Magnetochemistry最新文献_第2页

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}

引用次数: 0

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}

引用次数: 0

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

引用次数: 0

Synthesis and Characterization of Hematite, Magnetite and Maghemite Supported on Silica Gel 硅胶支撑的赤铁矿、磁铁矿和磁铁矿的合成与表征

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-11-15 DOI: 10.3390/magnetochemistry9110228

P. A. Chernavskiy, A. Novakova, G. V. Pankina, D. A. Pankratov, S. I. Panfilov, G. A. Petrovskaya

引用次数: 0

Electrophoretic Deposition of One- and Two-Layer Compacts of Holmium and Yttrium Oxide Nanopowders for Magneto-Optical Ceramics Fabrication 电泳沉积用于制造磁光陶瓷的单层和双层氧化钬和氧化钇纳米粉体复合物

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-11-15 DOI: 10.3390/magnetochemistry9110227

E. Kalinina, Nataliya D. Kundikova, Dmitrii K. Kuznetsov, Maxim G. Ivanov

{"title":"Electrophoretic Deposition of One- and Two-Layer Compacts of Holmium and Yttrium Oxide Nanopowders for Magneto-Optical Ceramics Fabrication","authors":"E. Kalinina, Nataliya D. Kundikova, Dmitrii K. Kuznetsov, Maxim G. Ivanov","doi":"10.3390/magnetochemistry9110227","DOIUrl":"https://doi.org/10.3390/magnetochemistry9110227","url":null,"abstract":"In this work, the possibility of fabricating composite magneto-optical ceramics by electrophoretic deposition (EPD) of nanopowders and high-temperature vacuum sintering of the compacts was investigated. Holmium oxide was chosen as a magneto-optical material for the study because of its transparency in the mid-IR range. Nanopowders of magneto-optical (Ho0.95La0.05)2O3 (HoLa) material were made by self-propagating high-temperature synthesis. Nanopowders of (Y0.9La0.1)2O3 (YLa) were made by laser synthesis for an inactive matrix. The process of formation of one- and two-layer compacts by EPD of the nanopowders from alcohol suspensions was studied in detail. Acetylacetone was shown to be a good dispersant to obtain alcohol suspensions of the nanopowders, characterized by high zeta potential values (+29–+80 mV), and to carry out a stable EPD process. One-layer compacts were made from the HoLa and YLa nanopowders with a density of 30–43%. It was found out that the introduction of polyvinyl butyral (PVB) into the suspension leads to a decrease in the mass and thickness of the green bodies deposited, but does not significantly affect their density. The possibility of making two-layer (YLa/HoLa) compacts with a thickness of up to 2.6 mm and a density of up to 46% was demonstrated. Sintering such compacts in a vacuum at a temperature of 1750 °C for 10 h leads to the formation of ceramics with a homogeneous boundary between the YLa/HoLa layers and a thickness of the interdiffused ion layer of about 30 μm.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"4 3","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139272769","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

Spin Symmetry in Polynuclear Exchange-Coupled Clusters 多核交换耦合团簇中的自旋对称性

4区化学

Magnetochemistry Pub Date : 2023-11-06 DOI: 10.3390/magnetochemistry9110226

Roman Boča, Cyril Rajnák, Ján Titiš

引用次数: 0

Novel Tetranuclear Heterometallic Mn3Ni and Mononuclear Ni Complexes with an ONO Schiff Base Ligand: Synthesis, Crystal Structures, and Magnetic Properties 带有ONO席夫碱配体的新型四核异金属Mn3Ni和单核Ni配合物:合成、晶体结构和磁性能

4区化学

Magnetochemistry Pub Date : 2023-11-03 DOI: 10.3390/magnetochemistry9110225

Masato Fukuda, Ken Eguchi, Kazuma Matsumoto, Ko Yoneda, Yasunori Yamada, Haruka Yoshino, Yuki Imamura, Naoya Yamamoto, Masaaki Ohba, Masayuki Koikawa

引用次数: 0

Jahn–Teller Magnets 雅恩平板磁铁

4区化学

Magnetochemistry Pub Date : 2023-11-02 DOI: 10.3390/magnetochemistry9110224

Alexander Moskvin

{"title":"Jahn–Teller Magnets","authors":"Alexander Moskvin","doi":"10.3390/magnetochemistry9110224","DOIUrl":"https://doi.org/10.3390/magnetochemistry9110224","url":null,"abstract":"A wide class of materials with different crystal and electronic structures including quasi-2D unconventional superconductors, such as cuprates, nickelates, ferropnictides/chalcogenides, ruthenate Sr2RuO4, and 3D systems, such as manganites RMnO3, ferrates (CaSr)FeO3, nickelates RNiO3, silver oxide AgO, are based on Jahn–Teller 3d and 4d ions. These unusual materials, called Jahn–Teller (JT) magnets, are characterized by an extremely rich variety of phase states, spanning from non-magnetic and magnetic insulators to unusual metallic and superconducting states. The unconventional properties of JT magnets can be attributed to the instability of their highly symmetric Jahn–Teller “progenitors” with the ground orbital E-state with repect to charge transfer, anti-Jahn–Teller d-d disproportionation, and the formation of a system of effective local composite spin–singlet or spin–triplet, electronic, or hole S-type bosons moving in a non-magnetic or magnetic lattice. We consider specific features of the anti-JT-disproportionation reaction, properties of the electron–hole dimers, possible phase states and effective Hamiltonians for single- and two-band JT magnets, concluding with a short overview of physical properties for actual JT magnets.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135935301","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