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The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases

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 de...

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Autores principales: Mohamad, Norzilawati, Ubaidillah, Mazlan, Saiful Amri, Choi, Seung-bok, Abdul Aziz, Siti Aishah, Sugimoto, Masataka
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479971/
https://www.ncbi.nlm.nih.gov/pubmed/30934679
http://dx.doi.org/10.3390/ijms20071525
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author Mohamad, Norzilawati
Ubaidillah,
Mazlan, Saiful Amri
Choi, Seung-bok
Abdul Aziz, Siti Aishah
Sugimoto, Masataka
author_facet Mohamad, Norzilawati
Ubaidillah,
Mazlan, Saiful Amri
Choi, Seung-bok
Abdul Aziz, Siti Aishah
Sugimoto, Masataka
author_sort Mohamad, Norzilawati
collection PubMed
description 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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spelling pubmed-64799712019-04-29 The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases Mohamad, Norzilawati Ubaidillah, Mazlan, Saiful Amri Choi, Seung-bok Abdul Aziz, Siti Aishah Sugimoto, Masataka Int J Mol Sci Article 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. MDPI 2019-03-27 /pmc/articles/PMC6479971/ /pubmed/30934679 http://dx.doi.org/10.3390/ijms20071525 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mohamad, Norzilawati
Ubaidillah,
Mazlan, Saiful Amri
Choi, Seung-bok
Abdul Aziz, Siti Aishah
Sugimoto, Masataka
The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title_full The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title_fullStr The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title_full_unstemmed The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title_short The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases
title_sort effect of particle shapes on the field-dependent rheological properties of magnetorheological greases
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479971/
https://www.ncbi.nlm.nih.gov/pubmed/30934679
http://dx.doi.org/10.3390/ijms20071525
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