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Dielectric and Magnetic Properties of Nano-Structure BiFeO3Doped with Different Concentrations of Co Ions Prepared by Sol-Gel Method

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New Journal of Glass and Ceramics 2015年第3期5卷 59-73页

作者： Inas Kamal Batttisha Ibrahim Sayed Ahmed Farag Mostafa Kamal Mohamed Ali Ahmed Emad Girgis Fawzi El Desouki Hesham Azmi El Meleegi Fawzi El Desouki National Research centre (NRC) Solid State Physics Department 33 Bohouth St Dokki Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt National Research centre (NRC) Thin Film Lab Electron Microscope Department 33 Bohouth St Dokki Giza Egypt

BiFe1-xCoxO3 (x = 0, 0.03, 0.05 and 0.1) symbolic as (BFO, BF3CO, BF5CO and BF10CO) in powder form has been prepared by sol-gel technique using ethylenediamine tetraacetic acid (EDTA) as a chelating agent. X-ray diffraction (XRD) and FTIR analysis showed rhombohedra distorted BiFeO3 structure with compressive lattice distortion induced by the Co substitution at Fe sites. The transmission electron microscope (TEM) shows irregular particles. The additive of cobalt oxide has led to grains refining giving the following crystallite sizes of 18 nm for BF5Co. The scanning electron microscope (SEM) study reveals that the samples morphology shows relatively uniform grain size distribution. The dielectric properties of BiFeO3 nano-particles in the frequency range of 1 up to 5 MHz at RT revealed that the A.C. conductivity of the prepared samples reaches its maximum value in BF5CO. By decreasing BiFeO3 particle size as a result of doping with different Co ion concentrations, an enhancement in magnetization and a simultaneous suppression in current leakage occurred. The remnant magnetization Mr of BiFe1-xCoxO3 (x = 0, 0.03, 0.05, 0.1) ceramics significantly enhanced, which provides potential applications in information storage.

关键词： Nano-Structure Multiferroic BiFe1-xCoxO3 (x = 0 0.03 0.05 0.1) XRD FTIR TEM Remnant Magnetization

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Decoding ripple formation in single-layer transition metal chalcogenide lateral heterojunctions towards novel optoelectronic properties

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Nano Research 2025年第2期18卷 443-454页

作者： Haitao Yu Mingzi Sun Xiao Wu Zhiguo Xing Jiahao Kou Shipeng Liang Bolong Huang Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077China Research centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHong Kong 999077China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

For the ultrathin two-dimensional(2D)materials and lateral heterojunction,the formation of unstable but elastic ripples is commonly observed but is rarely studied,especially their correlations with different material *** fil the knowledge gap in this field,thiswork systematicallyexplores transitionmetal dichalcogenides(TMDCs)in a single component and lateral heterojunction with a series of ripple *** ripple formation energy is quantitatively classified into the initial elastic strain stage and fracture threshold stage based on Fermi-like *** structures reveal that the formation of ripples is accompanied by electron accumulations from flat surfaces to *** comparing the unilateral,decaying,and bilateral ripples in 2D lateral heterojunction,we confirm that Fermi-like distribution is still valid regardless of the shape of the ripples,where the thermodynamic and electronic properties are modulated by ripples-induced uneven *** main features of optical properties are not affected while the sensitivity to ripple-induced strains is *** importantly,the phonon properties further demonstrate the potential of ripples in promoting thermal conductivity,which are strongly correlated with the optical branch of anion *** work provides important theoretical guidance for the design and optimization of high-performance optoelectronic devices based on TMDC heterojunctions.

