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Dual-compressed photoacoustic single-pixel imaging

National science Review 2023年第1期10卷 187-195页

作者： Yuning Guo Baowen Li Xiaobo Yin Department of Mechanical Engineering University of Colorado Department of Material Science and Engineering Department of Physics Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Materials Science and Engineering Program University of Colorado

Photoacoustic imaging,an acoustic imaging modality with potentially optical resolution in an optical turbid medium,has attracted great ***,the convergence of wavefront optimization and raster scanning in computational photoacoustic imaging leads to the challenge of fast mapping,especially for a spatial resolution approaching the acoustic deep-subwavelength *** a sparse sampling paradigm,compressive sensing has been applied in numerous fields to accelerate data acquisition without significant quality *** this work,we propose a dual-compressed approach for photoacoustic surface tomography that enables high-efficiency imaging with 3D spatial resolution unlimited by the acoustics in a turbid *** dual-compressed photoacoustic imaging with single-pixel detection,enabled by spatially optical modulation with synchronized temporally photoacoustic coding,allows decoding of the fine optical information from the modulated acoustic signal even when the variance of original photoacoustic signals is *** perform a proof-of-principle numerical demonstration of dual-compressed photoacoustic imaging, that resolves acoustic sub-acoustic-wavelength details with a significantly reduced number of measurements,revealing the potential for dynamic *** dual-compressed concept,which transforms unobtrusive spatial difference into spatio-temporal detectable information,can be generalized to other imaging modalities to re alize efficient,high-spatial-resolution imaging.

关键词： photoacoustic imaging compressive sensing single-pixel imaging surface tomography

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Texture development and surface reconstruction of BiVO_(4)photoanode via one-pot hydrothermal reaction for enhanced photoelectrochemical water splitting

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Journal of Advanced Ceramics 2025年第3期14卷 133-141页

作者： Sung Won Hwang Yoo Jae Jeong Runfa Tan Indhujasri Saravanan Hyun Soo Han Dong Hoe Kim In Sun Cho Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea Department of Material Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Mechanical Engineering Stanford UniversityStanford 94305USA Department of Material Science&Engineering Korea UniversitySeoul 02841Republic of Korea Materials Science and Engineering Program University of Colorado BoulderBoulder 80303USA

The simultaneous optimization of the bulk and surface characteristics of photoelectrodes is essential to maximize their photoelectrochemical(PEC)*** report a novel one-pot hydrothermal synthesis of textured and surface-reconstructed BiVO_(4)photoanodes(ts-BVO),achieving significant improvements in PEC water *** controlling precursor molarity and ethylene glycol(EG)addition,we developed a stepwise dual reaction(SDR)mechanism,which enables simultaneous bulk texture development and surface *** optimized CoBi/ts-BVO photoanode exhibited a photocurrent density of 4.3 mA∙cm^(−2)at 1.23 V *** hydrogen electrode(RHE)with a high Faradaic efficiency of 98%under one sun *** with nontextured BiVO_(4),the charge transport efficiency increased from 8%to 70%,whereas the surface charge transfer efficiency improved from 9%to 85%.These results underscore the critical role of both bulk and surface engineering in enhancing PEC *** findings offer a streamlined approach for improving the intrinsic properties of photoanodes in solar water splitting.

关键词： BiVO_(4) hydrothermal texture surface reconstruction ethylene glycol(EG) photoelectrochemical water splitting

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Urchin-like Na-doped zinc oxide nanoneedles for low-concentration and exclusive VOC detections

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Journal of Advanced Ceramics 2024年第4期13卷 507-517页

作者： Yiwen Zhou Yifan Luo Zichen Zheng Kewei Liu Xiaoxi He Kaidi Wu Marc Debliquy Chao Zhang College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China Material Science Department University of MonsMons 7000Belgium

