Morphological control and thermal properties of nanoencapsulated n-octadecane phase change material with organosilica shell materials

Zhu, Yalin; Liang, Shuen; Wang, Hui; Zhang, Ke; Jia, Xiao‐Bin; Tian, Chen; Zhou, Yanyan; Wang, Jianhua

doi:10.1016/j.enconman.2016.04.049

Cited by 72 publications

(32 citation statements)

References 45 publications

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“…However, interaction with surrounding materials and low heat transfer coefficients limit the direct application of PCM. In order to overcome these problems, microencapsulation may be utilized for incorporation of PCM into small polymeric capsules [10][11][12][13]. This provides not only an extremely high heat transfer area, but also prevents the leakage of PCM and interactions with the building structure.…”

Section: Introductionmentioning

confidence: 98%

Microencapsulated phase change materials for enhancing the thermal performance of Portland cement concrete and geopolymer concrete for passive building applications

Cao

Pilehvar

Salas-Bringas

et al. 2017

Energy Conversion and Management

257

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a b s t r a c tConcretes with a high thermal energy storage capacity were fabricated by mixing microencapsulated phase change materials (MPCM) into Portland cement concrete (PCC) and geopolymer concrete (GPC). The effect of MPCM on thermal performance and compressive strength of PCC and GPC were investigated. It was found that the replacement of sand by MPCM resulted in lower thermal conductivity and higher thermal energy storage, while the specific heat capacity of concrete remained practically stable when the phase change material (PCM) was in the liquid or solid phase. Furthermore, the thermal conductivity of GPC as function of MPCM concentration was reduced at a higher rate than that of PCC. The power consumption needed to stabilize a simulated indoor temperature of 23°C was reduced after the addition of MPCM. GPC exhibited better energy saving properties than PCC at the same conditions. A significant loss in compressive strength was observed due to the addition of MPCM to concrete. However, the compressive strength still satisfies the mechanical European regulation (EN 206-1, compressive strength class C20/25) for concrete applications. Finally, MPCM-concrete provided a good thermal stability after subjecting the samples to 100 thermal cycles at high heating/cooling rates.

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Section: Introductionmentioning

confidence: 98%

Microencapsulated phase change materials for enhancing the thermal performance of Portland cement concrete and geopolymer concrete for passive building applications

Cao

Pilehvar

Salas-Bringas

et al. 2017

Energy Conversion and Management

257

View full text Add to dashboard Cite

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“…As polymeric materials for the shell side present the issue of low thermal conductivity, numerous inorganic shell materials have been studied, resulting in an enhancement of the thermal properties of micro/nanoencapsulated PCMs with organic (paraffinic) core. Some instances of such inorganic shell materials are titanium oxide and silica . Among these, the use of silica shells has been of prime interest because of its non‐toxicity, strength, stable structure, and thermal properties .…”

Section: Introductionmentioning

confidence: 99%

“…Some instances of such inorganic shell materials are titanium oxide and silica. [24][25][26] Among these, the use of silica shells has been of prime interest because of its non-toxicity, strength, stable structure, and thermal properties. 27 In fact, silica (an abundant, economic, and environmentally friendly resource) has also been investigated as a thermal energy storage (TES) material on its own.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of n‐octacosane@silica nanocapsules for thermal storage applications

et al. 2019

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Summary This work reports the synthesis and characterisation of a core‐shell n‐octacosane@silica nanoencapsulated phase‐change material obtained via interfacial hydrolysis and polycondensation of tetraethyl orthosilicate in miniemulsion. Silica has been used as the encapsulating material because of its thermal advantages relative to synthesised polymers. The material presents excellent heat storage potential, with a measured melting latent heat varying between 57.1 and 89.0 kJ kg−1 (melting point between 58.2°C and 59.9°C) and a small particle size (between 565 and 227 nm). Degradation of the n‐octacosane core starts between 150°C and 180°C. Also, the use of silica as shell material gives way to a heat conductivity of 0.796 W m−1 K−1 (greater than that of nanoencapsulated materials with polymeric shell). Charge/discharge cycles have been successfully simulated at low pressure to prove the suitability of the nanopowder as phase‐change material. Further research will be carried out in the future regarding the use of the synthesised material in thermal applications involving nanofluids.

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“…To solve this problem, encapsulation technology has been developed by coating the PCMs core within a tiny container shell, which can prevent the PCMs from reacting with the outside environment and controlling the volume change of the PCMs during phase transition [14]. So far, several methods have been studied for the preparation of micro/nanoencapsulated PCMs, such as spray drying [15], mini-emulsion polymerization [16][17][18], interfacial polymerization [19], in situ polymerization [20,21], and sol-gel method [22][23][24][25]. The shell materials for these methods contain polymer materials, such as polystyrene, poly (methyl methacrylate), melamine-formaldehyde resin, urea-formaldehyde resin, and inorganic materials such as silicon dioxide and zirconium dioxide.…”

Section: Introductionmentioning

confidence: 99%

A Novel Encapsulation Method for Phase Change Materials with a AgBr Shell as a Thermal Energy Storage Material

et al. 2019

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Micro/nanoencapsulated phase change materials, used typically as energy storage materials, are frequently applied in energy-saving and energy-efficient processes. In this work, we proposed a novel method for the micro/nanoencapsulation of phase change materials (PCMs), which has the advantage of simple operation and can be suitable for encapsulation of more than one PCM. Fatty acid PCMs, such as steric acid and palmitic acid, and non-fatty acid PCMs, like beeswax, have both been successfully micro/nanoencapsulated by a silver bromide (AgBr) shell with this method. The obtained fatty acid/AgBr micro/nanocapsules, with diameters of less than 1 µm, show good thermal storage capacities over 150 J/g with their encapsulation ratios as high as 92.4%. Similarly, the prepared beeswax/AgBr micro/nanocapsules show a high encapsulation ratio. In addition, all the micro/nanocapsules exhibit good thermal stability. Therefore, the method developed by this work is highly-efficient for the encapsulation of PCMs, which is beneficial for PCMs in various applications as energy storage materials.

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Morphological control and thermal properties of nanoencapsulated n-octadecane phase change material with organosilica shell materials

Cited by 72 publications

References 45 publications

Microencapsulated phase change materials for enhancing the thermal performance of Portland cement concrete and geopolymer concrete for passive building applications

Microencapsulated phase change materials for enhancing the thermal performance of Portland cement concrete and geopolymer concrete for passive building applications

Synthesis and characterisation of n‐octacosane@silica nanocapsules for thermal storage applications

A Novel Encapsulation Method for Phase Change Materials with a AgBr Shell as a Thermal Energy Storage Material

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