1
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Camacho G, de Vicente J. Speeding the directed self-assembly under toggled magnetic fields. Phys Rev E 2025; 111:045414. [PMID: 40411081 DOI: 10.1103/physreve.111.045414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2024] [Accepted: 03/10/2025] [Indexed: 05/26/2025]
Abstract
Toggled field self-assembly is a useful way to circumvent kinetic arrest of the induced structures in field-directed self-assembly and, in particular, in magnetic suspensions such as magnetorheological (MR) fluids. During the field-off period, Brownian motion permits rearrangement of the particles and classical system-spanning chains (typically formed under uniaxial DC fields) collapse into dense ellipsoidal aggregates that are more energetically favorable. Here we show, through the use of experiments and particle-level simulations, that the process is very sensitive to the field configuration (e.g., frequency and strength), and, in particular, it can be dramatically accelerated when the magnetic field strength is increased. Moreover, when the field strength reaches sufficiently high values, the classical two-step aggregation process becomes a single one and morphological differences in the final structures emerge.
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Affiliation(s)
- Guillermo Camacho
- University of Granada, F2N2Lab, Magnetic Soft Matter Group, Department of Applied Physics, Faculty of Sciences, C/Fuentenueva s/n, 18071 Granada, Spain
| | - Juan de Vicente
- University of Granada, F2N2Lab, Magnetic Soft Matter Group, Department of Applied Physics, Faculty of Sciences, C/Fuentenueva s/n, 18071 Granada, Spain
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2
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Zhuang S, Cao Y, Song W, Zhang P, Choi SB. Effect of Additives on Tribological Performance of Magnetorheological Fluids. MICROMACHINES 2024; 15:270. [PMID: 38398998 PMCID: PMC10892829 DOI: 10.3390/mi15020270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/05/2024] [Accepted: 02/12/2024] [Indexed: 02/25/2024]
Abstract
In this study, nano-diamond (ND) and MoS2 powder are used as additives in a carbonyl iron-based magnetorheological fluid (MRF) to improve its tribological performance. MRFs are prepared by dispersing 35 wt.% of CI particles in silicone oil and adding different proportions (0, 1, 3, or 5 wt.%) of ND and MoS2 additives. Seven kinds of MRFs are made and tested using reciprocating friction and wear tester under different normal loads, and then the friction characteristics are evaluated by analyzing the experimental results. The morphological properties of MRFs and contacting surfaces before and after the tests are also observed using a scanning electron microscope and analyzed via energy-dispersive X-ray spectroscopy. The results show that the appropriate weight percentage of MoS2 additives may decrease the friction coefficient and wear zone. It is also demonstrated from detailed analyses of worn surfaces that the wear mechanism is influenced not only by additives, but also by the applied normal load and magnetic field strength.
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Affiliation(s)
- Songran Zhuang
- College of Information Science and Engineering, Northeastern University, Shenyang 110819, China;
| | - Yongbing Cao
- School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;
| | - Wanli Song
- School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;
| | - Peng Zhang
- Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China;
| | - Seung-Bok Choi
- Department of Mechanical Engineering, The State University of New York, Korea (SUNY Korea), Incheon 21978, Republic of Korea
- Department of Mechanical Engineering, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City 70000, Vietnam
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3
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N A, Jakkamputi LP, Gnanasekaran S, Thangamuthu M, Rakkiyannan J, Bhalerao YJ. Dynamic Behavior Modeling of Natural-Rubber/Polybutadiene-Rubber-Based Hybrid Magnetorheological Elastomer Sandwich Composite Structures. Polymers (Basel) 2023; 15:4583. [PMID: 38232007 PMCID: PMC10708534 DOI: 10.3390/polym15234583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/26/2023] [Accepted: 11/28/2023] [Indexed: 01/19/2024] Open
Abstract
This study investigates the dynamic characteristics of natural rubber (NR)/polybutadiene rubber (PBR)-based hybrid magnetorheological elastomer (MRE) sandwich composite beams through numerical simulations and finite element analysis, employing Reddy's third-order shear deformation theory. Four distinct hybrid MRE sandwich configurations were examined. The validity of finite element simulations was confirmed by comparing them with results from magnetorheological (MR)-fluid-based composites. Further, parametric analysis explored the influence of magnetic field intensity, boundary conditions, ply orientation, and core thickness on beam vibration responses. The results reveal a notable 10.4% enhancement in natural frequencies in SC4-based beams under a 600 mT magnetic field with clamped-free boundary conditions, attributed to the increased PBR content in MR elastomer cores. However, higher magnetic field intensities result in slight frequency decrements due to filler particle agglomeration. Additionally, augmenting magnetic field intensity and magnetorheological content under clamped-free conditions improves the loss factor by from 66% to 136%, presenting promising prospects for advanced applications. This research contributes to a comprehensive understanding of dynamic behavior and performance enhancement in hybrid MRE sandwich composites, with significant implications for engineering applications. Furthermore, this investigation provides valuable insights into the intricate interplay between magnetic field effects, composite architecture, and vibration response.
