Preparation of Phase Change Microcapsules with the Enhanced Photothermal Performance

Latibari, Sara Tahan; Eversdijk, J.; Cuypers, Ruud; Drosou, Vassiliki; Shahi, Mina

doi:10.3390/polym11091507

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…As shown in Figure , the photothermal‐conversion efficiency, thermal management performance, EMI shielding performance and flame retardancy of the work based on carbon materials and PCMs (paraffin, PEG) are compared with this work. The results show that compared with other photothermal conversion materials, [ 36–38 ] F‐rGO/paraffin 40 prepared in this work has excellent η (81.6%).…”

Section: Resultsmentioning

confidence: 68%

Shaped Photothermal Conversion Phase‐Change Materials with Excellent Electromagnetic Shielding Performance and Flame Retardancy

et al. 2023

Adv Eng Mater

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The highly efficient utilization of solar energy is urgent to deal with the energy crisis and environmental pollution causing by the petroleum energy, in which the strategy of photothermal conversion energy-storage materials via the photothermal conversion and phasechange process attracts much attention. [1] However, the no thermal effect for the 40% of the solar radiation energy during the photothermal conversion process and the leakage of phase-change materials (PCMs) during the solid-liquid transition, which greatly limited its wide application. [2] Generally, there are three kinds of shaped photothermal conversion PCMs, including dye-, metal-(metal oxide), and carbon-materials-shaped photothermal conversion PCMs. [3] The dye takes the advantages of strong selective absorption characteristics for the 40% of the solar radiation energy, good compatibility, and reactivity, showing broad application prospects in the fields of color temperature regulating fibers and textiles. [4] The metal and metal oxide are also applicated in the shaped photothermal conversion PCMs attributing to its low price and high-efficient light heat conversion capability. Moreover, the carbon materials, especially the nano-carbon materials including carbon nanotube (CNT), graphene, graphite, carbon fiber, etc., are often used to prepare photothermal conversion materials because of their strong light absorption, good physical performance, and excellent thermal conductivity. [5] Paraffin is widely applicated in the field of via solid-liquid phase transition at low temperature attributing to the high latent heat and excellent chemical stability. [6] However, its application was limited by the low thermal conductivity and leakage during the solid-liquid phase-transition process for the shaped photothermal conversion PCMs. [7] To solve the aforementioned problems, paraffin wax was usually encapsulated by or mixed with high thermal conductivity materials including metal, [8] graphite, [9] graphene, [10] CNT, [11] transition metal nitride, [12] etc. In particular, the composite PCM based on 3D skeleton has been widely studied because of its excellent leakage resistance and stable molding structure. Including the construction of 3D carbon-based aerogels [13] and magnetic metal foam frames, [14] which realizes efficient light/heat energy conversion and storage. Moreover, the carbon-based aerogels or foams were developed as the shaped structure to store the PCMs with excellent thermal conductivity and 3D porous structure. It should be noted that the graphene foam prepared via a simple method not only preventing the leakage of PCMs, but also improving the

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Section: Resultsmentioning

confidence: 68%

Shaped Photothermal Conversion Phase‐Change Materials with Excellent Electromagnetic Shielding Performance and Flame Retardancy

et al. 2023

Adv Eng Mater

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“…Additional small endothermic peaks in the range of 282–289 °C can be attributed to the latent heat during the eutectic phase transformation of the ZnAl alloy core. Several characteristics of the core-shell material were calculated according to Equations (12) to (14) [ 83 , 84 , 85 ], and are summarized in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Additional small endothermic peaks in the range of 282-289 °C can be attributed to the latent heat during the eutectic phase transformation of the ZnAl alloy core. Several characteristics of the core-shell material were calculated according to Equations (12) to (14) [83][84][85], and are summarized in Table 3. Thermal energy capability = × 100% (14) where ΔHm,core and ΔHm,core-shell are the melting heat capacities, and ΔHc,core and ΔHc,core-shell are the solidification heat capacities of the core material and the core-shell material, respectively.…”

