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Ultrasonic vibration assisted laser (UVAL) treatment of copper for superhydrophobicity

SURFACE & COATINGS technology 2021年 421卷 127386-127386页

作者： Zhao, Menglei Yang, Zeng Zhao, Jingnan Shrotriya, Pranav Wang, Yan Cui, Yuanchen Guo, Zhiquan Tianjin Univ Sci & Technol Tianjin Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China Iowa State Univ Dept Mech Engn Ames IA 50011 USA US Polyco 3901 1-45 South Ennis TX 75119 USA

In this paper, a hybrid ultrasonic vibration assisted laser (UVAL) prepared copper surface of super-hydrophobic was reported. After UVAL treatment, the water contact angle (WCA) of copper surface to 3 mu L water was 157.4 degrees and the water slip angle (WSA) was less than 10 degrees. The wettability, microstructure, chemical composition and durability of copper surface were measured by contact angle measuring instrument, field emission scanning electron microscopy (FESEM), surface predatory X-ray diffraction (XRD) and three-dimensional morphology. The results revealed that after UVAL treatment, the microcoral-like structure and nano-grass structure were formed on the surface of the sample, which were similar to the surface of lotus leaf. Ultrasonic vibration combined with laser treatment can accelerate the adsorption of airborne hydrocarbon contaminations on the surface of micro and nanostructures, and reduce the surface energy of copper particles on the surface. This study provides a fast, convenient and effective method for the rapid preparation of stable superhydmphobic copper surface.

关键词： Laser treatment Super-hydrophobic Ultrasonic vibration Copper Micro-structure

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Flexible TiO2 nanograss array film decorated with oxygen vacancies introduced by facile chemical reduction and their photocatalytic activity

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ENVIRONMENTAL technology & INNOVATION 2022年 25卷

作者： Ping, Xuecheng Zhang, Yan Zhao, Qian Lu, Yun Hao, Liang Tianjin Key Lab Integrated Design & line Monitori Tianjin Peoples R China Tianjin Univ Sci Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Tianjin Int Joint Res & Dev Ctr Low Carbon Green Tianjin Peoples R China Chiba Univ Grad Sch Sci & Engn Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan

Flexible TiO2 nanograss array film was prepared by simple chemical oxidation of Ti wire mesh at a low temperature of 353 K. To improve its visible-light-driven photocatalytic activity, we further carried out a low-temperature chemical reduction to introduce oxygen vacancies in the solution of ethylene glycol (EG) and ammonium fluoride (NH4F). The results of XPS and EPR confirmed the formation of surface and bulk oxygen vacancies was confirmed, and their concentrations increased as the reduction time increased. Compared with the as-annealed TiO2 film, the as-reduced specimens exhibited higher visible-light-driven photocatalytic activity. When reduction time was 48h, the photocatalytic activity was increased by 15.8 times compared to the as-annealed sample. The remarkable improvement in photocatalytic activity should be ascribed to the oxygen vacancies' introduction. The most excellent photocatalytic performance was obtained when a suitable concentration ratio of surface oxygen vacancies to bulk oxygen vacancies was reached. Low-temperature chemical reduction in the solution of EG + NH4F is very efficient and convenient for introducing defects such as oxygen vacancies and Ti3+. (C) 2021 The Author(s). Published by Elsevier B.V.

关键词： TiO(2 )nanograss array film Oxygen vacancy Chemical reduction Visible light Photocatalytic activity

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Construction of LSPR enhanced Ag/Cu2O/CuO Z-scheme heterojunction films and their superior photocatalytic redox activity

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Journal of Alloys and Compounds 2025年 1010卷

