Yumeng Zhang, Wenrong Yang, Xue Shuang, Xiaorui Yang
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引用次数: 0
摘要
铁流体是阻尼器、密封件、传感器、能量收集和软机器人等多个工程研究领域的理想候选材料。在磁场下表现出有趣的物理化学特性（磁化特性、磁粘滞效应、磁光效应等）的铁流体一直处于研究的前沿。众所周知，磁粘效应是描述铁流体物理特性的关键指标。然而，由于忽略了磁偶极相互作用，现有模型几乎无法满足精确描述磁粘滞效应的迫切需要。本研究旨在修改 Shliomis 模型，以提高其准确性。首先，考虑到铁流体的磁特性，有必要考虑由布朗弛豫主导的磁性纳米粒子之间的磁偶极相互作用。其次，考虑到磁偶极相互作用，提出了修正的 Shliomis（MS）模型。最后，利用磁粘效应测量试验验证了 MS 模型的准确性，同时还探讨了剪切速率和温度对 MS 模型准确性的影响。MS 模型为指导铁流体的工程应用提供了理论基础。
The study of magnetoviscous effect of the ferrofluids considering magnetic dipole interactions
Ferrofluids are excellent candidates for several engineering research fields including dampers, seals, sensors, energy harvesting, and soft robotics. Ferrofluids exhibiting interesting physiochemical properties (magnetization properties, magnetoviscous effect, magneto-optic effect, etc.) under a magnetic field have been at the forefront of research. The magnetoviscous effect is known to be a critical indicator for describing the physical properties of ferrofluids. Nonetheless, the existing model barely meets the urgency for precisely describing the magnetoviscous effect due to the omission of magnetic dipole interactions. This study aims to modify the Shliomis model to improve its accuracy. Firstly, the magnetic properties of ferrofluids necessitate consideration of the magnetic dipolar interaction between the magnetic nanoparticles dominated by Brownian relaxation. Secondly, the modified Shliomis (MS) model is proposed by considering the magnetic dipole interactions. Lastly, the magnetoviscous effect measurement tests are used to verify the accuracy of the MS model, while also exploring the influences of shear rate and temperature on the MS model’s accuracy. The MS model provides a theoretical basis for guiding the engineering applications of ferrofluids.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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