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Preparation of cerium and yttrium doped ZnO nanoparticles and tracking their structural,optical,and photocatalytic performances

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Journal of Rare Earths 2023年第5期41卷 682-688,I0002页

作者： Essia Hannachi Yassine Slimani Muhammad Nawaz R.Sivakumar Zayneb Trabelsi R.Vignesh Sultan Akhtar Munirah A.Almessiere Abdulhadi Baykal Ghulam Yasin Department of Nuclear Medicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPO.Box 1982Dammam31441Saudi Arabia Department of Physics Alagappa UniversityKaraikudi630003India Faculty of Sciences of Bizerte University of CarthageZarzouna7021Tunisi Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia State key laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBejing 100029China Institute for Advanced Study College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Yttrium(Y)and cerium(Ce)co-doped ZnO nanoparticles(NPs)were synthesized via the simple sol-gel auto-combustion *** effect of Ce and Y doping on the structure,morphology,optical,Zeta potential,and photocatalytic activities of ZnO NPs was examined by Fourier transform infrared(FTIR)spectrometer,X-ray diffraction(XRD),transmission electron microscope(TEM),uv-vis spectrophotometer,and Zetasizer *** data show that the fabricated samples crystallize into a hexagonal wurtzite *** dopants Y and Ce affect the crystal structure of ZnO *** crystallite size is reduced with the co-doping *** results confirm the nano-sized particles of the prepared *** increase in optical bandgap values from 3.19 eV for x=0.0 to 3.22,3.24,and 3.25 eV for x=0.01,0.03,and 0.05 samples was confirmed by uv-Vis spectroscopy analysis.Y and Ce co-doped ZnO nanoparticles show significant alteration of zeta potential and photocatalytic properties compared to undoped ZnO ***,undoped ZnO shows better stability in deionized water as compared to Ce-Y doped ZnO NPs and exhibits high photocatalytic activity(degradation rate,97.92%)for methyl orange(MO)degradation.

关键词： ZnO nanoparticles Co-doping Rare earth Structure Bandgap energy Photocatalytic activity

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Enhanced photodynamic therapy of mixed phase TiO2（B）/anatase nanofibers for killing of HeLa cells

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Nano Research 2014年第11期7卷 1659-1669页

作者： Shuchao Zhang Dongjiang Yang Dengwei Jing Hongwei Liu Long Liu Yi Jia Meihua Gao Liejin Guo Ziyang Huo Department of Blood Transfusion the Affifiated Hospital of Medical College Qingdao University Oingdao 266003 China Department of Immunology Medical College of Qingdao University Qingdao266000 China Collaborative Innovation Centre for Marine Biomass Fibers Materials and Textiles of Shandong Province College of Chemical and Environmental Engineering Qingdao University Qingdao China Queensland Micro- and Nanotechnology Centre (QMNC) Griffith University Nathan Brisbane QLD 4111 Australia International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering College of Chemistry Chemical and Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China Australian Centre for Microscopy and Microanalysis (ACMM) the University of Sydney Sydney NSW 2006 Australia

Photodynamic therapy （PDT）, which is a procedure that uses photosensitizing drug to apply therapy selectively to target sites, has been proven to be a safe treatment for cancers and conditions that may develop into cancers. Nano-sized TiO2 has been regarded as potential photosensitizer for uv light driven PDT. In this study, four types of TiO2 nanofibers were prepared from proton tri-titanate （H2T3O7） nanofiber. The as-obtained nanofibers were demonstrated as efficient photosensitizers for PDT killing of HeLa cells. MTT assay and flow cytometry （FCM） were carried out to evaluate the biocompatibility, percentage of apoptotic cells, and cell viability. The non-cytotoxicity of the as-prepared TiO2 nanofibers in the absence of uv irradiation has also been demonstrated. Under uv light irradiation, the TiO2 nanofibers, particularly the mixed phase nanofibers, displayed much higher cell-killing efficiency than Pirarubicin （THP）, which is a common drug to induce the apoptosis of HeLa cells. We ascribe the high cell- killing efficiency of the mixed phase nanofibers to the bandgap edge match and stable interface between TiO2（B） and anatase phases in a single nanofiber, which can inhibit the recombination of the photogenerated electrons and holes. This promotes the charge separation and transfer processes and can produce more reactive oxygen species （ROS） that are responsible for the killing of HeLa cells.

关键词： photodynamic therapy titanium oxides (TiO2) nanomaterials apoptosis mixed phase

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Resists Based on Hyperbranched Polyesters for Microlens Array Fabrication

Resists Based on Hyperbranched Polyesters for Microlens Arra...

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The 8th International Conference on Radiation Curing

作者： Zongcai Fong Department of Polymer Science and Engineering State key Lab for Polymeric materials Engineering Sichuan University Cheng Du 610065 China

＜正＞Three-component photoresists were prepared from hyperbranched polyester, multifunctional acrylate monomers and photoinitiator. The hyperbranched resin had -COOH, -OH and methacryloxy groups on their chain ends. The dried resist on glass substrate showed H- HB pencil hardness. Sensitivity and contrast upon uv exposure were tunable by development solution and the amount of photoinitiator. In a case, high sensitivity with E0 -5.5 mJ/cm2 and high contrast with μ-8were obtained for resist exposed with a mixed uv light and developed with TMAH aqueous. The resist exhibited a unique linear relationship on exposure time with etching depth. This property provided a controlling of surface profile of micro optical elements fabricated with photoresists. Microlens arrays （200×200 μm） were prepared with a moving-mask using this photoresist.

关键词： Hyperbranched polyester. Photoresist. Microlens array uv curing MEMS

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Process for the Synthesis of Ferrate (VI) Alkali Metal Dry

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Advances in materials Physics and Chemistry 2015年第1期5卷 10-15页

作者： Abdellatif El Maghraoui Abdelaziz Zerouale Mustapha Ijjaali laboratory of Chemistry of Condensed Mater Faculty of Sciences and Technology Sidi Mohammed Ben Abdellah University Fez Morocco

The iron compounds in the oxidation state (VI) have the specific advantage of being powerful oxidants and bactericides. This feature explains their particular interest in the treatment of water. The aim of this work is to prepare Na2FeO4 stable at ambient in order to optimize the key parameters influencing the performance of the oxidation of iron (II) to iron (VI), as well as to monitor its degradation over time. The synthesis of this phase has been carried out by using the dry reaction Na2O2 with Fe2O3 with a temperature of 700°C for a reaction time of 13 hours with a Na/Fe ratio of 4 to make it possible to simplify the synthesis procedure, to minimize the cost and enhance the production of iron (VI) to meet the growing demand of ferrate (VI) for its interest in water treatment. The obtained phase was characterized by uv spectrophotometer by measuring the optical density at a wavelength of 507 nm.

关键词： Ferrate Bactericide Antioxidant Flocculant Coagulant Water Treatment

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Synthesis and Photoluminescence of Eu-doped ZnO Nanosheets

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Chemical Research in Chinese Universities 2011年第2期27卷 174-176页

作者： WANG Dan-dan YANG Jing-hai CAO Jian LANG Ji-hui GAO Ming LIU Xiao-yan key laboratory of Excited State Processes Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 P R. China Graduate School of Chinese Academy of Sciences Beo＇ing 100049 P R. China Institute of Condensed State Physics Jilin Normal University Siping 136000 P R. China

Eu-doped ZnO nanosheets were synthesized successfully by means of the hydrothermal method. The X-ray diffraction（XRD） pattern shows that the sample is a single phase with the ZnO-like wurtzite structure. And the X-ray photoelectron spectrum suggests that there are Eu3＋ ions in the matrix of the sample. Eu3＋-related red emissions resulted from energy transfer were observed for the nanosheets under uv laser excitation. The uv, green and yellow emissions were also seen in the photoluminescence spectra.