作者： Zhu, Mengran Hao, Liang Zhao, Qian Hu, Te Guan, Sujun Lu, Yun Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment Tianjin300222 China College of Mechanical Engineering Tianjin University of Science & Technology No. 1038 Dagu Nanlu Hexi District Tianjin300222 China Tianjin International Joint Research and Development Center of Low-carbon Green Process Equipment Tianjin300222 China College of Materials Science and Hydrogen Energy Engineering Foshan University No. 18 Jiangwanyilu Guangdong Foshan528000 China Research Center for Space System Innovation Tokyo University of Science No. 2641 Yamazaki Chiba Prefecture Noda-shi278-8510 Japan School Technological University Chengdu Technological University No. 2 Huapaifang Street Chengdu610031 China Graduate School of Science and Engineering Chiba University No. 1-33 Yayoi-cho Chiba Inage-ku263-8522 Japan

Traditional methods, including wet chemistry, annealing, and photoreduction, were employed to prepare Ag/Cu2O/CuO composite films. Analysis indicates that the Cu2O/CuO heterojunction films were formed after wet chemical treatment and annealing. After the photoreduction reaction, Ag0 nanoparticles and nanosheets modified the Cu2O/CuO heterojunction films at the nano and micro scales. The Ag modification not only enhanced the absorption of solar light of the heterojunction but also improved the transfer and separation of photogenerated electrons within the heterojunction, primarily attributed to the localized surface plasmon resonance (LSPR) effect of elemental silver. Compared to Cu2O/CuO films, the performance of Ag/Cu2O/CuO films in the photocatalytic degradation of MB increased by up to two times, while the performance in the photocatalytic reduction of Cr6+ improved by up to 2.56 times. Through the analysis of the charge transfer pathways of photogenerated electrons and holes within this system, we propose that the heterojunction formed between Cu2O and CuO is of the Z-type. This study will provide valuable guidance for the design of highly efficient copper-based photocatalysts. © 2024 Elsevier B.V.

关键词： Ag/Cu 2 O/CuO Heterojunction Film Photocatalytic redox

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Effect of nanosecond pulsed laser parameters on the color making of 304 stainless steel

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OPTICS AND LASER technology 2020年第0期126卷 106104-000页

作者： Ma, Xiaolei Nie, Xihan Zhao, Jingnan Shrotriya, Pranav Zhang, Yan Cui, Yuanchen Wang, Junyi Tianjin Univ Sci & Technol Tianjin Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China Iowa State Univ Dept Mech Engn Ames IA 50011 USA US Polyco 3901 1-45 South Ennis TX 75119 USA

Nanosdecond pulsed laser (532 nm) was used to irradiate stainless steel, resulting in various colors permeating the sample surface. The surface morphology, element composition, phase composition, film thickness and surface reflectivity were analyzed by field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), ellipsometer and diffuse reflection spectroscopy (DSR). The effect of laser scanning speed and hatch distance on the resulting surface coloring of stainless steel was investigated. The results showed that a thin oxide film was formed on the sample surface irradiated by the laser. The sample surface presented different colors due to thermal absorption effect caused by the different laser scanning speed and the hatch distance. Furthermore, the effect of laser parameters on the stability of coloration was studied by using the chromatic aberration evaluation formula CIEL*a*b*.

关键词： Stainless steel Color making Nanosecond pulsed laser Scanning speed Hatch distance

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A method to make the performance of photocatalytic films rivals that of photocatalytic nanoparticles through water flow

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2023年第17期34卷 1347-1347页

作者： Zhu, Enlong Jia, Rong Hao, Liang Hu, Te He, Yiqiang Guan, Sujun Lu, Yun Tianjin Key Lab Integrated Design & On Line Monito Tianjin 300222 Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Tianjin Int Joint Res & Dev Ctr Low Carbon Green P Tianjin 300222 Peoples R China Foshan Univ Coll Mat Sci & Hydrogen Energy Engn 18 Jiangwanyilu Foshan 528000 Guangdong Peoples R China Jiangsu Ocean Univ Sch Mech Engn 59 Cangwulu Lianyungang 222005 Peoples R China Toyo Univ Bio Nano Elect Res Ctr 2100 Kujirai Kawagoe Saitama 3508585 Japan Chiba Univ Grad Sch Sci & Engn 1-33 Yayoi ChoInage Ku Chiba 2638522 Japan

