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Wang K, Liu B, Lian X, Xuan S, Deng H, Gong X. Nanosphere Chain Model of Magnetic Fluid and Its Dynamic Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:6187-6197. [PMID: 38237145 DOI: 10.1021/acs.langmuir.3c03538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
The magnetorheological effect is a critically important mechanical property of magnetic fluids. Accurately capturing the macroscopic properties of magnetorheological fluids with elongated particle forms, such as nanosphere chains, remains a challenging task, particularly due to the complexities arising from particle asymmetry. Traditional particle dynamics primarily utilize spherical particles as computational units, but this approach can lead to significant inaccuracies, especially when analyzing nonspherical magnetorheological fluids, due to the neglect of particle asymmetry. In this work, an advanced particle dynamics model has been developed by integrating the rotation and collision of these asymmetric particles, specifically tailored for the configuration of nanosphere chains. This model exhibits a significant reduction in error by a factor of 3.883, compared to conventional particle models. The results demonstrate that alterations in the geometric characteristics of magnetic nanosphere chains can cause changes in mesoscopic structures and magnetic potential energy, thereby influencing the mechanical properties at the macroscopic level. This work has developed an accurate mesoscopic simulation method for calculating chain-type magnetorheological fluids, establishing a connection between mesoscopic structures and macroscopic properties, and unveiling the tremendous potential for accelerating the design of next-generation magnetic fluids using this approach.
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Affiliation(s)
- Kang Wang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
| | - Bing Liu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
| | - Xinyu Lian
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
| | - Shouhu Xuan
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
| | - Huaxia Deng
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, 15 Beisihuan West Road, Beijing 100190, China
| | - Xinglong Gong
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China (USTC), Hefei, Anhui 230027, P. R. China
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96, Jinzhai Road, Hefei, Anhui 230026, P. R. China
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Wang H, Bi C, Liu W, Zhou F. Squeeze Behaviors of Magnetorheological Fluids under Different Compressive Speeds. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3109. [PMID: 37109946 PMCID: PMC10145044 DOI: 10.3390/ma16083109] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/03/2023] [Accepted: 04/06/2023] [Indexed: 06/19/2023]
Abstract
The compression tests under the unidirection for magnetorheological (MR) fluids have been studied at different compressive speeds. The results indicated that curves of compressive stress under different compression speeds at the applied magnetic field of 0.15 T overlapped well and were shown to be an exponent of about 1 of the initial gap distance in the elastic deformation region and accorded well with the description of continuous media theory. The difference in compressive stress curves increases significantly with an increasing magnetic field. At this time, the continuous media theory description could not be accounted for the effect of compressive speed on the compression of MR fluid, which seems to deviate from the Deborah number prediction under the lower compressive speeds. An explanation based on the two-phase flow due to aggregations of particle chains resulting in much longer relaxation times at a lower compressive speed was proposed to explain this deviation. The results have guiding significance for the theoretical design and process parameter optimization for the squeeze-assisted MR devices such as MR dampers and MR clutches based on the compressive resistance.
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Si X, Luo M, Li M, Ma Y, Huang Y, Ge Y. Magnetic properties of a soft magnetic elastomer based on antioxidant magnetic composite particles and a water-soluble polymer matrix. SOFT MATTER 2023; 19:1008-1016. [PMID: 36647597 DOI: 10.1039/d2sm01426b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A soft magnetic elastomer, called a magnetorheological elastomer (MRE), based on a polyacrylamide (PAM) modified carbonyl iron particle (P-CIP) composite and a water-soluble PAM matrix was designed and prepared by the chemical polymerization and crosslinking method. P-CIPs were synthesized by the polymerization of an acrylamide monomer on the CIP surface to improve the oxidation resistance of CIPs and the interaction between the particles and polymer matrix in the MRE. The results obtained from infrared spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) (in a nitrogen atmosphere) show that the coating effect of the polymer on the particle surface is very good. TGA (in an air atmosphere) curves indicate that the P-CIPs show strong oxidation resistance. Meanwhile, the test results obtained for the magnetic properties show that the MRE with P-CIPs has a saturation magnetization (94.7 emu g-1), a relative magnetorheological effect (687.5%), and a Payne effect factor (92%) under the action of a strong magnetic field (1 T). It was also clearly found that these properties are enhanced with increasing magnetic field intensity. Furthermore, the chain effect of magnetic particles under a magnetic field, the strong particle-matrix interaction and its breakdown process with increasing shear strain were discussed in this work.
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Affiliation(s)
- Xiaodong Si
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
- Key Laboratory of Unconventional Oil and Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580, China
| | - Mingliang Luo
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
- Key Laboratory of Unconventional Oil and Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580, China
| | - Mingzhong Li
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
- Key Laboratory of Unconventional Oil and Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580, China
| | - Yuben Ma
- Oilfield Production Department, China Oilfield Services Limited, Tianjin 300451, China
| | - Yige Huang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
- Key Laboratory of Unconventional Oil and Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580, China
| | - Yunzhi Ge
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
- Key Laboratory of Unconventional Oil and Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580, China
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Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions. MATERIALS 2021; 14:ma14216498. [PMID: 34772023 PMCID: PMC8585394 DOI: 10.3390/ma14216498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/22/2021] [Accepted: 10/27/2021] [Indexed: 02/04/2023]
Abstract
In this paper, we study the electrical properties of new hybrid magnetorheological suspensions (hMRSs) and propose a theoretical model to explain the dependence of the electric capacitance on the iron volumetric fraction, ΦFe, of the dopants and on the external magnetic field. The hMRSs, with dimensions of 30 mm×30 mm×2 mm, were manufactured based on impregnating cotton fabric, during heating, with three solutions of iron microparticles in silicone oil. Flat capacitors based on these hMRSs were then produced. The time variation of the electric capacitance of the capacitors was measured in the presence and absence of a magnetic field, B, in a time interval of 300 s, with Δt=1 s steps. It was shown that for specific values of ΦFe and B, the coupling coefficient between the cotton fibers and the magnetic dipoles had values corresponding to very stable electrical capacitance. Using magnetic dipole approximation, the mechanisms underlying the observed phenomena can be described if the hMRSs are considered continuous media.
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