Silica fume/capric acid-palmitic acid composite phase change material doped with CNTs for thermal energy storage

Sarı, Ahmet; Biçer, Alper; Al‐Ahmed, Amir; Al‐Sulaiman, Fahad A.; Zahir, Md. Hasan; Mohamed, Shamseldin A.

doi:10.1016/j.solmat.2017.12.036

Cited by 124 publications

(51 citation statements)

References 51 publications

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“…Sarı et al reported that the thermal conductivity of silica fume/fatty acids eutectic/carbon nanotubes form-stable PCM containing 5.0 wt% carbon nanotubes was 0.47 W/m·K. 47 It can be seen that our result is close to these data. Besides, the density of Ag NWs is much higher than ME and PANI.…”

Section: Latent Heat Storage Properties and Supercooling Suppressionsupporting

confidence: 88%

“…As a result, we believe that the preparation of ME/PANI/Ag NWs form-stable PCM in Figure 11 depicts the thermal conductivity of the ME/PANI/Ag NWs form-stable PCMs. 47 It can be seen that our result is close to these data. The form-stable PCM without Ag NWs (ME/PANI2) exhibited a thermal conductivity of 0.216 W/m·K.…”

Section: Latent Heat Storage Properties and Supercooling Suppressionsupporting

confidence: 88%

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Preparation and characterization of erythritol/polyaniline form‐stable phase change materials containing silver nanowires

et al. 2019

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Summary Sugar alcohols are promising solid‐liquid phase change materials (PCMs). However, problems such as possible leakage of liquid PCMs, high and unstable supercooling, and low thermal conductivity need to be solved. In this work, a novel form‐stable PCM in which m‐erythritol (ME), polyaniline (PANI), and silver nanowires (Ag NWs) were applied as solid‐liquid PCM, supporting material, and thermal conductive filler, respectively, was successfully prepared in anhydrous ethanol by surface polymerization of aniline. Form‐stable PCM with good form stability could be obtained when the ratio of ME/(aniline + ME) was no more than 78.7 wt%. The melting enthalpy (ΔHm) of the ME/PANI form‐stable PCMs could attain 234.8 J/g while that of the ME/PANI/Ag NWs form‐stable PCMs was about 220 J/g. In addition, the thermal conductivity of the form‐stable PCM was increased by 61.6% when 7.5 wt% Ag NW was added. Moreover, the supercooling of ME was effectively suppressed from 100°C for pure ME to 60°C, corresponding to an improvement of 40%, for the form‐stable PCM containing 7.5 wt% Ag NWs. The supercooling suppression could be ascribed to that PANI provided great amounts of nucleating centers and improved the nucleation kinetics, and Ag NWs improved the thermal diffusivity and thus increased the crystallization rate.

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Section: Latent Heat Storage Properties and Supercooling Suppressionsupporting

confidence: 88%

Section: Latent Heat Storage Properties and Supercooling Suppressionsupporting

confidence: 88%

Preparation and characterization of erythritol/polyaniline form‐stable phase change materials containing silver nanowires

et al. 2019

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“…As a matrix, silica, fatty acid, diatomite, expanded perlite, and graphite have been studied extensively. In addition, metal foam, vermiculite, bentonite, and montmorillonite are also well-known [13][14][15][16]. Several research groups have evaluated the use of a polymer as a matrix.…”

Section: Introductionmentioning

confidence: 99%

Shape-Stabilized Phase Change Materials for Solar Energy Storage: MgO and Mg(OH)2 Mixed with Polyethylene Glycol

et al. 2019

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Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)2 were synthesized from the salt Mg(NO3)·6H2O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH3, NH3 with pamoic acid (PA), or (NH4)2CO3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH3 with PA produce single-phase Mg(OH)2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.

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“…However, some studies have found that the phase change materials of fatty acids have some defects, such as inappropriate temperature, low thermal conductivity, and easy leakage of liquid phase for solid–liquid phase transition, 15 , 16 which affect its application scope, development prospects, energy storage, and release efficiency. 17 − 20 Therefore, researchers have carried out relevant studies and proposed corresponding solutions. 21 − 26 If the phase-transition temperature and the thermal conductivity are not appropriate, it can be considered to set a suitable multielement system and the optimize material.…”

Section: Introductionmentioning

confidence: 99%

Study of Phase-Transition Characteristics of New Composite Phase Change Materials of Capric Acid–Palmitic Acid/Expanded Graphite

Fei

Qian

et al. 2020

ACS Omega

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A new composite phase change material of capric acid–palmitic acid/expanded graphite (CA–PA/EG) with the optimum mass ratio of EG equated to 8:1 was prepared by the physical adsorption method. It was observed that the eutectic point of CA–PA binary system was reached at 22.1 °C, and CA–PA was uniformly distributed into the pores of EG by physical interaction. The melting and freezing temperatures of CA–PA/EG obtained by differential scanning calorimeter (DSC) were 23.05 and 20.82 °C, respectively, while the corresponding latent heats were 139.7 and 131.8 J/g, respectively. It had good thermal and chemical stability, and there was almost no leakage of liquid binary phase change materials after 1000 melting–freezing cycles. According to the experimental results of the thermogravimetry (TG) analyzer as well as heat storage and release, CA–PA/EG has excellent thermal reliability and heat resistance and the high thermal conductivity of EG promotes the thermal energy storage and release rate of CA–PA. Thus, CA–PA/EG is suitable as a phase change energy storage material for building energy conservation.

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Silica fume/capric acid-palmitic acid composite phase change material doped with CNTs for thermal energy storage

Cited by 124 publications

References 51 publications

Preparation and characterization of erythritol/polyaniline form‐stable phase change materials containing silver nanowires

Preparation and characterization of erythritol/polyaniline form‐stable phase change materials containing silver nanowires

Shape-Stabilized Phase Change Materials for Solar Energy Storage: MgO and Mg(OH)2 Mixed with Polyethylene Glycol

Study of Phase-Transition Characteristics of New Composite Phase Change Materials of Capric Acid–Palmitic Acid/Expanded Graphite

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