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Affiliation(s)
- Ahobal N
- Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru 560078, India;
- School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India;
| | | | - Sakthivel Gnanasekaran
- School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India;
| | - Mohanraj Thangamuthu
- Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore 641112, India;
| | | | - Yogesh Jayant Bhalerao
- Department of Mechanical Engineering and Design, School of Engineering, University of East Anglia, Norwich Research Park, Norwich NR47 TIJ, UK;
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Lv J, Wang S, Li Y, Wu M, He J, Zhao T, Wei Y. A new method for measuring magnetorheological fluid redispersibility by testing yield stresses of sediments at different depths. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:015103. [PMID: 36725614 DOI: 10.1063/5.0129497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/09/2022] [Indexed: 06/18/2023]
Abstract
Magnetorheological fluid (MRF) is a widely used smart material that suffers from sedimentation. Since sedimentation is unavoidable, it is crucial to study and improve the redispersibility of MRFs. However, previous redispersibility testing methods have problems, such as complicated operation and low precision. Simultaneously, a simple and effective method is urgently needed for high-precision modeling of MRF sedimentation to test the rheological properties of settled MRFs at different depths. After systematically analyzing the redispersion problem, this paper proposes decoupling the energy required for redispersing settled MRFs into two parts, which are related to different factors. These two parts are the energy required to separate the agglomerated particles (related to the MRF formula) and that to redisperse the settled MRF uniformly vertically against gravity (related to the solid concentration and packing limit). The energy that separates the agglomerated particles is proportional to the shear stress of slowly shearing the corresponding agglomerated samples, i.e., the yield stress. Thus, this paper proposes a simple microdamage quasi-static indentation method to measure the yield stresses of settled MRFs at different depths to characterize the redispersibility of the corresponding MRFs. Herein, this method is applied to study the mechanisms of the influences of surfactants, thixotropic agents, and their networks on the redispersibility of MRFs. The results indicate that a well-dispersed plate-like thixotropic agent network can effectively improve redispersibility, while surfactants with poor compatibility degrade redispersibility. In summary, this redispersibility test method will greatly facilitate studies of MRFs, such as optimizing the formulas and establishing sedimentation models.
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Affiliation(s)
- Jingcheng Lv
- School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
| | - Shiwei Wang
- General Research and Development Institute, China FAW Corporation Limited, Changchun 130000, China
| | - Yao Li
- General Research and Development Institute, China FAW Corporation Limited, Changchun 130000, China
| | - Mingyu Wu
- School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
| | - Junxiang He
- School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
| | - Tong Zhao
- School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
| | - Yintao Wei
- School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
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5
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Tang X, Chang X, Zhang S, Li X, Wang S, Meng F. Self-assembly and magnetorheological performance of Fe3O4-based liquid-crystalline composites. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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6
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Milde R, Moucka R, Sedlacik M, Pata V. Iron-Sepiolite High-Performance Magnetorheological Polishing Fluid with Reduced Sedimentation. Int J Mol Sci 2022; 23:ijms232012187. [PMID: 36293044 PMCID: PMC9603551 DOI: 10.3390/ijms232012187] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 10/07/2022] [Accepted: 10/10/2022] [Indexed: 11/18/2022] Open
Abstract
A sedimentation-stable magnetorheological (MR) polishing slurry on the basis of ferrofluid, iron particles, Al2O3, and clay nanofiller in the form of sepiolite intended for MR polishing has been designed, prepared, and its polishing efficiency verified. Added clay substantially improved sedimentation stability of the slurry, decreasing its sedimentation rate to a quarter of its original value (1.8 to 0.45 mg s−1) while otherwise maintaining its good abrasive properties. The magnetisation curve measurement proved that designed slurry is soft magnetic material with no hysteresis, and its further suitability for MR polishing was confirmed by its magnetorheology namely in the quadratically increased yield stress due to the effect of applied magnetic field (0 to 600 kA m−1). The efficiency of the MR polishing process was tested on the flat samples of injection-moulded polyamide and verified by surface roughness/3D texture measurement. The resulting new composition of the MR polishing slurry exhibits a long-term stable system with a wide application window in the MR polishing process.
