The effect of magnetic particles covering the droplets on the heating rate of Pickering emulsions in the AC magnetic field

Bielas, Rafał; Hornowski, T.; Paulovičová, K.; Rajňák, Michal; Józefczak, Arkadiusz

doi:10.1016/j.molliq.2020.114388

Cited by 16 publications

(6 citation statements)

References 61 publications

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“…The way our samples cooled down depended strongly on the intensity of the AC magnetic field used for heating, on the size of magnetic particles and also on the solidity of the particle shell around Pickering droplets. The emulsions with droplets coated to a higher extent by magnetic particles have already been reported to exhibit weaker heating performance [20]. However, as shown in this work, they also cooled down slower compared to emulsions with poorly coated droplets.…”

Section: Discussionsupporting

confidence: 67%

“…In Figure 4a, the highest temperature increase after 30 s of heating was obtained for pre-emulsions under the magnetic field with an intensity of 16.2 kA/m. The fact that pre-emulsions exhibit better heating performance than emulsions was observed and discussed in our previous work [20]. For particles with a small magnetic core such as OA-MPs, the potential reason can be the inhibition of Brown relaxation when residing at the droplet interface.…”

Section: Temperature Increase and Decrease In Pre-emulsions And Stablmentioning

confidence: 77%

“…The heat generation under the AC magnetic field is due to the relaxation and hysteresis losses occurring in magnetic particles and is influenced by several factors such as particle size, intensity of the magnetic field used, viscosity of the hosting medium. In our previous work [20], we showed that also a specific arrangement of particles at the oil-oil interfaces may change the heating performance of emulsions. This change in our experiments is caused by electro-coalescence of emulsion droplets.…”

Section: Idea Of the Experimentsmentioning

confidence: 94%

“…In Figure 2, when the AC magnetic field (AMF) is on, the temperature around the droplets is different for the emulsion system with non-solid and more solid particle shells around droplets [20]. In both cases, the heat generated in magnetic particles is transferred into the droplet inside and from the droplet's surface, as shown schematically with red lines of various lengths.…”

Section: Idea Of the Experimentsmentioning

confidence: 99%

“…Three types of magnetic particles (MPs) were utilized in our experiments as stabilizers in magnetite-stabilized emulsions: magnetic microparticles with declared sizes of <5 µm (µMPs) purchased from Sigma-Aldrich, magnetic nanoparticles with sizes of 50-100 nm (nMPs) purchased from Sigma-Aldrich and magnetic nanoparticles with sizes of 10 nm (OA-MPs) synthesized in the process of co-precipitation and additionally functionalized with oleic acid as a surfactant as described in [20]. We prepared oil-in-oil emulsions where castor oil (MERLIN, MA 220-1) was the continuous phase and silicone oil (Rhodorsil oils 47 V 50) was the dispersed phase.…”

Section: Particles and Oilsmentioning

confidence: 99%

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The Effect of Particle Shell on Cooling Rates in Oil-in-Oil Magnetic Pickering Emulsions

Bielas

Józefczak

2020

Materials

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Pickering emulsions (particle-stabilized emulsions) are usually considered because of their unique properties compared to surfactant-stabilized emulsions including better stability against emulsion aging. However, the interesting feature of particle-stabilized emulsions could be revealed during their magnetic heating. When magnetic particles constitute a shell around droplets and the sample is placed in an alternating magnetic field, a temperature increase appears due to energy dissipation from magnetic relaxation and hysteresis within magnetic particles. We hypothesize that the solidity of the magnetic particle shell around droplets can influence the process of heat transfer from inside the droplet to the surrounding medium. In this way, particle-stabilized emulsions can be considered as materials with changeable heat transfer. We investigated macroscopically heating and cooling of oil-in-oil magnetic Pickering emulsions with merely packed particle layers and these with a stable particle shell. The change in stability of the shell was obtained here by using the coalescence of droplets under the electric field. The results from calorimetric measurements show that the presence of a stable particle shell caused a slower temperature decrease in samples, especially for lower intensities of the magnetic field. The retarded heat transfer from magnetic Pickering droplets can be utilized in further potential applications where delayed heat transfer is desirable.

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Section: Discussionsupporting

confidence: 67%

Section: Temperature Increase and Decrease In Pre-emulsions And Stablmentioning

confidence: 77%

Section: Idea Of the Experimentsmentioning

confidence: 94%

Section: Idea Of the Experimentsmentioning

confidence: 99%

Section: Particles and Oilsmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Particle Shell on Cooling Rates in Oil-in-Oil Magnetic Pickering Emulsions

Bielas

Józefczak

2020

Materials

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Pickering emulsion stabilized by lignin particles: Influence of oil phase, lignin concentration, and particle size

Pang,

Luo,

et al. 2024

Colloid Polym Sci

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Pickering emulsion stabilized by lignin particles has many advantages such as high exibility, natural non-toxicity, anti-oxidation and anti-ultraviolet. In order to promote the application of industrial lignin in the eld of Pickering emulsions, this study has done a comparatively systematic and basic research on Pickering emulsions stabilized by lignin particles. The emulsi cation effects of lignin particles on cyclohexane and n-decanol which have opposite polarity were compared rstly under different oil-water ratios. It was found that stable emulsions formed when the three-phase contact angle of oil/water/lignin was closer to 90°. The weakly polar cyclohexane could be well-emulsi ed by lignin particles, while the strong polar n-decanol could hardly be. Cyclohexane was used as the oil phase to discuss the emulsi cation ability of lignin particles under different concentration or with different particle size. The results show increasing the concentration of lignin particles or reducing the particle size can improve the emulsi cation performance.

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Rational design of PEGylated magnetite grafted on graphene oxide with effective heating efficiency for magnetic hyperthermia application

Patah

Abnisa

Daud

2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The effect of magnetic particles covering the droplets on the heating rate of Pickering emulsions in the AC magnetic field

Cited by 16 publications

References 61 publications

The Effect of Particle Shell on Cooling Rates in Oil-in-Oil Magnetic Pickering Emulsions

The Effect of Particle Shell on Cooling Rates in Oil-in-Oil Magnetic Pickering Emulsions

Pickering emulsion stabilized by lignin particles: Influence of oil phase, lignin concentration, and particle size

Rational design of PEGylated magnetite grafted on graphene oxide with effective heating efficiency for magnetic hyperthermia application

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