Effect of organic phase change material and surfactant on HCFC141b hydrate nucleation in quiescent conditions

Zhou, Linchen; Sun, Zhaolin; Lu, Lei; Li, Juan; Li, Cuimin; Huang, Haifeng

doi:10.1016/j.ces.2020.115976

Cited by 11 publications

(4 citation statements)

References 46 publications

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“…It is shown that supercooling of DHPD was reduced from 8.3 to 2.8 °C in DHPD-Gel, which is attributed to the thickening effect of the sodium polyacrylate crosslinking network. Further improvement was achieved with EmulGel (1:3), where supercooling was eliminated, possibly due to the heterogeneous nucleation effect of Span80, F-SiO 2 , or eicosane. , The decrease in the degree of supercooling is also confirmed by the fact that the DHPD in EmulGel (1:3) readily crystallized when cooled from its melt to 20 °C and that it showed a nearly identical melting peak compared to when the sample was cooled to −10 °C (Figure e). Pure DHPD did not show any melting peak when reheated from 20 °C (see Figure f).…”

Section: Resultsmentioning

confidence: 81%

Highly Stable and Nonflammable Hydrated Salt-Paraffin Shape-Memory Gels for Sustainable Building Technology

Zhang

Wang

Duvigneau

et al. 2021

ACS Sustainable Chem. Eng.

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Hydrated salts (salt hydrates) are highly promising low-temperature phase change materials (PCMs) due to their high cohesive energy density and low cost. However, they exhibit phase separation, liquid leakage, and inherent supercooling, which hinder their applications in sustainable building technology. Here, we describe the design of a highly stable emulsion gel system (EmulGels) that exhibits nonflammable and shape-memory characteristics. Oleophilic paraffin and hydrophilic hydrated salts, both of which are excellent PCMs typically existing in separate phases, are combined harmoniously in a gel by a templating water-in-oil Pickering emulsion. Latent heat values of the prepared EmulGels were up to 213.2 J/g (eicosane/disodium hydrogen phosphate dodecahydrate = 1:3). No leakage of eicosane was noticed after heating the EmulGels at 60 °C for 30 min, and the latent heat value remained almost unchanged following 500 thermal cycles. The EmulGel was specifically designed to enable dual-phase crosslinking, which effectively enhanced its shape stability, slowed down loss of water of crystallization in hydrated salts, and decreased the degree of supercooling. Nonflammable characteristic typically found in hydrated salts was also exhibited by the EmulGel, in combination with good mechanical properties. The materials characteristics make EmulGels ideal candidates to serve as building construction interlayers for effective thermal building management.

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Section: Resultsmentioning

confidence: 81%

Highly Stable and Nonflammable Hydrated Salt-Paraffin Shape-Memory Gels for Sustainable Building Technology

Zhang

Wang

Duvigneau

et al. 2021

ACS Sustainable Chem. Eng.

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“…Promoters include kinetic promoters − and thermodynamic promoters. − Thermodynamic promoters usually improve the equilibrium conditions of hydrate formation by filling hydrate cages and increase the driving force of hydrate formation. Delahaye et al studied the effect of tetrahydrofuran (THF) with a mass concentration of 3.98–15.00 wt % on the equilibrium conditions of CO 2 hydrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of HFE254 or Cyclopentanone on Phase Equilibrium Dissociation Conditions for Carbon Dioxide Hydrate

Song

Sun

et al. 2021

J. Chem. Eng. Data

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Hydrate equilibrium conditions of the CO2 + HFE254 or cyclopentanone + water system are determined by the isometric method. The presence of cyclopentanone promotes CO2 hydrate formation, while HFE254 does not affect the equilibrium pressure of CO2 hydrate. The hydrate dissociation temperature of the CO2 + cyclopentanone system increases as the pressure increases. However, the hydrate equilibrium temperature gradually decreases when pressure is above 3.2 MPa and a mixed hydrate of structure I and structure II forms. It can be seen that cyclopentanone is a thermodynamic accelerator that can promote the formation of CO2 hydrate.

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“…Microspheres can be prepared via the O/W Pickering route 45 , which could be hotpressed to make composite films 32 . If W/O systems are utilized, porous polymer materials can be obtained 46 .…”

Section: Preparation Approachesmentioning

confidence: 99%

“…The molten aqueous phase remained confined inside the gel due to the efficient sealing by the internal hydrophilic polymer network and eicosane acting as a powerful sealant. EmulGel (1:3), where supercooling was eliminated, possibly due to the heterogeneous nucleation effect of Span80, F-SiO2, or eicosane [44][45] . The decrease in degree of supercooling is also confirmed by the fact that the DHPD in EmulGel (1:3) readily crystallized when cooled from its melt to 20 ℃ and that it showed a nearly identical melting peak compared to when the sample was cooled to -10 ℃ (Figure 7.3e).…”

Section: Water Retention Ability and Degree Of Supercooling Of Emulgelsmentioning

confidence: 99%

Pickering emulsions as enabling platforms for designer polymer-based hybrid materials

Zhang

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may be reproduced, stored in a retrieval system or transmitted in any form or by any means without permission of the author. Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd, in enige vorm of op enige wijze, zonder voorafgaande schriftelijke toestemming van de auteur. 12 physical morphologies (microspheres, fibers, films and porous matrices). Finally, we offer an outlook for future developments.

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Effect of organic phase change material and surfactant on HCFC141b hydrate nucleation in quiescent conditions

Cited by 11 publications

References 46 publications

Highly Stable and Nonflammable Hydrated Salt-Paraffin Shape-Memory Gels for Sustainable Building Technology

Highly Stable and Nonflammable Hydrated Salt-Paraffin Shape-Memory Gels for Sustainable Building Technology

Effect of HFE254 or Cyclopentanone on Phase Equilibrium Dissociation Conditions for Carbon Dioxide Hydrate

Pickering emulsions as enabling platforms for designer polymer-based hybrid materials

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