关键词： transition metal calcogenide lateral heterojunctions ripples optoelectronic properties two-dimensional(2D)materials

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Detection and evaluation of different morphological forms of Mycoplasma hominis in human semen

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Asian Journal of Andrology 2024年第1期26卷 71-76页

作者： Elizaveta Bragina Tatyana Sorokina Avtandil Chogovadze Yulia Shevchenko Vyacheslav Chernykh Olga Barkhatova Irina Rakovskaya Research centre for medical Genetics Moscow 115522Russia A.N.Belozersky Institute of Physico-Chemical biology Lomonosov Moscow State University Moscow 119992Russia Reprolab Limited Liability Company Moscow 119333Russia N.I.Pirogov Russian National Research medical University Moscow 117997Russia Federal Government Budgetary Institution"National Research Center for Epidemiology and Microbiology Named after Honorary Academician N.F.Gamaleya of the Ministry of Health of the Russian Federation" Moscow 123098Russia

Recently discovered microcolonial forms of Mycoplasma hominis(***)and their impact on human spermatogenesis are *** spermatozoa of 125 fertile men(sperm donors;from Reprobank[Reproductive Tissue Bank,Moscow,Russial)and of 93 patients with fertility problems(from the Federal State Budgetary Institution"Research centre for medical Genetics[RCMG]",Moscow,Russia)were *** colonies of *** and microcolonies were detected by molecular biological methods,culture of bacteria,and transmission electron *** unique structure of microcolonial cells,in which the cytoplasmic cylinder is surrounded by concentric electron-dense and electron-light layers with a periodicity of 12-14 nm,and the ability of microcolonial cells to attach to spermatozoa are *** patients with lower sperm quality,microcolonies of *** were detected 2.5 times more frequently than classical *** detection of microcolonies in the ejaculate and the frequent isolation of microcolonies from sperm samples of patients with fertility problems suggest that microcolonial cells may be one cause of infertility.

关键词： ejaculate fertility Mycoplasma hominis spermatogenesis transmission electron microscopy

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Mitochondrial Composition,Function and Stress Response in Plants

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Journal of Integrative Plant biology 2012年第11期54卷 887-906页

作者： Richard P. Jacoby Lei Li Shaobai Huang Chun Pong Lee A. Harvey Millar Nicolas L. Taylor ARC centre of Excellence in Plant Energy biology centre for Comparative Analysis of Biomolecular Networks (CABiN) MCS Building M316 The University of Western Australia 35 Stirling Highway Crawley WA 6009 Western Australia Australia Department of Plant Sciences University of Oxford South Parks Road Oxford OX1 3RB United Kingdom

The primary function of mitochondria is respiration, where catabolism of substrates is coupled to ATP synthesis via oxidative phosphorylation. In plants, mitochondrial composition is relatively complex and flexible an... 详细信息

关键词： Plant mitochondria respiration oxidative stress electron transport chain complex assembly ROS signaling carbon.

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An NT-3-releasing bioscaffold supports the formation of TrkC-modified neural stem cell-derived neural network tissue with efficacy in repairing spinal cord injury

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Bioactive Materials 2021年第11期6卷 3766-3781页

作者： Ge Li Bao Zhang Jia-hui Sun Li-yang Shi Meng-yao Huang Li-jun Huang Zi-jing Lin Qiong-yu Lin Bi-qin Lai Yuan-huan Ma Bin Jiang Ying Ding Hong-bo Zhang Miao-xin Li Ping Zhu Ya-qiong Wang Xiang Zeng Yuan-shan Zeng Key Laboratory for Stem Cells and Tissue Engineering Ministry of EducationSun Yat-sen UniversityGuangzhou510080China Guangdong Cardiovascular Institute Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong510100China Department of Histology and Embryology Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou510080China Institute of Spinal Cord Injury Sun Yat-sen UniversityGuangzhou510120China State Key Laboratory of Chemo/Biosensing and Chemometrics College of BiologyHunan UniversityChangsha410082China Co-innovation Center of Neuroregeneration Nantong UniversityNantong226001China Guangdong Provincial Key Laboratory of Brain Function and Disease Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou510080China Laboratory of Precision medical Genomics Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou510080China Department of electron microscope Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou510080China

