Magnetochemistry最新文献

Preparation and Optimization of the Adsorbent for Phosphorus Removal Using the Response Surface Method 利用响应面法制备和优化除磷吸附剂

IF 2.7 4区化学

Magnetochemistry Pub Date : 2024-01-09 DOI: 10.3390/magnetochemistry10010005

Zhanmei Zhang, Zuqin Zou, Xiaoyu Ren, Yunxuan Huang, Yang Deng, Huaili Zheng

{"title":"Preparation and Optimization of the Adsorbent for Phosphorus Removal Using the Response Surface Method","authors":"Zhanmei Zhang, Zuqin Zou, Xiaoyu Ren, Yunxuan Huang, Yang Deng, Huaili Zheng","doi":"10.3390/magnetochemistry10010005","DOIUrl":"https://doi.org/10.3390/magnetochemistry10010005","url":null,"abstract":"A diatomaceous earth (DE)-based adsorbent DE-Ce was prepared and optimized to remove phosphorus from wastewater. DE was modified through purification–cerium loading, improving its phosphorus adsorption capacity and recycling ability. The preparation conditions were optimized using the Box–Behnken design, and the response surface method was employed to analyze the effects of roasting temperature, cerium concentration, and HCl concentration on the preparation of DE-Ce. Scanning electron microscopy, X-ray fluorescence spectrometry, and X-ray photoelectron spectroscopy were used for characterization, with results indicating that HCl washing can effectively remove impurities. Cerium was mainly loaded onto DE in the form of Ce(OH)3, and pore size and capacity increased following cerium loading, with the formation of a macroporous structure. The obtained DE-Ce adsorbent removed 98.30% phosphorous, with the removal process following the secondary kinetic and Langmuir models. According to material characterization and model analysis results, the phosphorus removal mechanism primarily involves electrostatic adsorption, ligand exchange, and precipitation. Overall, the findings indicate that cerium modification can effectively improve the adsorption capacity of DE.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts 磁感应局部结构和体积分数对带有铁流体液滴嵌入件的弹性体样品电磁特性的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2024-01-02 DOI: 10.3390/magnetochemistry10010004

C. Marin, I. Malaescu

{"title":"The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts","authors":"C. Marin, I. Malaescu","doi":"10.3390/magnetochemistry10010004","DOIUrl":"https://doi.org/10.3390/magnetochemistry10010004","url":null,"abstract":"The magnetic permeability (μ), dielectric permittivity (ε) and electrical conductivity (σ) of six elastomer samples obtained by mixing silicone rubber (RTV-530) with a kerosene-based ferrofluid in different volume fractions (φ), 1.31%, 2.59% and 3.84%, were determined using complex impedance measurements over a frequency range of 500 Hz–2 MHz. Three samples (A0, B0 and C0) were manufactured in the absence of a magnetic field, and the other three samples (Ah, Bh and Ch) were manufactured in the presence of a magnetic field, H = 43 kA/m. The component μ″ of the complex effective magnetic permeability of all samples presents a maximum at a frequency, fmax, that moves to higher values by increasing φ, with this maximum being attributed to Brownian relaxation processes. The conductivity spectrum, σ (f), of all samples follows the Jonscher universal law, which allows for both the determination of the static conductivity, σDC, and the barrier energy of the electrical conduction process, Wm. For the same φ, Wm is lower, and σDC is higher in the samples Ah, Bh and Ch than in the samples A0, B0 and C0. The performed study is useful in manufacturing elastomers with predetermined properties and for possible applications such as magneto-dielectric flexible electronic devices, which can be controlled by the volume fraction of particles or by an external magnetic field.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"122 3","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139391467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction: Li et al. Dry Friction Performances of MoNx Coatings Deposited by High–Power Pulsed Magnetron Sputtering. Magnetochemistry 2023, 9, 60 更正：高功率脉冲磁控溅射沉积的 MoNx 涂层的干摩擦性能。磁化学，2023，9，60

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-12-29 DOI: 10.3390/magnetochemistry10010003

Fuqiang Li, Wei Dai, Qimin Wang, Haiqing Li, Zhengtao Wu

引用次数: 0

The Influence of Viscosity on Heat Dissipation under Conditions of the High-Frequency Oscillating Magnetic Field 高频振荡磁场条件下粘度对散热的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-12-24 DOI: 10.3390/magnetochemistry10010002

