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Influence of cerium ions on structure-dependent magnetic properties of Ba-sr M-type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar sunil M.Patange P.M.Dighe sher singh Meena Abdullah GAl-sehemi Mehboobali Pannipara santosh s.jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia solid state Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the M-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPs data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FEsEM profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.s.M,and Mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-sr hexaferrite Ce^(3+)substitution XPs saturation magnetization Coercivity M?ssbauer spectroscopy

Rare earth-doped mixed Ni-Cu-Zn ferrites as an effective photocatalytic agent for active degradation of Rhodamine B dye

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Journal of Rare Earths 2024年第3期42卷 488-496,I0003页

作者： swapnil A.jadhav sandeep B.somvanshi sudarshan s.Gawali Kranti Zakde K.M.jadhav Department of Physics Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad431004MaharashtraIndia school of Materials Engineering Purdue UniversityWest Lafayette 47906USA University Department of Basic and Applied sciences MGM UniversityAurangabad431003MaharashtraIndia

In this study, a series of Gd^(3+)-doped mixed Ni-Cu-Zn ferrites with composition of Zn_(0.5)Ni_(0.3)Cu_(0.2)Fe_(2-x)Gd_(x)O_(4)(x = 0, 0.025, 0.05, 0.075, 0.1) was prepared using self-ignition sol-gel method. The prepared nanoparticles with an average size ranging from 22 to 26 nm show a single-phase cubic structure belonging to the spinel matrix. A rise in the Gd^(3+)concentration leads to an increase in crystallite size and lattice parameter. In Fourier transform infrared spectra, two main absorption bands belonging to the spinel structure are observed. The high-frequency bands(v_(1)) represent the tetrahedral complex, while the lowfrequency bands(v_(2)) signify the octahedral complex. The optical bandgap of the nanoferrites is found within the range of 2.91 to 2.41 eV, depending on their size. The magnetic characteristics of the material,such as saturation magnetization and coercivity are significantly altered with the concentration of Gd^(3+)in the solution. Using Rhodamine B(RhB) as a model organic pollutant, an in-depth investigation of the photocatalytic activity of the compounds was carried out. The present outcomes show that adding an adequate amount of Gd^(3+)significantly enhances the number of hydroxyl radicals produced by the ferrite,in turn, increasing the photocatalytic activity of the material. Mechanism elucidated by scavenger studies reveals that ·OH and holes are the primary reactive radicals responsible for the degradation *** photocatalysts show an insignificant performance loss in five consecutive cycles. Thus, it is concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater.

关键词： Gd^(3+)substitution spinel ferrite structural properties Magnetic properties Photocatalysis Rare earths

均相和非均相催化微藻脂质提取和酯交换制备生物燃料的研究进展

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Chinese Journal of Catalysis 2024年第4期59卷 97-117页

作者： Vinoth Kumar Ponnumsamy Hussein E.Al-Hazmi sutha shobana Jeyaprakash Dharmaraja Dipak ashok jadhav Rajesh Banu J Grzegorz Piechota Bartłomiej Igliński Vinod Kumar Amit Bhatnagar Kyu-Jung Chae Gopalakrishnan Kumar 高雄医科大学药物与应用化学系环境医学研究中心中国台湾高雄高雄医科大学医学研究部中国台湾高雄格但斯克理工大学土木与环境工程学院波兰纳鲁特维察格但斯克范朗大学工程与技术学院建筑绿色技术与可持续发展研究组越南胡志明市工程技术学院科学与人文系化学部印度泰米尔纳德邦韩国海洋大学海洋科学与工程学院环境工程系韩国釜山泰米尔纳德邦中央大学生命科学系印度泰米尔纳德邦 GPCHEM沼气研究与分析实验室波兰尼古拉斯哥白尼大学化学系波兰克兰菲尔德大学水与能源学院英国拉彭兰塔工业大学工程科学学院分离科学系芬兰韩国海洋大学海洋可再生能源工程专业韩国釜山延世大学土木与环境工程学院韩国首尔斯塔万格大学科学技术学院化学、生物科学与环境工程研究所挪威斯塔万格

