keyword
https://read.qxmd.com/read/37421041/simulation-and-experimental-study-of-laser-processing-ndfeb-microarray-structure
#21
JOURNAL ARTICLE
Yong Zhao, Shuo Wang, Wenhui Yu, Pengyu Long, Jinlong Zhang, Wentao Tian, Fei Gao, Zhuji Jin, Hongyu Zheng, Chunjin Wang, Jiang Guo
NdFeB materials are widely used in the manufacturing of micro-linear motor sliders due to their excellent permanent magnetic properties. However, there are many challenges in processing the slider with micro-structures on the surface, such as complicated steps and low efficiency. Laser processing is expected to solve these problems, but few studies have been reported. Therefore, simulation and experiment studies in this area are of great significance. In this study, a two-dimensional simulation model of laser-processed NdFeB material was established...
March 31, 2023: Micromachines
https://read.qxmd.com/read/37297205/achievement-of-high-perpendicular-anisotropy-and-modification-of-heat-treatment-peeling-in-micron-thickness-nd-fe-b-films-used-for-magnetic-mems
#22
JOURNAL ARTICLE
Jingbin Huang, Zhanyong Wang, Shijie Liao, Fang Wang, Min Huang, Jian Zhang
Thick Nd-Fe-B permanent magnetic films with good perpendicular anisotropy have important applications in magnetic microelectromechanical systems (MEMSs). However, when the thickness of the Nd-Fe-B film reaches the micron level, the magnetic anisotropy and texture of NdFeB film will become worse, and it is also prone to peeling during heat treatment, which seriously limits their applications. In this paper, Si(100)/Ta(100 nm)/Ndx Fe91-x B9 (x = 14.5, 16.4, 18.2)/Ta (100 nm) films with thicknesses of 2-10 μm are prepared by magnetron sputtering...
May 30, 2023: Materials
https://read.qxmd.com/read/37251130/review-on-the-parameters-of-recycling-ndfeb-magnets-via-a-hydrogenation-process
#23
REVIEW
Alireza Habibzadeh, Mehmet Ali Kucuker, Mertol Gökelma
Regarding the restrictions recently imposed by China on the export of rare-earth elements (REEs), the world may face a serious challenge in supplying some REEs such as neodymium and dysprosium soon. Recycling secondary sources is strongly recommended to mitigate the supply risk of REEs. Hydrogen processing of magnetic scrap (HPMS) as one of the best approaches for magnet-to-magnet recycling is thoroughly reviewed in this study in terms of parameters and properties. The processes of hydrogen decrepitation (HD) and hydrogenation-disproportionation-desorption-recombination (HDDR) are two common methods for HPMS...
May 23, 2023: ACS Omega
https://read.qxmd.com/read/37154778/investigating-metal-tributyl-phosphate-complexes-during-supercritical-fluid-extraction-of-the-ndfeb-magnet-using-density-functional-theory-and-x-ray-absorption-spectroscopy
#24
JOURNAL ARTICLE
Jiakai Zhang, Ning Chen, Valeria Morozova, Oleksandr Voznyy, Gisele Azimi
Supercritical fluid extraction (SCFE) is gaining significant interest as a green technology for the recycling of end-of-life waste electrical and electronic equipment (WEEE). Neodymium iron boron (NdFeB) magnets, which contain large quantities of critical rare-earth elements such as neodymium, praseodymium, and dysprosium, are widely used in wind turbines and electric/hybrid vehicles. Hence, they are considered a promising secondary resource for these elements when they reach their end-of-life. Previously, the SCFE process was developed for recycling WEEE, including NdFeB; however, the process mechanism remains unexplored...
May 8, 2023: Inorganic Chemistry
https://read.qxmd.com/read/37109967/microstructure-optimization-and-coercivity-enhancement-of-sintered-ndfeb-magnet-by-grain-boundary-diffusion-of-multicomponent-tb-60-pr-10-cu-10-al-10-zn-10-films
#25
JOURNAL ARTICLE
Jingbin Huang, Min Huang, Fang Wang, Zhanyong Wang, Jian Zhang
The use of magnetron sputtering film as a diffusion source was recently achieved in the industrial production of important grain-boundary-diffusion magnets. In this paper, the multicomponent diffusion source film is explored to optimize the microstructure of NdFeB magnets and improve their magnetic properties. Multicomponent Tb60 Pr10 Cu10 Al10 Zn10 films of 10 μm in thickness and single Tb films of 10 μm in thickness were deposited on commercial NdFeB magnets' surfaces by magnetron sputtering as diffusion sources for grain boundary diffusion...