M. Molčan, A. Skumiel, Jana Tóthová, K. Paulovičová, P. Kopčanský, M. Timko

{"title":"The Influence of Viscosity on Heat Dissipation under Conditions of the High-Frequency Oscillating Magnetic Field","authors":"M. Molčan, A. Skumiel, Jana Tóthová, K. Paulovičová, P. Kopčanský, M. Timko","doi":"10.3390/magnetochemistry10010002","DOIUrl":"https://doi.org/10.3390/magnetochemistry10010002","url":null,"abstract":"High-frequency components such as microprocessors, transistors, antennas, voltage-controlled oscillators, and many others generate a large amount of heat. In the absence of satisfactory cooling, these components may suffer damage or even destruction. Therefore, it is important to find effective ways to cool these components. A possible solution is to use oil-based magnetic fluids. Magnetic fluids contain magnetic particles dispersed in oil, and their properties, including viscosity, affect their cooling capabilities. Viscosity can be changed by adding various additives or by adjusting the concentration of magnetic particles. The advantage of using oil-based magnetic fluids for cooling is that they allow for precise dosing and control of the amount of fluid applied to the component, reducing thermal losses and increasing cooling efficiency. In addition, oil-based magnetic fluids can also act as a dielectric, reducing electrical noise and increasing electromagnetic compatibility with the components. Analyzing the heating rate of magnetic fluids consisting of mineral oils in an alternating magnetic field with a frequency of 500 kHz, we have shown the capability of controlling thermal losses by adjusting the viscosity of the carrier liquid.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"90 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139159916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functional Molecular Materials Insights 功能分子材料透视

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-12-20 DOI: 10.3390/magnetochemistry10010001

Laura C. J. Pereira, D. Belo

引用次数: 0

Effect of Electrode–Normal Magnetic Field on the Motion of Hydrogen Bubbles 电极法向磁场对氢气泡运动的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-12-18 DOI: 10.3390/magnetochemistry9120233

Yen-Ju Chen, Yan-Hom Li, Ching-Yao Chen

{"title":"Effect of Electrode–Normal Magnetic Field on the Motion of Hydrogen Bubbles","authors":"Yen-Ju Chen, Yan-Hom Li, Ching-Yao Chen","doi":"10.3390/magnetochemistry9120233","DOIUrl":"https://doi.org/10.3390/magnetochemistry9120233","url":null,"abstract":"In comparison to alternative methods for hydrogen production, water electrolysis stands out as the optimal means for obtaining ultra-pure hydrogen. However, its widespread adoption is significantly hampered by its low energy efficiency. It has been established that the introduction of an external magnetic field can mitigate energy consumption, consequently enhancing electrolysis efficiency. While much of the research has revealed that an electrode–parallel magnetic field plays a crucial role in enhancing the bubble detachment process, there has been limited exploration of the effect of electrode–normal magnetic fields. In this work, we compare the water electrolysis efficiency of a circular electrode subjected to electrode–normal magnetic field resulting in a magnet edge effect and electrode edge effect by varying the sizes of the magnet and electrode. The findings indicate that a rotational flow caused by the Lorentz force facilitates the detachment of the hydrogen from the electrode surface. However, the rotation direction of hydrogen gas bubbles generated by the magnet edge effect is opposite to that of electrode edge effect. Furthermore, the magnet edge effect has more significant influence on the hydrogen bubbles’ locomotion than the electrode edge effect. With an electrode gap of 30 mm, employing the magnet edge effect generated by a single magnet leads to an average of 4.9% increase in current density. On the other hand, the multiple magnet effects created by multiple small magnets under the electrode can further result in an average 6.6% increase in current density. Nevertheless, at an electrode spacing of 50 mm, neither the magnet edge effect nor the electrode edge effect demonstrates a notable enhancement in conductivity. In reality, the electrode edge effect even leads to a reduction in conductivity.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"74 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Topology Parameters on Physical–Mechanical Properties of Magnetic PLA 3D-Printed Structures 拓扑参数对磁性聚乳酸三维打印结构物理机械特性的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-12-18 DOI: 10.3390/magnetochemistry9120232