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Affiliation(s)
- Radoslav Milde
- Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 760 01 Zlin, Czech Republic
| | - Robert Moucka
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 760 01 Zlin, Czech Republic
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 760 01 Zlin, Czech Republic
| | - Michal Sedlacik
- Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 760 01 Zlin, Czech Republic
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 760 01 Zlin, Czech Republic
- Correspondence:
| | - Vladimir Pata
- Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 760 01 Zlin, Czech Republic
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Stable Magnetorheological Fluids Containing Bidisperse Fillers with Compact/Mesoporous Silica Coatings. Int J Mol Sci 2022; 23:ijms231911044. [PMID: 36232347 PMCID: PMC9570470 DOI: 10.3390/ijms231911044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/08/2022] [Accepted: 09/17/2022] [Indexed: 11/16/2022] Open
Abstract
A drawback of magnetorheological fluids is low kinetic stability, which severely limits their practical utilization. This paper describes the suppression of sedimentation through a combination of bidispersal and coating techniques. A magnetic, sub-micro additive was fabricated and sequentially coated with organosilanes. The first layer was represented by compact silica, while the outer layer consisted of mesoporous silica, obtained with the oil–water biphase stratification method. The success of the modification technique was evidenced with transmission electron microscopy, scanning electron microscopy/energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. The coating exceptionally increased the specific surface area, from 47 m2/g (neat particles) up to 312 m2/g, which when combined with lower density, resulted in remarkable improvement in the sedimentation profile. At this expense, the compact/mesoporous silica slightly diminished the magnetization of the particles, while the magnetorheological performance remained at an acceptable level, as evaluated with a modified version of the Cross model. Sedimentation curves were, for the first time in magnetorheology, modelled via a novel five-parameter equation (S-model) that showed a robust fitting capability. The sub-micro additive prevented the primary carbonyl iron particles from aggregation, which was projected into the improved sedimentation behavior (up to a six-fold reduction in the sedimentation rate). Detailed focus was also given to analyze the implications of the sub-micro additives and their surface texture on the overall behavior of the bidisperse magnetorheological fluids.
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8
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Zhuang Y, Li H, Song S, Peng X. Mechanism analysis of the carrier viscosity effect on shear stress of magnetorheological fluids. SOFT MATTER 2022; 18:6592-6598. [PMID: 35993171 DOI: 10.1039/d2sm00843b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Shear stress is an important index to evaluate the rheological behavior of magnetorheological fluids (MRFs), which is not only related to the properties of ferromagnetic particles, but also the viscosity of the carrier. However, the research related to the carrier viscosity is quite lacking, and the mechanism of its effect on shear stress is still unclear. In this work, the carrier viscosity effect on the microstructure of MRFs under shearing was investigated via numerical simulations, and the relationship between chain inclination and carrier viscosity was presented for the first time. It was found that the deflection angle of the chain increases with the increase of carrier viscosity. Based on the simulation results, the relationship between the shear resistance induced by the magnetic field and the deflection angle of the chain was studied. Finally, a constitutive model incorporating the mechanism of the viscosity effect on shear stress was proposed, and the calculated results agreed well with the experimental data. This work provides new insights into the effect of carrier viscosity and can help us to better understand the corresponding microscopic mechanism.
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Affiliation(s)
- Yang Zhuang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.
- College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China
| | - Haitao Li
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.
- College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China
| | - Shangwei Song
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.
- College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China
| | - Xianghe Peng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.
- College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China
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9
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Liu Z, Wang S, Feng F, Xie L. A Magnetorheological Fluid Based Force Feedback Master Robot for Vascular Interventional Surgery. J INTELL ROBOT SYST 2022. [DOI: 10.1007/s10846-022-01716-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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10
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Guo C, Liu J, Li X, Yang S. Effect of cavitation bubble on the dispersion of magnetorheological polishing fluid under ultrasonic preparation. ULTRASONICS SONOCHEMISTRY 2021; 79:105782. [PMID: 34649163 PMCID: PMC8517386 DOI: 10.1016/j.ultsonch.2021.105782] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 09/28/2021] [Accepted: 10/04/2021] [Indexed: 05/31/2023]
Abstract
In the ultrasonic dispersion process, the ultrasonic cavitation effect can seriously affect the dispersion efficiency of magnetorheological polishing fluid (MRPF), but the mechanism remains unclear now. Through considering the continuity equation and Vand viscosity equation of the suspension, a revised cavitation bubble dynamic model in the MRPF was developed and calculated. The effects of presence or absence of solid particles, the volume fraction of solid particles, and viscosity on the cavitation bubble motion characteristics in the MRPF were discussed. Settlement experiments of the MRPF under ultrasonic and mechanical dispersion were observed. Analysis of particle dispersion is made by trinocular biomicroscope and image processing of the microscopic morphology of the MRPF. The results show that the high volume fraction of carbonyl iron particle (CIP) will significantly weaken the cavitation effect, and the low volume fraction of green silicon carbide (GSC) has a negligible effect on the cavitation effect in the MRPF. When the liquid viscosity is greater than or equal to 0.1 Pa·s, it is inconvenient to produce micro-jets in the MRPF. The sedimentation rate of the MRPF prepared by ultrasonic dispersion is lower than mechanical dispersion when the volume fraction of CIP is between 1% and 25%. The dispersion ratio under ultrasonic dispersion is lower than that under mechanical dispersion. The experimental results fit the simulation well. It offers a theoretical basis for exploring the ultrasonic cavitation effect in the industrial application of the MRPF.
