Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix

Andrade, Vivian M.; Barroca, Nathalie; Pires, Ana L.; Belo, João H.; Pereira, A. M.; Pirota, K. R.; Araújo, João P.

doi:10.1016/j.matdes.2019.108354

Cited by 9 publications

(4 citation statements)

References 66 publications

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“…on near-room-temperature working MC materials for this review article [146][147][148][149][150]. Gd, or Gadolinium, is the representative material for a room-temperature MC material because it has a high magnetocaloric effect of 7.6 μ B per atom near room temperature (since Curie temperature of Gd is 294 K).…”

Section: Magnetocaloric-based Thermal Managementmentioning

confidence: 99%

Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

Jung,

Kim,

Kim

et al. 2023

Nano-Micro Lett.

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HIGHLIGHTS• This article systematically reviews the thermal management wearables with a specific emphasis on materials and strategies to regulate the human body temperature.• Thermal management wearables are subdivided into the active and passive thermal managing methods.• The strength and weakness of each thermal regulatory wearables are discussed in details from the view point of practical usage in real-life.

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Section: Magnetocaloric-based Thermal Managementmentioning

confidence: 99%

Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

Jung,

Kim,

Kim

et al. 2023

Nano-Micro Lett.

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“…A similar trend is reported for different polymer nanocompo- sites. 37,38 Moreover, this interaction moderately adjusts the divalent (Zn 2+ , Cu 2+ ) and trivalent (Fe 3+ ) cation distributions, the lattice constant, and oxygen position parameter compared to the pure ZCF NPs. On the other hand, the crystallite size and lattice parameter "a" and "b" values of PVDF-HFP increase upon composite formation by retaining the same "c" value (see Table 1 and Supporting Information Tables S1− S4).…”

Section: Structural Analysismentioning

confidence: 99%

Multiferroic Electroactive Polymer Blend/Ferrite Nanocomposite Flexible Films for Cooling Devices

Prabhakaran

Aepuru

Béron

et al. 2023

ACS Appl. Polym. Mater.

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In recent days, the interest toward the development of multicaloric materials for cooling application is increasing, whereas multiferroic materials would be the suitable alternative to the conventional refrigerants. To explore them, the poly(methyl methacrylate)/poly(vinylidenefluoride-co-hexafluoropropylene) (PMMA/PVDF-HFP) blend and PMMA/PVDF-HFP/Zn0.5Cu0.5Fe2O4 flexible multiferroic nanocomposite films were fabricated by the solution casting method. The structural analyses prove that the strong interfacial interaction between the PMMA/PVDF-HFP blend and the Zn0.5Cu0.5Fe2O4 (ZCF) through hydroxyl (−OH) and carbonyl group bonding with PVDF-HFP enhanced the thermal stability and suppressed the electroactive β phase from 67 to 62%. Experimental results show that 10 wt % of superparamagnetic ZCF nanoparticles with a particle size of 6.8 nm induced both the magnetocaloric and magnetoelectric effects in a nonmagnetic PMMA/PVDF-HFP ferroelectric matrix at room temperature. A set of isothermal magnetization curves were recorded in the magnetic field strength of 0–40 kOe and a temperature range of 2–400 K. The maximum magnetic entropy changes (ΔS M) of −0.69 J·kg–1 K–1 of ZCF nanoparticles and −0.094 J·kg–1 K–1 of PMMA/PVDF-HFP/ZCF nanocomposites showed an interesting table-like flat variation in the temperature range of 100–400 K as a function of the magnetic field. The samples display a large temperature span with a relative cooling power of 293 and 40 J·kg–1 for ZCF and PMMA/PVDF-HFP/ZCF, respectively. The magnetoelectric effect of the PMMA/PVDF-HFP/ZCF composite was proved, but it generated only 1.42 mV/m·Oe in the applied field of 5 kOe. Hence, the entropy change of the present nanocomposite was only due to the magnetocaloric effect, where the magnetoelectric cross-coupling coefficient was negligible. The multicaloric effect could be established if the nanocomposite showed a larger magnetoelectric cross-coupling in addition to the magnetocaloric effect. This approach provides the research findings in functional multiferroic polymer nanocomposites for miniaturized cooling devices.

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“…A review of the anticipated applications for magnetocaloric systems suggests that lightness (or portability), mechanical and chemical stability, flexibility, ease of processing, and tunable geometries are key properties that will facilitate implementing these materials in real life refrigerators and waste heat energy harvester devices. − …”

Section: Introductionmentioning

confidence: 99%

“…Typically, researchers employ either a top-down or bottom-up approach. The design of polymeric composite films with magnetocaloric inclusions using solvent-casting techniques has led to promising results. , In particular, an interesting report on magnetocaloric microparticles embedded in the poly(methyl methacrylate) matrix showed that the thermoplastic polymer could affect the particles, acting as a pressure cell and leading to a reduction of the magnetocaloric effect of the system . Concerning polymers, poly(vinylidene fluoride) (PVDF) is a well-known EA polymer that has different crystallographic phases (α, β, γ, δ, and ε) influenced by C–H–F formation .…”

Section: Introductionmentioning

confidence: 99%

Flexible Magnetocaloric Fiber Mats for Room-Temperature Energy Applications

Bayzi Isfahani,

Coondoo,

Bdikin

et al. 2024

ACS Appl. Mater. Interfaces

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Currently, magnetocaloric refrigeration technologies are emerging as ecofriendly and more energy-efficient alternatives to conventional expansion−compression systems. However, major challenges remain. A particular concern is the mechanical properties of magnetocaloric materials, namely, their fatigue under cycling and difficulty in processing and shaping. Nevertheless, in the past few years, using multistimuli thermodynamic cycles with multicaloric refrigerants has led to higher heat-pumping efficiencies. To address simultaneously the challenges and develop a multicaloric material, in this work, we have prepared magnetocaloric-based flexible composite mats composed of micrometric electroactive (EA) polyvinylidene fluoride (PVDF) fibers with embedded magnetocaloric/strictive La(Fe,Si) 13 particles by the simple and cost-effective electrospinning technique. The composite's structural characterization, using X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, and measurements of the local-scale piezoresponse, revealed a cubic NaZn 13 -type structure of the La(Fe,Si) 13 phase and the formation of the dominant polar β-phase of the PVDF polymer. The PVDF-La(Fe,Si) 13 composite showed an enhancement of the longitudinal piezoelectric coefficient (effective d 33 ) (−11.01 pm/V) compared with the single PVDF fiber matrix (−9.36 pm/V). The main magnetic properties of La(Fe,Si) 13 powder were retained in the PVDF-La(Fe,Si) 13 composite, including its giant magnetocaloric effect. By retaining the unique magnetic properties of La(Fe,Si) 13 embedded in the electroactive piezoelectric polymer fiber mats, we have designed a flexible, easily shapeable, and multifunctional composite enabling its potential application in multicaloric heat-pumping devices and other sensing and actuating devices.

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Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix

Cited by 9 publications

References 66 publications

Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

Multiferroic Electroactive Polymer Blend/Ferrite Nanocomposite Flexible Films for Cooling Devices

Flexible Magnetocaloric Fiber Mats for Room-Temperature Energy Applications

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