Special Issue "Magnetic-Responsive Molecular Particles Based Smart Materials: Model, Characterization and Applications"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 October 2020.

Special Issue Editor

Prof. Dr. Seung-bok Choi
Website
Guest Editor
Director of Smart Structures and Systems Lab, Department of Mechanical Engineering, Inha University, Incheon 22212, Korea
Interests: magnetorheological (MR) fluid; electrorheological (ER) fluid; polymer particles; magnetic particles; vibration control; haptic devices using MR/ER fluids; sensors and actuators using MR/ER fluids
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Special Issue Information

Dear colleagues,

Magnetorheological (MR) materials are one of the best candidates to fulfil the scope of controllable discrete devices and smart structure that react to the magnetic field. This is possible due to the chain-like structures of molecular nano- and micro-sized particles with respect to the magnetic field direction. The field-dependent properties of MR materials such as the viscoelastic modulus can be tuned by the magnetic field intensity and hence the performance of application devices can be easily controlled by implementing appropriate controllers those can provide an optimal magnetic field intensity to achieve desired responses. Thanks to this salient and eminent feature, MR materials are widely applied to numerous fields such as automotive shock absorber, vibration isolator, flexible haptic structure and so on. In general, MR materials are divided into 5 categories including MR fluid, MR grease, MR elastomer, MR gel and MR foam. They are different in terms of the physical appearances like liquid, semi-liquid, solid and semi-solid. Thus, the field-dependent properties of each MR material are different and application fields are specialized.

The followings are the topics proposed for this special issue (but not limited to):

  • Molecular model of MR materials
  • Modelling and simulation of MR materials behaviors
  • New formulation of MR materials
  • Materials selection of MR materials
  • Properties and characterization of MR materials
  • Design for manufacture of MR materials
  • Reliability of MR materials
  • MR materials based sensors and actuators
  • Potential applications of MR materials
  • Smart flexible structure based on MR materials

Prof. Dr. Seung-bok Choi
Guest Editor

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Keywords

  • Magnetorheological (MR) material
  • Molecular particles
  • Molecular model
  • Phenomenological model
  • Material characterization
  • MR sensors and actuators
  • Application devices
  • Smart flexible structure
  • MR fluid
  • MR grease
  • MR elastomer
  • MR gel
  • MR foam

Published Papers (3 papers)

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Research

Open AccessArticle
A Novel Hydraulic Actuation System Utilizing Magnetorheological Fluids for Single-Port Laparoscopic Surgery Applications
Materials 2020, 13(6), 1380; https://doi.org/10.3390/ma13061380 - 20 Mar 2020
Abstract
Single-port laparoscopic surgery (SLS), which utilizes one major incision, can deliver favorable cosmetic outcomes with fewer patient hospitalization stays and less postoperative pain. However, current SLS instruments, which are rigid and slender, have been suffering from several drawbacks, including their inability to provide [...] Read more.
Single-port laparoscopic surgery (SLS), which utilizes one major incision, can deliver favorable cosmetic outcomes with fewer patient hospitalization stays and less postoperative pain. However, current SLS instruments, which are rigid and slender, have been suffering from several drawbacks, including their inability to provide the optimum articulation required to complete certain SLS tasks. This paper reports on the development of a lightweight smart hydraulic actuation system that is proposed to be embedded at selected joints along current SLS instruments, in order to enhance their adaptability with a higher level of stiffness and degrees-of-freedom. The developed smart actuation system utilizes both conventional hydraulic and magnetorheological (MR) fluid actuation technologies. Electromagnetic finite element analyses were conducted to design the electromagnetic circuit of the smart actuator. A prototype of the developed actuation system was manufactured, and its performance was assessed using a dedicated experimental arrangement, which was found to agree well with the results obtained using a Bingham plastic theoretical model. Finally, the present design of the developed smart actuation system permits an angulation of about 90° and a maximum force output in excess of 100 N, generated under a magnetic excitation of about 1.2 Tesla, which should be sufficient to resist torques of up to 500 mNm. Full article
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Open AccessArticle
A Tactile Device Generating Repulsive Forces of Various Human Tissues Fabricated from Magnetic-Responsive Fluid in Porous Polyurethane
Materials 2020, 13(5), 1062; https://doi.org/10.3390/ma13051062 - 27 Feb 2020
Abstract
In this study, a controllable tactile device capable of realizing repulsive forces from soft human tissues was proposed, and its effectiveness was verified through experimental tests. The device was fabricated using both porous polyurethane foam (PPF) and smart magnetorheological fluid (MRF). As a [...] Read more.
In this study, a controllable tactile device capable of realizing repulsive forces from soft human tissues was proposed, and its effectiveness was verified through experimental tests. The device was fabricated using both porous polyurethane foam (PPF) and smart magnetorheological fluid (MRF). As a first step, the microstructural behavior of MRF particle chains that depended on the magnetic field was examined via scanning electron microscopy (SEM). The test samples were then fabricated after analyzing the magnetic field distribution, which was crucial for the formation of the particle chains under the squeeze mode operation. In the fabrication of the samples, MRF was immersed into the porous polyurethane foam and encapsulated by adhesive tape to avoid leakage. To verify the effectiveness of the proposed tactile device for appropriate stiffness of soft human tissues such as liver, the repulsive force and relaxation stress were measured and discussed as a function of the magnetic field intensity. In addition, the effectiveness and practical applicability of the proposed tactile device have been validated through the psychophysical test. Full article
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Open AccessArticle
Field-Dependent Stiffness of a Soft Structure Fabricated from Magnetic-Responsive Materials: Magnetorheological Elastomer and Fluid
Materials 2020, 13(4), 953; https://doi.org/10.3390/ma13040953 - 20 Feb 2020
Abstract
A very flexible structure with a tunable stiffness controlled by an external magnetic stimulus is presented. The proposed structure is fabricated using two magnetic-responsive materials, namely a magnetorheological elastomer (MRE) as a skin layer and a magnetorheological fluid (MRF) as a core to [...] Read more.
A very flexible structure with a tunable stiffness controlled by an external magnetic stimulus is presented. The proposed structure is fabricated using two magnetic-responsive materials, namely a magnetorheological elastomer (MRE) as a skin layer and a magnetorheological fluid (MRF) as a core to fill the void channels of the skin layer. After briefly describing the field-dependent material characteristics of the MRE and MRF, the fabrication procedures of the structure are provided in detail. The MRE skin layer is produced using a precise mold with rectangular void channels to hold the MRF. Two samples are produced, namely with and without MRF, to evaluate the stiffness change attributed to the MRF. A magnetic field is generated using two permanent magnets attached to a specialized jig in a universal tensile machine. The force-displacement relationship of the two samples are measured as a function of magnetic flux density. Stiffness change is analyzed at two different regions, namely a small and large deformation region. The sample with MRF exhibits much higher stiffness increases in the small deformation region than the sample without MRF. Furthermore, the stiffness of the sample with MRF also increases in the large deformation region, while the stiffness of the sample without MRF remains constant. The inherent and advantageous characteristics of the proposed structure are demonstrated through two conceptual applications, namely a haptic rollable keyboard and a smart braille watch. Full article
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