Thermal properties and structural characterizations of new types of phase change material: Anhydrous and hydrated palmitic acid/camphene solid dispersions

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Title:	Thermal properties and structural characterizations of new types of phase change material: Anhydrous and hydrated palmitic acid/camphene solid dispersions
Authors:	李度;Lee, Tu;Chiu, Yu Hsiu;Lee, Yun;Lee, Hung Lin
Contributors:	工學院化學工程與材料工程學系
Keywords:	Camphene;Crystal structure;Crystallites;differential scanning calorimetry;Dispersions;Hydration;latent heat;microstructure;molecular weight;Nanostructure;Palmitic acid;periodicity;Phase change material;Phase change materials;Small-angle X-ray scattering;Solid dispersion;specific heat;Temperature–history method;Thermal properties
Date:	2014-01-01
Issue Date:	2026-04-21 14:22:09 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： •Solid dispersion is implemented on phase change materials.•Water is added as a tertiary component.•Specific heat of solid is increased by partially amorphous camphene.•Microstructures are characterized by LTDSC, PXRD and SAXS.•Thermal properties are linked to microstructures. Two new types of phase change material anhydrous and hydrated palmitic acid/camphene solid dispersions (PA1CA1) are prepared and characterized by low-temperature differential scanning calorimetry, powder X-ray diffraction, small-angle X-ray scattering and temperature–history method. Their microstructures contain nanometer-sized palmitic acid (PA) crystallites with lamellar periodicity dispersed in a partially amorphous plastic crystalline camphene (CA) matrix. The PA phase apparently possesses a relatively high latent heat value inherited from the pristine crystalline PA of 229.7±0.1kJkg−1. The relatively high specific heat of solid, Cps, for anhydrous PA1CA1 of 2.17±0.06kJkg−1K−1 is originated from the presence of disordered CA matrix. Hydration of PA1CA1 can further increase the Cps to 2.61±0.01kJkg−1K−1. The mixing of partially amorphous CA, some PA and the small amount of water may have turned the matrix into more disorder due to their different bonding natures, molecular weights, and various molecular shapes and sizes. 出版者： Elsevier B.V 出版日期： 2014 出處： Thermochimica acta, 2014, Vol.575, p.81-89 版權： 2013 Elsevier B.V. 識別號： ISSN: 0040-6031 識別號： EISSN: 1872-762X 識別號： DOI: 10.1016/j.tca.2013.10.008
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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