Section: Characterization Of the Znal/ni/nip Core-shell Powdermentioning

confidence: 99%

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

et al. 2021

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Electroless deposition on zinc and its alloys is challenging because of the negative standard potential of zinc, the formation of poor surface layers during oxidation in aqueous solutions, and extensive hydrogen evolution. Therefore, there are only few reports of electroless deposition on Zn and its alloys, neither of them on micro/nano powders. Here, we propose a two-step process that allows the formation of compact, uniform, and conformal Ni/NiP shell on Zn-based alloy microparticles without agglomeration. The process utilizes controlled galvanic displacement of Ni deposition in ethanol-based bath, followed by NiP autocatalytic deposition in an alkaline aqueous solution. The mechanism and effect of deposition conditions on the shell formation are discussed. Thermal stability and functional analysis of core-shell powder reveal a thermal storage capability of 98.5% with an encapsulation ratio of 66.5%. No significant morphological change of the core-shell powder and no apparent leakage of the ZnAl alloy through the Ni shell are evident following differential scanning calorimetry tests. Our two-step process paves the way to utilize electroless deposition for depositing metallic-based functional coatings on Zn-based bulk and powder materials.

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“…[ 15–17 ] Because the thermal transitions of PCMs are sensitive to the shell composition and impurities, the conventional encapsulation approach has a number of shortcomings. [ 18–20 ] A well‐controlled method for forming PCMs‐infilled microcapsules would thus be desirable.…”

Section: Figurementioning

confidence: 99%

Polymer Composites Containing Phase‐Change Microcapsules Displaying Deep Undercooling Exhibit Thermal History‐Dependent Mechanical Properties

Liu

Streufert

et al. 2020

Adv Materials Technologies

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they melt into a liquid and releasing heat as they solidify into a solid. The greater the latent heat of fusion, the greater the energy absorbed/released during these phase transitions. [5,6] As various groups have shown, by encapsulating micron to millimeter diameter droplets of a PCM, functionalities ranging from temperaturedependent permeability to enhanced solar thermal energy storage efficiency can be realized. [7,8] Once encapsulated, PCMs can be embedded in a diversity of matrices, which may enable new applications in areas ranging from thermal energy storage and conversion, electronics, [9-12] smart fibers and textiles, and thermal comfort in vehicles. [13] A conventional approach to encapsulation is through shell polymerization in oil-in-water (o/w) or water-in-oil-in-water (w/o/w) double emulsions, such as those used to prepare the self-healing microcapsules first reported by Moore et al. [14] Challenges with this approach are the generally wide size distribution of the capsules prepared, compatibility between the capsule shell polymerization chemistry and the core chemistry, and control of the synthetic parameters required to enable reproducible results. [15-17] Because the thermal transitions of PCMs are sensitive to the Microencapsulated materials are receiving broad attention for applications as diverse as energy storage and conversion, biomedicine, self-healing materials, and electronics. Here, a general microfluidic approach is presented to prepare phase-change material-infilled microcapsules with unique thermal and mechanical properties. Aqueous sodium acetate solutions are encapsulated by an acrylate-based shell via a microfluidic method. To understand and optimize microcapsule formation, flow behavior during the encapsulation is numerically simulated. When the microcapsules are embedded in an acrylate matrix (same composition as the shell wall material), the microcapsules exhibit a significant 46.6 ºC difference between the crystallization and melting temperatures as determined by differential scanning calorimetry at a rate of 10 ºC per min. Variable temperature dynamic mechanical analysis over the range of 50 to-90 ºC reveals up to a 50% change in the composite's elastic modulus at a given temperature, depending on if the sample is being cooled or heated, due to significant undercooling of the core material crystallization as shown by X-ray diffraction.

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Preparation of Phase Change Microcapsules with the Enhanced Photothermal Performance

Cited by 14 publications

References 29 publications

Shaped Photothermal Conversion Phase‐Change Materials with Excellent Electromagnetic Shielding Performance and Flame Retardancy

Shaped Photothermal Conversion Phase‐Change Materials with Excellent Electromagnetic Shielding Performance and Flame Retardancy

Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

Polymer Composites Containing Phase‐Change Microcapsules Displaying Deep Undercooling Exhibit Thermal History‐Dependent Mechanical Properties

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