The mechanism underlying neurogenesis during embryonic spinal cord development involves a specific ligand/receptor interaction,which may be help guide neuroengineering to boost stem cell-based neural regeneration for the structural and functional repair of spinal cord ***,we hypothesized that supplying spinal cord defects with an exogenous neural network in the NT-3/fibroin-coated gelatin sponge(NF-GS)scaffold might improve tissue repair *** test this,we engineered tropomyosin receptor kinase C(TrkC)-modified neural stem cell(NSC)-derived neural network tissue with robust viability within an NF-GS *** NSCs were genetically modified to overexpress TrkC,the NT-3 receptor,a functional neuronal population dominated the neural network *** pro-regenerative niche allowed the long-term survival and phenotypic maintenance of the donor neural network tissue for up to 8 weeks in the injured spinal ***,host nerve fibers regenerated into the graft,making synaptic connections with the donor ***,motor function recovery was significantly improved in rats with spinal cord injury(SCI)that received TrkC-modified NSC-derived neural network tissue ***,the results suggested that transplantation of the neural network tissue formed in the 3D bioactive scaffold may represent a valuable approach to study and develop therapies for SCI.

关键词： Neurotrophin-3 Tropomyosin kinase receptor C Self-organization Neural network tissue Spinal cord injury

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Laser-assisted ablation and plasma formation of titanium explored by LIBS,QCM, optical microscopy and SEM analyses along with mechanical modifications under different pressures of Ar and Ne

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Plasma Science and Technology 2023年第3期25卷 181-192页

作者： Maryam RIAZ Shazia BASHIR Asma HAYAT Zarish NAZ centre for Advanced Studies in Physics GC University Lahore

This study deals with the investigation of Nd:YAG laser-assisted ablation and plasma formation of Ti at irradiance of 0.85 GW cm-2 under Ar and Ne environment at various pressures ranging from 10-120 ***-induced breakdown spectroscopy is used to evaluate plasma parameters,whereas quartz crystal microbalance is used for ablation yield *** crater depth is evaluated by optical *** surface features are explored by scanning electron microscope(SEM) analysis and the micro-hardness is measured by a Vickers hardness *** is observed that the plasma parameters are higher in Ar than in Ne,and are strongly correlated with the ablation yield,ablation depth,surface features and hardness of laser-ablated *** parameters increase with increasing the pressure of environmental gases,attain their maxima at 40 Torr for Ar and at 60 Torr for ***,they show a decreasing trend up till a maximum pressure of 120 *** maximum value of the electron temperature(Te) is5480 K,number density(ne) is 1.46 × 1018 cm-3,ablation depth is 184 μm,ablation yield is3.9 × 1015 atoms/pulse and hardness is 300 HV in the case of Ar *** analysis reveals the growth of surface features,such as cones,ridges and pores,whose appearance is more distinct in Ar than Ne and is attributed to temperature,pressure and density gradients along with recoil pressure of the Ti plasma.

关键词： ablation plasma electron temperature electron density laser-induced breakdown spectroscopy surface structures

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Morphological Characterization and Hydrodynamic Behavior of Shortfin Mako Shark(Isurus oxyrinchus)Dorsal Fin Denticles

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Journal of Bionic Engineering 2019年第4期16卷 730-741页

作者： Fernandez-Waid Patricia Diez Guzman Bidaguren Inigo Izagirre Urtzi Blanco Jesus Maria Soto Manu Department of Zoology and Animal Cell biology Research Centre for Experimental Marine Biology and Biotechnology(PiE-UP V/EHU)University of the Basque CountryBilbao and Areatza z/gPlentzia 48620BizkaiaSpain Marine Research Division AZTITxatxarramendi s/n Sukarrieta 48395BizkaiaSpain Department of Nuclear Engineering and Fluid Mechanics School of Engineering(UP V/EHU)University of the Basque CountryPlaza lngeniero Torres Quevedo 148013 BilbaoBizkaiaSpain

