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    Effect of pre-treatment methods on natural raw materials-based phase change material composites for building applications
    (Elsevier Sci Ltd, 2020) Konuklu, Yeliz; Ersoy, Orkun; Akar, Hasan Burak; Erzin, Fatma
    This study focuses on the effect of pre-treatment methods of natural raw materials to the properties of diatomite or sepiolite-based heptadecane composites for building applications. In order to see the effects of different pre-treatment methods, the composites were prepared using impregnation method without pre-treatment, with microwave treatment and calcination treatment of raw materials before compounding. Chemical (FTIR), morphological (SEM) and thermal (DSC) analysis results showed that shapestabilized diatomite- and sepiolite-based hexadecane composites were successfully prepared by impregnation method. It was observed that the pre-treatment performed in the diatomite with microwave for no more than 1 min increased the percentages of PCM and latent heats from 28,36% and 51.71 J/g to 35,78% and 65.24 J/g, respectively. The percentage of PCM and latent heat increased from 22,23% and 40.541/g to 32,38% and 59.54 J/g, respectively, after the microwave treatment of sepiolite for 3-6 min. The results showed that pre-treatment with calcination in raw material-based PCM composites did not have a positive effect as much as pre-treatment with microwave. The success of the microwave pretreatment against calcination has been attributed to the homogeneous microwave heating process. Leak tightness tests and thermal performance tests of composites in cement-based grouting mortar have also proven that composites store excess heat and can provide thermal regulation in building applications as leakage-free energy storage materials. (C) 2020 Elsevier Ltd. All rights reserved.
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    Promising palmitic acid/poly(allyl methacrylate) microcapsules for thermal management applications
    (Pergamon-Elsevier Science Ltd, 2023) Konuklu, Yeliz; Akar, Hasan Burak
    This study aimed to develop a promising thermal energy storage material based on poly(allyl methacrylate (AMA))-based palmitic acid (PA) microencapsulation using emulsion polymerization. Poly(AMA) and PA were chosen as the capsule shell and core materials, respectively. The synthesized microcapsules exhibited a good latent heat storage capacity of 143-188 J/g. This study also aimed to evaluate the effect of the core material ratio of the microcapsules on the thermal, structural, and chemical properties of PA microcapsules. To determine the thermal performance of the prepared microcapsules, mortar-based composite materials containing PA micro -capsules were prepared at a ratio of 90/10 (wt% mortar/micro phase change material) and analyzed during heating and cooling using infrared techniques. The analysis showed that the temperature of the composite materials containing PA microcapsules was 6.6 degrees C lower than that of the reference composite after 60 min of heating. This indicates that mortar composites containing PA microcapsules are less affected by heating and cooling and can therefore be applied as promising energy storage materials for thermal management applica-tions, particularly in buildings.