In the early-stage diagnosis of lung cancer,the low-concentration(<5 ppm)volatile organic compounds(VOCs)are extensively identified to be the biomarkers for breath ***,the urchin-like sodium(Na)-doped zinc oxide(ZnO)nanoneedles were synthesized through a hydrothermal strategy with the addition of different contents of citric *** Na-doped ZnO gas sensor with a 3:1 molar ratio of Na^(+)and citric acid showed outstanding sensing properties with an optimal selectivity to various VOCs(formaldehyde(HCOH),isopropanol,acetone,and ammonia)based on working temperature ***,significantly enhanced sensitivity(21.3@5 ppm)compared with pristine ZnO(~7-fold),low limit of detection(LOD)(298 ppb),robust humidity resistance,and long-term stability of formaldehyde sensing performances were obtained,which can be attributed to the formation of a higher concentration of oxygen vacancies(20.98%)and the active electron ***,the improved sensing mechanism was demonstrated by the exquisite band structure and introduction of the additional acceptor level,which resulted in the narrowed bandgap of ZnO.

关键词： zinc oxide(ZnO) heterovalent ions doping citric acid gas sensor volatile organic compound(VOC)detection lungcancer

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Friction and Wear Characteristics of Micro-Arc Oxidation Coating on Ti6Al4V Alloy-A Review

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Biosurface and Biotribology 2025年第1期11卷 100-122页

作者： Zhangyue Qin Xiaogang Zhang Yali Zhang Yong Luo Zhongmin Jin School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina School of Material Science and Engineering China University of Mining and TechnologyXuzhouChina School of Mechanical Engineering University of LeedsLeedsUK

Ti6Al4V alloy is widely used in artificial joints,artificial bones,and dental implants due to its elastic modulus similar to that of bone,good biocompatibility and non‐cytotoxicity,low density,and excellent fatigue ***,its utility is constrained by the low surface hardness and inadequate wear ***‐arc oxidation(MAO)technology emerges as a surface modification method characterised by a straightforward process and superior processing efficacy,making it particularly favoured in enhancing the wear resistance of *** paper commenced by elucidating the fundamental principles of micro‐arc ***,it examined the impacts of crucial parameters such as electrolyte type,concentration,processing voltage,current,time,and electrolyte additives on the friction and wear properties of Ti6Al4V alloy MAO coatings,proposing three mechanisms for optimising wear *** primary strategies for augmenting the microhardness and wear resistance of Ti6Al4V alloy MAO coatings involved pore reduction even sealing,lubrication enhancement,and hard compound *** this,the article synthesised the friction and wear attributes ofMAOcoatings in conjunction with diverse modification techniques,alongside a review of fretting wear characteristics of Ti6Al4V alloy MAO ***,conclusions and prospects were presented to furnish a foundation for future exploration into the wear resistance of Ti6Al4V alloy MAO coatings in scholarly endeavours.

关键词： biomaterial coating friction Surface modification Ti6Al4V wear

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Surface Deposition of Ni(OH)_(2) and Lattice Distortion Induce the Electrochromic Performance Decay of NiO Films in Alkaline Electrolyte

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Energy & Environmental materials 2024年第3期7卷 257-267页

作者： Kejun Xu Liuying Wang Chaoqun Ge Long Wang Bin Wang Zhuo Wang Chuanwei Zhang Gu Liu Xi'an Research Institute of High Technology Xi'an 710025China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Mechanical Engineering Xi'an University of Science and TechnologyXi'an 710054China

NiO,an anodic electrochromic material,has applications in energy-saving windows,intelligent displays,and military ***,its electrochromic mechanism and reasons for its performance degradation in alkaline aqueous electrolytes are complex and poorly understood,making it challenging to improve NiO thin *** studied the phases and electrochemical characteristics of NiO films in different states(initial,colored,bleached and after 8000 cycles)and identified three main reasons for performance ***,Ni(OH)_(2)is generated during electrochromic cycling and deposited on the NiO film surface,gradually yielding a NiO@Ni(OH)_(2)core-shell structure,isolating the internal NiO film from the electrolyte,and preventing ion ***,the core-shell structure causes the mode of electrical conduction to change from first-to second-order conduction,reducing the efficiency of ion transfer to the surface Ni(OH)_(2)***,Ni(OH)_(2)and NiOOH,which have similar crystal structures but different b-axis lattice parameters,are formed during electrochromic cycling,and large volume changes in the unit cell reduce the structural stability of the thin ***,we clarified the mechanism of electrochromic performance degradation of NiO films in alkaline aqueous electrolytes and provide a route to activation of NiO films,which will promote the development of electrochromic technology.