The shortfin mako shark(Isurus oxyrinchus)is one of the fastest marine fishes,reaching speeds of up to 70 km·h^-*** speed is related to the skin surface design composed of dermal *** vary in size and shape according to placement on the body and minimize turbulence around the *** objective of this study is to analyze the interaction between seawater flow and denticles on the dorsal ***-resolution microscopy(scanning electron microscopy and confocal microscopy)were used to measure defined parts of the dermal *** measurements,along with ratios based on length-to-width define three morphologies(rounded,semi-rounded,long)that were 3D *** fluid dynamics simulated fluid passage over reconstructed denticles and describe hy-drodynamic efficiency under different *** increase in angle of inclination produced a relevant increase in the drag coefficient,especially for high velocity *** lowest drag coefficient values were found in long and semi-rounded,followed by rounded *** hydrodynamic behavior of shark skin demonstrates a relation to the morphological characteristics of dermal denticles on the dorsal *** is concluded that the best hydroefficiency relies on the rounded morphology and may serve to design hydrodynamically efficient surfaces or manmade assemblies.

关键词： denticles hydrodynamic mako shark computational fluid dynamics

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Organophosphine ligand derived sandwich-structural electrocatalyst for oxygen evolution reaction

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Journal of Energy Chemistry 2022年第7期31卷 74-83,I0003页

作者： Zejun Sun Wenjuan Xu Liutao Guo Qiang Han Jianyi Gao Jiaping Wang Yanru Feng Chengrui Li Qionglin Liang Hong-bin Sun Yang Yang Department of Chemistry Northeastern UniversityShenyang 110819LiaoningChina Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical biology(Ministry of Education) Department of ChemistryCenter for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084China Astronaut centre of China Beijing 100094China Nano Science Technology Center Department of Materials Science and EngineeringDepartment of ChemistryRenewable Energy and Chemical Transformation Cluster University of Central FloridaOrlandoFL 32826United States

The synchronous construction of metal phosphate and phosphorus-doped carbon structures is of great significance to innovate the design,synthesis,and application of catalysts,as these phosphoruscontaining composite materials have shown a remarkable contribution to ***,their preparation procedure generally involves using large amounts of excess phosphorus sources for phosphorization,which inevitably release poisonous PH_(3) or dangerous phosphorus ***,a strategy for in-situ formation of FePO_(4) embedded in P-doped carbon 2D nano film(FePO_(4)/PdC)is developed using a highly integrated precursor,which is a small molecular organophosphine ligand,1,1’bis(diphenylphosphine)ferrocene(DPPF).The multi-source precursor DPPF that contains Fe,P,and C is molecular-vapor-deposited on the nickel foam(NF)supported ZIF-67 nanosheets to obtain the composite catalyst,namely DPPF-500/ZIF-67/***_(4)/PdC encapsulated the ZIF-67 derived Co/N-doped carbon matrix(Co NC)to form a sandwich structure FePO_(4)/PdC@*** constructed catalyst shows good performance for OER,requiring an overpotential of only 297 m V to deliver 600 m A/cm^(2) with a Tafel slope of 42.7 m V dec^(-1).DFT calculations demonstrate that the synergistic effects between the metal active center and P-doped carbon film reduce the energy barriers and improve electron *** method of constructing P-containing catalysts overcomes the demand for additional P sources to realize eco-friendly fabrication and yields a unique structure with good catalytic activity.

关键词： Organophosphorus ligand Synchronous Synthesis FePO_(4) P-doped Carbon 2D nano film Oxygen evolution reaction

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Structural, Magnetic and Dielectric Properties of Fe-Co Co-Doped Ba0.9Sr0.1TiO3Prepared by Sol Gel Technique

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New Journal of Glass and Ceramics 2014年第2期4卷 19-28页

作者： Inas Kamal Batttisha Ibrahim Sayed Ahmed Farag Mostafa Kamal Mohamed Ali Ahmed Emad Girgis Hesham Azmi El Meleegi Fawzi Gooda El Desouky Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt National Research Center (NRC) Solid State Physics Department Dokki Giza Egypt National Research centre (NRC) Thin Film Lab Electron Microscope Department Dokki Giza Egypt

