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  • Küçük Resim
    Öğe
    Akıllı deri tekstil uygulamaları için faz değiştiren maddelerin mikrokapsüllenmesi
    (Niğde Ömer Halisdemir Üniversitesi / Fen Bilimleri Enstitüsü, 2019) Erzin, Fatma; Konuklu, Yeliz
    Bu yüksek lisans çalışmasında, ısıl kontrolü sağlayabilen akıllı deri üretiminde kullanılabilecek mikrokapsüllenmiş faz değiştiren madde (FDM) sentezi ve karakterizasyonunun yapılması amaçlanmıştır. Çalışma kapsamında; heptadekan, hekzadekan, laurik asit ve parafin olmak üzere 4 adet FDM kullanılmıştır. FDM'lerin melamin-formaldehit (MF) reçineleri ve rezorsinol-melamin-formaldehit (RMF) reçineleri ile mikrokapsülleri sentezlenerek ısıl dayanımları ve termal enerji depolama kapasiteleri karşılaştırılmıştır. Mikrokapsüllerin tekstil uygulamalarında kullanılabilmeleri için yüksek ısıl dayanıma sahip olmaları gerekmektedir. Prosese eklenen 3 farklı miktarda rezorsinol (1,5 g, 2 g ve 2,5 g) ile ısıl dayanımı yüksek ve termal enerji depolama kapasitesi iyi olan mikrokapsüller üretilmiştir. Üretilen FDM mikrokapsüllerinin termal, morfolojik ve kimyasal özellikleri; diferansiyel taramalı kalorimetre (DSC), taramalı elektron mikroskobu (SEM) ve Fourier dönüşümlü infrared spektrometresi (FTIR) ile incelenmiştir. Üretilen mikrokapsüller deriye vaks yardımı ile eklenerek deri örneklerinin termal performansı incelenmiştir.
  • Küçük Resim Yok
    Öğe
    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.
  • Küçük Resim Yok
    Öğe
    Facile synthesis of resorcinol-melamine-formaldehyde microcapsules containing hexadecane for thermal energy storage
    (Elsevier, 2021) Erzin, Fatma; Konuklu, Yeliz
    In this study, it is aimed to synthesize and characterize microencapsulated phase-change material (PCM) which can be used in thermal energy storage applications with thermoregulating properties. Within this study, hexadecane was used as core material. Microcapsules of PCMs were synthesized using both melamine-formaldehyde (MF) resin and resorcinol-melamine-formaldehyde (RMF) resin. To produce microcapsules with high thermal resistance and good energy storage capacity; 3 different amounts of resorcinol (1,5 g, 2 g, and 2,5 g) were added during the process. The color of hexadecane/RMF capsules turns into reddish-brown color depending on the amount of added resorcinol. The thermal, morphological, and chemical properties of the composites were analyzed by differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy, respectively. It can be revealed from the characterization results that leakage free colored hexadecane microcapsules were synthesized successfully and they offer good thermal properties and mechanical stability for thermal energy storage applications.