Magnetochemistry最新文献_第9页

Reduction of Oxidizable Pollutants in Waste Water from the Wadi El Bey River Basin Using Magnetic Nanoparticles as Removal Agents 磁性纳米颗粒去除Wadi El Bey河流域废水中可氧化性污染物的研究

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-14 DOI: 10.3390/magnetochemistry9060157

H. Tlili, Anis Elaoud, N. Asses, K. Horchani-Naifer, Mounir Ferhi, G. Goya

引用次数: 0

Spin Frustrated Pyrazolato Triangular CuII Complex: Structure and Magnetic Properties, an Overview 自旋受挫Pyrazolato三角形CuII配合物:结构和磁性，综述

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-11 DOI: 10.3390/magnetochemistry9060155

Walter Cañón-Mancisidor, P. Hermosilla‐Ibáñez, E. Spodine, V. Paredes-García, C. Gómez‐García, D. Venegas‐Yazigi

{"title":"Spin Frustrated Pyrazolato Triangular CuII Complex: Structure and Magnetic Properties, an Overview","authors":"Walter Cañón-Mancisidor, P. Hermosilla‐Ibáñez, E. Spodine, V. Paredes-García, C. Gómez‐García, D. Venegas‐Yazigi","doi":"10.3390/magnetochemistry9060155","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060155","url":null,"abstract":"The synthesis and structural characterization of a new triangular Cu3–μ3OH pyrazolato complex of formula, [Cu3(μ3−OH)(pz)3(Hpz)3][BF4]2 (1−Cu3), Hpz = pyrazole, is presented. The triangular unit forms a quasi-isosceles triangle with Cu–Cu distances of 3.3739(9), 3.3571(9), and 3.370(1) Å. This complex is isostructural to the hexanuclear complex [Cu3(μ3−OH)(pz)3(Hpz)3](ClO4)2]2 (QOPJIP). A comparative structural analysis with other reported triangular Cu3–μ3OH pyrazolato complexes has been carried out, showing that, depending on the pyrazolato derivative, an auxiliary ligand or counter-anion can affect the nuclearity and/or the dimensionality of the system. The magnetic properties of 1−Cu3 are analyzed using experimental data and DFT calculation. A detailed analysis was performed on the magnetic properties, comparing experimental and theoretical data of other molecular triangular Cu3–μ3OH complexes, showing that the displacement of the μ3−OH− from the Cu3 plane, together with the type of organic ligands, influences the nature of the magnetic exchange interaction between the spin-carrier centers, since it affects the overlap of the magnetic orbitals involved in the exchange pathways. Finally, a detailed comparison of the magnetic properties of 1−Cu3 and QOPJIP was carried out, which allowed us to understand the differences in their magnetic properties.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45676253","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

Magneto-Structural Analysis of Hydroxido-Bridged CuII2 Complexes: Density Functional Theory and Other Treatments 羟基桥接CuII2配合物的磁结构分析:密度泛函理论和其他处理

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-10 DOI: 10.3390/magnetochemistry9060154

Debpriyo Goswami, S. Patra, D. Ray

引用次数: 0

Band Structure Evolution during Reversible Interconversion between Dirac and Standard Fermions in Organic Charge-Transfer Salts 有机电荷转移盐中狄拉克与标准费米子可逆互转换过程中的能带结构演化

4区化学

Magnetochemistry Pub Date : 2023-06-09 DOI: 10.3390/magnetochemistry9060153

Ryuhei Oka, Keishi Ohara, Kensuke Konishi, Ichiro Yamane, Toshihiro Shimada, Toshio Naito

