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Christopher W Bielawski
다차원 탄소재료 연구단
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A eutectic mixture of galactitol and mannitol as a phase change material for latent heat storage

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Title
A eutectic mixture of galactitol and mannitol as a phase change material for latent heat storage
Author(s)
Abhijit Paul; Li Shi; Christopher W. Bielawski
Publication Date
2015-10
Journal
ENERGY CONVERSION AND MANAGEMENT, v.103, no., pp.139 - 146
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Abstract The thermophysical properties of mixtures of galactitol and mannitol were examined via differential scanning calorimetry (DSC) and X-ray powder diffraction (XRD) analysis. The aforementioned sugars were found to form a eutectic mixture at a 30:70 molar ratio of galactitol and manntitol, and displayed a melting point of 153 C while maintaining a high latent heat of fusion (ΔHfus = 292 J g-1). The XRD data revealed that the eutectic mixture contained the α, β, and δ forms of mannitol with the δ form being the major component. By varying the temperature ramp rates utilized in the DSC measurements from 0.5 C min-1 to 20 C min-1, the heat of crystallization as well as the crystallization temperature increased (c.f., ΔHcrys: 64 J g-1 → 197 J g-1; Tc: 68 C → 105 C). In addition, the temperature and the enthalpy of crystallization were also improved by up to 34% through the addition of small quantities (up to 0.5 wt%) of nucleating agents, such as graphite powder or silver iodide. After 100 heating/cooling cycles under an atmosphere of nitrogen, the heat of fusion of the eutectic mixture decreased by only 4% with no change in the melting point, and the mixture appeared to be chemically stable according to a Fourier transform infrared (FT-IR) spectroscopic analysis. Collectively, these data indicate that the eutectic mixture exhibits excellent cyclic stability under ambient atmospheres and offers potential for use in thermal energy storage applications. © Elsevier Ltd
URI
https://pr.ibs.re.kr/handle/8788114/1858
ISSN
0196-8904
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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