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Affiliation(s)
- Ce Guo
- Shanxi Key Laboratory of Precision Machining, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, 030024 Taiyuan, China; Taiyuan Heavy Mechinery Group Co., LTD, 030024 Taiyuan, China.
| | - Jing Liu
- Shanxi Key Laboratory of Precision Machining, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
| | - Xiuhong Li
- Shanxi Key Laboratory of Precision Machining, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
| | - Shengqiang Yang
- Shanxi Key Laboratory of Precision Machining, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
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11
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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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12
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Jiao D, Lesage K, Yardimci MY, El Cheikh K, Shi C, De Schutter G. Rheological Properties of Cement Paste with Nano-Fe 3O 4 under Magnetic Field: Flow Curve and Nanoparticle Agglomeration. MATERIALS 2020; 13:ma13225164. [PMID: 33207744 PMCID: PMC7697196 DOI: 10.3390/ma13225164] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 12/02/2022]
Abstract
Understanding the influence of magnetic fields on the rheological behavior of flowing cement paste is of great importance to achieve active rheology control during concrete pumping. In this study, the rheological properties of cementitious paste with water-to-cement (w/c) ratio of 0.4 and nano-Fe3O4 content of 3% are first measured under magnetic field. Experimental results show that the shear stress of the cementitious paste under an external magnetic field of 0.5 T is lower than that obtained without magnetic field. After the rheological test, obvious nanoparticle agglomeration and bleeding are observed on the interface between the cementitious paste and the upper rotating plate, and results indicate that this behavior is induced by the high magnetic field strength and high-rate shearing. Subsequently, the hypothesis about the underlying mechanisms of nanoparticles migration in cementitious paste is illustrated. The distribution of the nanoparticles in the cementitious paste between parallel plates is examined by the magnetic properties of the powder as determined by a vibrating sample magnetometer. It is revealed that the magnetization of cementitious powders at different sections and layers provides a solid verification of the hypothesis.
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Affiliation(s)
- Dengwu Jiao
- Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium; (D.J.); (K.L.); (M.Y.Y.); (K.E.C.)
- Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;
| | - Karel Lesage
- Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium; (D.J.); (K.L.); (M.Y.Y.); (K.E.C.)
| | - Mert Yucel Yardimci
- Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium; (D.J.); (K.L.); (M.Y.Y.); (K.E.C.)
| | - Khadija El Cheikh
- Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium; (D.J.); (K.L.); (M.Y.Y.); (K.E.C.)
| | - Caijun Shi
- Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;
| | - Geert De Schutter
- Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium; (D.J.); (K.L.); (M.Y.Y.); (K.E.C.)
- Correspondence: ; Tel.: +32-9-264-5521
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13
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Kamgar A, Hassanajili S, Unbehaun H. Oil spill remediation from water surface using induction of magnetorheological behavior in oil by functionalized sawdust. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.05.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Du Z, Qiu Y, Niu T, Wang W, Ye X, Wang J, Zhang WL, Choi HJ, Zeng H. Bio-Inspired Passion Fruit-like Fe 3O 4@C Nanospheres Enabling High-Stability Magnetorheological Performances. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7706-7714. [PMID: 32517475 DOI: 10.1021/acs.langmuir.0c00301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magnetorheological (MR) fluids have been successfully utilized in versatile fields but are still limited by their relatively inferior long-term dispersion stability. Herein, bio-inspired passion fruit-like Fe3O4@C nanospheres were fabricated via a simple hydrothermal and calcination approach to tackle the settling challenge. The unique structures provide sufficient active interfaces for the penetration of carrier mediums, leading to preferable wettability between particles and medium oils. Compared with the bare Fe3O4 nanoparticle suspension, the resulting Fe3O4@C nanosphere-based MR fluid exhibits desirable stability and relatively low field-off viscosity even at a high particle concentration up to 35 vol %.
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Affiliation(s)
- Zhiwei Du
- Herbert Gleiter Institute of Nanoscience, School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yan Qiu
- Advanced Rheology Institute, Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
| | - Tianchao Niu
- Herbert Gleiter Institute of Nanoscience, School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Wenchao Wang
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xudan Ye
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jiong Wang
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Wen Ling Zhang
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Republic of Korea
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
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15
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Zakinyan A, Arefyev I. Thermal conductivity of emulsion with anisotropic microstructure induced by external field. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04672-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Wang Y, Xie W, Wu D. Rheological properties of magnetorheological suspensions stabilized with nanocelluloses. Carbohydr Polym 2020; 231:115776. [DOI: 10.1016/j.carbpol.2019.115776] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 12/12/2019] [Accepted: 12/20/2019] [Indexed: 12/24/2022]
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17
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Li HP, Chen F, Wang G, Tian ZZ, Ji JJ. Novel ring-type measurement system of shear yield stress for magnetorheological fluid under high temperature. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:035105. [PMID: 32259945 DOI: 10.1063/1.5128582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 02/14/2020] [Indexed: 06/11/2023]
Abstract
In order to investigate the shear yield stress of magnetorheological (MR) fluid at different temperatures, shear gaps, and shear rates, a ring measurement system is designed based on the MR characteristics. The magnetic field and temperature field of the system are simulated and analyzed, which proves that the design of the measurement system is reasonable. On this basis, the measurement system is manufactured and experiments are carried out to verify its performance. The results show that the system can provide a uniform and strong enough magnetic field to make MR effects occur. Meanwhile, the temperature of the shear gap can reach 100 °C in 610 s, and it can increase up to 240 °C when heating continues, which can provide stable measurement conditions at different temperatures, especially at high temperatures. All the results of the experiments show that the measurement system meets the requirements of measuring the shear yield stress of MR fluid. To test the accuracy of the measurement system, repeated experiments are carried out as well. The shear yield stress by the system is almost the same as that provided by the manufacturer, showing excellent measuring precision. The repeatability error of the measurement system is less than 4.02%, indicating that the measurement system is of high accuracy.
