Review of Solutions for the Use of Phase Change Materials in Geopolymers

Łach, Michał; Pławecka, Kinga; Bąk, Agnieszka; Adamczyk, Marcin; Bazan, Patrycja; Kozub, B.; Korniejenko, Kinga; Lin, Wei‐Ting

doi:10.3390/ma14206044

Cited by 18 publications

(14 citation statements)

References 62 publications

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“…Exposed to a heating or cooling process, under certain convenient conditions, they will not change their temperature but will absorb large amounts of energy, thereby changing their state of aggregation. Exposed to heating or cooling, under certain conditions that are convenient to us, will not change their temperature, but will absorb large amounts of energy, thereby changing their state of aggregation [13,14].…”

Section: Phase Change Materialsmentioning

confidence: 99%

Comparison of thermal conductivity of foamed geopolymers containing phase change materials

Bąk

Pławecka

Łach

2023

J. Phys.: Conf. Ser.

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The aim of this work was to investigate the effect of Phase Change Materials on the insulation properties - thermal conductivity coefficient [λ], of fabricated foamed geopolymer panels. Phase Change Materials have been widely reported in the public literature, making them increasingly popular in recent times. PCMs have the ability to accumulate heat, which they can absorb or release due to thermal transformation, which contributes to energy efficiency. This paper presents the results of research on geopolymers based on fly ash with the addition of microencapsulated and macroencapsulated phase change materials (PCMs). Geopolymer composites were prepared by adding 0%, 5%, 10% and 15% PCM and the curing process was carried out at 60°C. Three different phase change materials with melting points of 28°C (MicroCapsPCM28 (Slovenia)) and 25°C and 42°C (PX25 and GR42 (Germany), respectively) were used. All the phase change materials used belong to the paraffin group. The obtained composite sheets were subjected to thermal conductivity tests in 3 temperature ranges (0-20°C; 20-40°C; 30-50°C). The paper also presents the density results of the foamed composites investigated, as well as the visual evaluation and the morphology of the porous structure using scanning electron microscopy. As a result of the study, it was found that foamed geopolymer composites without PCM addition have lambda coefficient values of 0.06 - 0.07 [W/m*K], while with the addition of phase change materials 0.07 - 0.085 [W/m*K]. The obtained test results give the potential to use these materials in construction as insulating materials. The use of these substances in building partitions results in the decrease of daily temperature amplitudes inside the building, as well as in the phase shift of the time of release of stored heat.

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Section: Phase Change Materialsmentioning

confidence: 99%

Comparison of thermal conductivity of foamed geopolymers containing phase change materials

Bąk

Pławecka

Łach

2023

J. Phys.: Conf. Ser.

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“…This material can be successfully used in the thriving construction industry (as exterior walls of buildings), as well as in the packaging or refrigeration industry. It is a material that can be used for insulation purposes [27,28].…”

Section: Properties and Applications Of Geopolymer Foamsmentioning

confidence: 99%

Application of diatomite as a substitute for fly ash in foamed geopolymers

Brudny

Łach

Bąk

et al. 2023

J. Phys.: Conf. Ser.

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In recent years, new climate targets in EU have led to a growing demand for construction materials with a lower carbon footprint. This implies a demand for research on materials with comparable properties and reduced CO2 emission to replace those currently in use. Geopolymers belong to the group of alkali-activated aluminosilicates, whose advantages include high compressive strength and high corrosion resistance. Examples of aluminosilicate materials used to produce geopolymers are fly ash, metakaolin or volcanic tuff. Recently, there have also been papers discussing the use of diatomite as a replacement for metakaolin in geopolymer materials. The purpose of this work is to investigate the use of diatomite as a fly ash replacement in the production of foamed geopolymers. For this purpose, fly ash based geopolymer samples with different amounts of diatomite (5%, 10%, 50%) were foamed using hydrogen peroxide as a foaming agent. Then, to observe the microstructure of the produced samples, they were subjected to scanning microscope observations. Compressive strength tests according to EN 12390-3 standard were carried out to check the strength properties after 30 days of curing. In addition, the thermal conductivity coefficients of the samples were investigated to better determine their potential industrial application. The expected result is a change in strength and thermal properties with increasing diatomite content.

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“…[1][2][3] PCMs can be applied in different fields, such as sustainable energy, heating and cooling system, and building applications. [4][5][6] For polymer-related works, PCMs have mainly been embedded into bulk materials or films. [7,8] In recent years, more studies have focused on the use of PCMs in polymer fibers, which can be made by the electrospinning method, the wet spinning method, or the melt spinning method.…”

Section: Introductionmentioning

confidence: 99%

Electrospun PMMA fibers blended with core‐shell PCM/PS microspheres for thermal regulating applications

Chang

Chen

Hsu

et al. 2022

J Chinese Chemical Soc

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Phase changing materials (PCMs) have been widely investigated because of their unique properties and applications. In recent years, PCMs have been embedded into polymer fibers for thermal regulating purposes. The PCMcontaining polymer fibers, however, usually suffer the leakage problem because PCMs are not covered well by polymers in fibers. To solve this problem, in this study, we develop a facile strategy to fabricate PCM-containing polymer fibers without the leakage problem. The PCM/polystyrene (PS) coreshell microspheres are first prepared by suspension polymerization, in which n-hexadecane is used as the PCM. By blending the PCM/PS microspheres into polymethyl methacrylate (PMMA) solutions, The PMMA fibers blended with core-shell PCM/PS microspheres can be prepared via electrospinning. Acetic acid is chosen as the solvent, which can selectively dissolve PMMA and cannot dissolve PS. Therefore, the morphologies of the core-shell PCM/PS microspheres can be maintained during the electrospinning processes. The microspheres and fibers are characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Thermal imaging results demonstrate that the PCM-containing fibers can effectively regulate temperatures and fibers with higher contents of PCM exhibit better thermal regulating behaviors. Repeated thermal regulating experiments are also conducted for up to 4 cycles.

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Review of Solutions for the Use of Phase Change Materials in Geopolymers

Cited by 18 publications

References 62 publications

Comparison of thermal conductivity of foamed geopolymers containing phase change materials

Comparison of thermal conductivity of foamed geopolymers containing phase change materials

Application of diatomite as a substitute for fly ash in foamed geopolymers

Electrospun PMMA fibers blended with core‐shell PCM/PS microspheres for thermal regulating applications

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