Magnetorheology for suspensions of solid particles dispersed in ferrofluids

López–López, Modesto T.; Kuzhir, Pavel; Lacis, S.; Bossis, Georges; González‐Caballero, F.; Durán, J.D.G.

doi:10.1088/0953-8984/18/38/s18

Cited by 104 publications

(83 citation statements)

References 26 publications

(33 reference statements)

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“…The magnetic-field-induced structural transformations are also observed in different soft magnetic systems [4,5]. As an example, in several recent works, attempts have been undertaken to create new liquid magnetizable composites based on ferrofluids that can more effectively interact with external magnetic fields [6][7][8]. In the present work we study magnetic and structural properties of new composite system which is a ferrofluid emulsion.…”

Section: Introductionmentioning

confidence: 93%

Drops deformation and magnetic permeability of a ferrofluid emulsion

Zakinyan

Dikansky

2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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To cite this version:Arthur Zakinyan, Yury Dikansky. Drops deformation and magnetic permeability of a ferrofluid emulsion. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2011, 380 (1- Abstract. In the paper the novel soft magnetic composite system is investigated. A ferrofluid emulsion studied demonstrates the strong magnetic properties which are atypical for commonly known emulsions. Interaction of ferrofluid emulsions with a magnetic field is considered. Structural transformations in these media, such as deformation of emulsion microdroplets and emulsion inversion, are studied. The changes in the relative permeability of emulsion associated with structural transformations are investigated. The theory of the observed phenomena is developed, and the feasibility of effectively controlling the magnetic properties of ferrofluid emulsions by applying a magnetic field is demonstrated.

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Section: Introductionmentioning

confidence: 93%

Drops deformation and magnetic permeability of a ferrofluid emulsion

Zakinyan

Dikansky

2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Also, the carrier fluids, although typically silicon or petroleum oils or other non-polar liquids [15][16][17][18], have been studied to a large extent [8], including ionic liquids [19][20][21][22], aqueous media [23,24] or even ferrofluids [4].…”

Section: Introductionmentioning

confidence: 99%

“…These include typically organic molecules in solution or adsorbed on the particles [8,23,[42][43][44][45], but the use of ionic liquids [21,22,46,47] or suspensions of nanoparticles (either magnetic or not) [4,[48][49][50][51] as carriers has also proven rather efficient in opposing aggregation and sedimentation on MRFs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and wear study of an extremely bidisperse magnetorheological fluid

Iglesias¹,

Ruiz-Morón²,

Durán³

et al. 2015

Smart Mater. Struct.

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HIGHLIGHTSFive magnetorheological fluids are tested for MR response, and wear and friction A standard four-ball method is used for wear testingThe bimodal (with a magnetite ferrofluid as base liquid) fluid displays the best MR performance both before and after testing Steel scratches are observed in fluids containing the iron particles in base oil, the effect being more important in absence of anti-wear additiveThe bimodal fluid produces a milder wear, at the price of a larger friction coefficient ABSTRACTIn this work the friction and wear properties of five magnetorheological (MR) fluids with varying compositions are investigated. Considering that many of the proposed applications for these fluids involve lubricated contact between mobile metal-metal or polymer-metal parts, the relationship between MR response and wear behavior appears of fundamental importance. One of the fluids (MR#1) contains only the iron microparticles and the base oil; the second and third ones (MR#2 and MR#3) contain an anti-wear additive as well. The fourth one (MR#4) is a well know commercial MR fluid. Finally, MR#5 is stabilized by dispersing the iron particles in a magnetite ferrofluid. The MR response of the latter fluid is better (higher yield stress and postyield viscosity) than that of the others. More important, it remains (and even improves) after the wear test: the pressure applied in the four-ball apparatus produces a compaction of the magnetite layer around the iron microparticles. Additionally, the friction coefficient is larger, which seems paradoxical in principle, but can be explained by considering the stability of MR#5 in comparison to the other four MRs, which appear to undergo partial phase separation during the test. In fact, electron and optical microscope observations confirm a milder wear effect of MR#5, with almost complete absence of scars from the steel test spheres and homogeneous and shallow 3 grooves on them. Comparatively, MR#2, MR#3 and, particularly, MR#1 produce a much more significant wear.

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“…in rotating seals or bearings [1,2] imposes severe requirements on dispersion/stabilization of magnetic nanoparticles in various organic carriers. Magnetic composite fluids, involving nanosized magnetite and several micron sized iron particles [3], with strongly bidisperse size distribution, develop higher yield stress [4] and better stability against sedimentation [5] as conventional magnetorheological (MR) fluids. Such type of nano-micro structured magnetizable fluids are envisaged beside high pressure magnetofluidic seals, also for MR clutches and brakes [6] capable of transferring controllable high torques with a fast response time in special hydraulic turbine designs, without introducing noise and vibrations.…”

Section: Introductionmentioning

confidence: 99%

Leakage-free Rotating Seal Systems with Magnetic Nanofluids and Magnetic Composite Fluids Designed for Various Applications

Borbáth¹,

Bica²,

Potencz³

et al. 2011

International Journal of Fluid Machinery and Systems

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Recent results are presented concerning the development of magnetofluidic leakage-free rotating seals for vacuum and high pressure gases, evidencing significant advantages compared to mechanical seals. The micro-pilot scale production of various types of magnetizable sealing fluids is shortly reviewed, in particular the main steps of the chemical synthesis of magnetic nanofluids and magnetic composite fluids with light hydrocarbon, mineral oil and synthetic oil carrier liquids. Design concepts and some constructive details of the magnetofluidic seals are discussed in order to obtain high sealing capacity. Different types of magnetofluidic sealing systems and applications are reviewed. Testing procedures and equipment are presented, as well as the sealing capabilities of different types of magnetizable fluids.

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Magnetorheology for suspensions of solid particles dispersed in ferrofluids

Cited by 104 publications

References 26 publications

Drops deformation and magnetic permeability of a ferrofluid emulsion

Drops deformation and magnetic permeability of a ferrofluid emulsion

Dynamic and wear study of an extremely bidisperse magnetorheological fluid

Leakage-free Rotating Seal Systems with Magnetic Nanofluids and Magnetic Composite Fluids Designed for Various Applications

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