Facile preparation and adjustable thermal property of stearic acid–graphene oxide composite as shape-stabilized phase change material

Li, Benxia; Liu, Tongxuan; Hu, Luyang; Wang, Yanfen; Nie, Shibin

doi:10.1016/j.cej.2012.11.077

Cited by 169 publications

(66 citation statements)

References 40 publications

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“…4, for the TAMSNs, the band at 3421 cm À1 was due to the stretching vibration of the hydroxyl groups. 25,26 The peaks at 1095 cm À1 and 457 cm À1 represented the bending vibration of the Si-O-Si functional groups.…”

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Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

et al. 2017

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Tannic-acid-templated mesoporous silica nanoparticles (TAMSNs), which were synthesized using a simple, environmentally friendly, cost-effective, and nonsurfactant-based template method, were developed as a matrix for stearic acid to fabricate a novel shape-stabilized phase change material (SA/TAMSN). The characterization results showed that stearic acid was fully adsorbed on the TAMSNs by physical adsorption and the TAMSNs had no effect on the crystal structure of stearic acid. According to the DSC results, although the TAMSNs had a confinement effect on the activity of the stearic acid molecules, the fusion and solidification enthalpies of SA/TAMSN could reach 108.8 J g À1 and 114.1 J g À1, respectively.Additionally, the TGA thermograms indicated that there was no apparent weight loss from 20 C to 223 C for SA/TAMSN, which demonstrated that SA/TAMSNs have excellent thermal stability. All of the results suggested that the TAMSNs could be used as a promising matrix candidate for the shape stabilization of stearic acid.

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Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

et al. 2017

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“…Figure 12 is the corresponding variation diagram of density and specific gravity with circulations proceeding. According to Table 6, the range of density under 25℃ is 1.45820 g/cm 3 -1.49463 g/cm 3 . As for specific gravity, the range is 1.46252 g/cm 3 -1.49906 g/cm 3 .…”

Section: Dscmentioning

confidence: 99%

“…According to Table 6, the range of density under 25℃ is 1.45820 g/cm 3 -1.49463 g/cm 3 . As for specific gravity, the range is 1.46252 g/cm 3 -1.49906 g/cm 3 . With the help of Figure 12, the density of the modified inorganic PCM before cycling decreases sharply from 1.49463 g/cm 3 to 1.48555g/cm 3 after 10 cycles and further reduces to 1.45820g/cm 3 after 30 cycles, which means the total mass of the sediments may be the largest after 30 cycles.…”

Section: Dscmentioning

confidence: 99%

“…As the core of energy storage technology, phase change materials(PCMs) can effectively store or release a great amount of latent heat during the process of phase change. In addition, PCMs have already attracted enormous attention to investigators owing to their high energy storage density, isothermal operating process and quite small temperature variation [3][4]. PCMs are divided into organic PCMs, inorganic PCMs and eutectic PCMs according to inherent properties of the materials [5].…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC

Yang

Zhang

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. By means of mass ratio method, binary eutectic hydrated salts inorganic phase change thermal energy storage system CaCl2·6H2O-20wt% MgCl2·6H2O was prepared, and through adding nucleating agent 1wt% SrCl2·6H2O and thickening agent 0.5wt% carboxy methyl cellulose (CMC), inoganic phase change material (PCM) modified was obtained. With recording cooling-melting curves simultaneously, this PCM was frozen and melted for 100 cycles under programmable temperature control. After per 10 cycles, the PCM was charaterized by differential scanning calorimeter (DSC), X-ray diffraction (XRD) and density meter, then analysing variation characteristics of phase change temperature, supercooling degree, superheat degree, latent heat, crystal structure and density with the increase of cycle index. The results showed that the average values of average phase change temperature for cooling and heating process were 25.70℃ and 27.39℃ respectively with small changes. The average values of average supercooling and superheat degree were 0.59℃ and 0.49℃ respectively, and the maximum value was 1.10℃. The average value and standard deviation of latent heat of fusion were 120.62 J/g and 1.90 J/g respectively. Nonmolten white solid sediments resulted from phase separation were tachyhydrite (CaMg2Cl6·12H2O), which was characterized by XRD. Measuring density of the PCM after per 10 cycles, and the results suggested that the total mass of tachyhydrite was limited. In summary, such modified inoganic PCM CaCl2·6H2O-20wt% MgCl2·6H2O-1wt% SrCl2·6H2O-0.5wt% CMC could stay excellent circulation stability within 100 cycles, and providing reference value in practical use.

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“…Previous researches have been demonstrated that the phase change temperatures of nanoconfined materials decrease [24][25][26]. In nanoconfined systems,the decrease in the phase change temperatures of organic PCMs are due to the confined subnanometerspaces that become narrower [27].…”

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Preparation of Stearic Acid/Graphene oxide Based Form-Stable Composite Phase Change Materials

Oktay

2018

Marmara Fen Bilimleri Dergisi

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Composite phase change materials (PCM) of stearic acid/graphene oxide were prepared by thiol-alkyne click coupling reaction.Stearic acid was firstly modified with propargyl to introduce thiol-yneclickable sites. Different amounts of graphene oxide were added to thiol-alkyne clickable formulation. To evaluate phase change properties of PCMs differential scanning calorimeter (DSC) was used. Thermal stability and degradation profiles of PCMs were investigated. The structural characterization of stearic propargyl ester and PCMs was performed by ATR-FTIR spectroscopy. The addition of graphene oxide increased the maximum weigh loss temperature from 328 to 351 ˚C with respect to the base formulation. Moreover, the crosslinking of stearic acid prevented the leakage of PCMs. Keywords: Phase change materials, thiol-yne click, graphene oxide ÖzStearik asit-grafen oksit kompozit faz değişim malzemeleri (PCM) tiyol-alkin klik kapanma reaksiyonu ile hazırlandı. Öncelikle stearik asit tiyol-yne klik gruplarının bağlanması amacıyla modifiye edildi. Farklı miktarlarda grafen oksit tiyol-klik formülasyonuna eklendi. PCM'lerin faz değişim özelliklerini incelemek için diferansiyel taramalı kalorimetre (DSC) kullanıldı. PCM'lerin termal kararlılık ve bozunma profil incelendi. Stearik propargyl esteri ve PCM'lerin yapısal karakterizasyonu ATR-FTIR spektroskopisi ile gerçekleştirildi. Grafen oksit eklenmesiyle baz formülasyona göre maksimum kütle kaybı sıcaklığı 328 dan 351 ˚C ye yükseldi. Aynı zamanda stearik propargyl çapraz bağlanmasıyla PCM'lerin akma problem engellendi.

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Facile preparation and adjustable thermal property of stearic acid–graphene oxide composite as shape-stabilized phase change material

Cited by 169 publications

References 40 publications

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC

Preparation of Stearic Acid/Graphene oxide Based Form-Stable Composite Phase Change Materials

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Facile preparation and adjustable thermal property of stearic acid–graphene oxide composite as shape-stabilized phase change material

Cited by 169 publications

References 40 publications

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Experimental studies on cycling stable characteristics of inorganic phase change material CaCl2·6H2O-MgCl2·6H2O modified with SrCl2·6H2O and CMC

Preparation of Stearic Acid/Graphene oxide Based Form-Stable Composite Phase Change Materials

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Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC