LAPONITE® based hydrogel for cold thermal energy storage application

Purohit, Bijoy Kumar; Sistla, V. S.

doi:10.1007/s12034-021-02416-3

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…Typically, Lin et al reported a colossal and reversible barocaloric effect in n-alkanes with SL-PTs, and the entropy change reached up to ~700 J•kg −1 •K −1 at a low pressure of ~50 MPa due to the twisting and random thermal motions of the molecular chains 18 . However, SL-PT materials are prone to problems, such as liquid leakage from the containers, phase separation caused by the overall convective flow during the phase transition, and supercooling during solidification, which inevitably cause the corrosion damage of refrigeration devices and the irreversible performance of refrigerants 19,20 . Therefore, it is of great significance to explore the curing of the liquid phase while maintaining huge disorder and high entropy.…”

Section: Introductionmentioning

confidence: 99%

Colossal barocaloric effect achieved by exploiting the amorphous high entropy of solidified polyethylene glycol

Zhou

et al. 2022

NPG Asia Mater

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The barocaloric effect (BCE) has emerged as an intense research topic in regard to efficient and clean solid-state refrigeration. Materials with solid-liquid phase transitions (SL-PTs) usually show huge melting entropies but cannot work in full solid-state refrigeration. Here, we report a colossal barocaloric effect realized by exploiting high entropy inherited from huge disorder of liquid phase in amorphous polyethylene glycol (PEG), which is solidified by introducing 5 wt.% polyethylene terephthalate (PET). Transmission electron microscopy (TEM) combined with X-ray diffraction (XRD) demonstrates the amorphous nature of the high-temperature phase after fixation by PET. Although PEG loses its –OH end mobility in amorphous solid, high entropy still retains owing to the retained high degrees of freedom of its molecular chains. The remaining entropy of amorphous PEG is up to 83% of that of liquid PEG in PEG10000/PET15000, and the barocaloric entropy change reaches ΔSp ∼ 416 J·kg−1·K−1 under a low pressure of 0.1 GPa, which exceeds the performance of most other BCE materials. Infrared spectra combined with density function theory (DFT) calculations disclose conformational change from the liquid to amorphous state, which explains the origin of the large entropy retained and hence the colossal BCE of the solidified PEG. This research opens a new avenue for exploring full solid-state barocaloric materials by utilizing genetic high entropy from huge disordering of liquid phases in various materials with SL-PTs.

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Section: Introductionmentioning

confidence: 99%

Colossal barocaloric effect achieved by exploiting the amorphous high entropy of solidified polyethylene glycol

Zhou

et al. 2022

NPG Asia Mater

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show abstract

“…17,18 However, SL-PT materials are prone to such problems as liquid leakage from the containers, phase separation caused by the overall convective ow during the phase transition, and supercooling during solidifying, which inevitably cause corrosion damage of refrigeration devices and the irreversible performance of refrigerants. 19,20 Therefore, it is of great signi cance to explore the curing of liquid phase while maintaining huge disorder and high entropy.…”

Section: Introductionmentioning

confidence: 99%

Colossal barocaloric effect exploiting amorphous high entropy in solidified polyethylene glycol

Zhou

et al. 2022

Preprint

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Barocaloric effect (BCE) has emerged as one of intense topics aiming at solid-state refrigeration featuring efficiency and cleanness. Materials with solid-liquid phase transition (SL-PT) usually show huge melting entropy but cannot work in full solid-state refrigeration. Here we report colossal barocaloric effect realized by exploiting high entropy inherited from huge disorder of liquid phase in amorphous polyethylene glycol (PEG), which is solidified through introducing 5wt.% polyethylene terephthalate (PET). TEM combined XRD demonstrate the amorphous nature of high-temperature phase after fixed by PET. Although the PEG loses the -OH end mobility in amorphous solid, high entropy still retains owing to retained high freedom of molecule chains. The remained entropy in amorphous PEG is up to 83% of liquid PEG in PEG10000/PET15000, and the barocaloric entropy change reaches ΔSp ∼ 416 J·kg− 1·K− 1 under a low pressure 0.1 GPa, which exceeds the performance of most other BCE materials. Infrared spectra combined with density function theory (DFT) calculations disclose conformational change from liquid to amorphous state, which explains the origin of huge entropy retained and hence colossal BCE in the solidified PEG. This research opens a new avenue for exploring full solid-state barocaloric materials by utilizing genetic high entropy from huge disordering of liquid phase in various materials with SL-PT.

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Aloe vera hydrogel for supercooling applications: a review

Dada,

Popoola

2024

Discov Mater

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Aloe vera, a medicinal herb, is used in health care and cosmetics due to its biological activity. Its gel contains acemannan, which has high water content, biocompatibility, biodegradability, and customizable properties. Acemannan hydrogels can absorb and retain up to 99% of their weight, enabling supercooling and longer periods. There are literature reports on cellulose-based, chitosan-based, alginate-based, and starch-based hydrogels, but very limited studies on acemannan-based hydrogels, especially for supercooling applications. Hence, understanding AvP’s supercooling properties is crucial for developing reliable supercooling devices. The potential of hydrogels based on AvP for supercooling applications is examined in this review. The study reports on the idea of supercooling, how important it is in different fields, and how current techniques are limited. The review focuses on the characteristics, composition, and hydrogel formation process of AvP. It goes over AvP hydrogels’ capacity for supercooling, and the difficulties and potential paths for enhancing these hydrogels’ functionality and performance are also covered.

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LAPONITE® based hydrogel for cold thermal energy storage application

Cited by 6 publications

References 22 publications

Colossal barocaloric effect achieved by exploiting the amorphous high entropy of solidified polyethylene glycol

Colossal barocaloric effect achieved by exploiting the amorphous high entropy of solidified polyethylene glycol

Colossal barocaloric effect exploiting amorphous high entropy in solidified polyethylene glycol

Aloe vera hydrogel for supercooling applications: a review

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