Preparation and characterization of stearic acid/expanded graphite composites as thermal energy storage materials

Fang, Guiyin; Li, Hui; Chen, Zhi; Liu, Xu

doi:10.1016/j.energy.2010.09.046

Cited by 175 publications

(44 citation statements)

References 28 publications

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“…As seen from the spectrum of EV, the peaks located at 3464 cm À1 and 1634 cm À1 are assigned respectively to OH stretching and bending vibration of the interlayer water. The characteristic peak of SiAO stretching vibration is observed at 1012 cm À1 and the peak at 440 cm À1 is attributed to SiAOASi bending vibration of vermiculite [30]. In the spectrum of aEVC, the infrared spectra show more significant alteration at the region below 1250 cm À1 .…”

Section: Characterization Of the Composite Pcmmentioning

confidence: 95%

Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Wei

Xie

et al. 2016

Applied Energy

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Section: Characterization Of the Composite Pcmmentioning

confidence: 95%

Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Wei

Xie

et al. 2016

Applied Energy

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“…This is well-stated that the crystallization of an encapsulated PCM droplet is confined, and the number of nuclei in each droplet decreases compared with that of bulk PCM. [40] The melting enthalpy of MePCMs ranges from 152.23 to 163.67 J g À1 , as listed in Table 1. The percentage of core material was calculated by the enthalpy and listed in Table 1.…”

Section: Si Content In the Shellmentioning

confidence: 99%

Fabrication and performance of microencapsulated phase change materials with hybrid shell by in situ polymerization in Pickering emulsion

Yin

Líu²,

et al. 2015

Polymers for Advanced Techs

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a Microencapsulated phase change materials (MePCMs) using melamine-formaldehyde resin/SiO 2 as shell were investigated in this paper. Organically modified SiO 2 particles were employed to stabilize Pickering emulsion, and in situ polymerization of melamine and formaldehyde was carried out to form hybrid shell. The performances of resultant MePCMs with hybrid shell were investigated comparatively with the MePCMs with polymer shell. SiO 2 particles raise the microencapsulation efficiency by improving the stability of emulsion and providing a precipitation site for melamine-formaldehyde resin. Also, the mechanical strength, thermal reliability, and anti-osmosis performance of MePCMs were improved significantly by SiO 2 particles in the shell. Our study shows that Pickering emulsion is a simple and robust template for MePCMs with polymer-inorganic hybrid shell.

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“…Their thermal conductivity was increased up to 10 % by using an organic fatty acid surfactant such as 5 % sodium myristate, 5 % sodium palmitate, or 5 % sodium stearate (Fauzi et al 2013). Some inorganic materials have high thermal conductivity e.g., graphite and carbon nanomaterials on addition of treated graphite to the PCM increases their thermal properties and thermal conductivity (Ince et al 2015;Sari et al 2008;Sari and Karaipekli 2009;Zhang et al 2013Zhang et al , 2014aZhang et al , b, c, 2015Fang et al 2010;Liu et al 2014;Yuan et al 2014a). Exfoliated graphite (xG) fabricated by exfoliation natural graphite has superior properties mechanical, electrical, and thermal properties (Fukushima et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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Energy is the greatest challenge facing the environment. Energy efficiency can be improved by energy storage by management of distribution networks, thereby reducing cost and improving energy usage efficiency. This research investigated the energy efficiency achieved by adding various types of graphite (e.g., flake and amorphous) to organic-based ternary eutectic mixtures like capric acid (CA)-myristic acid (MA)-palmitic acid (PA)-based composite phase change materials (PCMs) under the assistance of ultrasonication to improve thermal properties for thermal energy storage. The graphite was surface modified under a Fresnel lens by using concentration of solar rays, then exfoliation of flake graphite by solar irradiation (xG-F) and exfoliation of amorphous graphite by microwave irradiation (xG-A). For each type of graphite exfoliation, ternary eutectic mixtures with mass concentrations of 5 wt% were prepared. The structure, thermal energy storage properties, and thermal stability of the composite PCM were investigated. Thermal conductivity of the samples in the liquid phase was measured using the transient line source method (KD2Pro). The thermal conductivity was increased by loading xG while energy storage properties were slightly decreased. Furthermore, CA-MA-PA + 5 % xG-F has a slightly modified phase change temperature and enthalpy of melting (T m = 17.5 °C; ΔH m = 143.7 J/g) and freezing (T f = 6.7 °C; ΔH f = 125.5 J/g); this PCM showed higher thermal conductivity of 0.170 W/(m K), representing an increase of up to 114 % relative to the parent material. On the basis of the above results, xG-A was cheaper than xG-F, but they decrease the energy storage capacity according to DSC results obtained at 2 °C/min. CA-MA-PA/xG-F has more potential for use in low temperature energy storage applications.

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Preparation and characterization of stearic acid/expanded graphite composites as thermal energy storage materials

Cited by 175 publications

References 28 publications

Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Fabrication and performance of microencapsulated phase change materials with hybrid shell by in situ polymerization in Pickering emulsion

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

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