Preparation, Properties, and Supercooling Prevention of Phase Change Material <i>n</i>-Octadecane Microcapsules with Peppermint Fragrance Scent

Wu, Qian; Zhao, Di; Jiao, Xin; Zhang, Yao; Shea, Kenneth J.; Lu, Xihua; Qiu, Gao

doi:10.1021/acs.iecr.5b01074

Cited by 56 publications

(20 citation statements)

References 23 publications

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“…The result showed that Mg 3 BTC 2 ‐ and Ca 3 BTC 2 are the best nucleating agents. Nano‐copper, graphite nanoparticles, expanded graphite, and multi‐walled carbon nanotubes can also serve as the nucleating agents for PCMs. Besides, researchers added nucleating agents into microencapsulated PCMs to decrease their supercooling.…”

Section: Introductionmentioning

confidence: 99%

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

et al. 2018

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Summary Polyethylene glycol (PEG) is a kind of phase change material with high phase change enthalpy and good compatibility with the environment. However, there is relatively large supercooling for PEG, limiting their practical applications. To reduce their supercooling degree, herein we use three different small molecules (acryloyl chloride, acetyl chloride, and thionyl chloride) to modify PEG and study the effects of different end group modification on their phase change properties. Fourier‐transform infrared (FTIR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopy are used to confirm the molecular structure of the PEG with different molecular weights and functionalities after chemical modification. Crystal structures of the PEG before and after the modification are verified by X‐ray diffractometry (XRD) method and show no change. Differential scanning calorimetry (DSC) results show that the end group modification is quite effective for mitigating the supercooling of PEG with double ‐OH end groups but not effective for PEG with mono ‐OH end group. The mechanism for the change of supercooling behavior is proposed. The costs of different modification methods are estimated and compared.

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Section: Introductionmentioning

confidence: 99%

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

et al. 2018

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“…According to the correlation between the phase‐change enthalpies and the content of n‐octadecane in the microcapsules, the yield of microcapsules ( η ) and the encapsulation efficiency ( E en ) which represented the fabrication efficiency and the loading of n‐octadecane within the microcapsules were also counted as follows:

η = \frac{W_{micro}}{W_{octa} + W_{RSF}} \times 100 %

E_{en} = \frac{W_{micro}}{W_{octa}} \times \frac{Δ H_{m, micro}}{Δ H_{m, octa}} \times 100 %

where W micro , W octa, and W RSF represented the weight of the resultant microcapsules, n‐octadecane and RSF in the synthetic process, respectively, Δ H m,micro and Δ H m,octa denoted the fusion enthalpy of the encapsulated n‐octadecane in the microcapsules and the bulk n‐octadecane, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of regenerated silk fibroin‐based heat‐management sponge for wound healing

Liu

Zhao

Wang

et al. 2019

J of Applied Polymer Sci

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In the present study, a regenerated silk fibroin (RSF) sponge incorporated with the phase change microcapsules were synthesized by facile and effective routes. The microcapsules with the phase change materials (PCMs) core and the RSF wall were prepared by simple coacervation. By altering the synthesis parameters including the emulsifier concentration and the RSF concentration, the microcapsules exhibiting optimized spherical geometry, high encapsulation efficiency, high phase change enthalpies, good thermal cycling performance, and high thermal stability were synthesized. As to the preparation of the microstructurally aligned RSF sponge, a new type of freeze–thaw method was used for the first time, the resultant sponge exhibited high elastic resilience. Subsequently, the combination of microcapsules with the RSF sponge was achieved by a convenient deposition method with the aid of ultrasonic agitation, which showed well maintained porous structure and satisfactory phase change enthalpies of 23.16 and 23.32 J•g−1 corresponding to the heating and cooling process, respectively. Therefore, the PCMs‐incorporated RSF sponge exhibited the capacity to regulate the temperature in order to create a stable “microclimate.” Regarding the exceptional biocompatibility, biodegradability, and super comfort of RSF materials, the RSF‐based sponge can be an ideal candidate for wound dressing applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48173.

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“…Supercooling will lead a longer thermal discharge time and casts significant effects on the overall thermal performance of PCM microcapsules [122]. To suppress this phenomenon, Wu et al added 1-tetradecanol and paraffin into the oil phase of n-octadecane@polyurea microcapsules as nucleation agents [123]. However, the supercooling degree further increased as 1-tetradecanol increased from 8.3 wt.% to 12.5 wt.%, and paraffin encapsulated into core materials was helpful for promoting the formation of triclinic crystal l in n-octadecane.…”

Section: Ermal Characterizationmentioning

confidence: 99%

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Peng

Dou

et al. 2020

Advances in Polymer Technology

197

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Phase change materials (PCMs) are gaining increasing attention and becoming popular in the thermal energy storage field. Microcapsules enhance thermal and mechanical performance of PCMs used in thermal energy storage by increasing the heat transfer area and preventing the leakage of melting materials. Nowadays, a large number of studies about PCM microcapsules have been published to elaborate their benefits in energy systems. In this paper, a comprehensive review has been carried out on PCM microcapsules for thermal energy storage. Five aspects have been discussed in this review: classification of PCMs, encapsulation shell materials, microencapsulation techniques, PCM microcapsules’ characterizations, and thermal applications. This review aims to help the researchers from various fields better understand PCM microcapsules and provide critical guidance for utilizing this technology for future thermal energy storage.

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Preparation, Properties, and Supercooling Prevention of Phase Change Material n-Octadecane Microcapsules with Peppermint Fragrance Scent

Cited by 56 publications

References 23 publications

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

Preparation of regenerated silk fibroin‐based heat‐management sponge for wound healing

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

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