N-oktadekan / biyokömür kompoziti: hazırlanması, karakterizasyonu ve enerji depolama özellikleri

Öz

Biyokömür (BC) toprak ıslahı, enerji depolama, pillerde anodik malzeme olarak, binalarda elektromanyetik emisyon yakalama gibi birçok farklı kullanıma sahip, fonksiyonel gruplar açısından zengin, karbonize bir malzemedir. N-oktadekan (OD), uygun faz değişim sıcaklığı nedeniyle bina enerji depolama malzemelerinde uygulanabilen, termal enerji depolaması için uygun bir organik faz değişim malzemesidir. Bu çalışmada BC, OD ile vakumlu fırında 0,08 Mbar'da 70 °C'de 3 saat süreyle emprenye edildi. Emprenye sonrası ağırlık artışı %50 olarak bulunmuştur. Biyokömürden n-oktadekan sızıntısı, sızıntı testiyle tespit edildi. Isıl işlem görmüş ahşap numunelerinin fiziko-kimyasal olarak karakterizasyonu fourier transform kızılötesi spektroskopisi (FT-IR) ile incelenmiştir. Numunelerin termal bozunma stabilitesi, termogravimetrik analizler (TG) ve diferansiyel taramalı kalorimetri (DSC) ile analiz edildi. Sonuçlara göre OD emdirilmiş BC numunelerinde sızdırmazlık testi sonrasında herhangi bir sızıntı gözlenmemiştir. Elde edilen sonuçlara göre BC/OD, binalarda veya benzeri uygulamalarda enerji depolamaya uygun olumlu özellikler göstermektedir.

Anahtar Kelimeler

• odun kömürü
• n-oktadecan
• faz değiştiren maddeler

N-octadecane /bio-char composite: preparation, characterization and energy storage properties

Öz

Biochar (BC) is a carbonized material rich in functional groups that has many different uses such as soil reclamation, energy storage, anodic material in batteries and electromagnetic emission capture in buildings. The n-octadecane (OD) is a favourable organic phase change material (PCM) for thermal energy storage which can be applied in building energy storage materials due to its proper phase change temperature. In this study, BC was impregnated with the OD in the vacuum oven at 0.08 Mbar at 70 °C for 3h. The weight percentage gain was found to be 50% after impregnation. Leakage of OD from BC after impregnation was detected by leakage test. The physico-chemically characterize of thermally treated wood samples were examined by Fourier Transform Infrared Spectroscopy (FT-IR). Thermal degradation stability of the samples were analyzed by thermogravimetric analyses (TGA) and diffential scanning calorimetry (DSC) analysis. According to results, no leakage was observed after the leakage test in BC samples impregnated with OD. A significant amount of residue was evident in the BC after it was infused with OD indicating that its decomposition commenced only at markedly high temperatures according to TGA results. The FTIR spectrum doesn't show any extra absorbance peaks. According to obtained results, BC/OD exhibits favourable characteristics suitable for energy storage in buildings or similar applications.

Anahtar Kelimeler

• biochar
• n-octadecane
• phase change materials

Kaynakça

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