Preparation and properties of lauric acid/tetradecanol/SiO2 shape-stabilized phase change materials

doi:10.19799/j.cnki.2095-4239.2020.0202

Abstract

Abstract:

Phase change materials (PCMs) can easily leak from building materials. A shape-stabilized phase change material (ssPCM), called LA-TD/SiO₂, is prepared herein through the sol–gel method to overcome the leakage defect. The optimum preparation process of LA-TD/SiO₂ is determined from the pH value and the stirring rate of the condensation reaction and from the amount of added LA-TD. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy, differential scanning calorimetry, and thermal gravimetric tests are performed to study the LA-TD/SiO₂ properties. The results show that LA-TD/SiO₂ is spherical in the SEM morphology. The maximum particle size of LA-TD/SiO₂ is less than 30 μm. LA-TD is effectively wrapped by SiO₂, and they are physically combined. The phase change temperature of LA-TD/SiO₂is 24.81 °C, which is slightly lower than that of LA-TD (i.e., 25.0 °C). The latent heat of LA-TD/SiO₂ is 47.96 J/g, which is approximately 1/3 that of LA-TD (i.e., 136.28 J/g). Accordingly, 500 melting/solidification cycling experiments show that LA-TD/SiO₂ has good thermal stability and can be used for building application.

Key words: phase change materials, shape-stabilized, silicon dioxide, phase change temperature, latent heat

CLC Number:

TK 02

Sai WANG, Zhigao SUN, Juan LI, Cuimin LI. Preparation and properties of lauric acid/tetradecanol/SiO₂ shape-stabilized phase change materials[J]. Energy Storage Science and Technology, 2020, 9(6): 1768-1774.

Figures/Tables 8

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参数	芯壁比	1∶1.5	1∶2	1∶3	0∶1
导热系数 /W·(m·K)^-1	1	0.2504	0.2659	0.2806	0.3092
	2	0.2513	0.2571	0.2777	0.3049
	3	0.2527	0.2606	0.2870	0.2999
平均值/W·(m·K)^-1		0.2515	0.2612	0.2818	0.3047

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Preparation and properties of lauric acid/tetradecanol/SiO₂ shape-stabilized phase change materials

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