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化... 详细信息

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化技术从微藻中提取脂质,并通过酯交换反应可以将其转化为脂肪酸甲酯,是生产绿色生物燃料的有效途径.这一过程涉及游离脂肪酸、磷脂和甘油三酯的提取,并且生产过程能耗低,成为满足日益增长的能源需求的一种理想解决方案.本文综述了微藻脂质提取和酯交换制备生物燃料的相关研究进展.首先,介绍了微藻脂质的提取方法,包括溶剂提取法、索氏提取法、布利格和戴耶法、超临界二氧化碳提取以及离子液体溶剂法等,并分析了各方法的优缺点.随后,重点阐述了酯交换技术在微藻脂质转化中的应用,包括酸碱催化、酶催化以及原位酯交换反应等,并探讨了这些技术的反应机理、催化剂选择、反应器设计以及生物油生产工艺等方面的研究进展.通过综述上述研究进展,为微藻脂质的生产和应用提供了理论指导.研究表明,通过优化催化剂种类、反应条件以及提取方法,可以有效提高微藻脂质的转化效率和生物油品质.同时,本文也指出了当前微藻脂质生产中面临的挑战,如微藻栽培和生长条件优化、高效转化技术的开发等.随着可持续能源日益受到重视,微藻脂质作为一种可再生能源具有巨大的发展潜力.未来研究应进一步关注微藻的规模化栽培、生长条件优化以及高效转化技术的研发,以提高微藻脂质的产量和品质.同时,应进一步推动和实现微藻生物燃料的实际应用,从而为应对气候变化和能源危机提供有效的解决方案.

关键词：微藻脂质提取酯交换催化酶催化原位技术

Direct-seeded Rice: Genetic Improvement of Game-Changing Traits for Better Adaption

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Rice science 2024年第4期31卷 417-433页

作者： Priyanka NEGI Jagadish RANE Rajendra sadashiv WAGH Tukaram Jayaram BHOR Dipti Digambar GODsE Priyanka jadhav C.ANILKUMAR Dasari sREEKANTH K.sAMMI REDDY sharad Ramrao GADAKH K.M.BORAIH C.B.HARIsHA P.s.BAsAVARAJ Indian Council of Agricultural Research(ICAR)-National Institute of Abiotic stress Management Baramati 413115India Mahatma Phule Krishi Vidyapeeth Rahuri 413722India ICAR-Central Institute for Arid Horticulture Bikaner 334006India ICAR-National Rice Research Institute Cuttack 753006India ICAR-Directorate of Weed Research Jabalpur 482004India Dr.Panjabrao Deshmukh Krishi Vidyapeeth Akola 444104India

The sustainability of rice production continues to be a subject of uncertainty and inquiry attributed to shifts in climatic conditions. In light of the impending climate change crisis and the high labor and water costs accompanying it, direct-seeded rice(DsR) is unquestionably one of the most practical solutions. Despite its resource and climate-friendly advantages, early maturing rice faces weed competitiveness and seedling establishment challenges. Resolving these issues is crucial for promoting its wider adoption among farmers, presenting it as a more effective sustainable rice cultivation method globally. Diverse traditional and contemporary breeding methods are employed to mitigate the limitations of the DsR approach, leveraging advanced techniques such as speed breeding and genome editing. Focusing on key traits like mesocotyl length elongation, early seedling vigor, root system architecture, and weed competitiveness holds promise for transformative improvements in DsR adaptation at a broader scale within farming communities. This review aims to summarize how these features contribute to increased crop production in DsR conditions and explore the research efforts focusing on enhancing DsR adaptation through these traits. Emphasizing the pivotal role of these game-changing traits in DsR adaptation, our analysis sheds light on their potential transformative impact and offers valuable insights for advancing DsR practices.