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Affiliation(s)
- Hao-Peng Li
- School of Mechatronic Engineering, China University of Mining and Technology, No. 1, Daxue Road, Tongshan Zone, Xuzhou, Jiangsu Province 221116, People's Republic of China
| | - Fei Chen
- School of Mechatronic Engineering, China University of Mining and Technology, No. 1, Daxue Road, Tongshan Zone, Xuzhou, Jiangsu Province 221116, People's Republic of China
| | - Ge Wang
- School of Mechatronic Engineering, China University of Mining and Technology, No. 1, Daxue Road, Tongshan Zone, Xuzhou, Jiangsu Province 221116, People's Republic of China
| | - Zu-Zhi Tian
- School of Mechatronic Engineering, China University of Mining and Technology, No. 1, Daxue Road, Tongshan Zone, Xuzhou, Jiangsu Province 221116, People's Republic of China
| | - Jin-Jie Ji
- School of Mechatronic Engineering, China University of Mining and Technology, No. 1, Daxue Road, Tongshan Zone, Xuzhou, Jiangsu Province 221116, People's Republic of China
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18
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Effect of medium viscosity on rheological characteristics of magnetite-based magnetorheological fluids. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.07.049] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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19
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Wang G, Zhao D, Li N, Zeng Y, Han S, Ma Y, Dong X, Yu R. Facile synthesis of hierarchically structured flower-like Fe3O4 microspheres for high-performance magnetorheological fluids. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.06.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Modeling the Response of Magnetorheological Fluid Dampers under Seismic Conditions. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9194189] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Magnetorheological (MR) fluid is a smart material fabricated by mixing magnetic-responsive particles with non-magnetic-responsive carrier fluids. MR fluid dampers are able to provide rapid and reversible changes to their damping coefficient. To optimize the efficiency and effectiveness of such devices, a computational model is developed and presented where the flow field is simulated using the computational fluid dynamics approach, coupled with the magnetohydrodynamics model. Three different inlet pressure profiles were designed to replicate real loading conditions are examined, namely a constant pressure, a sinusoidal pressure profile, and a pressure profile mimicking the 1994 Northbridge earthquake. When the MR fluid damper was in its off-state, a linear pressure drop between the inlet and the outlet was observed. When a uniform perpendicular external magnetic field was applied to the annular orifice of the MR damper, a significantly larger pressure drop was observed across the annular orifice for all three inlet pressure profiles. It was shown that the fluid velocity within the magnetized annular orifice decreased proportionally with respect to the strength of the applied magnetic field until saturation was reached. Therefore, it was clearly demonstrated that the present model was capable of accurately capturing the damping characteristics of MR fluid dampers.
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21
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Bica I, Anitas E. Magnetodielectric effects in hybrid magnetorheological suspensions based on beekeeping products. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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22
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Han JK, Lee JY, Choi HJ. Rheological effect of Zn-doped ferrite nanoparticle additive with enhanced magnetism on micro-spherical carbonyl iron based magnetorheological suspension. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Li HP, Chen F, Liu CH, Tian ZZ. Error Analysis and Optimization of Shear Yield Stress Model for Magnetorheological Fluid. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2019. [DOI: 10.1007/s13369-019-03903-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Mohamad N, Mazlan SA, Choi SB, Abdul Aziz SA, Sugimoto M. The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases. Int J Mol Sci 2019; 20:ijms20071525. [PMID: 30934679 PMCID: PMC6479971 DOI: 10.3390/ijms20071525] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 03/19/2019] [Accepted: 03/25/2019] [Indexed: 11/16/2022] Open
Abstract
The transient response of magnetorheological (MR) materials, in general, is very important for design consideration in MR-based devices. Better response to magnetic fields is beneficial for a better response rate to the electrical current applied in the electromagnetic coil. As a result, MR-based devices would have a high response to external stimuli. In this work, the principal characteristics of magnetorheological greases (MRGs) which have two different particle shapes are experimentally investigated. One type of particle distributed in the grease medium is conventional spherical-shaped carbonyl iron (CI) particles, while the other is plate-like CI particles made using a high-energy rotary ball mill from spherical CI particles. A set of bidisperse MRG samples are firstly prepared by adjusting the weight percentage of the plate-like CI particles and mixing with the spherical CI particles. Subsequently, three important properties of MRGs in terms of their practical application are measured and compared between the two different particle shapes. The field-dependent apparent viscoelastic properties of the prepared MRG samples are measured, followed by the field-dependent storage and loss moduli using an oscillatory shear rheometer. In addition, the transient response time, which indicates the speed in the actuating period of MRGs, is measured by changing the strain amplitude. Then, a comparative assessment on the three properties are undertaken between two different particle shapes by presenting the corresponding results in the same plot. It is shown that the bidisperse MRG with plate-like CI particles exhibits an increase in the initial apparent viscosity as well as stiffness property compared to the MRG with spherical particles only.
