Enhanced magnetic response of fluids using self-assembled petal-like iron oxide particles

Son, You-Hwan; Lee, Jung‐Kun; Soong, Yee; Martello, Donald V.; Chyu, Minking K.

doi:10.1063/1.3371713

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…Coercive field of the composite material in an inset of Fig. 7 is almost zero, which agrees well with a well-known very small coercive field of the magnetite nanoparticles [ 29 , 30 ]. These small coercive field and remnant magnetization are due to the size of magnetic nanoparticles that exhibit superparamagnetism.…”

Section: Resultssupporting

confidence: 87%

“…In this study, the magnetorheological properties of the fluid were measured while the fluid was in an oscillating motion. This oscillatory technique is widely used in characterizing the viscoelastic properties of fluid systems [ 29 , 31 – 33 ]. An oscillation frequency is fixed at ω = 5 rad s −1 , and a sweeping strain ranged from 0.01 to 100%.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced viscoelastic property of iron oxide nanoparticle decorated organoclay fluid under magnetic field

et al. 2017

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Stable hydrophobic nanocomposites of magnetic nanoparticles and clay are prepared by the self-assembly of magnetite (Fe3O4) nanoparticles on surfaces of exfoliated clay platelets. Due to the attractive interaction between hydrophobic groups, oleic acid coated nanoparticles are strongly attached to the surface of cetyl trimethylammonium cation coated clay platelets in organic media. Crystal structure and magnetic property of composite particles are examined using electron microscopy, x-ray diffractometer and vibration sample magnetometer. In addition, composite particles are dispersed in mineral oil and rheological properties of composite particle suspensions are characterized using steady-state and oscillatory measurements. Magnetite nanoparticle decorated organoclay forms a tunable network in mineral oil. When a magnetic field is applied, the composite particle fluid exhibits higher storage modulus and maintains a solid-like property at larger strain. Our results show that the viscoelastic property of the magnetite nanoparticle decorated organoclay fluid is controlled by applying external magnetic field.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Enhanced viscoelastic property of iron oxide nanoparticle decorated organoclay fluid under magnetic field

et al. 2017

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“…The microparticles used are based mainly on Fe-Co, Fe-Ni, FeCrP [57] and CI, in addition to iron oxides [58][59][60]. Among these, an excellent MR fluid candidate, CI particle, is used widely adopted owing to its high saturation magnetization and appropriate particle size.…”

Section: Mr Suspensionsmentioning

confidence: 99%

Physical characteristics of magnetorheological suspensions and their applications

Bîcă¹,

Liu²,

Choi³

2013

Journal of Industrial and Engineering Chemistry

174

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“…However, there are still a few experimental studies dedicated to these contributions. For instance, Son et al have focused on the surface morphology effect of magnetic response and ascribed their larger magnetic response to the “petal‐like morphology” of the particles and the concomitant interparticle friction . Vereda et al have confirmed that the particle porosity is an important factor in MR fluids and should be considered in their design and modeling .…”

Section: Introductionmentioning

confidence: 99%

Elegant Surface of CoNi Alloys toward Efficient Magnetorheological Performances Realized with Carbon Quantum Dots

Zhang

Tian

et al. 2018

Adv Materials Inter

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of superwetting surfaces. [3,4] Up to now, many methods have been developed to produce superhydrophobic surface via creating rough structures or attaching small particles on the surface through various strategies. [5][6][7] Nowadays, transition metals cobalt (Co) and nickel (Ni) and their bimetallic alloys are of great interest on account of their unique and desirable properties, such as high values of saturation magnetization (M s ), excellent mechanical strength, and facile synthesis routes. [8,9] The CoNi alloys have been used in many fields, such as catalysis, microwave absorption, biomedical devices, and magnetic resonance imaging. [10][11][12] In general, the applications of CoNi alloys depend on two factors: chemical composition and morphology, which determine their intrinsic magnetic moment, magnetic permeability, and wettability. In general, Co-rich CoNi alloys possess high values of M s . Stimuli control of magnetic particles is a challenge for basic research, whereas it is a promising way for advanced applications. In contrast to conventional carbonyl iron particles, Co, Ni, and their bimetallic alloys provide a viable alternative for magnetorheological (MR) materials owning to their high values of M s and good controllability for their morphology.MR fluids are a kind of intelligent materials, which usually consist of micrometer-sized magnetizable particles dispersed in a liquid media. [13][14][15] When exposed to an external magnetic field, the dispersed particles get magnetized and develop magnetic moments, which give rise to strong magnetostatic attraction between adjacent particles and consequently build up aligned fiber-like structures. [15,16] The resulting field-induced structures hinder the free flow of the former Newtonian fluid, and high values of the yield stress and viscosity are observed, which is called MR effect. [17] Applications based on MR fluids, such as couplings, actuators, clutches, and vibration dampers, employ the shearing and squeezing strength of MR fluids. [18][19][20] The hottest topics on MR fluids are finding ways to improve their yield stress, stability upon settling, and activity over a wide temperature range. Current fundamental research on MR fluids mainly focuses on the alleviation of settling issues for MR suspensions, which may restrict their use in practical applications. To achieve this goal, several promising strategies Designing and fabricating a rational surface architecture is one of the critical factors to achieve desirable physical and chemical properties and still remains an immense challenge. Herein, a series of CoNi-based hierarchical microspheres with different surface morphologies, including litchi-like, seed-of-plane-tree-like, and waxberry-like shapes, are obtained via surface nucleation of carbon quantum dots (CQDs) with different concentrations in liquid polyol. Microstructure investigations suggest that all the CoNi microspheres are uniformly with enhanced surface roughness with the increasing concentration of CQDs. This study provides insight into...

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Enhanced magnetic response of fluids using self-assembled petal-like iron oxide particles

Abstract: Magnetically tunable self-assembly of colloidal rings Appl. Phys. Lett. 97, 083105 (2010); 10.1063/1.3483137Investigation on configuration of self-assembly in magnetic fluid film under a magnetic field

Cited by 10 publications

References 18 publications

Enhanced viscoelastic property of iron oxide nanoparticle decorated organoclay fluid under magnetic field

Enhanced viscoelastic property of iron oxide nanoparticle decorated organoclay fluid under magnetic field

Physical characteristics of magnetorheological suspensions and their applications

Elegant Surface of CoNi Alloys toward Efficient Magnetorheological Performances Realized with Carbon Quantum Dots

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