L. Zárybnická, M. Pagáč, R. Ševčík, Jaroslav Pokorný, Martin Marek

{"title":"Effect of Topology Parameters on Physical–Mechanical Properties of Magnetic PLA 3D-Printed Structures","authors":"L. Zárybnická, M. Pagáč, R. Ševčík, Jaroslav Pokorný, Martin Marek","doi":"10.3390/magnetochemistry9120232","DOIUrl":"https://doi.org/10.3390/magnetochemistry9120232","url":null,"abstract":"This work aims to characterize 3D-printed structures composed of a thermoplastic material (polylactic acid (PLA)) containing a combination of magnetic particles composed of iron(III) oxide (hematite) and iron(II)–iron (III) oxide (magnetite) with various infill densities and print orientations in regard to their possible processing by Fused Filament Fabrication additive technology. The correct processing temperatures have been determined using thermal analysis, and the paramagnetic and mechanical properties of the samples have been tested. The relative permeability has been identified to be strongly dependent on the topology parameters of the tested samples. The results of the inductance values for the samples without magnetic additives (infill densities 50% and 100%) have been detected to be comparable; nonetheless, the magnetic samples with 100% infill density has been found to be about 50% higher. A similar trend has been observed in the case of the values of the relative permeability, where the magnetic samples with 100% infill density have been measured as having an about 40% increased relative permeability in the comparison with the samples without magnetic additives (infill densities 20–100%). Finite Element Modelling (FEM) simulations have been applied to determine the magnetic field distributions and, moreover, to calculate the holding forces of all the printed samples. The maximum value of the holding force for the minimum distance of the plastic plate has been found to reach a value of almost 300 N (magnetic sample with 100% infill density). The obtained comprehensive characterization of the printed samples may be utilized for designing and tuning the desired properties of the samples needed in various industrial applications.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138964376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Dzyaloshinsky–Moriya Interaction Induced Anomalous g Behavior of Sr2IrO4 Probed by Electron Spin Resonance 电子自旋共振探测 Sr2IrO4 的 Dzyaloshinsky-Moriya 相互作用诱导的反常 g 行为

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-11-19 DOI: 10.3390/magnetochemistry9110231

Kai Wang, Liqin Yan, Youguo Shi, Baogen Shen, Lunhua He, Fangwei Wang, Jun Lu, Tongyun Zhao, Zunming Lu

引用次数: 0

Exploring Crystal Structure, Hyperfine Parameters, and Magnetocaloric Effect in Iron-Rich Intermetallic Alloy with ThMn12-Type Structure: A Comprehensive Investigation Using Experimental and DFT Calculation 探索具有 ThMn12 型结构的富铁金属间合金的晶体结构、超细参数和磁ocaloric 效应：利用实验和 DFT 计算的综合研究

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-11-18 DOI: 10.3390/magnetochemistry9110230

J. Horcheni, H. Jaballah, Essebti Dhahri, L. Bessais

{"title":"Exploring Crystal Structure, Hyperfine Parameters, and Magnetocaloric Effect in Iron-Rich Intermetallic Alloy with ThMn12-Type Structure: A Comprehensive Investigation Using Experimental and DFT Calculation","authors":"J. Horcheni, H. Jaballah, Essebti Dhahri, L. Bessais","doi":"10.3390/magnetochemistry9110230","DOIUrl":"https://doi.org/10.3390/magnetochemistry9110230","url":null,"abstract":"In this study, we give a thorough evaluation of the structural, magnetic, and magnetocaloric properties in iron-rich PrFe11Ti intermetallic alloy with ThMn12-type structure using a combination of experimental and theoretical analysis. X-ray diffraction coupled with Rietveld refinement was used to characterize the structure, which revealed a unique tetragonal crystal structure with I4/mmm space group. The 8i site was identified as the preferred site for the Ti atom. This finding was confirmed by various techniques, including XRD, DFT, and Mössbauer spectrometry. Magnetic properties were studied through intrinsic magnetic measurements and magnetocaloric effect analysis. Mössbauer spectroscopy was employed to probe the local magnetic environment and for further characterization of the material’s magnetic properties. The experimental results were complemented by theoretical calculations based on density functional theory (DFT). A promising magnetocaloric effect is observed, with a significant maximum magnetic entropy (−ΔSMmax = 2.5 J·kg−1·K−1) and a relative cooling power about 70 J·kg−1 under low magnetic field change μ0ΔH = 1.5 T. Overall, our results provide a deeper understanding of the structural and magnetic properties of the material under study and demonstrate the effectiveness of the combined experimental and theoretical approach in the investigation of complex materials. The insights gained from this study could have implications for the development of advanced magnetic materials with enhanced properties for potential magnetic applications.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"82 978 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139262338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Honey-like Odor Meets Single-Ion Magnet: Synthesis, Crystal Structure, and Magnetism of Cobalt(II) Complex with Aromatic Trans-Cinnamic Acid 类似蜂蜜的气味与单离子磁体：钴（II）与芳香族反肉桂酸配合物的合成、晶体结构和磁性

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-11-16 DOI: 10.3390/magnetochemistry9110229

Petr Halaš, Ivan Nemec, R. Herchel

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