Suspension rheology of polyaniline coated manganese ferrite particles under electric/magnetic fields

Jeong, Ji Yoon; Kim, Sangwon; Baek, Eunchong; You, Chun‐Yeol; Choi, Hyoung Jin

doi:10.1016/j.colsurfa.2022.130438

Cited by 4 publications

(2 citation statements)

References 55 publications

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“…Also, PAn derivatives poly(N-methyl aniline) [124] and poly (diphenylamine) [125] were also reported to be as a shell layer on magnetic ZnFe 2 O 4 particles without any requirement of an additional de-doping process. PAn-coated spherical MnFe 2 O 4 nanoparticles were reported with dual characteristics of ER/MR fluids [127].…”

Section: Development and Diversification Of Polyaniline-based Mr Fluidsmentioning

confidence: 99%

Recent Developments in the Use of Polyaniline-Based Materials for Electric and Magnetic Field Responsive Smart Fluids

Erol

2023

Trends and Developments in Modern Applications of Polyaniline

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Smart fluids are stimuli-responsive materials whose rheological properties can be changed drastically by applying either an external electric or magnetic field strength. Smart fluids are dispersions comprised of dispersed particles in a carrier liquid that transform from liquid-like state to solid-like state within milliseconds reversibly with an application of external field due to the structural chain formation of the dispersed particles. Owing to this outstanding controllable transformation capability, smart fluids are utilized in various potential applications where an electro/magneto-mechanical interface is required, such as dampers, clutches, shock absorbers, robotics, haptic devices, microfluidics, etc. Various kinds of materials have been proposed and used by researchers for applications that require the electrorheological (ER) and magnetorheological (MR) effects. Polyaniline (PAn) is considered a remarkable material as a dispersed phase of ER fluids due to its easy synthesis, low cost, adjustable conductivity through doping/de-doping processes, and excellent environmental stability. PAn is an attractive material in MR fluids as well due to its contribution to the improvement of dispersion stability and protection against corrosion and oxidation of the soft-magnetic particles. In this chapter, the recent advances in the usage of various kinds of PAn-based materials as electric and magnetic field responsive materials and their ER/MR behaviors are summarized.

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Section: Development and Diversification Of Polyaniline-based Mr Fluidsmentioning

confidence: 99%

Recent Developments in the Use of Polyaniline-Based Materials for Electric and Magnetic Field Responsive Smart Fluids

Erol

2023

Trends and Developments in Modern Applications of Polyaniline

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“…The formation of a magnetic field in magnetorheological fluids results in the formation of a chain structure of nanoparticles in a relatively short period, causing the viscosity of the fluid to alter. When the magnetic field is removed, these chains vanish, causing the rheological behavior to revert to its original condition 7 . Recently, many efforts have been made to explore the heating of magnetic nanoparticle-containing dispersions in an alternating magnetic field as well as the prevailing process and it has shown that relaxation mechanisms generate more heat than hysteresis mechanisms 8 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of stable colloidal dispersion of surface modified Fe3O4 nanoparticles for magnetic heating applications

Sabzi Dizajyekan,

Jafari,

Vafaie-Sefti

et al. 2024

Sci Rep

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The effect of surface modification on enhancing the magnetic heating behavior of magnetic nano fluids were investigated, for this purpose Fe3O4 nanoparticles were synthesized using co-precipitation method and surface modification was done using citric acid, ascorbic acid, tetraethyl orthosilicate (TEOS), polyvinyl alcohol (PVA) and polyethylene glycol (PEG). Experimental heating tests using AC magnetic field were done in the frequency of 100 kHz and different magnetic field (H) intensities. Theoretically the specific absorption rate (SAR) in magnetic nano fluids is independent of nanoparticles concentration but the experimental results showed different behavior. The theoretical SAR value @ H = 12kA.m–1 for Nano fluids containing bare Fe3O4 nanoparticles was 11.5 W/g but in experimental tests the obtained value was 9.72 W/g for nano fluid containing 20,000 ppm of dispersed nanoparticles. The experimental SAR calculation was repeated for sample containing 10,000 ppm of nanoparticles and the results showed increase in experimental SAR that is an evidence of nanoparticles agglomeration in higher concentrations. The surface modification has improved the dispersion ability of the nanoparticles. The Ratio of SAR, experimental, 20000ppm to SAR, experimental, 10000ppm was 0.85 for bare Fe3O4 nanoparticles dispersion but in case of surface modified nanoparticles this ratio has increased up to 0.98 that shows lower agglomeration of nanoparticles as a result of surface modification, although on the other hand the surface modification agents were magnetically passive and so it is expected that in constant concentration the SAR for bare Fe3O4 nanoparticles to be higher than this variable for surface modified nanoparticles. At lower concentrations the dispersions containing bare Fe3O4 nanoparticles showed higher SAR values but at higher concentrations the surface modified Fe3O4 nanoparticles showed better results although the active agent amount was lower at them. Finally, it should be noted that the nanoparticles that were surface modified using polymeric agents showed the highest decrease in experimental SAR amounts comparing theoretical results that was because of the large molecules of polymers comparing other implemented surface modification agents.

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Electrorheological fluids: A living review

Munteanu,

Sedlacik

2025

Progress in Materials Science

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Suspension rheology of polyaniline coated manganese ferrite particles under electric/magnetic fields

Cited by 4 publications

References 55 publications

Recent Developments in the Use of Polyaniline-Based Materials for Electric and Magnetic Field Responsive Smart Fluids

Recent Developments in the Use of Polyaniline-Based Materials for Electric and Magnetic Field Responsive Smart Fluids

Preparation of stable colloidal dispersion of surface modified Fe3O4 nanoparticles for magnetic heating applications

Electrorheological fluids: A living review

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