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Affiliation(s)
- Norzilawati Mohamad
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia.
| | - Saiful Amri Mazlan
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia.
| | - Seung-Bok Choi
- Department of Mechanical Engineering, Smart Structures and Systems Laboratory, Inha University, Incheon 402-751, Korea.
| | - Siti Aishah Abdul Aziz
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia.
| | - Masataka Sugimoto
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa 992-8510, Japan.
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25
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Controlled synthesis of CoFe2O4/MoS2 nanocomposites with excellent sedimentation stability for magnetorheological fluid. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.11.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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26
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Seo YP, Han S, Choi J, Takahara A, Choi HJ, Seo Y. Searching for a Stable High-Performance Magnetorheological Suspension. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1704769. [PMID: 30151957 DOI: 10.1002/adma.201704769] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 05/28/2018] [Indexed: 06/08/2023]
Abstract
Magnetorheological (MR) fluids are a type of smart material with rheological properties that may be controlled through mesostructural transformations. MR fluids form solid-like fibril structures along the magnetic field direction upon application of a magnetic field due to magnetopolarization of soft-magnetic particles when suspended in an inert medium. A reverse structural transition occurs upon removal of the applied field. The structural changes are very fast on the order of milliseconds. The rheological properties of MR fluids vary with the application of a magnetic field, resulting in non-Newtonian viscoplastic flow behaviors. Recent applications have increased the demand for MR materials with better performance and good long-term stability. A variety of industrial MR materials have been developed and tested in numerous experimental and theoretical studies. Because modeling and analysis are essential to optimize material design, a new macroscale structural model has been developed to distinguish between static yield stress and dynamic yield stress and describe the flow behavior over a wide range of shear rates. Herein, this recent progress in the search for advanced MR fluid materials with good stability is described, along with new approaches to MR flow behavior analysis. Several ways to improve the stability and efficiency of the MR fluids are also summarized.
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Affiliation(s)
- Youngwook P Seo
- RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro 1, Kwanakgu, Seoul, 08826, Republic of Korea
| | - Sangsok Han
- RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro 1, Kwanakgu, Seoul, 08826, Republic of Korea
| | - Junsok Choi
- RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro 1, Kwanakgu, Seoul, 08826, Republic of Korea
| | - Atsushi Takahara
- Institute for Materials Chemistry & Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka, 819-0395, Japan
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Yongsok Seo
- RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro 1, Kwanakgu, Seoul, 08826, Republic of Korea
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27
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Morillas JR, Bombard AJF, de Vicente J. Magnetorheology of Bimodal Fluids in the Single–Multidomain Limit. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03438] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jose R. Morillas
- Biocolloid and Fluid Physics Group and Excellence Research Unit “Modeling Nature” (MNat), Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 - Granada, Spain
| | - Antonio J. F. Bombard
- Universidade Federal de Itajubá, IFQ, Av BPS 1303, Itajubá, Minas Gerais 37500 903, Brazil
| | - Juan de Vicente
- Biocolloid and Fluid Physics Group and Excellence Research Unit “Modeling Nature” (MNat), Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 - Granada, Spain
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28
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Bica I, Anitas E. Magnetic field intensity effect on electrical conductivity of magnetorheological biosuspensions based on honey, turmeric and carbonyl iron. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.03.025] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Shah K, Choi SB, Choi HJ. Particle interaction energy and hysteresis in polar and non-polar medium based magnetic fluids. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Bica I, Anitas EM, Chirigiu L, Daniela C, Chirigiu LME. Hybrid magnetorheological suspension: effects of magnetic field on the relative dielectric permittivity and viscosity. Colloid Polym Sci 2018. [DOI: 10.1007/s00396-018-4356-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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31
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Kwon SH, Lee JH, Choi HJ. Magnetic Particle Filled Elastomeric Hybrid Composites and Their Magnetorheological Response. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1040. [PMID: 29921808 PMCID: PMC6024912 DOI: 10.3390/ma11061040] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 06/02/2018] [Accepted: 06/13/2018] [Indexed: 12/01/2022]
Abstract
The magnetorheological (MR) elastomer as a hard and soft hybrid functional material, a composite material consisting of magnetic hard particles embedded in elastomeric soft matrix, is a branch of MR materials that are functional smart materials rapidly responding to external magnetic fields. These tunable properties of MR elastomers facilitate a variety of applications. In this brief review paper, in addition to general information on the MR elastomers, recent research not only on a wide variety of MR elastomeric systems focusing on various magnetic particles, elastomeric matrices, additives and particle modification methods, but also on their characteristics including MR properties from dynamic oscillation tests is covered along with their mechanical properties such as the Payne effect, tensile strength and engineering applications.
