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

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

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 10320

Special Issue Editor

Prof. Dr. Seung-bok Choi

E-Mail Website
Guest Editor
Department of Mechanical Engineering, The State University of New York at Korea (SUNY Korea), 119 Songdo Moonhwa-Ro, Yeonsu-Gu, Incheon 21985, 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
Special Issues, Collections and Topics in MDPI journals

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

You may choose our Joint Special Issue in International Journal of Molecular Sciences.

Prof. Dr. Seung-bok Choi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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

13 pages, 4009 KiB  
Article
A Novel Hydraulic Actuation System Utilizing Magnetorheological Fluids for Single-Port Laparoscopic Surgery Applications
by Ali K. El Wahed
Materials 2020, 13(6), 1380; https://doi.org/10.3390/ma13061380 - 20 Mar 2020
Cited by 6 | Viewed by 4290
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
(This article belongs to the Special Issue Magnetic-Responsive Molecular Particles Based Smart Materials: Model, Characterization and Applications)
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14 pages, 4551 KiB  
Article
A Tactile Device Generating Repulsive Forces of Various Human Tissues Fabricated from Magnetic-Responsive Fluid in Porous Polyurethane
by Yu-Jin Park, Ji-Young Yoon, Byung-Hyuk Kang, Gi-Woo Kim and Seung-Bok Choi
Materials 2020, 13(5), 1062; https://doi.org/10.3390/ma13051062 - 27 Feb 2020
Cited by 12 | Viewed by 2736
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
(This article belongs to the Special Issue Magnetic-Responsive Molecular Particles Based Smart Materials: Model, Characterization and Applications)
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15 pages, 7387 KiB  
Article
Field-Dependent Stiffness of a Soft Structure Fabricated from Magnetic-Responsive Materials: Magnetorheological Elastomer and Fluid
by Byung-Keun Song, Ji-Young Yoon, Seong-Woo Hong and Seung-Bok Choi
Materials 2020, 13(4), 953; https://doi.org/10.3390/ma13040953 - 20 Feb 2020
Cited by 11 | Viewed by 2718
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
(This article belongs to the Special Issue Magnetic-Responsive Molecular Particles Based Smart Materials: Model, Characterization and Applications)
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