关键词： alkaline electrolyte electrochromism NiO film performance attenuation mechanism

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Harnessing the flatbandλ-Ti_(3)O_(5):A breakthrough in solar steam generation

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science China materials 2023年第11期66卷 4515-4516页

作者： Chuxin Lei Guihua Yu Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA

As global population rises,accompanied by escalating environmental pollution and climate change,numerous countries find themselves grappling with an acute scarcity of natural freshwater resources^([1]).Seawater desalination presents a compelling solution to this looming crisis,especially considering the oceans are Earth’s largest water reservoir^([2]).

关键词： reservoir Earth breakthrough

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Abnormal Twinning Behavior and Constitutive Modeling of a Fine-Grained Extruded Mg-8.0Al-0.1Mn-2.0Ca Alloy under High-Speed Impact along Various Directions

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 281-294页

作者： Fei-Yang Chen Peng-Cheng Guo Zi-Han Jiang Xiao Liu Tie-Jun Song Chao Xie College of Mechanical and Electrical Engineering Central South University of Forestry and TechnologyChangsha410004China College of Mechanical Engineering and Mechanics Ningbo UniversityNingbo315211China College of Mechanical Engineering Xiangtan UniversityXiangtan411105China College of Material Science and Engineering Hunan University of Science and TechnologyXiangtan411201China

To understand the mechanical and twinning behaviors of a fine-grained extruded Mg-8.0Al-0.1Mn-2.0Ca alloy under high-speed impact,impact tests were carried out using a split Hopkinson pressure bar,and microstructures at strains of 0.05,0.10 and 0.20 were obtained using a series of stop rings manufactured by high-strength *** stress response and twinning behavior are closely related to loading direction and applied strain *** true stress-true strain curves are s-shaped in extrusion direction(ED)and c-shaped in transverse direction(TD),showing apparent anisotropy,while the yield strength is insensitive to loading *** identical strain-rate sensitivity is demonstrated by the stress in ED and ***,de-twinning is apparent as the applied strain increases to 0.20,and it is enhanced with increasing the applied strain *** contrast,the twin density in ED samples is clearly higher than that in TD *** modifying the terms of strain hardening and strain rate hardening in the classical JC model,an optimized model is built,which can accurately predict the stress response behavior of the studied alloy under high-speed impact along ED and *** correlation coefficient(R)and average absolute relative error(AARE)are 98.63%and 0.0199 for ED,and 96.88%and 0.0202 for TD,respectively.

关键词： High-speed impact Magnesium alloy Twinning behavior Constitutive model Anisotropy

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New strategy for enhancing the strength and toughness of Ti-Al metallic-intermetallic laminated composites: Constructing multiple heterostructures using Ni foil

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Progress in Natural science:materials International 2024年第6期34卷 1173-1183页

作者： Pengfei Zhou Meini Yuan Mengye Jia Xin Pei Yang Wang Wei Yang Honglin Wang Yuhong Zhao School of Mechanical and Electrical Engineering North University of China School of Aerospace Engineering North University of China School of Environment and Safety Engineering North University of China Inner Mongolia Metal Material Research Institute School of Materials Science and Engineering North University of China

