Phase change materials based on comb-like polynorbornenes and octadecylamine-functionalized graphene oxide nanosheets for thermal energy storage

Cao, Yufeng; Fan, Di; Lin, S. P.; Mu, Luye; Ng, Flora T. T.; Pan, Qinmin

doi:10.1016/j.cej.2020.124318

Cited by 44 publications

(21 citation statements)

References 47 publications

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“…Additionally, a single diffraction band at around 2θ = 21.6 was also detected for the C18-MMT, indicating that the 1-octadecylamine was successfully inserted and adsorbed into the MMT layers according to the previous investigation. 5,7 This result was consistent with FT-IR analysis. It is also clear that the diffraction peaks of OPCM3 were the same as paraffin, but the diffraction peaks intensities became weak, which was because the crystallinity of paraffin in the composite FSPCMs was hampered by 3D frameworks formed by the entanglement between paraffin and C18-MMT.…”

Section: Chemical Structure and Crystallizing Behavior Of The Composupporting

confidence: 89%

“…1,2 Organic phase-change materials (PCMs) used as LHS devices are an exceptionally promising approach to alleviate these aforementioned concerns by providing reversibly high thermal energy storage (TES) capacities with isothermal operating characteristics during the phase transition process. [3][4][5][6] Recently, organic PCMs, such as paraffin wax, [7][8][9] fatty alcohols, [10][11][12][13] fatty acids, [14][15][16] fatty amines, [17][18][19] and polyethylene glycol, 20,21 have been extensively employed as TES and thermal management systems (TMS) for energy-saving buildings, [22][23][24][25][26] electronic devices, 27,28 lithium-ion batteries, [29][30][31][32] solar energy harvesting plants, 33,34 waste heat recovery, 35 and smart thermos-regulated textiles 36 according to their various merits, such as high Dongli Fan and Yuan Meng contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

“…Paraffin consisting of a high abundance of straightchain alkanes has been commonly used as the favorable organic PCMs for thermal energy conversion and storage systems because of its exceptional merits such as high melting enthalpy, selectable phase-transition temperature, self-nucleating behavior, and safety, nontoxicity, low-cost, good chemical and thermal stability, and so on. 5,37,38 As many other conventional organic PCMs, however, the paraffin cannot be used directly, and the fluidity of paraffin in the molten state is one of the critical technical barriers to the development of highperformance LHS materials, because it not only dramatically drives down TES efficiency and cycling life but also severely cripples surroundings during the phase change.…”

Section: Introductionmentioning

confidence: 99%

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Form‐stable phase‐change materials supported by 1‐octadecylamine‐modified montmorillonite for latent heat storage

et al. 2021

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Form-stable phase-change materials (FSPCMs) are of great significance for relieving the contradiction of energy supply and demand. Unfortunately, the practical application of FSPCMs is severely compromised by their intrinsic drawbacks including lower latent heat storage (LHS) capacities, inferior interfacial compatibility, and cycling durability. Herein, we have provided a group of novel FSPCMs with higher LHS capacities, using paraffin as the LHS materials, which tightly intertwines with the 1-octadecylamine-modified montmorillonite (C18-MMT) under the capillary action as well as induced dipole force due to its n-alkyl chains compatibility. The obtained composite FSPCMs not only exhibit high melting enthalpies (137.56 J/g) but also demonstrate enhanced shape stability and thermal stability. In addition, the composites also render an impressive long-term thermal cycling capability and structure stability even after 100 thermal cycling durability tests, which are believed to have great potential for application in the thermal management of green energysaving buildings.

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Section: Chemical Structure and Crystallizing Behavior Of The Composupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Form‐stable phase‐change materials supported by 1‐octadecylamine‐modified montmorillonite for latent heat storage

et al. 2021

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“…9 b–d) but once the amount is increased, no agglomeration is observed rather than well-defined globular particles (Fig. 9 e–g) 62 .…”

Section: Resultsmentioning

confidence: 91%

Microencapsulation of stearic acid with SiO2 shell as phase change material for potential energy storage