Anodic oxidation followed by a solvothermal method is used to prepare Bi/BiOI/ZnO heterojunction films. The formed ZnO nanoneedles have a length-to-width ratio of more than 8. The diameter of the formed Bi nanoparticles is no more than 10 nm. The results show that the ZnO and Bi/BiOI/ZnO heterojunction films possess piezoelectric performance. Using these films as critical materials, we designed and built a closed-cycle piezo-photocatalytic system to degrade RhB organic dye in wastewater. When the slope angle is 15 & DEG;, the dye photodegradation performance is increased to the highest value. When the pump flux increases from 240 to 500 L & BULL;h(-1), the photodegradation performance of Bi/BiOI/ZnO heterojunction film reaches the maximum value, 2.125 x 10(-2) min(-1). The photocatalytic activity is 37.9 times higher than the pristine ZnO film in stationary RhB solution. The significant performance boosting is attributed to the piezo-photocatalytic synergistic strategy triggered by water flowing. In addition to the role of piezoelectric catalysis, the built-in electric field generated by the piezoelectric potential inhibits the recombination of photoinduced carriers. The heterojunction enhances the transfer efficiency of photogenerated carriers. The solution flowing increases the dissolved oxygen amount and accelerates the mass transfer. The solution thinning improves the dissolved oxygen amount and increases light transmission. The piezo-photocatalytic system can also be used to degrade high-concentration organic wastewater, providing us with an innovative idea for the practical application of photocatalysis.

关键词： Zinc oxide

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Solar-responsive photocatalytic activity of amorphous TiO2 nanotube-array films

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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING 2019年 89卷 161-169页

作者： Hao, Liang Tang, Siqi Yan, Jiancheng Cheng, Lijun Guan, Sujun Zhao, Qian Zhu, Zheng Lu, Yun Int Joint Res Ctr Low Carbon Green Proc Equipment Tianjin Peoples R China Tianjin Key Lab Integrated Design & Line Monitori Tianjin Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Sichuan Univ West China Sch Med 37 Guoxue St Chengdu 610041 Sichuan Peoples R China Tokyo Univ Sci Dept Phys Shinjuku Ku 1-3 Kagurazaka Tokyo 1628601 Japan Chiba Univ Grad Sch Sci & Engn Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan

We prepared amorphous and anatase TiO2 nanotube-array (NA) films by anodic oxidation followed by annealing. We characterized the as-prepared samples with X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence spectrum (PL), electron spin resonance (ESR), and so on. The XPS and EPR spectra show that the surface of amorphous TiO2 NA films absorbs chemically dissociated water much easier than that of anatase TiO2 NA films. The amorphous TiO2 NA films show higher photocatalytic activity than anatase TiO2 NA films in RhB degradation under the irradiation of simulated solar light. Furthermore, the photocatalytic activity of amorphous TiO2 NA films ascribes to visible-infrared light rather than UV light. On the contrary, that of anatase TiO2 NA films mainly attributes to UV light. The EPR spectra, photocurrent density and photocatalytic activity evaluation reveal that totally different mechanisms play the key role in photocatalytic degradation of RhB dye for amorphous and anatase TiO2 NA films. For amorphous one, visible light excites electrons from RhB dye molecules and they quickly transfer to the conduction band of amorphous TiO(2 )NA films, which acted as electron trapping centers. The electron loss of RhB molecules results in their oxidation. In a word, the dye self-sensitization is responsible to the high photocatalytic degradation of RhB dye. On the other hand, the classical theory of photocatalysis could perfectly explain the photocatalytic activity of anatase one. Therefore, this work confirmed on the fact that amorphous TiO2 is inactive. This work completely clarified the origin of high photocatalytic activity of amorphous TiO2.

