Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles

Mohapatra, Dillip Kumar; Camp, Philip J.; Philip, John

doi:10.1039/d1na00131k

Cited by 15 publications

(12 citation statements)

References 86 publications

(133 reference statements)

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“…[37] When temperature and pH are increased, a redox reaction occurs, leading to the formation of nucleation sites and the growth of Fe 3 O 4 on the graphene sheets. [38,39] TA serves as a stabilizer, chelating agent, and reducing agent in the preparation of hybrid NMFs through the chemical reduction of GO, as depicted in Figure 2(i). The morphology and structure of the resulting rGO-Fe 3 O 4 nanocomposite were analyzed by Sadeghinezhad et al using transmission electron microscopy (TEM).…”

Section: Background and Literature Reviewmentioning

confidence: 99%

“…. [39] In NMFs, polydispersity is inevitable, and the average particle size of MNPs in NMFs can vary. Obtaining monodisperse MNPs based NMFs is practically impossible due to the inherent particle size distribution, which leads to variations in dipolar interaction strengths.…”

Section: Dipole-dipole Interactionmentioning

confidence: 99%

“…Through linear regression analysis of magnetization curves up to 10mT, the initial susceptibility values were experimentally determined to be ≈5.6, 6.4, and 7.4 for the samples labeled as M1, M2, and M3, respectively. To understand polydispersity, Mahopatra et al [39] experimentally demonstrated the effect of particle size on tunable structures under the influence of an external magnetic field. Three separate polydisperse samples with variable particle sizes were used to calculate the different coupling constants, which are given by 𝜆 SS , 𝜆 LS , and 𝜆 LL .…”

Section: Dipole-dipole Interactionmentioning

confidence: 99%

“…[33][34][35][36] NMFs' TC varies under magnetic fields, dependent on parameters such as particle size, volume concentration, base fluids, pH, and magnetic field strength. [37][38][39] This review aims to establish correlations between these factors, with limited analytical correlations thus far. TC enhancement in NMFs is due to the alignment of MNPs' in the applied field direction, forming a bridge for thermal energy transport via phonon and thermo-magnetic convection.…”

Section: Introductionmentioning

confidence: 99%

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Correlating the Dipolar Interactions Induced Magneto‐Viscoelasticity and Thermal Conductivity Enhancements in Nanomagnetic Fluids

Singh

Pathak

Jain

et al. 2023

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The effective thermal management of electronic system holds the key to maximize their performance. The recent miniaturization trends require a cooling system with high heat flux capacity, localized cooling, and active control. Nanomagnetic fluids (NMFs) based cooling systems have the ability to meet the current demand of the cooling system for the miniaturized electronic system. However, the thermal characteristics of NMFs have a long way to go before the internal mechanisms are well understood. This review mainly focuses on the three aspects to establish a correlation between the thermal and rheological properties of the NMFs. First, the background, stability, and factors affecting the properties of the NMFs are discussed. Second, the ferrohydrodynamic equations are introduced for the NMFs to explain the rheological behavior and relaxation mechanism. Finally, different theoretical and experimental models are summarized that explain the thermal characteristics of the NMFs. Thermal characteristics of the NMFs are significantly affected by the morphology and composition of the magnetic nanoparticles (MNPs) in NMFs as well as the type of carrier liquids and surface functionalization that also influences the rheological properties. Thus, understanding the correlation between the thermal characteristics of the NMFs and rheological properties helps develop cooling systems with improved performance.

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Section: Background and Literature Reviewmentioning

confidence: 99%

Section: Dipole-dipole Interactionmentioning

confidence: 99%

Section: Dipole-dipole Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlating the Dipolar Interactions Induced Magneto‐Viscoelasticity and Thermal Conductivity Enhancements in Nanomagnetic Fluids

Singh

Pathak

Jain

et al. 2023

Small

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“…This sample had a higher value of Hc, this is likely due to the crystallite agglomeration. And another ter, such as polydispersity indices 22) helps analyze the dispersity of COOH-Fe 3 O 4 crystallites. In contrast, the edgeto-edge separation of Fe 3 O 4 crystallites for CA/Fe = 1.5 (8.2 nm) was larger than that for CA/Fe = 1.…”

Section: Jcs-japanmentioning

confidence: 99%

Effect of citric acid content on magnetic property of magnetite particles for detecting virus

Hashimoto

Takahashi

Kikuchi

et al. 2022

J. Ceram. Soc. Japan

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The magnetic particles with high saturation magnetization and superparamagnetism are needed to detect highly sensitive viruses. The magnetic property of magnetite (Fe 3 O 4 ) particles synthesized by spray pyrolysis and a subsequent heating process depended on the citric acid content. The magnetic particles consist of nano-sized Fe 3 O 4 crystallite about 10 nm in diameter and the decomposed C with high dispersion. The edge-to-edge separation of the crystallites is about 8 nm. As a result, the superparamagnetic Fe 3 O 4 particles can be synthesized. The saturation magnetization of the synthesized beads (51 A•m 2 kg ¹1 ) is much higher than that of commercial magnetic microbeads (17 A•m 2 kg ¹1 ), and the coercive force is 0.24 kA m ¹1 . Superparamagnetism can likely be attained because of the high dispersion of Fe 3 O 4 crystallites below 10 nm in diameter. The Fe 3 O 4 crystallites did not magnetically interact with each other. These unique Fe 3 O 4 particles may hold promise as magnetic particles for enzyme immobilization due to the high possibility of antibody bonding and the ease of separation by magnetic fields.

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Study on the mechanism of modified surface and magnetic nanofluids on cooling performance of wireless charging equipment under magnetic field

Wang

Zhao

et al. 2022

Applied Thermal Engineering

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Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles

Abstract: (Top) Phase contrast optical microscopy images of field-induced microstructures in a polydisperse system at different out-of-plane magnetic field strengths. (Bottom) Scattered light intensity pattern of the structures.

Cited by 15 publications

References 86 publications

Correlating the Dipolar Interactions Induced Magneto‐Viscoelasticity and Thermal Conductivity Enhancements in Nanomagnetic Fluids

Correlating the Dipolar Interactions Induced Magneto‐Viscoelasticity and Thermal Conductivity Enhancements in Nanomagnetic Fluids

Effect of citric acid content on magnetic property of magnetite particles for detecting virus

Study on the mechanism of modified surface and magnetic nanofluids on cooling performance of wireless charging equipment under magnetic field

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