-Domain Imaging for Radiotherapy Treatment Monitoring in Pancreatic Ductal Adenocarcinoma

Terahertz Time-Domain Imaging for Radiotherapy Treatment Mon...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Debamitra Chakraborty Bradley N. Mills Jing Cheng Ivan Komissarov Scott Gerber Roman Sobolewski Materials Science Graduate Program University of Rochester Rochester New York Laboratory for Laser Energetics University of Rochester Rochester New York Department of Surgery University of Rochester Medical Center Rochester New York Department of Electrical and Computer Engineering University of Rochester Rochester New York

ISBN: (纸本)9798350369311

Terahertz time-domain imaging was performed of stereotactic body radiotherapy-treated murine pancreatic ductal adenocarcinoma (PDAC) with a high spatial resolution. To generate 2D maps of the tissue samples, the refractive index and absorption coefficient were used as imaging markers extracted with the maximum a-posteriori probability (MAP) estimation algorithm. The results were then compared with the terahertz maps of untreated murine PDAC tissue samples and demonstrated that terahertz imaging can probe physical changes with high sensitivity in the tissue post treatment.

关键词： Maximum a posteriori estimation Terahertz wave imaging Laser theory Sensitivity Refractive index Radiation therapy Time-domain analysis Spatial resolution Probes Monitoring

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Stepwise construction of Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and magnetic separability for efficient visible-light photocatalysis

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Chinese Chemical Letters 2020年第6期31卷 1598-1602页

作者： Zhijian Li Yao Wang Ahmed A.Elzatahry Xuanyu Yang Shouzhi Pu Wei Luo Xiaowei Cheng Yonghui Deng Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan University.Shanghai 200433China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China Materials Science and Technology Program College of Arts and SciencesQatar UniversityDoha PO Box 2713Qatar State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Solid photocatalysts with high specific surface area,superior photoactivity and ease of recycling are highly desired in chemical process,water treatment and so *** this study,a facile stepwise sol-gel coating approach was utilized to synthesize Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and convenient magnetic separability(denoted as Fe3 O4@-SiO2@Pt/mTiO2-x).These photocatalysts consist of magnetic Fe3 O4 cores,nonporous insulating SiO2 middle layer and mesoporous anatase TiO2-x shell decorated by Pt nanoparticles(~3.5 nm)through wet impregnation and H2 *** a result of high activity of oxygen-deficiency of black TiO2-x by H2 reduction and efficient inhibition of electron-hole recombination by Pt nanoparticles,the rationally designed core-shell Fe3 O4@SiO2@Pt/mTiO2-x photocatalysts exhibit superior photocatalytic performance in rhodamine B(RhB)degradation under visible light irradiation,with more than 98%of RhB degraded within 50 *** core-shell structured photocatalysts show excellent recyclability under the assistance of magnetic separation with well-retained photocatalytic performance even after running five *** stepwise synthesis method paves the way for the rational design of a high-efficiency recyclable heterogeneous catalyst,including photocatalysts,for various applications.

关键词： Core-shell Mesoporous TiO2 Photocatalytic activity Magnetic recovery Visible light

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Performance comparison of InGaN-based 40–80 μm micro-LEDs fabricated with and without plasma etching

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materials Today Advances 2024年 22卷

作者： Lo, Yu-Yun Chen, Yi-Ho Hsu, Yun-Cheng Lee, Tzu-Yi Hung, Yu-Ying Kao, Yu-Cheng Zan, Hsiao-Wen Wuu, Dong- Sing Kuo, Hao-Chung Samukawa, Seiji Horng, Ray-Hua Institute of Electronics National Yang Ming Chiao Tung University 1001 University Road Hsinchu30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Graduate Degree Program of College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Materials Science and Engineering National Chung Hsing University Taichung40227 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan Institute of Communications Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan

The fabrication of InGaN-based blue 4✕4 array micro-LEDs (μLEDs) with 40 μm ✕40 μm chip size and 2✕2 array μLEDs with 80 μm ✕80 μm chip size etching by the inductive coupled plasma reactive ion etching (ICPRIE) and defect-free neutral beam etching (NBE) processes was studied in this work. In μLEDs of this size, the influence of defects formation in the sidewalls on EQE was evaluated. There was almost no difference in EQE between μLEDs array etched by the NBE process no matter 40 μm ✕40 μm and 80 μm ✕80 μm, but the dependence was observed in the ICPRIE. Even with this size, it was found that the size effect of EQE is smaller than that in case of using ICPRIE for defect-free neutral beam etching. This impact is substantial since μLED predominantly operated at low current density, around 1–5 A/cm2. Consequently, the reduction of defect density, encompassing both internal and sidewall defects, becomes imperative even in 40–80 μm InGaN-based μLEDs. This not only improves the overall efficiency of μLEDs but also fortifies the brightness stability of μLED displays if process etching by NBE. It was also found that the etching shape had an influence on EQE. It could be attributed to fact that the etching profile angle of NBE was more vertical than that of ICPRIE. Because the different angles of the mesa resulted in different light intensity. The μLEDs emitting with a wavelength of 450 nm, the light extraction efficiency and intensity at a mesa angle 58° of NBE etching μLEDs was about 8% lower than those of an angle (38°) of ICPRIE etching μLEDs by simulation. © The Authors

关键词： Light emitting diodes

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