关键词： climate change direct-seeded rice aerobic rice early vigor trait

Computer-aided diabetic retinopathy diagnostic model using optimal thresholding merged with neural network

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International Journal of Intelligent Computing and Cybernetics 2020年第3期13卷 283-310页

作者： Ambaji s.jadhav Pushpa B.Patil sunil Biradar Department of Electrical and Electronics B.L.D.E.A’s V.P.Dr.P.G.Halakatti College of Engineering and Technology(Affiliated to Visvesvaraya Technological University)VijayapurIndia Department of Ophthalmology Shri B.M.Patil Medical College and Research Center(Deemed to be University)VijayapurIndia

Purpose-Diabetic retinopathy(DR)is a central root of blindness all over the *** DR is tough to diagnose in starting stages,and the detection procedure might be time-consuming even for qualified ***,intelligent disease detection techniques are extremely acceptable for progress analysis and recognition of various ***,a computer-aided diagnosis scheme based on intelligent learning approaches is intended to propose for diagnosing DR effectively using a benchmark ***/methodology/approach-The proposed DR diagnostic procedure involves four main steps:(1)image pre-processing,(2)blood vessel segmentation,(3)feature extraction,and(4)***,the retinal fundus image is taken for pre-processing with the help of Contrast Limited Adaptive Histogram Equalization(CLAHE)and average *** the next step,the blood vessel segmentation is carried out using a segmentation process with optimized gray-level *** the blood vessels are extracted,feature extraction is done,using Local Binary Pattern(LBP),Texture Energy Measurement(TEM based on Laws of Texture Energy),and two entropy computations-shanon’s entropy,and Kapur’s *** collected features are subjected to a classifier called Neural Network(NN)with an optimized training *** the gray-level thresholding and NN is enhanced by the Modified Levy Updated-Dragonfly Algorithm(MLU-DA),which operates to maximize the segmentation accuracy and to reduce the error difference between the predicted and actual outcomes of the ***,this classification error can correctly prove the efficiency of the proposed DR detection ***-The overall accuracy of the proposed MLU-DA was 16.6%superior to conventional classifiers,and the precision of the developed MLU-DA was 22%better than LM-NN,16.6%better than PsO-NN,GWO-NN,and ***,it is concluded that the implemented MLU-DA outperformed state-of-the-art algorithms in detecting ***

关键词： Diabetic retinopathy detection Gray-level thresholding Optimal trained neural network Dragon fly algorithm Levy update Performance metrics

Role of composition and grain size in controlling the structure sensitive magnetic properties of sm substituted nanocrystalline Co-Zn ferrites

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Journal of Rare Earths 2020年第10期38卷 1069-1075,I0002页

作者： Anil B.Mugutkar shyam K.Gore Umakant B.Tumberphale Vijaykumar V.jadhav Rajaram s.Mane sunil M.Patange sagar E.shirsath santosh s.jadhav Bahirji smarak Mahavidyalaya Basmath431512MaharashtraIndia Microwave Research Laboratory N.E.S.Science CollegeNanded431601MaharashtraIndia Dnyanopasak shikshan Mandal's Arts Commerce and Science CollegeJintur431509MaharashtraIndia Guangdong Technion Israel Institute of TechnologyShantou 515006China Department of Physics Shivaji MahavidyalayaUdgir-413517MaharashtraIndia school of Physical sciences Swami Ramanand Teerth Marathwada UniversityNanded431606MaharashtraIndia shri Krishna Mahavidyalaya Gunjoti413613MaharashtraIndia school of Materials science and Engineering University of New South WalesSydney2052NSWAustralia

The nanocrystalline samarium substituted Co-Zn ferrites with chemical formula Co0.7Zn0.3smyFe2-yO4(where y=0,0.01,0.02,0.03,0.04) were synthesized by sol-gel autocombustion *** analysis of Xray diffractograms(XRD) reveals the formation of cubic spinel *** planes indexed from XRD analyses were confirmed in the selected area electron diffraction(sAED) image of the *** nature of the particles in the ferrite samples was confirmed by *** morphology was analyzed by scanning electron microscopy(sEM).Magnetic measurements show an increase in the magnetization for x ≤*** decrease in magnetization due to spin canting is observed for x=*** coercivity depends on sm3+doping concentration,grain size and saturation *** complex permeability of the ferrites was analyzed as the function of frequency and sm3+composition(y).The real part of complex permeability varies linearly with the grain size.

