Confinement effects on the phase transition temperature of aqueous NaCl solutions: The extended Gibbs–Thomson equation

Burba, Christopher M.; Janzen, Jonathan

doi:10.1016/j.tca.2015.07.013

Cited by 22 publications

(20 citation statements)

References 28 publications

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“…As shown in Figure 6a, the PCE-CPCMs exhibited similar endothermic and exothermic characteristics as PEG. However, the phase change temperature of all the PCE-CPCMs was lower than PEG, which could be explained by the Gibbs-Thomson equation and a physical interaction-induced decrease in phase change temperature [27,28,29,30,31]. Moreover, the DSC curves of both the melting and solidification processes of the PCE-CPCMs regularly shifted toward the higher temperature direction with the decrease in EVM content (Figure 6), revealing that the heat storage behavior of PCE-CPCMs was significantly affected, which might have been caused by the different degrees of pore confinement and surface interactions of EVM.…”

Section: Resultsmentioning

confidence: 99%

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

Deng

et al. 2018

Polymers

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Polyethylene glycol (PEG)-carbon nanotubes (CNTs) with expanded vermiculite (EVM) form-stable composite phase change materials (PCE-CPCMs) were constructed via the efficient synergistic effect between EVM and CNTs. The resultant material demonstrated simultaneously enhanced latent heat and heat transfer. The unique EVM pore structure and CNTs surfaces contributed to the form stability of PCE-CPCMs. The adsorption capacity was 77.75–81.54 wt %. The latent heat of the PCE-CPCMs increased with increasing CNTs content due to the decreasing inhibition effect of EVM and the increasing adsorption capacity of PEG, which was 83.9 J/g during melting and 104.2 J/g during solidification for PCE7.09. The pore confinement and surface EVM interactions inhibited the heat storage capacity of the PCE-CPCMs. Moreover, the inhibition effect on the heat storage capacity of PCE-CPCMs during the melting process was stronger than during solidification due to the crystallization-promoting effect. The heat transfer of PCE-CPCMs was significantly enhanced by the CNTs filler (0.5148 W/(m·K) for PCE7.09) due to the decrease in interfacial thermal resistance and the formation of rapid thermally conductive pathways. Fourier transform infrared spectroscopy, thermogravimetric analysis, and thermal cycles test results confirmed that the PCE-CPCMs exhibited excellent chemical compatibility, thermal stability, and reliability.

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Section: Resultsmentioning

confidence: 99%

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

Deng

et al. 2018

Polymers

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“…For SD/E, the phase change temperatures were 23.5 and 11.5 • C, respectively. It could be found that the melting temperature of SD/E is lower than SD; this phenomenon can be explained by Gibbs-Thomson Equation (8) [36,38].…”

Section: R= H / H × 100%mentioning

confidence: 94%

Design of Eutectic Hydrated Salt Composite Phase Change Material with Cement for Thermal Energy Regulation of Buildings

Liu

Yang

et al. 2020

Materials

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An energy-efficient eutectic hydrated salt phase change material based on sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate (SD) was prepared. Then, SD was encapsulated into expanded graphite (EG) to produce form-stable composite phase change materials (SD/E), which indicated a positive effect on preventing the leakage of SD, decreasing the supercooling and improving the thermal conductivity. SD/E was further tested for thermal efficiency by simulating the indoor environment with a house-like model which was composed of SD/E and magnesium oxychloride cement. The results showed an excellent thermal insulation effect. This exciting porous composite phase shift material reveals possible architectural applications because of the attractive thermos-physical properties of SD/E.

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“…This conclusion is the main novelty with respect to the existing literature. Indeed, in previous studies, the concentration of the whole confined solution was expected to vary on approaching the liquidus line because of eutectic freezing, solute precipitation, solute rejection, and the presence of an extra reservoir of liquid. − On the contrary, the glass-forming ability of glycerol demonstrates that the eutectic point did not play any role. The fact that the whole composition of the confined liquid at T m conf could be different from the mother solution due to external ice freezing or to the solutes exclusion from the pores can be also safely ruled out in this study.…”

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confidence: 96%

“…One the other hand, in the limit of high dilution, an enhancement of the cryoscopic effect under confinement was shown for NaCl solutions in SBA-15 and MCM-41 and benzene–toluene mixtures in SBA-15 . The former study was complemented by Jantsch et al in the range of higher concentrations for CaCl 2 and LiCl solutions confined in SBA-15 and MCM-41 mesoporous silicates .…”

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confidence: 99%

“…As a whole, the phase behavior of confined solutions and binary liquids remains unclear. This is especially relevant for pore sizes of only a few nanometers (i.e., R p < 5 nm) where experimental observations of the liquidus line are missing, since existing studies were either restricted to the limit of high dilution or unrelated to the liquidus line itself because of eutectic freezing and solute exclusion. ,, Besides, other specific phenomena have been invoked to interpret experimental observations in the presence of excess liquid, such as the variation of the ice–liquid surface tension as a function of the composition, the unexpected exclusion of ions from small pores, and the effects of secondary confinement or the precipitation of solute nanocrystals …”

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confidence: 99%

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Extension and Limits of Cryoscopy for Nanoconfined Solutions

Malfait

Pouessel

Jani

et al. 2020

J. Phys. Chem. Lett.

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Confinement effects on the phase transition temperature of aqueous NaCl solutions: The extended Gibbs–Thomson equation

Cited by 22 publications

References 28 publications

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

Design of Eutectic Hydrated Salt Composite Phase Change Material with Cement for Thermal Energy Regulation of Buildings

Extension and Limits of Cryoscopy for Nanoconfined Solutions

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