关键词： Oxide material Chemical synthesis Optical property

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Storage and transfer of optical excitation energy in GaInP epilayer:Photoluminescence signatures

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Journal of materials Science & technology 2019年第7期35卷 1364-1367页

作者： Shijie Xu Ying Huang Zhicheng Su Rongxin Wang Jianrong Dong Deliang Zhu Department of Physics and Shenzhen Institute of Research and Innovation (HKU-SIRI)The University o f Hong KongPokfulam RoadHong KongChina Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of SciencesSuzhou215123China Guangdong Research Center for Interfacial Engineering of Functional materials and College of Materials Science and EngineeringShenzhen UniversityShenzhen518060China

GaInP alloy could be the most trusted key material for fabricating super-high-efficiency single-and multijunction solar cells, especially for space applications. The storage and transfer of optical excitation energy in this key alloy is thus a key subject of the energy conversion from optical to electrical. In this article we present a study of the subject through investigating photoluminescence(PL) degradation in the GaInP epilayer at 4 K under the continuous optical excitations of ultraviolet(uv) 325 nm, visible 488.0 and 514.5 nm lasers. It is found that the decline of PL intensity with the irradiation time may be represented by I(t)/I0=(1 + tτ-1)-1+C, where I0 is the luminescence intensity at the beginning of irradiation, a time constant, and C a background. Moreover, the PL degradation degree reduces with increasing the excitation wavelength. In addition, some red shift of the PL peak is observed accompanying with the intensity decline under the uv laser excitation. These PL signatures indicate that the localized carriers within the local atomic ordering domains play a major role in the storage and transfer of the excitation energy via photon recycling processes.

关键词： GaInP alloy Photoluminescence Energy transfer Photon recycling

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Variations of DON Content in Grain during Wheat Tempering at Different Temperatures

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Agricultural Science & technology 2014年第4期15卷 546-549页

作者： Zhiming GENG Dan YANG Pingping ZHANG Miaoping ZHOU Daoying WANG Fang LIU Muhan ZHANG Yongzhi ZHU Institute of Agricultural Products Processing Jiangsu Academy of Agricultural Sciences Provincial key laboratory of Agrobiology Jiangsu Academy of Agricultural Sciences

[Objective] The aim of this study was to observe variations of DON content in grain of two wheat cultivars during tempering at different temperatures, and explore the possible causes of the variations. [Method] Two naturally Fusarium-infested wheat samples Youmai 3 and Yangmai 14 were selected as experimental materials. Tempering was carried out at different temperature （15, 25 and 35 ℃） for 48 h. During tempering, wheat grain samples were collected every 8 h. DON contents in tempered grain were measured by HPLC coupled with uv detector. [Result] For Youmai 3, DON contents were in the ranges of 3.94-12.49, 4.26-6.11 and 3.41- 7.91 μg/g during tempering at 15, 25 and 35 ℃, respectively. The highest DON contents were observed at the 32^nd hour at 15 ℃, the 8^th hour at 25 ℃ and the 32^rd hour at 35 ℃, respectively. After tempering for 48 h, DON contents in grain were increased by 175.1%, 27.5% and 7.2%, respectively. For Yangmai 14, DON contents were in the ranges of 0.55-1.56, 0.39-0.77 and 0.57-3.17 μg/g during tempering at 15, 25 and 35 ℃, respectively. The highest DON contents were ob- served at the 24^th hour at 15 ℃, the 40^th hour at 25 ℃ and the 48^th hour at 35 ℃, respectively. After tempering for 48 h, DON contents in grain were increased by 94.5% at 15 ℃ and 456.1% at 35 ℃, respectively, whereas it was decreased by 35.0% at 25 ℃. From the point of view of reducing DON level, 15 ℃ was not rea- sonable for the tempering of both wheat cultivars, and tempering at 35 ℃ for 16 h and tempering at 25 ℃ for 24 h appeared to be desirable for Youmai 3 and Yang- mai 14, respectively. [Conclusion] The results suggested controlling the tempering temperature and time would be helpful to reduce DON level in grain.

关键词： Fusarium Deoxynivalenol Cereals Wheat tempering

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Crosslinked Polyethyleneimine Gel Polymer Interface to Improve Cycling Stability of RFBs

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Energy Material Advances 2022年第1期2022卷 367-376页

作者： Hyung-Seok Lim Sujong Chae Litao Yan Guosheng Li Ruozhu Feng Yongsoon Shin Zimin Nie Bhuvaneswari Modachur Sivakumar Xin Zhang Yangang Liang David Jonathan Bazak Vaithiyalingam Shutthanandan Vijayakumar Murugesan Soowhan Kim Wei Wang Energy and Environment Directorate Pacific Northwest National LaboratoryRichlandWA 99354USA Physical&Computational Science Directorate Pacific Northwest National LaboratoryRichlandWA 99354USA

