Floating performance of tiny non-magnetic particles in ferrofluids

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-16 DOI:10.1016/j.jmmm.2025.173292

Liu Li , Decai Li , Yunqi Guo

引用次数: 0

Abstract

Magnetic buoyancy, known as a kind of force that acts between ferrofluids and non-magnetic particles submerged in ferrofluids magnetized by an intense gradient magnetic field, is systematically characterized in this study. Based on Rosensweig’s expression for magnetic buoyancy force and the perturbed magnetic field assumption for tiny particles, the criteria of magnetic field intensity which allow the non-magnetic particles to float on ferrofluids are established. Experimental results demonstrate that if the gradient magnetic field intensity exceeds a critical value, non-magnetic particles submerged in ferrofluids can achieve stable levitation via magnetic buoyancy. The magnetic buoyancy can be effectively utilized to separate mixed powders of micro-sized lead (Pb) and silicone dioxide (SiO₂), demonstrating potential for sustainable metal recycling in future applications.

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微小非磁性颗粒在铁磁流体中的漂浮性能

磁浮力是一种作用于被强梯度磁场磁化的铁磁流体中的铁磁流体和非磁性颗粒之间的力，本文对其进行了系统表征。基于Rosensweig的磁浮力表达式和微小颗粒的扰动磁场假设，建立了非磁性颗粒在铁磁流体上漂浮的磁场强度判据。实验结果表明，当梯度磁场强度超过某一临界值时，非磁性颗粒在铁磁流体中可以通过磁浮力实现稳定的悬浮。磁性浮力可以有效地用于分离微型铅（Pb）和二氧化硅（SiO2）混合粉末，显示出在未来应用中可持续金属回收的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.