April 16, 2023: Materials
https://read.qxmd.com/read/36992604/low-gradient-magnetophoresis-of-nanospheres-and-nanorods-through-a-single-layer-of-paper
#26
JOURNAL ARTICLE
James Kah Chun Law, Wei Ming Ng, Wai Hong Chong, Qingsi Li, Lei Zhang, Fitri Khoerunnisa, JitKang Lim
The possible magnetophoretic migration of iron oxide nanoparticles through the cellulosic matrix within a single layer of paper is challenging with its underlying mechanism remained unclear. Even with the recent advancements of theoretical understanding on magnetophoresis, mainly driven by cooperative and hydrodynamics phenomena, the contributions of these two mechanisms on possible penetration of magnetic nanoparticles through cellulosic matrix of paper have yet been proven. Here, by using iron oxide nanoparticles (IONPs), both nanospheres and nanorods, we have investigated the migration kinetics of these nanoparticles through grade 4 Whatman filter paper with a particle retention of 20-25 μm...
March 29, 2023: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/36902964/impact-of-a-static-magnetic-field-on-early-osseointegration-a-pilot-study-in-canines
#27
JOURNAL ARTICLE
Roberta Michels, Carina Kampleitner, Toni Dobsak, Kevin Doppelmayer, Patrick Heimel, Stefan Lettner, Stefan Tangl, Reinhard Gruber, César Augusto Magalhães Benfatti
A static magnetic field generated by neodymium-iron-boron (NdFeB) magnets placed in the inner cavity of dental implants can enhance bone regeneration in rabbits. It is, however, unknown whether static magnetic fields support osseointegration in a canine model. We therefore determined the potential osteogenic effect of implants carrying NdFeB magnets inserted in the tibia of six adult canines in the early stages of osseointegration. Here, we report that after 15 days of healing, magnetic and regular implants showed a high variation with a median new bone-to-implant contact (nBIC) in the cortical (41...
February 23, 2023: Materials
https://read.qxmd.com/read/36837957/high-efficiency-3d-printed-three-chamber-electromagnetic-peristaltic-micropump
#28
JOURNAL ARTICLE
He Chen, Xiaodan Miao, Hongguang Lu, Shihai Liu, Zhuoqing Yang
This paper describes the design and characteristics of a three-chamber electromagnetic-driven peristaltic micropump based on 3D-printing technology. The micropump is composed of an NdFeB permanent magnet, a polydimethylsiloxane (PDMS) film, a 3D-printing pump body, bolts, electromagnets and a cantilever valve. Through simulation analysis and experiments using a single chamber and three chambers, valved and valveless, as well as different starting modes, the results were optimized. Finally, it is concluded that the performance of the three-chamber valved model is optimal under synchronous starting conditions...
January 19, 2023: Micromachines
https://read.qxmd.com/read/36837151/experimental-investigation-on-the-surface-formation-mechanism-of-ndfeb-during-diamond-wire-sawing
#29
JOURNAL ARTICLE
Bin Wu, Zhenyu Zhang, Junyuan Feng, Fanning Meng, Shengzuo Wan, Xuye Zhuang, Li Li, Haoran Liu, Fuxu Zhang
Diamond wire sawing is widely used in processing NdFeB rare earth permanent magnets. However, it induces periodic saw marks and fracture chipping pits, which severely affect the flatness and surface quality of the products. In this study, the lateral motion of the diamond wire was monitored to determine the surface formation mechanism. Then, a white light interferometer and an SEM were used to observe the sawed surface profile. Finally, the surface quality was quantitatively studied by identifying the area rate of fracture chipping pits with an image recognition MATLAB script...
February 11, 2023: Materials
https://read.qxmd.com/read/36720998/an-experimental-study-of-magnetic-compression-technique-for-ureterovesical-anastomosis-in-rabbits
#30
JOURNAL ARTICLE
Yingfeng An, Miaomiao Zhang, Shuqin Xu, Bo Deng, Aihua Shi, Yi Lyu, Xiaopeng Yan
This study aimed to explore the feasibility of the magnetic compression technique (MCT) for ureterovesical anastomosis in a rabbit model with ureteral obstruction. The distal ureteral obstruction model using female New Zealand rabbits was induced by ligating the distal end of the right ureter with silk thread for four weeks. A pair of cylindrical NdFeB magnets (daughter magnet and parent magnet) with a hole in the center was used for the ureterovesical anastomosis. The daughter magnet and the parent magnet were respectively placed close to the obstruction site through the dilated proximal ureter and urethra, and then the daughter-parent magnets pair was attracted together automatically...
