Effect of surface active agent on thermal properties of carbonate salt/carbon nanomaterial composite phase change material

Tao, Y.B.; Lin, C.H.; He, Ya-Ling

doi:10.1016/j.apenergy.2015.07.058

Cited by 56 publications

(6 citation statements)

References 28 publications

(36 reference statements)

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“…However, common PCM candidates such as paraffin [9,10], salt-hydrates [11], sugar alcohol [12,13], and molten salts [14,15] have thermal conductivities that are too low for practical application in TES systems. Generally, organic PCMs have conductivity values less than 0.4 Wm -1 K -1 and those of inorganic PCMs are less than 1.0 Wm -1 K -1 [8].…”

Section: Introductionmentioning

confidence: 99%

High thermal conductivity phase change composite with a metal-stabilized carbon-fiber network

et al. 2016

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To enhance the thermal conductivity of phase change materials (PCM) such as sugar alcohol and molten salts, the preparation of a phase change composite (PCC) with a PCM and a filler with high thermal conductivity has been widely investigated. Although many reported PCCs have high thermal conductivity, the stability during thermal cycling endurance is often too low for practical use. This paper describes the development of a PCC with both high thermal conductivity and high cyclic durability. The PCCs were prepared by a hot-pressing method. Erythritol (melting point: 118°C, thermal conductivity: 0.73 Wm-1 K-1) was used as a PCM, and carbon fiber (thermal conductivity: 900 Wm-1 K-1 in the fiber direction) and indium particles (thermal conductivity: 82.8 Wm-1 K-1) were used as the high thermal conductivity fillers. The effective thermal conductivity of the PCC was measured using the laser flash method and the network structures were analyzed using energy dispersive spectroscopy and scanning electron microscopy. Thermal cycling tests through the melting and solidification phases of the erythritol were performed to investigate the cyclic durability of the PCCs. We found that the indium particles melted during hot pressing, welding together the carbon fiber to produce a stable percolating network, which significantly enhanced the thermal conductivity and cyclic endurance of the PCCs.

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Section: Introductionmentioning

confidence: 99%

High thermal conductivity phase change composite with a metal-stabilized carbon-fiber network

et al. 2016

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“…Both PEG 6000 and MWCNTs-OH reacted with NCOTEOS in a coupling reaction that lasted for two hours at 80 °C under 250 rpm mechanical stirring in an inert nitrogen environment. Tao et al previously reported the useful application of SDS as a surface active agent for a better dispersion of CNTs in PEG [ 45 ]. At this moment, we anticipated that PEG 6000 -Si silica building blocks could be found in the flask, arising from the coupling of PEG 6000 with NCOTEOS, free PEG 6000 , thermoconductive filler coupled with NCOTEOS (MWCNT-Si), and possibly free thermoconductive filler.…”

Section: Methodsmentioning

confidence: 99%

Novel PEG6000–Silica-MWCNTs Shape-Stabilized Composite Phase-Change Materials (ssCPCMs) for Thermal-Energy Storage

et al. 2023

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This paper describes the preparation of new PEG6000–silica-MWCNTs composites as shape-stabilized phase change materials (ssPCMs) for application in latent heat storage. An innovative method was employed to obtain the new organic–inorganic hybrid materials, in which both a part of the PEG chains, used as the phase change material, and a part of the hydroxyl functionalized multiwall carbon nanotubes (MWCNTs-OH), used as thermo-conductive fillers, were covalently connected by newly formed urethane bonds to the in-situ-generated silica matrix. The study’s main aim was to investigate the optimal amount of PEG6000 that can be added to the fixed sol–gel reaction mixture so that no leakage of PEG occurs after repeated heating–cooling cycles. The findings show that the optimum PEG6000/NCOTEOS molar ratio was 2/1 (~91.5% PEG6000), because both the connected and free PEG chains interacted strongly with the in-situ-generated silica matrix to form a shape-stabilized material while preserving high phase-transition enthalpies (~153 J/G). Morphological and structural findings obtained by SEM, X-ray and Raman techniques indicated a distribution of the silica component in the amorphous phase (~27% for the optimum composition) located among the crystalline lamellae built by the folded chains of the PEG component. This composite maintained good chemical stability after a 450-cycle thermal test and had a good storage efficiency (~84%).

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“…In these studies, [43,[54][55][56][57]60,67,70,98,[118][119][120][121] dispersants have been used to make the nano particle/tube enhanced PCMs more stable. The dispersants are organic molecules that prevents cluster formation and modifies the nanoparticles surface properties [122].…”

Section: Surfactants Additionmentioning

confidence: 99%

Characteristics and potential applications of nano-enhanced phase change materials: A critical review on recent developments

Hayat

Chen

Bevilacqua

et al. 2022

Sustainable Energy Technologies and Assessments

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Effect of surface active agent on thermal properties of carbonate salt/carbon nanomaterial composite phase change material

Cited by 56 publications

References 28 publications

High thermal conductivity phase change composite with a metal-stabilized carbon-fiber network

High thermal conductivity phase change composite with a metal-stabilized carbon-fiber network

Novel PEG6000–Silica-MWCNTs Shape-Stabilized Composite Phase-Change Materials (ssCPCMs) for Thermal-Energy Storage

Characteristics and potential applications of nano-enhanced phase change materials: A critical review on recent developments

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