Determining influences of SiO2 encapsulation on thermal energy storage properties of different phase change materials

Şahan, Nurten; Paksoy, Halime

doi:10.1016/j.solmat.2016.08.030

Cited by 109 publications

(33 citation statements)

References 36 publications

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“…Leakage can be seen as a common problem for all PCMs that make them difficult to integrate into systems where materials undergo a phase change . The impregnation of PCMs into porous materials, development of solid‐solid PCMs, and encapsulation of PCMs has been the most preferred techniques to overcome leakage problem of PCMs . Among the PCM‐developing techniques, encapsulation allows easy and effective integration into many applications .…”

Section: Introductionmentioning

confidence: 99%

“…4 The impregnation of PCMs into porous materials, development of solid-solid PCMs, and encapsulation of PCMs has been the most preferred techniques to overcome leakage problem of PCMs. 5 Among the PCM-developing techniques, encapsulation allows easy and effective integration into many applications. 6 Encapsulated PCMs in macro, micro, and nano sizes can be used in several applications, such as energy saving in buildings, 7 transportation of food 8 and medical stuff, 9 smart textile applications, 10 and electronics.…”

Section: Introductionmentioning

confidence: 99%

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Designing behenic acid microcapsules as novel phase change material for thermal energy storage applications at medium temperature

Şahan

Paksoy

2020

Int J Energy Res

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Summary Fatty acids are bio‐based materials that can be used as phase change materials (PCMs). Microencapsulation of low carbon number fatty acids for mainly building applications have been realized in previous studies. In this study, behenic acid (BA), a fatty acid with medium melting range (65°C‐85°C), has been microencapsulated for the first time. PMMA and its three copolymers were used as shell material of these novel encapsulated PCMs prepared by emulsion polymerization technique. The influences of using different comonomers in shell materials on the thermal, morphological, and chemical properties were investigated. Melting phase change temperature ranges were found as 65°C to 85°C for all capsule candidates. Capsules had uniform spherical geometry with size ranges under 500 nm. The capsules are suggested as novel PCM candidates in this temperature range that has potential applications in industrial waste heat, electronics, solar residential heating, lithium‐ion batteries, and automotive application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Designing behenic acid microcapsules as novel phase change material for thermal energy storage applications at medium temperature

Şahan

Paksoy

2020

Int J Energy Res

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“…14 Although the polymer shell has high compatibility with PCMs and is simple to operate, it has not been widely used as a result of some main problems such as poor thermal conductivity, lack of rigidity, and flammability. 23,24 Microencapsulated PCM has been successfully prepared using alternative inorganic materials like CaCO 3 , TiO 2 , and graphene. 15 Therefore, in order to overcome the shortage of polymer shell, modification of the polymer shell of the microcapsules with inorganic materials can improve their properties.…”

Section: Introductionmentioning

confidence: 99%

“…22 In addition, using inorganic materials to encapsulate PCM has attracted more attention; there have been some reports involving the use of inorganic silica as a wall material for encapsulating PCM. 23,24 Microencapsulated PCM has been successfully prepared using alternative inorganic materials like CaCO 3 , TiO 2 , and graphene. [25][26][27] Wang et al and Jiang et al 25,26 encapsulated the PCM into a CaCO 3 shell and found that these rigid shell microcapsules achieved thermal conductivity enhancement.…”

Section: Introductionmentioning

confidence: 99%

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

et al. 2019

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Summary Novel microencapsulated phase change materials (MEPCMs) composed of the lead tungstate (PbWO4) shell and paraffin core were designed for shielding of gamma radiation as well as thermal energy storage. Such MEPCMs were prepared via self‐assembly methods and in‐situ precipitation. The PbWO4 shell with excellent photon attenuation can give the resulting MEPCMs an acceptable gamma radiation shielding capability. The chemical composition and structure of microcapsules samples were studied by X‐ray diffractometer (XRD) and Fourier‐transform infrared spectroscopy (FTIR). The effects of different core/shell mass ratios on the surface morphology and microstructure of the MEPCMs were determined by scanning electron microscopy (SEM), energy‐dispersive spectrometer (EDS), and transmission electronic microscopy (TEM). It was confirmed that the microcapsules exhibit a distinct core‐shell structure and a perfect spherical shape. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to present thermal stability and thermal‐storage capability of MEPCMs. A high‐purity germanium gamma spectrometer to measure the attenuation coefficient of the microcapsules for gamma rays showed that the MECPMs has good γ‐rays‐shielding property. The multifunction microcapsules in this study have great potential applications for building energy conservation as well as wearable personal protection in nuclear energy engineering.

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“…Literature shows that melamine‐formaldehyde resin, urea formaldehyde, poly‐urethane, cellulose, chitosan, gelatine acacia, polymethyl methacrylate, SiO 2 , polycarbonate, and polystyrene have been used successfully as shell materials for PCMs and other encapsulation purposes as well. The existing encapsulated PCMs are for building applications addressing thermal comfort range of 22°C to 26°C.…”

Section: Introductionmentioning

confidence: 99%

Developing microencapsulated 12-hydroxystearic acid (HSA) for phase change material use

Şahan

Paksoy

2018

Int J Energy Res

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Summary Phase change materials (PCM) have an increasingly more important role as a thermal energy storage (TES) media. However, leakage problem of PCM causes limitation during their integration in TES systems. Therefore, the encapsulation of PCMs is attracting research interest to extend usage of PCMs in real TES applications in recent years. In this study, hydroxystearic acid (HSA) was encapsulated with polymethyl methacrylate (PMMA) and different PMMA comonomer shells via emulsion polymerization method for the first time in literature. HSA with high melting temperature range (74–78°C) can widen the scope of using PCMs, and the encapsulated form can make it more versatile. The chemical structures, morphologies, and thermophysical properties of capsules were determined by FT‐IR, SEM, DSC, TGA, and thermal infrared camera. Among the produced HSA capsule candidates, PMMA‐HEMA is the most promising with latent heat of 48.5 J/g with melting range of 47 to 85°C. SEM analysis indicated that the capsules have spherical shape with compact surface at nano‐micro (100–440 nm) size range; however, some capsules exhibited agglomeration.

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Determining influences of SiO2 encapsulation on thermal energy storage properties of different phase change materials

Cited by 109 publications

References 36 publications

Designing behenic acid microcapsules as novel phase change material for thermal energy storage applications at medium temperature

Designing behenic acid microcapsules as novel phase change material for thermal energy storage applications at medium temperature

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

Developing microencapsulated 12-hydroxystearic acid (HSA) for phase change material use

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