January 31, 2023: Scientific Reports
https://read.qxmd.com/read/36686927/recycling-of-ndfeb-magnets-employing-oxidation-selective-leaching-and-iron-precipitation-in-an-autoclave
#31
JOURNAL ARTICLE
Elif Emil-Kaya, Buse Polat, Srecko Stopic, Sebahattin Gürmen, Bernd Friedrich
The increasing production of neodymium-iron-boron (NdFeB) magnets for technological applications results in disposal problems. NdFeB magnets contain a significant quantity of rare earth elements (REEs). China is the largest REEs producer, but it applies quotas and increases the export prices of REEs. To address this issue, this study aims at investigating the recovery process of REEs from scrap NdFeB magnets. After oxidation of NdFeB magnet powders, selective leaching with nitric acid was carried out to achieve high-purity REE-rich leaching liquor...
January 3, 2023: RSC Advances
https://read.qxmd.com/read/36677213/design-and-simulation-of-a-magnetization-drive-coil-based-on-the-helmholtz-principle-and-an-experimental-study
#32
JOURNAL ARTICLE
Changlong Zhao, Qiyin Lv, Junbao Yang, Ming Li, Qinxiang Zhao, Hongnan Ma, Xiaoyu Jia
In order to realize the magnetization of hydrogel mixed with NdFeB powder, a magnetization drive coil based on a Helmholtz coil is designed in this paper. The 3D model of the magnetic field system is drawn by the Maxwell software 3D module, and the influence of different factors on the magnetic induction intensity is analyzed to obtain the optimized structure of the magnetization drive coil; then, the central magnetic induction intensity and magnetic induction line distribution density of the magnetization drive coil and Helmholtz coil are compared to verify the reliability of the structure optimization...
January 6, 2023: Micromachines
https://read.qxmd.com/read/36654742/additively-manufactured-ndfeb-polyphenylene-sulfide-halbach-magnets-to-generate-variable-magnetic-fields-for-neutron-reflectometry
#33
JOURNAL ARTICLE
Tej Nath Lamichhane, Timothy R Charlton, Brian Andrews, Devanshi Malaviya, Arjun K Pathak, Haile Ambaye, Mathieu Doucet, Valeria Lauter, John Katsaras, Brian K Post, Mariappan Parans Paranthaman
Halbach arrays are the most efficient closed structures for generating directed magnetic fields and gradients, and are widely used in various electric machines. We utilized fused deposition modeling-based Big Area Additive Manufacturing technology to print customized, compensated concentric Halbach array rings, using polyphenylene sulfide-bonded NdFeB permanent magnets for polarized neutron reflectometry. The Halbach rings could generate a 0 ≤  B ≤ 0.30 T field, while preserving 90% polarization of an axial neutron beam...
August 1, 2022: 3D Printing and Additive Manufacturing
https://read.qxmd.com/read/36614190/bone-regeneration-guided-by-a-magnetized-scaffold-in-an-ovine-defect-model
#34
JOURNAL ARTICLE
Melania Maglio, Maria Sartori, Alessandro Gambardella, Tatiana Shelyakova, Valentin Alek Dediu, Matteo Santin, Yolanda Piñeiro, Manuel Bañobre López, Josè Rivas, Anna Tampieri, Simone Sprio, Lucia Martini, Alessandro Gatti, Alessandro Russo, Gianluca Giavaresi, Milena Fini
The reconstruction of large segmental defects still represents a critical issue in the orthopedic field. The use of functionalized scaffolds able to create a magnetic environment is a fascinating option to guide the onset of regenerative processes. In the present study, a porous hydroxyapatite scaffold, incorporating superparamagnetic Fe3 O4 nanoparticles (MNPs), was implanted in a critical bone defect realized in sheep metatarsus. Superparamagnetic nanoparticles functionalized with hyperbranched poly(epsilon-Lysine) peptides and physically complexed with vascular endothelial growth factor (VEGF) where injected in situ to penetrate the magnetic scaffold...
January 1, 2023: International Journal of Molecular Sciences
https://read.qxmd.com/read/36578290/a-sacrificial-magnet-concept-for-field-dependent-surface-science-studies
#35
JOURNAL ARTICLE
Danyang Liu, Jens Oppliger, Aleš Cahlík, Catherine Witteveen, Fabian O von Rohr, Fabian Donat Natterer
We demonstrate a straightforward approach to integrating a magnetic field into a low-temperature scanning tunneling microscope (STM) by adhering an NdFeB permanent magnet to a magnetizable sample plate. To render our magnet concept compatible with high-temperature sample cleaning procedures, we make the irreversible demagnetization of the magnet a central part of our preparation cycle. After sacrificing the magnet by heating it above its Curie temperature, we use a transfer tool to attach a new magnet in-situ prior to transferring the sample into the STM...
