Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

Fu, Yu; Yao, Jianjun; Zhao, Honghao; Zhao, Gang; Wan, Zhenshuai; Qiu, Ying

doi:10.3390/nano8090714

Cited by 19 publications

(12 citation statements)

References 36 publications

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“…While the CI particles do not exhibit any characteristic peaks in the measured region, suppressed peaks determining the presence of gelatine in the spectrum of the CI ER-gelatine particles can be found in the inset. The inset shows the peaks at 1647 and 1524 cm −1 , which represent C = O and –NH– bending [ 13 , 28 , 29 ], respectively. Furthermore, the peak at 869 cm −1 denotes –C-–N– group and the one at 783 cm −1 represents the NH group from the –CONH– cis conformation, which are typical groups observed for gelatine.…”

Section: Resultsmentioning

confidence: 99%

“…[ 11 , 12 ], have been used as shells on magnetic particles in order to increase their biocompatibility. Gelatine has also been intensively investigated as a shell material for the coating of magnetic particles [ 13 , 14 , 15 , 16 ] in order to provide a biocompatible shell that can be further functionalized with bioactive substances. Such materials can be further used for in vivo applications such as magnetic separation, controlled drug delivery, embolization of a blood vessel, or arterial embolization hyperthermia, etc.…”

Section: Introductionmentioning

confidence: 99%

“…This study concerns a new method of coating commercial CI magnetic particles with biocompatible gelatine, which has previously been introduced to the surface of CI particles as a grafting agent to further modify the surface with graphite oxide [ 13 ] or carbon nanotubes [ 22 ]. In this study, composite particles CI/gelatine were used as the dispersed phase for a MR suspension, and their ability to form stiff structures within the liquid medium, simulating in vivo conditions, was examined.…”

Section: Introductionmentioning

confidence: 99%

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Gelatine-Coated Carbonyl Iron Particles and Their Utilization in Magnetorheological Suspensions

2021

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This study demonstrates the formation of biocompatible magnetic particles into organized structures upon the application of an external magnetic field. The capability to create the structures was examined in silicone-oil suspensions and in a gelatine solution, which is commonly used as a blood plasma expander. Firstly, the carbonyl iron particles were successfully coated with gelatine, mixed with a liquid medium in order to form a magnetorheological suspension, and subsequently the possibility of controlling their rheological parameters via a magnetic field was observed using a rotational rheometer with an external magnetic cell. Scanning electron microscopy, infrared spectroscopy, and thermogravimetric analysis confirmed the successful coating process. The prepared magnetorheological suspensions exhibited a transition from pseudoplastic to Bingham behavior, which confirms their capability to create chain-like structures upon application of a magnetic field, which thus prevents the liquid medium from flowing. The observed dynamic yield stresses were calculated using Robertson–Stiff model, which fit the flow curves of the prepared magnetorheological suspensions well.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gelatine-Coated Carbonyl Iron Particles and Their Utilization in Magnetorheological Suspensions

2021

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“…Fu et al [ 93 ] prepared GO wrapped around gelatin (G)‐coated CI and Fe 3 O 4 nanoparticles (CI/Fe 3 O 4 /G/GO) for MRFs. Pure CI, CI, and Fe 3 O 4 coated with G (CI/Fe 3 O 4 /G), G‐coated CI (CI/G) particles, and CI/Fe 3 O 4 /G/GO were dispersed in polyolefinic synthetic oil.…”

Section: Coated Ci‐based Mrfsmentioning

confidence: 99%

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Thiagarajan

Koh

2021

Adv Eng Mater

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Magnetorheological fluids (MRFs) are functional materials, prepared by dispersing magnetic particles in a nonmagnetic carrier fluid, that exhibit a change in mechanical properties (e.g., increase in viscosity and yield stress) when subjected to a magnetic field. Change in mechanical properties is demonstrated by a fast (i.e., fraction of milliseconds) and reversible transition from a liquid‐ to a solid‐like state. This transition, due to a structural reorganization of magnetic particles in the carrier fluid, makes MRFs a valuable material for damping, breaking systems, medical and prosthetics, and robotics. Since the discovery of MRFs in 1948, developing MRF preparation methods that result in improved performance and the storage without oxidation and settling is paramount. This article presents a review on recent developments in the preparation process of MRFs with a special emphasis on the state of the art in additives and coatings used in enhancing MRF chemical, colloidal, and thermal stability. Recent advances in MRF materials and formulations that have increased yield stress and magnetic properties are discussed. Finally, this review analyses the present‐day challenges in MRF research and makes suggestions for the field to improve MRF stability and performance drawing on previous MRF work and work outside of the fields.

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“…Fu et al[61] used complex core/shell structure particles. After applying a functional coating process composed of gelatin and graphite oxide (GO) to the surfaces of the micron-sized CI and nanoparticles Fe 3 O 4 , MR properties of the complex particle suspension was investigated.…”

mentioning

confidence: 99%

Core–shell-structured Fe3O4 nanocomposite particles for high-performance/stable magnetorheological fluids: preparation and characteristics

Seo

Choi

2020

J. Korean Ceram. Soc.

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Magnetorheological (MR) fluids are a type of smart material of which rheological properties can be controlled through mesostructural transformations. They are generally magnetically responsive particle suspensions, which consist of magnetizable particles dispersed in a non-magnetic liquid medium. Ferromagnetic or ferrimagnetic particles with a micrometer size are suitable for MR fluid suspensions, since they can be polarized by the external magnetic field to form chain-like aggregates (mesostructures) that have a strong yield strength and can induce a high shear viscosity. Fe 3 O 4 particles are good candidates for high-performance MR materials due to their low density and high magnetic properties as well as their excellent surface activities. To improve the stability of the MR suspension, many studies on the synthesis of Fe 3 O 4 -containing nanocomposites have been carried out recently. This review deals with the latest advances in the fabrication of Fe 3 O 4 nanocomposite particles with a core-shell structure as well as their critical characteristics and advantages to be used in MR suspensions. We focused on the synthesis strategy of various Fe 3 O 4 nanoparticles with a core-shell structure as well as their performance in the magnetic fields.

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Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

Cited by 19 publications

References 36 publications

Gelatine-Coated Carbonyl Iron Particles and Their Utilization in Magnetorheological Suspensions

Gelatine-Coated Carbonyl Iron Particles and Their Utilization in Magnetorheological Suspensions

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Core–shell-structured Fe3O4 nanocomposite particles for high-performance/stable magnetorheological fluids: preparation and characteristics

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