Rheological and thermal properties of suspensions of microcapsules containing phase change materials

Cao, Vinh Duy; Salas-Bringas, Carlos; Schüller, Reidar Barfod; Szczotok, Anna M.; Hiorth, Marianne; Carmona, Manuel; Rodríguez, Juan F.; Kjøniksen, Anna–Lena

doi:10.1007/s00396-018-4316-9

Cited by 19 publications

(17 citation statements)

References 25 publications

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“…The samples were ovendried at 105°C until a constant weight was achieved. It was previously confirmed by thermogravimetric analysis (TGA) that the microcapsules were completely stable at temperatures lower than 150°C [29]. The samples were cooled down to room temperature before recording the oven dried mass m d .…”

Section: Density and Porositymentioning

confidence: 99%

“…3), MPCM has a tendency to form agglomerated structures with larger sizes (D 60 = 240 lm). The agglomeration of the microcapsules is due to non-encapsulated PCM outside the microcapsules [29]. The large size of the agglomerates reduces the ability of the MPCM to fill up cavities and increase the tendency to entrap air on their surface and in their structure.…”

Section: Mpcm-concrete Density and Porositymentioning

confidence: 99%

“…The thermal conductivity of the MPCM-concrete samples was determined at temperatures below and above melting range of MPCM (20-32°C) [29]. They are denoted solid thermal conductivity, k S (below melting point) and liquid thermal conductivity, k L (above melting point).…”

Section: Thermal Conductivitymentioning

confidence: 99%

See 2 more Smart Citations

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

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241

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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: Density and Porositymentioning

confidence: 99%

Section: Mpcm-concrete Density and Porositymentioning

confidence: 99%

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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

Self Cite

241

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“…It is, however, important to ensure that the microcapsules do not break during the mixing process, 14 as this will adversely affect the thermal properties 15 and is expected to influence the rheological behavior. 16 The integration of MPCM into geopolymer materials has been investigated in recent years, showing promising results for reducing the energy consumption of buildings. 11−13 For incorporation into geopolymers, the MPCM should be able to withstand the highly alkaline environment of the geopolymer mixture.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microcapsule Size and Shell Polarity on the Time-Dependent Viscosity of Geopolymer Paste

Cao

Pilehvar

Bringas

et al. 2018

Ind. Eng. Chem. Res.

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The effects of microencapsulated phase-change materials (MPCM) on the rheological properties of a geopolymer paste (GPP) were investigated. In order to quantify the time-dependent viscosity increase of the geopolymer paste containing MPCM (GPP-MPCM), a new rheological model was successfully developed. Three different MPCMs were compared in order to examine the effect of the hygroscopic nature of the microcapsule shells and the size distribution of the microcapsules. In addition, the effect of microcapsule concentration was investigated. It was found that microcapsules with polar functional groups on the shells affect the viscosity and the geopolymerization reaction of the geopolymer paste much more than microcapsules with hydrophobic shells. In addition, aggregated microcapsules influence the viscosities less than unaggregated microcapsules.

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“…However, as solid-liquid PCMs, paraffin waxes are prone to leakage during the phase change process. To overcome this defect, many studies have been focused on the development of change phase microcapsules (microPCMs), which have a stable core-shell structure composed of an organic/inorganic shell and a PCM core [23,24,25]. In our previous work, we used microPCMs to prepare a low-temperature protective fabric [26].…”

Section: Introductionmentioning

confidence: 99%

The Design and Manufacture of a Multilayer Low-Temperature Protective Composite Fabric Based on Active Heating Materials and Passive Insulating Materials

Sun

Wang

et al. 2019

Polymers

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Based on active heating materials (the phase change microcapsules (microPCMs)) and passive insulating materials (SiO2 aerogel), a new-type multilayer low temperature protective composite fabric (MPF) was designed and manufactured to meet the demands of protection and operation in a short time under a low-temperature environment. Results showed that the MPF consisted of three layers including the fabric layer, the microPCM function layer, and the SiO2 aerogel thermal insulation layer. The differential scanning calorimeter (DSC) results demonstrated that the phase transition enthalpy of the composite was 96.2 J/g during the cooling process. The low-temperature resistance and thermal insulation performance at −50 °C were investigated. The results also demonstrated that the low-temperature resistance time of the MPF was 660 s and the power consumption of the MPFs needed to maintain 37 °C for 10 and 20 min were 629 J and 1872 J, respectively. Compared with the microPCM function layer and the thermal insulation layer, which have the same thickness as the MPF, the low-temperature resistance time of the MPF was prolonged for about 2 and 3 min, respectively. The MPF could provide effective protection of the low-temperature work in a short time and could be applied as potential materials in low-temperature protection.

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Rheological and thermal properties of suspensions of microcapsules containing phase change materials

Cited by 19 publications

References 25 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

Influence of Microcapsule Size and Shell Polarity on the Time-Dependent Viscosity of Geopolymer Paste

The Design and Manufacture of a Multilayer Low-Temperature Protective Composite Fabric Based on Active Heating Materials and Passive Insulating Materials

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