关键词： Amorphous TiO2 nanotube-array films Photocatalytic activity Dye sensitization Simulated solar light

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Synergetic improvement strategy on thermoelectric performance of CuAlO2 compacts

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CERAMICS INTERNATIONAL 2019年第5期45卷 5486-5490页

作者： Hao, Liang Toyama, Yuta Feng, Ningbo Jin, Yingrong Lu, Yun Int Joint Res Ctr Low Carbon Green Proc Equipment Tianjin Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Chiba Univ Coll Mech Engn Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan Chiba Univ Grad Sch Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan Xihua Univ Sch Mat Sci & Engn 99 Jinzhou Rd Chengdu 610039 Sichuan Peoples R China

We fabricated Sr and Ca-doped CuAlO2 compacts from the mixed powder of CuO, Cu2O, Al2O3, and SrO or CaO by multi-pass hot pressing followed by spark plasma sintering (SPS). The XRD results showed the reaction of CuO, Cu2O and Al2O3 was rather complete and only CuAlO2 single phase was formed when the additive amount of SrO or CaO was appropriate. Multi-pass hot pressing increased the relative density and the usage of plate-like Al2O3 as reaction raw material enhanced the orientation degree. In spite of performance improvement conflicts through elemental doping, density increase and orientation improvement, the measurement on the thermoelectric performance indicated that the electrical resistivity, Seebeck coefficient, power factor, dimensionless figure of merit (Z7) were improved to varying degrees through the synergetic action of elemental doping, density increase, and orientation control. The highest power factor and ZT of the Ca-doped CuAlO2 compacts reached 1.54 x 10(-4) W m K-2 and 0.015 at 973 K, respectively. The thermoelectric performance was higher than those of CuAlO2 at the same temperature in published work before.

关键词： CuAlO2 thermoelectrics Elemental doping Density increase Orientation Control

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Oxygen vacancies in TiO2/SnOx coatings prepared by ball milling followed by calcination and their influence on the photocatalytic activity

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APPLIED SURFACE SCIENCE 2019年 466卷 490-497页

作者： Hao, Liang Yan, Jiancheng Guan, Sujun Cheng, Lijun Zhao, Qian Zhu, Zheng Wang, Yao Lu, Yun Liu, Jizi Int Joint Res Ctr Low Carbon Green Proc Equipment Beijing Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Tokyo Univ Sci Dept Phys Shinjuku Ku 1-3 Kagurazaka Tokyo 1628601 Japan Tianjin Univ Sci & Technol Coll Elect Informat & Automat Tianjin Peoples R China Chiba Univ Grad Sch Sci & Engn Inage Ku 1-33Yayoi Cho Chiba 2638522 Japan Nanjing Univ Sci & Technol Herbert Gleiter Inst Nanosci 200Xiaolingwei St Nanjing 210094 Jiangsu Peoples R China

We prepared TiO2/SnOx(x = 1, 2) composite coatings through ball milling followed by calcination. The composite coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), spherical aberration corrected scanning transmission microscopy (Cs-corrected STEM), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and other techniques. Bulk oxygen vacancies in the form of vacancy clusters rather than individual sites were directly observed by Cs-corrected STEM. With an increase in the calcination temperature from 873 K to 1073 K or holding time from five hours to ten hours, the concentration of bulk defects also increased. On the other hand, the photocatalytic activity of the as-prepared samples for degrading MB dye increased with the concentration increase of bulk defects. Sample 973 K-10 h showed the best photocatalytic activity whether under the irradiation of UV light or visible light. With a further increase in the concentration of bulk oxygen vacancies, the photocatalytic activity decreased, although surface Ti3+ defects appeared. In other words, a moderate concentration of bulk defects could benefit the enhancement of the photocatalytic activity of the as-prepared samples. Ball milling followed by calcination is an effective method to introduce defects such as oxygen vacancies.

