Shape-stabilized phase change materials: Performance of simple physical blending synthesis and the potential of coconut based materials

Muchtar, Ahmad Rifqi; Hassam, Christopher L.; Srinivasan, Bhuvanesh; Berthebaud, David; Mori, Toshiyuki; Soelami, Nugroho; Yuliarto, Brian

doi:10.1016/j.est.2022.104974

Cited by 21 publications

(10 citation statements)

References 48 publications

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“…22,23 Thus, making full use of this part of energy is of great signicance to improve the utilization efficiency of solar energy and alleviate the energy crisis. However, the implementation of STEGs in the marine environment is hampered by several limiting factors originating from photothermal phase change energy storage units, [24][25][26] including low photothermal conversion capability, 27 insufficient shape stability during phase transition, 28,29 and poor underwater stability. 30 In addition, most of the composite PCMs previously reported in the literature lack exibility, [31][32][33][34][35] giving rise to low adaptability to large-scale assembly of STEGs 36 and application in various scenarios.…”

Section: Introductionmentioning

confidence: 99%

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

et al. 2023

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“…Owing to surface tension and capillary forces, micropores and mesopores are the most suitable kinds of nanoscale structures . The carbon material produced under the conditions determined by the OC1 model had mostly micropores (774.9 m 2 /g) and mesopores (640.4 m 2 /g) that are suitable as supporting material for PCM applications …”

Section: Resultsmentioning

confidence: 99%

“…45 The carbon material produced under the conditions determined by the OC1 model had mostly micropores (774.9 m 2 /g) and mesopores (640.4 m 2 /g) that are suitable as supporting material for PCM applications. 60 Intensity of the peaks found in the FTIR spectra of the materials produced under the process conditions determined by both OC1 and OC2 models were weaker than those of the unprocessed biomass, Figure S3a,b. The latter result can be explained by the effect of carbonization and activation on the functional groups in the material.…”

Section: Characterization Of the Carbon Produced Atmentioning

confidence: 99%

Miscanthus-Derived Energy Storage System Material Production

2023

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Carbon derived from various biomass sources has been evaluated as support material for thermal energy storage systems. However, process optimization of Miscanthus-derived carbon to be used for encapsulating phase change materials has not been reported to date. In this study, process optimization to evaluate the effects of selected operation parameters of pyrolysis time, temperature, and biomass:catalyst mass ratio on the surface area and pore volume of produced carbon is conducted using response surface methodology. In the process, ZnCl2 is used as a catalyst to promote high pore volume and area formation. Two sets of optimum conditions with different pyrolysis operation parameters in order to produce carbons with the highest pore area and volume are determined as 614 °C, 53 min, and 1:2 biomass to catalyst ratio and 722 °C, 77 min, and 1:4 biomass to catalyst ratio with 1415.4 m2/g and 0.748 cm3/g and 1499.8 m2/g and 1.443 cm3/g total pore volume, respectively. Carbon material produced at 614 °C exhibits mostly micro- and mesosized pores, while carbon obtained at 722 °C comprises mostly of meso- and macroporous structures. Findings of this study demonstrate the significance of process optimization for designing porous carbon material to be used in thermal and electrochemical energy storage systems.

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“…[3][4][5] However, poor shape stability and leakages associated with low thermal conductivity still considerably hinder their practical applications. [5,6] Currently, the strategy for shape stabilization of LSPCMs can be divided into the following: a) the physical blending of liquid state phase change materials (PCMs) with a porous material to form a shape-stabilized composite owing to the capillary force of porous materials; [7] b) encapsulation of PCMs in capsules with various sizes to prevent liquid beneficial for adsorbing various PCMs with high stability. [20] Liu et al succeeded in growing a knitting aryl network on the skeleton of copper to adjust the surface characteristics of copper foam and accomplished a 62.1% encapsulation for paraffin.…”