关键词： Nanocrystalline ferrites Rietveld refinement HRTEM Magnetization Coercivity Permeability

Development and Validation of UV spectrophotometric Method to study stress Degradation Behaviour of Rizatriptan Benzoate

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光谱学与光谱分析 2015年第1期35卷 137-140页

作者： Kempwade Amolkumar Taranalli ashok jadhav Kiran KLE University's College of Phyarmacy Nehrunagar Belgaum 590010 India

Rizatriptan benzoate is a 5HT 1B/1Dreceptor agonist which is prescribed for the treatment of *** the present study new,simple,specific ultraviolet spectrophotometric method for rizatriptan benzoate was developed and *** degradation studies were carried out in acidic,alkaline and neutral pH *** absorbance maxima peak was found to be 224 nm and linearity was observed in the concentration range of 0.5~2.5μg·mL-1 with regression coefficient value of 0.998 *** method was validated and found to be *** percent recovery for rizatriptan benzoate was found to be 98.576±*** bulk drug was found to be stable in neutral and acidic pH conditions but got degraded in 1N NaOH solution.

关键词： Rizatriptan benzoate UV spectroscopy stress degradation Validation

Effect of Cation Proportion on the structural and Magnetic Properties of Ni-Zn Ferrites Nano-size Particles Prepared By Co-Precipitation Technique

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Chinese Journal of Chemical Physics 2008年第4期21卷 381-386页

作者： santosh s. jadhav sagar E. shirsath B. G. Toksha s. J. shukla K. M. jadhav DsM College of Arts Commerce and science Jintur Dist. Parbhani 431509 India Department of Physics Dr. Babasaheb Ambedkar Marathwada University Aurangabad 431005 India Postgraduate and Research Centre of Physics Department of Physics Deogiri College Aurangabad India

Ferrites having general formula Ni1-xZnxFe2O4 with x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 were prepared by wet chemical co-precipitation method. The structural and magnetic properties were studied by means of X-ray diffraction, magnetization, and AC susceptibility measurements. The X-ray analysis confirmed the single-phase formation of the samples. The lattice parameter obtained from XRD data was found to increase with Zn content x. The cation distribution was studied by X-ray intensity ratio calculations. Magnetization results exhibit collinear ferrimagnetic structure for x≤0.4, and which changes to non-collinear for x〉0.4. Curie temperature TC obtained from AC susceptibility data decreases with increasing x.

关键词： Ferrites Magnetization Yafet-Kittel angle Curie temperature

Lanthanum(Ⅲ) sorption studies on poly[dibenzo-18-crown-6] and its separation from uranium(Ⅵ) and thorium(Ⅳ) in L-valine medium

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Journal of Rare Earths 2009年第5期27卷 825-829页

作者： s.R.sabale D.V.jadhav B.s.Mohite Analytical and Environmental Research Lab Department of ChemistryShivaji University

The sorption study of La(Ⅲ) was carried out on poly[dibenzo-18-crown-6] and L-valine medium. The quantitative adsorption of La(Ⅲ) was found at 1×10-2 to 1×10-5 mol/L L-valine. The various eluting agents were found efficient eluents for La(Ⅲ). The capacity of crown polymer for La(Ⅲ) was found to be 0.43 ±0.01 mmol/g. The tolerance limit of various cations and anions for La(Ⅲ) was determined. La(Ⅲ) was quantitatively separated from other metal ions in binary as well as multicomponent mixtures. The study was extended to sequential separation of La(Ⅲ), U(VI) and Th(IV). The good separation yields were obtained and had good reproducibility (±2%). The method incorporated the determination of La(Ⅲ) in real sample. The method was simple, rapid and selective.

关键词： La(Ⅲ) L-valine poly[dibenzo-18-crown-6] sorption separation rare earths