In order to simultaneously improve the strength and ductility of Ti-Al metallic-intermetallic laminated（TA-MIL）composites, novel Ti-Al-Ni ternary MIL（TAN-TMIL） composites with multiple heterostructures（HS） were fabricated by adding a 0.02 mm Ni foil behind the Ti and Al foils. The results showed that TAN-600 consisted of the same phases（Ti, Al3Ti, and Al） as TA-600 and additionally produced new Ni Al3and Ni2Al3phases due to the Ni-Al reactions. Furthermore, when the hot-pressing temperature was increased to 650°C, Kirkendall voids appeared in the Al3Ti layer（TA-650） and at the Al3Ti/Ni Al3interface（TAN-650）. Compared to TA-MIL composites, the thickness of the Al3Ti layer in the TAN-TMIL composites increased by four times when prepared at 600°C, but decreased by four times when prepared at 650°C. Electron backscatter diffraction（EBSD） and nano-indentation tests revealed that TAN-600 had multiple HS and more high-angle grain boundaries（HAGB）, optimizing the structure of TA-600. Importantly, this structural arrangement enhanced the interface effects and compressive properties of TAN-600. Tensile testing indicated that the crack-free NiAl3/Ni2Al3layer contributed to the strength of TAN-600, ensuring multi-directional fracture in the Al3Ti layer. This research provides insights for improving the strength and toughness of TA-MIL composites.

关键词： Laminated composites Ti-Al-Ni ternary system Multiple heterostructures Microstructure evolution mechanical properties

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Enhancing the creep resistance in a RE-free cast Mg-Al-Ca alloy through microalloying of Ti

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Journal of Magnesium and Alloys 2025年第1期13卷 414-428页

作者： Zhuang Cui Yang Liu Ying Zeng Manping Liu Xiaochun Liu Shiwei Xu Xuefei Chen Qudong Wang School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

High temperature performance of magnesium alloys can be tailored by either grain size or precipitates in the grain *** this study,exceptional creep resistance was successfully acquired in a RE-free cast Mg-Al-Ca-Ti(AC51Ti)*** of Ti(0.01 wt.%)has been found to be beneficial to the improvement of the tensile creep resistance in a RE-free cast Mg-5Al-0.35Mn-(1Ca)(AC51)alloy,showing a low state creep rate(SCR)of 2.70×10^(−9)s^(−1)at 200℃/50 MPa,which is even better than that of many reported RE-containing Mg *** presence of trace Ti contributes to the substantial refinement and more uniform distribution of Al_(2)Ca precipitates in the *** the same time,the microalloying of Ti improves the solubility of Al and Ca in the *** is reasonable to believe that the microalloying of Ti induced re-organization of Al_(2)Ca precipitates,dissolved a larger amount of Al and Ca atoms into magnesium lattice,and increased the possibility of interaction between GB/dislocations and precipitates,which strongly correlates with the high temperature *** creep strengthening mechanisms primarily attributed to both second phase strengthening and solid solution strengthening were separately proposed based on the experimental investigations.

关键词： Magnesium alloy Creep mechanisms Al_(2)Ca phase Microalloying of Ti

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Ultrafast high-temperature sintering of high-entropy oxides with refined microstructure and superior lithium-ion storage performance

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Journal of Advanced Ceramics 2023年第10期12卷 1857-1871页

作者： Yuhang Bai Jinrui Li Hai Lu Jia Liu Cuiying Ma Bin Wang Xing Zhao Jun Deng School of Material Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China School of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China

High-entropy oxides(HEOs)have received significant attention because of their tunable mechanical properties and wide range of functional ***,the conventional method used for sintering HEOs requires prolonged processing time,which results in excessive grain growth,thereby compromising their ***,an ultrafast high-temperature sintering(UHS)strategy was adopted,and rock-salt composite(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O was selected as model *** parameters were tuned to illustrate the influence of applied current and soaking time on the densification process and resulting grain ***,the electrochemical performance of UHS-synthesized microparticles as anode materials in lithium-ion batteries was *** results show that the ultrafast heating rate results in fine grains with a diameter of~6–8μm and density of 95%,which are much smaller and similar to those obtained using the conventional sintering method(25μm and 96%).Moreover,the high surface area and reactivity of the microparticles,as well as their sluggish diffusion effect and structural stability,contribute to outstanding performance with high capacity(336 mA·h/g at 1 A/g)and ultralong cyclability(1000 cycles).This novel technique offers valuable insights into the densification process of HEOs and other materials and can thus broaden their application range.

关键词： ultrafast high-temperature sintering(UHS) high-entropy oxide(HEO) microstructure Li-ion battery anode materials

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