{"title":"Band Structure Evolution during Reversible Interconversion between Dirac and Standard Fermions in Organic Charge-Transfer Salts","authors":"Ryuhei Oka, Keishi Ohara, Kensuke Konishi, Ichiro Yamane, Toshihiro Shimada, Toshio Naito","doi":"10.3390/magnetochemistry9060153","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060153","url":null,"abstract":"Materials containing Dirac fermions (DFs) have been actively researched because they often alter electrical and magnetic properties in an unprecedented manner. Although many studies have suggested the transformation between standard fermions (SFs) and DFs, the non-availability of appropriate samples has prevented the observation of the transformation process. We observed the interconversion process of DFs and SFs using organic charge-transfer (CT) salts. The samples are unique in that the constituents (the donor D and acceptor A species) are particularly close to each other in energy, leading to the temperature- and D-A-combination-sensitive CT interactions in the solid states. The three-dimensional weak D–A CT interactions in low-symmetry crystals induced the continuous reshaping of flat-bottomed bands into Dirac cones with decreasing temperature; this is a characteristic shape of bands that converts the behavior of SFs into that of DFs. Based on the first-principles band structures supported by the observed electronic properties, round-apex-Dirac-cone-like features appear and disappear with temperature variation. These band-structure snapshots are expected to add further detailed understanding to the related research fields.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135051034","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: 1

Driving a Molecular Spin-Peierls System into a Short Range Ordered State through Chemical Substitution 利用化学取代驱动分子自旋-佩尔斯体系进入短程有序态

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-08 DOI: 10.3390/magnetochemistry9060150

A. Berlie, I. Terry, M. Szablewski

引用次数: 0

Some Magnetic Properties and Magnetocaloric Effects in the High-Temperature Antiferromagnet YbCoC2 高温反铁磁体ybco_2的一些磁性能和磁热效应

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-08 DOI: 10.3390/magnetochemistry9060152

D. Salamatin, V. Krasnorussky, M. Magnitskaya, A. Semeno, A. Bokov, A. Velichkov, Z. Surowiec, Anatoly Vasilyevich Tsvyashchenko

引用次数: 0

The Adsorption Performance of Porous Activated Carbons Prepared from Iron (II) Precursors Precipitated on the Porous Carbon Matrix Thermolysis 多孔炭基体热分解沉淀铁(II)前驱体制备多孔活性炭的吸附性能

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-08 DOI: 10.3390/magnetochemistry9060151

A. Kalenskii, A. Ivanov, D.B. Sevostyanov, A. Zvekov, A. Krechetov

{"title":"The Adsorption Performance of Porous Activated Carbons Prepared from Iron (II) Precursors Precipitated on the Porous Carbon Matrix Thermolysis","authors":"A. Kalenskii, A. Ivanov, D.B. Sevostyanov, A. Zvekov, A. Krechetov","doi":"10.3390/magnetochemistry9060151","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060151","url":null,"abstract":"The creation of new compounds featuring high adsorption and catalytic performance with magnetic properties of the material is one of the important fields of magnetochemistry. The typical synthetic schemes of magnetic carbonaceous adsorbents are rather complicated due to the use of inert atmosphere and difficult wet methods of magnetite precipitation. The arising experimental issues prevent industrial production of magnetically activated carbons. In order to overcome these obstacles, we suggested a novel approach to porous carbons: magnetite composite synthesis based on iron (II) salt precipitation on porous carbon and subsequent thermolysis. We facilitated the process at the stage of the material washing. The synthetic route used is simple and can be applied industrially. The present paper is focused on the adsorption performance of a product prepared from commercial activated carbons BAU-A and AG-3. The porous structure was studied with low-temperature nitrogen adsorption that revealed surface area decreased by 26% in the case of BAU-A and 40% in the case of AG-3 with an increase in mesopore volume. Phenol and nitrobenzene adsorption from water solution was tested with magnetic carbon prepared from BAU-A. The adsorption isotherms obtained are described well using the Langmuir model. The limiting adsorption value in the case of magnetic porous carbon is lower than in the case of pristine carbon. The relative decrease in limiting adsorption value is close to the relative decrease in the specific surface area. The adsorption constant remains the same, showing that adsorption centers of phenol and nitrobenzene are the same for porous magnetic carbon and its activated carbon precursor. Thus, we showed in the present study that the magnetically activated carbons we developed almost retain the adsorption performance of their activated carbon precursors.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45109343","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