The structural, dielectric and magnetic properties of pure and Fe-Co co-doped Ba0.9Sr0.1TiO3, (Ba(1-x)SrxTiO3, where (x = 0.10) and (Ba0.9Sr0.1Ti(1-x-y)FexCoyO3), where (x = 0.1, y = 0) and (x = 0 and y = 0.10) and (x = 0.5, y = 0.5) in powder form, abbreviated as (BST) and (BST10FO), (BST10CO) and (BST5F5CO), respectively were prepared by a modified sol gel technique. Crystallization, surface morphology and electrical behavior of BST are improved by Fe3+ and Co2+ ions with optimized grain size. Phase identification by using X-ray diffraction and surface morphology will be studied by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM). Phase identification by using X-ray diffraction and surface morphology evaluation by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM) will be studied. The nano-scale presence and the formation of the tetragonal perovskite phase as well as the crystallinity were detected using the mentioned techniques. The dielectric properties of the prepared samples have been investigated as a function of temperature and frequency. The dielectric measurements are carried out in the frequency range of 42 Hz - 1 MHz, at temperature ranging between 25°C and 250°C. The results showed an abrupt decrease in the dielectric permittivity by increasing the frequency range. The magnetic hysteresis loop confirmed enhancement in the magnetization properties by co-doping with Fe3+-Co2+ ions. An increase in the saturation of the magnetization at room temperature was detected by decreasing the crystallite sizes of the prepared samples.

关键词： Sol Gel Nano-Structure Magnetic Hysteresis Loop Dielectric Permittivity Nano-Composite BaSrTiO3 (BST) TEM XRD SEM

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Feeding Biochar to Cows:An Innovative Solution for Improving Soil Fertility and Farm Productivity

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Pedosphere 2015年第5期25卷 666-679页

作者： Stephen JOSEPH Doug POW Kathy DAWSON David R.G.MITCHELL Aditya RAWAL James HOOK Sarasadat TAHERYMOOSAVI Lukas VAN ZWIETEN Joshua RUST Scott DONNE Paul MUNROE Ben PACE Ellen GRABER Torsten THOMAS Shaun NIELSEN Jun YE Yun LIN PAN Genxing LI Lianqing Zakaria M.SOLAIMAN Discipline of Chemistry University of Newcastle School of Materials Science and Engineering University of New South Wales electron Microscopy Center AIIMUniversity of Wollongong Institute of Resources Ecosystem and Environment of AgricultureNanjing Agricultural University Marron Brook Farm Warren Catchments Council 52 Bath StManjimup 6258 (Australia) Mark Wainwright Analytical centre University of New South Wales Wollongbar Primary Industries Institute NSW Department of Primary Industries Institute of Soil Water and Environmental SciencesThe Volcani CenterAgricultural Research Organization centre for Marine Bio-Innovation School of Biotechnology and Biomolecular SciencesThe University of New South Wales Soil biology and Molecular Ecology Group School of Earth and Environment (M087)The University of Western Australia

Addition of biochar produced through thermal decomposition of biomass has been seen as a strategy to improve soils and to sequester carbon （C）, but wide scale implementation of the technology requires to devise innovative profitable solutions. To develop biochar utilisation with an integrated system approach, an innovative program was implemented in 2012 on a 53-ha farm in Western Australia to determine the costs and benefits of integrating biochar with animal husbandry and improvement of pastures. Biochar was mixed with molasses and fed directly to cows. The dung-biochar mixture was incorporated into the soft profile by dung beetles. We studied the changes in soil properties over 3 years. Biochar extracted from fresh dung and from the soil to a depth of 40 cm was characterised. A preliminary financial analysis of the costs and benefits of this integrated approach was also undertaken. The preliminary investigation results suggested that this strategy was effective in improving soil properties and increasing returns to the farmer. It was also concluded that the biochar adsorbed nutrients from the cow＇s gut and from the dung. Dung beetles could transport this nutrient-rich biochar into the soil profile. There was little evidence that the recalcitrant component of the biochar was reduced through reactions inside the gut or on/in the soil. Further research is required to quantify the long-term impact of integrating biochar and dung beetles into the rearing of cows.

关键词： animal husbandry biochar C sequestration dung beetles financial benefit pasture

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