Ishak

Mandal

Lee

et al. 2020

Sci Rep

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Stearic acid (SA) is being used as phase change material (PCM) in energy storage applications. In the present study, the microencapsulation of SA with SiO2 shell was carried out by sol–gel method. Different amounts of SA (5, 10, 15, 20, 30 and 50 g) were taken against 10 ml of tetraethyl orthosilicate (TEOS) for encapsulation. The synthesized microencapsulated PCM (MEPCM) were characterized by Fourier transform infrared spectroscope (FT-IR), X-Ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The characterization results showed that SA was successfully encapsulated by SiO2. Thermogravimetric analysis (TGA) exhibited better thermal stability of the MEPCM than SA. The enthalpy values of MEPCM were found to be unchanged even after 30 heating–cooling cycles by differential scanning calorimetry (DSC). The latent heats of melting and solidification of 50 g SA containing MEPCM were found to be highest i.e. 182.53 J/g and 160.12 J/g, respectively among all microencapsulated samples. The encapsulation efficiency values were calculated using thermal data and the efficiency was found to be highest i.e. 86.68% in the same sample.

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“…Threedimensional (3D) network skeleton, due to high surface area, good electric and heat conductivity, is identified as a promising support material to overcome the limitations of interfacial thermal resistance of discrete, fragmentary nanoshells or fillers. Various architectures [9][10][11][12][13][14][15][16] such as graphene aerogel (GA) 17 , MOFs 18 , porous polymer 5,19 , carbon foam [20][21][22] and BN-based porous scaffolds 23,24 , can not only encapsulate the PCMs but also enhance thermal conductivity. However, the leakage is still unavoidable.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Three-Dimensional Copper@Graphene Phase Change Composite with High Structural Stability and Low Leakage Rate

李晓明¹,

高逸丹²,

孔庆强³

et al. 2021

Acta Physico Chimica Sinica

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Owing to the continuous increase in energy consumption and the growing depletion of traditional fossil fuels, the development of renewable energy is becoming increasingly urgent. Renewable energy has come to the fore, represented by geothermal energy and solar energy. However, the application of these energy sources is highly susceptible to weather, season, location, and time. Thus, these alternative energies are unstable, random, fluctuating, intermittent, and inefficient. The development of energy storage technologies can efficiently solve these problems, storing and releasing energy when needed. Among the key materials used in various energy-storage technologies, phase-change materials (PCMs) are strong candidates for smart thermal energy management and portable thermal energy sectors. As most innate PCMs face issues of low thermal conductivity, environmental pollution, and leakage over their melting point, encapsulating PCMs into supporting materials is necessary. However, these supporting materials face significant challenges in their application. First, skeleton materials should be resistant to the PCM volume changes during melting and solidification processes to achieve suitable structural stability. Second, skeleton materials should also have high thermal conductivity and a low leakage rate. Graphene aerogel (GA) has proven to be an effective supporting skeleton to improve the shape-stability of PCMs; however, the leakage caused by the phase transition and the brittleness of the network structure is a primary problem restricting its application. Skeleton materials play a crucial role in the performance of PCMs. Herein, we propose a double-pulse plating reinforcement strategy for fabricating copper@graphene aerogel (Cu@GA) as a skeleton material for phase change energy. In this design, individual nanosheets of the GA were uniformly covered and interlinked by copper particles. The Cu@GA interlinked networks ensure suitable thermal conductivity and a robust framework, beneficial for phase change heat transfer and leaksuppression performance. In addition, we prepared a PCM composite with high structural stability and low leakage rate by encapsulating octadecylamine (ODA) in Cu@GA through vacuum impregnation to ensure homogeneous ODA dispersion in the Cu@GA porous structure. The influence of different skeletons on the PCM composite leakage rate was investigated by comparing the weight change of the PCM composite. Benefiting from these structural features, the optimized composite phase change material (CPCM) Cu@GA/ODA showed a reduced leakage rate of 19.82% (w, mass fraction) compared to 80.31% (w) of GA/ODA and 72.99% (w) of GOA/ODA after 20 heat storage and release cycles. The cycled skeleton morphology was investigated using scanning electron microscopy to determine the origin of this influence. The skeleton

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Phase change materials based on comb-like polynorbornenes and octadecylamine-functionalized graphene oxide nanosheets for thermal energy storage

Cited by 44 publications

References 47 publications

Form‐stable phase‐change materials supported by 1‐octadecylamine‐modified montmorillonite for latent heat storage

Form‐stable phase‐change materials supported by 1‐octadecylamine‐modified montmorillonite for latent heat storage

Microencapsulation of stearic acid with SiO2 shell as phase change material for potential energy storage

Fabrication of Three-Dimensional Copper@Graphene Phase Change Composite with High Structural Stability and Low Leakage Rate

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