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Affiliation(s)
- Seung Hyuk Kwon
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
| | - Jin Hyun Lee
- Polymer Technology Institute, Sungkyunkwan University, Suwon 16419, Korea.
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
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32
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Wang G, Ma Y, Cui G, Li N, Dong X. Two-dimensional Fe 3O 4/MoS 2 nanocomposites for a magnetorheological fluid with enhanced sedimentation stability. SOFT MATTER 2018; 14:1917-1924. [PMID: 29468233 DOI: 10.1039/c7sm02425h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superparamagnetic Fe3O4 nanoparticles were successfully deposited on the surface of MoS2 nanosheets (Fe3O4/MoS2) by a sonochemical method and the obtained Fe3O4/MoS2 nanocomposites were used as a promising candidate for a magnetorheological (MR) fluid. This MR fluid was prepared from the Fe3O4/MoS2 nanocomposites and its corresponding MR performances were examined using a rotational rheometer. The MR fluid based on Fe3O4/MoS2 showed typical MR effects with increasing viscosity, shear stress, yield stress and dynamic shear modulus depending on the applied magnetic fields. Compared with commercial carbonyl iron (CI) particles, the sedimentation stability of the Fe3O4/MoS2-MR fluid was greatly improved because of its unique two-dimensional structure and the reduced fluid-particle density mismatch. Therefore, the prepared Fe3O4/MoS2-based MR fluid with typical MR effects and good sedimentation stability would have great potential in practical applications.
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Affiliation(s)
- Guangshuo Wang
- School of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, China.
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33
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Effect of CoFe2O4 nanoparticles on a carbonyl iron based magnetorheological suspension. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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34
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Han JK, Choi HJ. Non-stoichiometric zinc-doped spinel ferrite nanoparticles with enhanced magnetic property and their magnetorheology. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4247-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Yang J, Yan H, Niu F, Zhang H. Probing of the magnetic responsive behavior of magnetorheological organogel under step field perturbation. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4249-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Bica I, Anitas E, Chirigiu L. Magnetic field intensity effect on plane capacitors based on hybrid magnetorheological elastomers with graphene nanoparticles. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.07.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Synthesis of hollow magnetite nanoparticles via self-assembly and their magnetorheological properties. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.09.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Gao CY, Piao SH, Choi HJ. Pickering emulsion polymerized magnetite-poly(methyl methacrylate) composite particles and their magnetorheology. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4086-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Kim MW, Han WJ, Kim YH, Choi HJ. Effect of a hard magnetic particle additive on rheological characteristics of microspherical carbonyl iron-based magnetorheological fluid. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.07.070] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Mietta JL, Tamborenea PI, Martin Negri R. Anisotropic magnetoresistivity in structured elastomer composites: modelling and experiments. SOFT MATTER 2016; 12:6430-6441. [PMID: 27418417 DOI: 10.1039/c6sm01173j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A constitutive model for the anisotropic magnetoresistivity in structured elastomer composites (SECs) is proposed. The SECs considered here are oriented pseudo-chains of conductive-magnetic inorganic materials inside an elastomer organic matrix. The pseudo-chains are formed by fillers which are simultaneously conductive and magnetic dispersed in the polymer before curing or solvent evaporation. The SEC is then prepared in the presence of a uniform magnetic field, referred to as Hcuring. This procedure generates the pseudo-chains, which are preferentially aligned in the direction of Hcuring. Electrical conduction is present in that direction only. The constitutive model for the magnetoresistance considers the magnetic pressure, Pmag, induced on the pseudo-chains by an external magnetic field, H, applied in the direction of the pseudo-chains. The relative changes in conductivity as a function of H are calculated by evaluating the relative increase of the electron tunnelling probability with Pmag, a magneto-elastic coupling which produces an increase of conductivity with magnetization. The model is used to adjust experimental results of magnetoresistance in a specific SEC where the polymer is polydimethylsiloxane, PDMS, and fillers are microparticles of magnetite-silver (referred to as Fe3O4[Ag]). Simulations of the expected response for other materials in both superparamagnetic and blocked magnetic states are presented, showing the influence of the Young's modulus of the matrix and filler's saturation magnetization.
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Affiliation(s)
- José Luis Mietta
- Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
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41
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Abstract
A new approach to dispersing magnetic particles via an oil organogel formed by a low molecular weight gelator to prepare MRF.
