Enhanced Sedimentation Stability of Carbonyl Iron Powders with Hydrophilic Siloxane Polymer Coatings in Ethanol

Ha, Hong-Soo; Thompson, Russ; Hwang, Byungil

doi:10.1080/15440478.2023.2166648

Cited by 5 publications

(3 citation statements)

References 64 publications

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“…It is known that magnetic fillers embedded in soft materials with a uniform distribution are prone to exhibit consistent magnetic behavior. Nanoparticles easily aggregate, 33 while large-sized particles easily settle, 34 so we chose 1 mm as the particle size. To achieve the maximum range of magnetic responses, based on our previous work, 35 we have chosen a weight ratio of 1.5 : 1 and 3 : 2 for PDMS prepolymer and CIPs, respectively.…”

Section: Methodsmentioning

confidence: 99%

Adhesion performance of magnetically responsive surfaces under wet conditions

Qin,

Peng,

Sui

et al. 2024

Soft Matter

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Section: Methodsmentioning

confidence: 99%

Adhesion performance of magnetically responsive surfaces under wet conditions

Qin,

Peng,

Sui

et al. 2024

Soft Matter

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“…The inclusion of additives dies down the sedimentation rate very significantly as compared to the fluid having no additives. Hà et al [13] modify the surface of carbonyl iron powders (CIPs) with 3-aminopropyl triethoxysilane tetraethyl orthosilicate so as to enhance the sedimentation stability related to the suspensions, which do not make use of the harmful dispersants. The coated CIP surface improves the surface energy of used CIP powders.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological fluids: A comprehensive review

Chauhan,

Kumar,

Sham

2024

Manufacturing Rev.

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The magnetorheological (MR) fluids contain magnetic micro-sized iron particles, non-magnetic-based fluid, and some additives in order to mitigate sedimentation and agglomeration. The various carrier fluids used in the preparation of MR fluids are mineral oil, silicon oil, castor oil, soybean oil, kerosene, synthetic oils, honge oil, organic oil, water-based oils, etc. However, for obtaining better vibration control, silicone oil is the most preferred one due to its higher viscosity index, lower friction characteristics, higher flash point, and higher shear strength. The MR fluids have various application areas such as dampers, prosthetic knees, valves, brakes, clutches, finishing processes etc. The dampers containing MR fluids are used in automobile cushioning for enhancing passenger comfort and MR suspensions significantly improve steering stability in vehicles. In case of MR brakes, the braking torque on the rotating disks is controlled using the generated shear stress. The carbonyl iron (CI) particles exhibit better rheological characteristics as compared to electrolytic iron (EI) particles. The use of MR fluids produces stable and natural limb movement in orthoses, lower limb prostheses, and exoskeletons. The MR fluids also prove to be very significant in polishing applications. There are various issues with preparation methods and difficulties in the storage of MR fluids. The problems encountered in the synthesis of MR fluids include sedimentation, agglomeration, in-use thickening, corrosion, erosion, etc. The impact of particle proportion, particle shapes, and size has been influential in evaluating MR characteristics. The viscosity and shear stress of MR fluid have been mitigated at higher values of temperature and even CI particles get oxidized at higher temperatures. The CI particles as compared to EI particles are the majority favourable particles used for dispersing state within the MR fluids due to their higher value of saturation magnetization, more availability, and lesser cost. The small-sized particles led to lower wettability, whereas larger-sized particles accounted for an increased sedimentation rate. The currently available MR fluids cost is still on the higher side and the preparation of economical MR fluid is still a big challenge for the researchers. The MR fluids storage is also a big concern. The future scope of MR fluid may be in heavy industries such as nuclear, shipbuilding, oil and gas, space and aviation, etc. to achieve the desired damping response.

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“…Composed of soft magnetic micron particles and modified carrier liquids, MR fluids face a significant challenge in the form of density variation between individual particles and the carrier fluid, particularly in terms of sedimentation in their natural state. [15][16][17] To enhance sedimentation stability, numerous studies have attempted to reduce particle density or increase the contact area with the carrier liquid through surface treatment using active agents. However, such approaches often result in a lower dynamic yield strength of MR fluids and a reduced speed of response to applied magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Balanced Devil Triangle: A Satisfactory Comprehensive Performance Magnetorheological Fluids with Cross‐Scale Particles

Du,

Zhao,

Liu

et al. 2023

Adv Funct Materials

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Magnetorheological (MR) fluids are magnetic responsive smart materials that are widely used in real‐time damping adjustment devices. However, a major challenge for MR fluids is balancing the constraints relationship among various key performances. This study demonstrates that by utilizing home‐made high saturation magnetization (208.0 emu g−1) nanoparticles as the second component in the preparation of cross‐scale bidisperse MR fluids, the shortcomings of monodisperse micron particles performance can be compensated, effectively balancing the relationship between various performances. This is attributed to the fact that the addition of nanoparticles enhances the density of chain structures under an applied magnetic field, while reducing the overall particle density without a magnetic field. By replacing part of micron particles with nanoparticles, the phenomenon of significant increase in zero‐field viscosity caused by the direct introduction of nanoparticles is avoided. The optimal content of nanoparticles in MR fluids is preliminarily explored, and the results indicate that Micro‐Nano bidisperse MR fluids exhibit a high dynamic yield strength (58.3 kPa when 436 kA m−1), excellent sedimentation stability (82.6% when 7 days), suitable zero‐field viscosity (1.25 Pa s when 100 s−1), and ideal reversibility. Most importantly, the simple preparation method adds significant engineering application value to these MR fluids.

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Enhanced Sedimentation Stability of Carbonyl Iron Powders with Hydrophilic Siloxane Polymer Coatings in Ethanol

Cited by 5 publications

References 64 publications

Adhesion performance of magnetically responsive surfaces under wet conditions

Adhesion performance of magnetically responsive surfaces under wet conditions

Magnetorheological fluids: A comprehensive review

Balanced Devil Triangle: A Satisfactory Comprehensive Performance Magnetorheological Fluids with Cross‐Scale Particles

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