Redox flow batteries are considered a promising technology for grid energy ***,capacity decay caused by crossover of active materials is a universal challenge for many flow battery systems,which are based on various *** this paper,using the vanadium redox flow battery as an example,we demonstrate a new gel polymer interface(GPI)consisting of crosslinked polyethyleneimine with a large amount of amino and carboxylic acid groups introduced between the positive electrode and the *** GPI functions as a key component to prevent vanadium ions from crossing the membrane,thus supporting stable long-term *** voltammetry(CV)and electrochemical impedance spectroscopy(EIS)measurements were conducted to investigate the effect of GPI on the electrochemical properties of graphitic carbon electrodes(GCFs)and redox reaction of catholyte.X-ray photoelectron spectroscopy(XPS)and ^(1)H nuclear magnetic resonance(NMR)spectra demonstrated that the crosslinked GPI is chemically stable for 100 cycles without dissolution of polymers and swelling in the strong acidic *** from inductively coupled plasma mass spectrometry(ICP-MS),Fourier-transform infrared(FTIR)spectroscopy,and energy-dispersive X-ray(EDX)spectroscopy proved that the GPI is effective in maintaining the concentration of vanadium species in their respective half-cells,resulting in improved cycling stability because of it prevents active species from crossing the membrane and stabilizes the oxidation states of active species.

关键词： NMR vanadium swelling

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A comparison of hepatic lipid metabolism and fatty acid composition in muscle between Duroc×Landrace×Yorkshire and Tibetan pigs from three regions

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Food materials Research 2022年第1期2卷 66-73页

作者： Zhikang Yin Fan Liu Xuedong Gu Li Zhang Yuan Ma Miao Zhang Hui Liu Jing Yan Chunbao Li key laboratory of Meat Processing and Quality Control MOEKey Laboratory of Meat ProcessingMARAJiangsu Collaborative Innovation Center of Meat Production and ProcessingQuality and Safety ControlCollege of Food Science and TechnologyNanjing Agricultural UniversityNanjing 210095P.R.China College of Food Science Tibet Agriculture and Animal Husbandry UniversityNyingchi 860000P.R.China College of Food Science and Engineering Gansu Agricultural UniversityLanzhou 730070P.R.China School of Food and Bioengineering Xihua UniversityChengdu 610039P.R.China

Qinghai-Tibet plateau with an average altitude above 4,000 m provides favorable conditions for Tibetan pigs that may have different meat quality from other pig *** study was designed to compare the differences in lipid metabolism in liver and fatty acid composition in muscle between Tibetan and Duroc×Landrace×Yorkshire(DLY)*** Tibetan pigs(n=10),Gannan Tibetan pigs(n=9),Nyingchi Tibetan pigs(n=10)and DLY pigs(n=10)were selected for the *** fasting for 12 h,they were slaughtered and blood,liver and muscle samples were taken for biochemical *** results showed that the intramuscular fat content was not significantly different for Tibetan pigs among the three regions(P>0.05),which was significantly higher than that of DLY pigs(P<0.05).However,the liver fat content of Gannan Tibetan pigs was significantly lower than those of DLY pigs and Aba and Nyingchi Tibetan pigs(P<0.05).The hepatic lipid metabolism may be stronger in DLY pigs than in Tibetan pigs,but lipid deposition in muscle is weaker in DLY pigs than that in Tibetan *** Tibetan pigs and Nyingchi Tibetan pigs had similar proportions of saturated,monounsaturated and polyunsaturated fatty acids,while Gannan Tibetan pigs and DLY pigs had similar types of fatty *** findings provide new insight into mechanisms of environmental and breed effects on pork quality.

关键词： Tibetan metabolism pigs

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Bactericidal and Photoeatalytie Activity of Fe^(3+)-TiO_2 Thin Films Prepared by the Sol-gel Method

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Journal of Wuhan University of technology(materials Science) 2008年第2期23卷 155-158页

作者： WANG Xun GONG Wenqi School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China School of Urban Construction Wuhan University of Science and Technology Wuhan 430070 China

Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and uv-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm uv-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.

关键词： sol-gel method bactericidal and photocatalytic activity escherichia coli bacillus subtillis iron doped TiO2 film

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