Preparation and Thermal Properties of 1‐Hexadecanol‐Palmitic Acid Eutectic Mixture/Activated Carbon Composite Phase Change Material for Thermal Energy Storage

Abstract

In this study, a new kind of 1-hexadecanol-palmitic acid (HD-PA) binary eutectic mixture and the composite phase change materials (PCMs) composed of HD-PA absorbed into activated carbon (AC) pores with different mass percentage of 50, 55, 60, and 65% were prepared by vacuum impregnation method. The chemical structural, thermal stability and thermal durability of HD-PA/AC composite phase change materials (CPCMs) with different mass fraction of HD-PA was characterized by Fourier transformation infrared (FT-IR) spectrometer, differential scanning calorimetry (DSC) and thermogravimetric analyzer (TGA), respectively. The specific surface area of AC were determined to be 760 m 2 g À 1 and abundant mesopores and micropores with the sizes at 1.8 and 0.6 nm were observed according to the N 2 adsorption-desorption measurement. DSC results showed that the onset melting temperature and latent heat of novel HD-PA eutectic were 50.2°C and 226.6 J g À 1 , respectively. The addition of AC to the PCM of binary HD-PA eutectic can enhance its thermal stability, durability and thermal energy storage-release rate. The form-stable HD-PA/AC CPCM can be used as energy storage materials in many fields owing to its good thermal properties and chemical stability.Keywords: binary eutectic mixture · energy storage · 1hexadecanol · palmitic acid · phase change material · thermal properties

Preparation and performances of palmitic acid/diatomite form‐stable composite phase change materials

“…The absorptions at 1472 and 1703 cm −1 were assigned to C–C vibrations and C═O stretching vibrations. Besides, 1296, 945, and 730 cm −1 were attributed to the bending vibration of in‐plane and out‐of‐plane, and in‐plane winging vibration of –OH in PA . Moreover, all of the characteristic absorption peaks from PA and diatomite were also displayed in the spectra of CPCMs.…”

“…The absorptions at 1472 and 1703 cm −1 were assigned to C-C vibrations and C═O stretching vibrations. Besides, 1296, 945, and 730 cm −1 were attributed to the bending vibration of in-plane and out-of-plane, and in-plane winging vibration of -OH in PA. 45,46 Moreover, all of the characteristic absorption peaks from PA and diatomite were also displayed in the spectra of CPCMs. Meanwhile, by comparing the absorption curves of PA and diatomite, no obvious peak shifts were observed in the absorption peaks of the CPCM1-CPCM7, which indicated that no chemical interaction existed and there was good compatibility between PA and diatomite.…”

Shape‐Stabilized PCMs@Foam‐Based Porous Polymers for Thermal Energy Storage

“…This phenomenon was caused by two reasons. Firstly, due to the strong van der Waals force, surface tension, capillary force as well as drag effect between PCMs and pore walls, the crystallization of PCMs in composites was somewhat intervened. Secondly, the lower content of PCMs in compounds affected the phase change temperature as well, which was similar to the PEG/NFMS and 1‐octadecanol/HPP composites system .…”

Synthesis of Lauric-Myristic Acid/Activated Carbon Composite as a New Shape-Stabilized Energy Storage Material

“…Ince et al [24] prepared a myristic acid (MA)/Gr composite material using MA as a thermal energy conversion carrier and Gr was served as a matrix material; their finding when the content of Gr in composite PCM at 2 %, the thermal conductivity increased 38 %. Hu et al [20] investigated 1-Hexadecanol-Palmitic acid (HD-PA)/AC composite developed by vacuum impregnation; the conclusion was that the heat exchange coefficient and thermal stability of the composites were enhanced. Putra et al [16] synthesized beeswax/ multi-wall CNTs composite PCM by the impregnation method; they found that adding multi-wall CNTs can improve the thermal performance and stability of solid and liquid beeswax.…”