From Micro to Nano: Grinding Natural Magnetite Ore for Microalgae Harvesting 从微米到纳米：研磨天然磁铁矿用于采集微藻

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-05 DOI: 10.3390/magnetochemistry9060149

Michael Schobesberger, Simone Helmhagen, Stefan Mende, S. Berensmeier, P. Fraga-García

{"title":"From Micro to Nano: Grinding Natural Magnetite Ore for Microalgae Harvesting","authors":"Michael Schobesberger, Simone Helmhagen, Stefan Mende, S. Berensmeier, P. Fraga-García","doi":"10.3390/magnetochemistry9060149","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060149","url":null,"abstract":"Microalgae represent a promising feedstock for sustainable biomass and energy. The low cell concentration after cultivation, however, limits the current application fields. Magnetic microalgae harvesting is a recent approach to overcome the economic limitations of exploiting this natural resource. Accordingly, different particle types have been applied, mainly synthetically produced magnetic nanoparticles, though none on an industrial scale. Particle sizes between a few micrometers and a few nanometers have not been tested. We expected 200–500 nm to be advantageous for harvesting and as a compromise between the highly available surface and good separation properties. However, this intermediate magnetite particle size between the micro- and nano-scale cannot be reached via chemical synthesis. Therefore, we ground natural magnetite ore in a planetary ball mill and an agitator bead mill producing particles in the targeted size range. Applying ore particles ground from ~6 µm to 250 nm yields harvesting efficiencies comparable to synthetically produced nanoparticles (Ø ~ 10 nm), with only half the BET surface. Complete harvesting of saline microalgae Microchloropsis salina is possible with ground particles at alkaline pH. We demonstrate the feasibility of a harvesting process with natural, low-cost, easily separable, and readily available magnetite ore particles as a promising step towards exploiting valuable microalgal products in life sciences.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43404319","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

Nuclear Dipole Moments and Shielding Constants of Light Nuclei Measured in Magnetic Fields 磁场中测量的轻核偶极矩和屏蔽常数

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-06-02 DOI: 10.3390/magnetochemistry9060148

W. Makulski, Mateusz A. Słowiński, P. Garbacz

引用次数: 0

Research on the Surfactant-Assisted Synthesis of MnZn Ferrite Precursor Powders 表面活性剂辅助合成MnZn铁氧体前驱体粉末的研究

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-30 DOI: 10.3390/magnetochemistry9060146

Zhanyuan Xu, Wei Zhao, Jie-fu Liu, J. Fan

{"title":"Research on the Surfactant-Assisted Synthesis of MnZn Ferrite Precursor Powders","authors":"Zhanyuan Xu, Wei Zhao, Jie-fu Liu, J. Fan","doi":"10.3390/magnetochemistry9060146","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060146","url":null,"abstract":"MnZn ferrite precursor powders were prepared by the nano in situ composite method. Three surfactants, which include polyethylene glycol 400 (PEG-400), cetyltrimethyl ammonium bromide (CTAB), and sodium dodecyl sulfate (SDS), were usedM and the impact of the surfactants on the precursor sol solutions and precursor powders was studied. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, a field emission scanning electron microscope (FE-SEM), a transmission electron microscope (TEM), a Zeta potential meter, a BET surface analyzer, and a vibrational sample magnetometer (VSM) were used to characterize the precursor sol solutions and the precursor powders. The results showed that these surfactants can improve the dispersion state and Zeta potentials of sol particles and increase the specific surface areas of the precursor powders. Moreover, the precursor powders were composed of MnZn ferrite, and some were amorphous. CTAB was the optimum surfactant and the zeta potential of the sol particles and the specific surface area of the precursor powders named P-0.1CTAB are 10.7 mV and 129.07 m2/g, respectively. In addition, the nano-particles that were made up of the P-0.1CTAB precursor powders had smaller sizes and more uniform particle distributions than the others. The magnetic properties’ improvement was attributed to the addition of surfactants, and CTAB is the optimal type. In addition, the novel nano in situ composite method will inspire fresh thinking and investigation into the research of ferrite.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42132890","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