Section: Introductionmentioning

confidence: 99%

“…[ 3–5 ] However, poor shape stability and leakages associated with low thermal conductivity still considerably hinder their practical applications. [ 5,6 ] Currently, the strategy for shape stabilization of LSPCMs can be divided into the following: a) the physical blending of liquid state phase change materials (PCMs) with a porous material to form a shape‐stabilized composite owing to the capillary force of porous materials; [ 7 ] b) encapsulation of PCMs in capsules with various sizes to prevent liquid leakage during the phase transition process; [ 8 ] c) fabrication shape stabilization via a chemical grafting strategy on some functional group active materials; [ 9,10 ] and d) electrospinning strategy. [ 11 ] Among the numerous reports on the shape stabilization of PCMs, the physical blending method stands out because of its practical operation technique and almost no waste emissions.…”

Section: Introductionmentioning

confidence: 99%

Phase Change Thermal Energy Storage Enabled by an In Situ Formed Porous TiO₂

Liu

Xiao

Zhao

et al. 2022

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leakage during the phase transition process; [8] c) fabrication shape stabilization via a chemical grafting strategy on some functional group active materials; [9,10] and d) electrospinning strategy. [11] Among the numerous reports on the shape stabilization of PCMs, the physical blending method stands out because of its practical operation technique and almost no waste emissions. [12][13][14] However, the capillary force, which plays a critical role in the adsorption of liquid-state PCMs, results in challenges for the complete adsorption of liquid PCMs owing to the inherent surface tension between the liquid and solid interfaces. Herein, for the first time, we use the practical operation and no-emission advantages of the physical blending method, avoiding the energy storage density shrinkage resulting from the uneven adsorption caused by capillary force.Capillary force, which dominates the adsorption capacity of supporting materials toward LSPCMs, can be calculated via the Young-Laplace equation: [15] ρ θ = 2 cos / p r (1)where p, ρ, θ, and r are the capillary force, the surface tension of melted PCMs, the wetting angle between PCMs and supporting material, and the radius of the supporting material pore, respectively. If the pore size of the supporting material is small, the capillary force may be sufficient to maintain the liquid PCMs in the phase transition cycles, leading to better thermal reliability and stability. Therefore, micro/nanoscale pores are good choices for the shape-stabilization of PCMs and for enhancing the thermal reliability of PCMs because of the strong capillary force. [7,16] In contrast, surface tension inhibits complete contacting or entry between supporting materials and PCMs, resulting in an air chamber, which decreases the energy storage density and thermal interfaces, making the physical blending method less desirable (Figure 1). [17,18] Manipulating surface characteristics on porous materials is a common way to enhance the compatibility between supporting materials and PCMs. [17] For example, Wang et al. found that dopamine can be adopted to modify the surface of expanded vermiculite (EVM) to promote the phase change behavior and improve the heat storage characteristics of polyethylene glycol (PEG)/ EVM-dopamine (EVMX) form-stable composite. [19] Zhang et al. realized that modifying the surface polarity of copper foam with superhydrophobic/superhydrophilic properties would be Uneven and insufficient encapsulation caused by surface tension between supporting and phase change materials (PCMs) can be theoretically avoided if the encapsulation process co-occurs with the formation of supporting materials in the same environment. Herein, for the first time, a one-pot one-step (OPOS) protocol is developed for synthesizing TiO 2 -supported PCM composite, in which porous TiO 2 is formed in situ in the solvent of melted PCMs and directly produces the desired thermal energy storage materials with the completion of the reaction. The preparation features straightforward operation and high environ...

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Shape-stabilized phase change materials: Performance of simple physical blending synthesis and the potential of coconut based materials

Cited by 21 publications

References 48 publications

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Miscanthus-Derived Energy Storage System Material Production

Phase Change Thermal Energy Storage Enabled by an In Situ Formed Porous TiO₂

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Shape-stabilized phase change materials: Performance of simple physical blending synthesis and the potential of coconut based materials

Cited by 21 publications

References 48 publications

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Miscanthus-Derived Energy Storage System Material Production

Phase Change Thermal Energy Storage Enabled by an In Situ Formed Porous TiO2

Contact Info

Product

Resources

About

Phase Change Thermal Energy Storage Enabled by an In Situ Formed Porous TiO₂