关键词： TiO2/SnOx Photocatalyst Coatings Oxygen vacancy Cs-corrected STEM

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In-line inspection solution for codes on complex backgrounds for the plastic container industry

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MEASUREMENT 2019年 148卷 106965-000页

作者： Liang, Qiaokang Zhu, Wei Sun, Wei Yu, Zhun Wang, Yaonan Zhang, Dan Hunan Univ Coll Elect & Informat Engn Changsha 410082 Hunan Peoples R China Hunan Univ Hunan Key Lab Intelligent Robot Technol Elect Mfg Changsha 410082 Hunan Peoples R China Hunan Univ Natl Engn Lab Robot Vis Percept & Control Changsha 410082 Hunan Peoples R China T Line Technol CO LTD Suqian 223700 Peoples R China York Univ Dept Mech Engn Toronto ON M3J 1P3 Canada

Machine vision technologies have been widely used for automating the product quality control, but the defect inspection for codes on complex backgrounds is still a challenging task in the plastic container industry. In this work, an efficient and accurate inspection solution based on deep learning was proposed aiming at the detection of codes on complex backgrounds for the plastic container such as beverage packages. Firstly, image processing algorithms such as the region translation method, morphological processing, and image matching technology based on SIFT (Scale Invariant Feature Transform) features were implemented to generate synthetic defective samples, which moderated the class-imbalance problem. Data augmentation strategies were used to increase the amount of training data. Secondly, the ShuffleNet V2 framework was adapted to inspect inkjet codes on complex backgrounds. Additionally, the transfer learning was used to transfer the trained model to other inspection tasks for different kinds of packages. Finally, the proposed approach was built onto an in-line code inspection apparatus for the plastic container industry, and an accuracy of 0.9988 was achieved. The in-line testing results of false detection and omission detection rates demonstrated that the proposed solution can fully meet the production requirements. To the best of our knowledge, this report describes the first time that deep learning has been applied to the industrial defect inspection for the plastic container industry. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Code inspection Deep learning ShuffleNet Transfer learning

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Study on characteristics of magnetic memory testing signal based on the stress concentration field

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IET SCIENCE MEASUREMENT & technology 2017年第1期11卷 2-8页

作者： Liu, Bin He, Yao Y. Zhang, Hai Fernandes, Henrique Fu, Ying Maldague, Xavier Shenyang Univ Technol Inst Informat Sci & Technol Adv On Line Detect Key Lab Shenyang 110870 Peoples R China Univ Laval Dept Elect & Comp Engn Comp Vision & Syst Lab 1065 Av Med Quebec City G1V 0A6 PQ Canada Wuyi Univ Coll Mech & Elect Engn Quantum Phys Lab Wuyishan 354300 Peoples R China

Metal magnetic memory testing technology has been effectively used in stress concentration areas and micro-cracks detection of ferromagnetic metal components. However, due to the lack of profound theoretical basis and effective experimental research, the magnetic memory signal characteristics and magnetism quantitative relationship has not yet been determined. In this study, the full electronic potential magneto-mechanical model is established which is using the norm conserving pseudo-potential algorithm based on the first-principle. The quantitative relationship is then calculated between the stress concentration and the magnetic memory signal. The calculation results show that the changes of the wave function, which result from the stress concentration in the solid band, are the fundamental cause of the magnetic memory phenomenon, and atomic magnetic moment, lattice constant and the magnetic flux leakage signal strength linearly changes as a function of stress trend. As the stress concentration reached the critical stress point, the lattice structure was damaged, and the magnetic memory signal had undergone mutation. In this study, the experimental results are consistent with the theoretical calculation results.

关键词： magnetic storage ferromagnetic materials microcracks crack detection crack-edge stress field analysis magnetomechanical effects ab initio calculations pseudopotential methods lattice constants magnetic moments magnetic memory testing signal stress concentration field microcrack detection ferromagnetic metal components full electronic potential magnetomechanical model norm conserving pseudopotential algorithm first-principle calculation wave function atomic magnetic moment lattice constant magnetic flux leakage signal strength critical stress point

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