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Magnetochemistry, Volume 10, Issue 1 (January 2024) – 6 articles

Cover Story (view full-size image): Understanding the influence of viscosity on heat dissipation in magnetic fluids is important from the perspective of their use in conditions of oscillating magnetic fields in technical science, as well as in the field of magnetic hyperthermia as a therapeutic tool in biomedicine, where fluids of different viscosities can serve as a model material for a deeper understanding of heat evolution under given conditions. Viscosity plays a crucial role in magnetic hyperthermia as it directly impacts the efficiency of heat generation and distribution in the surrounding area. Understanding the properties of viscosity ensures uniform heat distribution and effective energy absorption, leading to improved heat dissipation control during oscillating magnetic field application. View this paper
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13 pages, 4827 KiB  
Article
A Magnet Splicing Method for Constructing a Three-Dimensional Self-Decoupled Magnetic Tactile Sensor
by Huangzhe Dai, Zheyan Wu, Chenxian Meng, Chengqian Zhang and Peng Zhao
Magnetochemistry 2024, 10(1), 6; https://doi.org/10.3390/magnetochemistry10010006 - 21 Jan 2024
Viewed by 1199
Abstract
Tactile sensory organs for three-dimensional (3D) force perception are essential for most living organisms and enable them to perform complex and sophisticated tasks to survive and evolve. Magnetic-based tactile sensors have been developed rapidly in recent years due to the exploitability of 3D [...] Read more.
Tactile sensory organs for three-dimensional (3D) force perception are essential for most living organisms and enable them to perform complex and sophisticated tasks to survive and evolve. Magnetic-based tactile sensors have been developed rapidly in recent years due to the exploitability of 3D force decoupling. Here, a method of magnet splicing is introduced, which can be applied to a magnetic tactile sensor to realize 3D self-decoupling of magnets’ displacements. This method enables the magnets to produce a completely consistent magnetic field distribution as the ideal magnetization model within a certain working range, eliminating the compensation and correction of the 3D magnetic flux density signal. This method carves out a new way for the practical application of 3D decoupling theory, showcasing the great potential in the fields of magnetic sensors and magnetic actuators. Full article
(This article belongs to the Special Issue Functional Magnetic Materials: From Design to Application)
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17 pages, 8726 KiB  
Article
Preparation and Optimization of the Adsorbent for Phosphorus Removal Using the Response Surface Method
by Zhanmei Zhang, Zuqin Zou, Xiaoyu Ren, Yunxuan Huang, Yang Deng and Huaili Zheng
Magnetochemistry 2024, 10(1), 5; https://doi.org/10.3390/magnetochemistry10010005 - 09 Jan 2024
Cited by 1 | Viewed by 1222
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 [...] Read more.
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. Full article
(This article belongs to the Section Applications of Magnetism and Magnetic Materials)
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15 pages, 3981 KiB  
Article
The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts
by Catalin N. Marin and Iosif Malaescu
Magnetochemistry 2024, 10(1), 4; https://doi.org/10.3390/magnetochemistry10010004 - 02 Jan 2024
Viewed by 1279
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 [...] Read more.
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. Full article
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1 pages, 607 KiB  
Correction
Correction: Li et al. Dry Friction Performances of MoNx Coatings Deposited by High–Power Pulsed Magnetron Sputtering. Magnetochemistry 2023, 9, 60
by Fuqiang Li, Wei Dai, Qimin Wang, Haiqing Li and Zhengtao Wu
Magnetochemistry 2024, 10(1), 3; https://doi.org/10.3390/magnetochemistry10010003 - 29 Dec 2023
Viewed by 1013
Abstract
In the original publication [...] Full article
(This article belongs to the Section Magnetic Field)
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12 pages, 2587 KiB  
Article
The Influence of Viscosity on Heat Dissipation under Conditions of the High-Frequency Oscillating Magnetic Field
by Matus Molcan, Andrzej Skumiel, Jana Tothova, Katarina Paulovicova, Peter Kopcansky and Milan Timko
Magnetochemistry 2024, 10(1), 2; https://doi.org/10.3390/magnetochemistry10010002 - 24 Dec 2023
Viewed by 1239
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 [...] Read more.
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. Full article
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4 pages, 179 KiB  
Editorial
Functional Molecular Materials Insights
by Laura C. J. Pereira and Dulce Belo
Magnetochemistry 2024, 10(1), 1; https://doi.org/10.3390/magnetochemistry10010001 - 20 Dec 2023
Viewed by 1145
Abstract
In the commemorative Special Issue titled “Insights into Functional Molecular Materials—A Themed Collection Honoring Professor Manuel Almeida on His 70th Birthday”, eminent researchers from around the globe in the field of molecular materials science come together to acknowledge and celebrate the notable scientific [...] Read more.
In the commemorative Special Issue titled “Insights into Functional Molecular Materials—A Themed Collection Honoring Professor Manuel Almeida on His 70th Birthday”, eminent researchers from around the globe in the field of molecular materials science come together to acknowledge and celebrate the notable scientific contributions of Professor Almeida [...] Full article
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