2023: MethodsX
https://read.qxmd.com/read/36424652/triple-tsms-system-shin-jiba-for-non-invasive-deep-brain-stimulation-a-validation-study-in-healthy-subjects
#36
JOURNAL ARTICLE
Sumiya Shibata, Tatsunori Watanabe, Takuya Matsumoto, Keisuke Yunoki, Takayuki Horinouchi, Hikari Kirimoto, Jianxu Zhang, Hen Wang, Jinglong Wu, Hideaki Onishi, Tatsuya Mima
BACKGROUND: Transcranial static magnetic field stimulation (tSMS) using a small and strong neodymium (NdFeB) magnet can temporarily suppress brain functions below the magnet. It is a promising non-invasive brain stimulation modality because of its competitive advantages such as safety, simplicity, and low-cost. However, current tSMS is insufficient to effectively stimulate deep brain areas due to attenuation of the magnetic field with the distance from the magnet. The aim of this study was to develop a brand-new tSMS system for non-invasive deep brain stimulation...
November 24, 2022: Journal of Neuroengineering and Rehabilitation
https://read.qxmd.com/read/36422448/effect-of-polyvinylpolypyrrolidone-surfactant-on-characteristics-of-iron-oxide-nanoparticles-synthesized-by-using-recycled-waste-permanent-magnets
#37
JOURNAL ARTICLE
Sung-Jei Hong, Ajin Jo, Sang Hyeok Hong, Byeong Jun Kim, Young Sung Kim, Suwon Yang, Jae-Yong Lee
In this study, iron oxide nanoparticles (FeOx NPs) were synthesized by using Fe solution recycled from NdFeB permanent magnet scrap. Furthermore, the effect of polyvinylpolypyrrolidone (PVP) as a surfactant on the characteristics of the FeOx NPs was investigated. Firstly, Fe solution was prepared by using 10% H2 SO4 solution and Na2 SO4 salt. In addition, three reducing agent solutions were prepared by dissolving PVP in 0.5 M NH4 OH solution in distilled (D.I.) water with concentrations of 0 wt%, 1 wt%, and 2 wt%, respectively...
November 19, 2022: Micromachines
https://read.qxmd.com/read/36387426/shape-programmable-magnetic-pixel-soft-robot
#38
JOURNAL ARTICLE
Ran Zhao, Houde Dai, Hanchen Yao, Yafeng Shi, Guopeng Zhou
Magnetic soft robots (MSRs) can achieve controllable shape-morphing by magnetic programming to the magnetic elastomer. However, the magnetization profile is usually implemented on a continuous region and is unchangeable. The deformation and function design of MSR hence is limited. This study presents a programmable magnetic pixel soft robot (MPSR). By encapsulating liquid-metal/NdFeB composites into a Silicone shell, the thermal-magnetic response functional film with lattice-structure is fabricated, with the highest pixel resolution of 1 × 1 mm2 ...
November 2022: Heliyon
https://read.qxmd.com/read/36382150/production-of-rare-earth-element-oxide-powders-by-solution-combustion-a-new-approach-for-recycling-of-ndfeb-magnets
#39
JOURNAL ARTICLE
Elif Emil-Kaya, Srecko Stopic, Sebahattin Gürmen, Bernd Friedrich
NdFeB magnets are employed in various technological applications due to their outstanding magnetic properties, such as high maximum energy product, high remanence and high coercivity. Production of NdFeB has gathered more interest, therefore the demand for rare earth elements (REEs) has continuously increased. The recovery of REEs has become essential to satisfy this demand in recent years. In the present study, a promising flowsheet is proposed for REEs recovery from NdFeB magnets, as follows: (1) acid baking, (2) employment of ultrasound-assisted water leaching, (3) the production of rare earth oxides (RE oxides) by a solution combustion method, and (4) a calcination process...
October 27, 2022: RSC Advances
https://read.qxmd.com/read/36363115/morphology-and-anti-corrosive-performance-of-cr-iii-passivated-zn-fe-alloy-coating-on-ndfeb-substrate
#40
JOURNAL ARTICLE
Ba Li, Xiaoshun Zhou, Xiaoping Chen, Song Fu, Xiangdong Wang, Dongliang Zhao
In this study, low-iron Zn-Fe alloy coatings and pure Zn coatings, with or without trivalent chromium passivation treatment, were electrodeposited onto a sintered NdFeB magnet from a weak acid chloride bath. The surface morphology and structure of the coatings were then examined using the X-ray diffraction, a scanning electron microscope and 3D white-light interfering surface analysis. Meanwhile, the electrodeposition behavior and anti-corrosive properties of the coatings were investigated using cyclic voltammetry, potentiodynamic polarization, electrochemical impedance spectroscopy, and natural salt spray tests...
October 27, 2022: Materials
keyword
keyword
170580
2
3
Fetch more papers »
Fetching more papers... Fetching...
Remove bar
Read by QxMD icon Read
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"

We want to hear from doctors like you!

Take a second to answer a survey question.