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Affiliation(s)
- Jianjian Yang
- Department of Chemistry and Material Engineering
- Logistic Engineering University
- Chongqing 401311
- PR China
| | - Hua Yan
- Department of Chemistry and Material Engineering
- Logistic Engineering University
- Chongqing 401311
- PR China
| | - Hansong Zhang
- Department of Chemistry and Material Engineering
- Logistic Engineering University
- Chongqing 401311
- PR China
| | - Xuemei Wang
- Department of Chemistry and Material Engineering
- Logistic Engineering University
- Chongqing 401311
- PR China
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42
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Reynolds CP, Klop KE, Lavergne FA, Morrow SM, Aarts DGAL, Dullens RPA. Deterministic aggregation kinetics of superparamagnetic colloidal particles. J Chem Phys 2015; 143:214903. [DOI: 10.1063/1.4936323] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Colin P. Reynolds
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Kira E. Klop
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - François A. Lavergne
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Sarah M. Morrow
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Dirk G. A. L. Aarts
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Roel P. A. Dullens
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
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43
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Chae HS, Piao SH, Choi HJ. Fabrication of spherical Fe3O4 particles with a solvothermal method and their magnetorheological characteristics. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2015.02.027] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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44
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Tensions and deformations in composites based on polyurethane elastomer and magnetorheological suspension: Effects of the magnetic field. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2015.02.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Bica I, Anitas E, Averis L. Influence of magnetic field on dispersion and dissipation of electric field of low and medium frequencies in hybrid magnetorheological suspensions. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.09.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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46
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Effect of surface treatment on magnetorheological characteristics of core-shell structured soft magnetic carbonyl iron particles. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3669-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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47
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Rabbani Y, Ashtiani M, Hashemabadi SH. An experimental study on the effects of temperature and magnetic field strength on the magnetorheological fluid stability and MR effect. SOFT MATTER 2015; 11:4453-4460. [PMID: 25940850 DOI: 10.1039/c5sm00625b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this study, the stability and rheological properties of a suspension of carbonyl iron microparticles (CIMs) in silicone oil were investigated within a temperature range of 10 to 85 °C. The effect of adding two hydrophobic (stearic and palmitic) acids on the stability and magnetorheological effect of a suspension of CIMs in silicone oil was studied. According to the results, for preparing a stable and efficient magnetorheological (MR) fluid, additives should be utilized. Therefore, 3 wt% of stearic acid was added to the MR fluid which led to an enhancement of the fluid stability over 92% at 25 °C. By investigating shear stress variation due to the changes in the shear rate for acid-based MR fluids, the maximum yield stress was obtained by fitting the Bingham plastic rheological model at high shear rates. Based on the existing correlations of yield stress and either temperature or magnetic field strength, a new model was fitted to the experimental data to monitor the simultaneous effect of magnetic field strength and temperature on the maximum yield stress. The results demonstrated that as the magnetic field intensified or the temperature decreased, the maximum yield stress increased dramatically. In addition, when the MR fluid reached its magnetic saturation, the viscosity of fluid depended only on the shear rate.
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Affiliation(s)
- Yahya Rabbani
- CFD Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran.
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48
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Kwon SH, Hong CH, Do PX, Choi SB, Choi HJ. Magnetorheology of a Carbonyliron Microsphere Suspension with a Halloysite Additive and Its Damping Force Characteristics. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b00233] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Seung Hyuk Kwon
- Department of Polymer Science and Engineering and ‡Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea
| | - Cheng Hai Hong
- Department of Polymer Science and Engineering and ‡Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea
| | - Phu Xuan Do
- Department of Polymer Science and Engineering and ‡Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea
| | - Seung-Bok Choi
- Department of Polymer Science and Engineering and ‡Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering and ‡Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea
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49
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Felicia LJ, Philip J. Effect of hydrophilic silica nanoparticles on the magnetorheological properties of ferrofluids: a study using opto-magnetorheometer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3343-3353. [PMID: 25734232 DOI: 10.1021/acs.langmuir.5b00103] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
For many technological applications of ferrofluids, the magnetorheological properties require being precisely controlled. We study the effect of hydrophilic silica on the magnetorheology of an oil-based ferrofluid containing Fe3O4 nanoparticles of size ∼10 nm. We observe that the presence of silica nanoparticles lowers the yield stresses, viscoelastic moduli, and shear thinning behavior of the ferrofluid because of the weakening of dipolar interactions, which was evident from the observed lower yield stresses exponent (<2). The ferrofluid containing silica exhibits a dominant elastic behavior, a reduced hysteresis during the forward and reverse magnetic field sweeps, and a longer linear viscoelastic regime under nonlinear deformation. The Mason number plots at low shear rates and magnetic fields show deviations from the master curve in the presence of silica. The magnetic field induced microstructures, visualized using opto-magnetorheometer, showed columnar aggregate structures along the field directions, which are reoriented along the shear flow direction at high shear rates. The image analysis shows that the average thickness of the columnar aggregates in pure ferrofluid is much larger than that of the mixed system, which suggests that the intervening silica matrix hampers the zippering transition of columns at higher magnetic field and shear rates. Our results suggest that optimization of rheological properties of ferrofluids is possible by carefully adding suitable silica nanoparticles, which may find practical applications such as dynamic seals, heat transfer, sensors, and opto-fluidic devices, etc.
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Affiliation(s)
- Leona J Felicia
- SMARTS, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
| | - John Philip
- SMARTS, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
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Ashtiani M, Hashemabadi S. An experimental study on the effect of fatty acid chain length on the magnetorheological fluid stabilization and rheological properties. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.046] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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