Exceptional cold-crystallization kinetics of erythritol-polyelectrolyte enables long-term thermal energy storage

Turunen, Konsta; Yazdani, Maryam Roza; Santasalo-Aarnio, Annukka; Seppälä, Ari

doi:10.1016/j.solmat.2021.111273

Cited by 20 publications

(25 citation statements)

References 43 publications

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“…STA tests confirmed that the operational range of NaPP extends up to 150 °C. This corresponds to the mixtures of erythritol and polyelectrolytes, which begin to degrade approximately at 150 °C, , corroborating the results.…”

Section: Resultssupporting

confidence: 85%

“…A similar crystallization behavior was observed with erythritol in cross-linked sodium polyacrylate. 23 The spherical crystal growth enables modeling and prediction of the cold crystallization process, which can be useful for applications. On the other hand, the 75-10-15 sample showed an irregular crystal shape with pointy edges, as depicted in Figure 7D−E.…”

Section: Optimizationmentioning

confidence: 99%

“…We have previously demonstrated that combinations of erythritol and polyelectrolytes exhibit improved stability in the supercooled state and sufficient crystallization rate for practical applications. − Such systems operate uniquely by stably supercooling close to the glass-transition region, where molecular movement is reduced to the level such that the latent heat of melting can be stored for several months even if spontaneous crystallization occurs. Heat is then released in a controllable manner via cold crystallization, where re-heating the material to the cold crystallization temperature increases the molecular movement to the extent such that the material crystallizes.…”

Section: Introductionmentioning

confidence: 99%

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Ionic Mixture of Binary Sugar Alcohols and a Polymer: Composition Optimization for Long-Term Thermal Energy Storage

Turunen

Yazdani

2022

ACS Sustainable Chem. Eng.

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A new cold crystallizing material (NaPP) is analyzed for longterm thermal energy storage (TES). NaPP comprises a mixture of erythritol and mannitol as the binary phase change material (PCM) in the scaffold of polyvinyl alcohol (PVA) cross-linked with sodium citrate (SC). The material demonstrates a unique behavior of stable supercooling and vitrification during cooling and cold crystallization during subsequent heating, which enables a reliable long-term storage of the melting enthalpy and a controllable heat release. The use of several components in the material composition, however, impedes optimization of the thermal properties for the storage. As such, differential scanning calorimetry (DSC) was applied to expose the effect of the material components on the thermal properties, and the mixture experimental methodology (MEM) was used to model and optimize these properties. Successful modeling yielded a linear response for the thermal performance, which was significantly affected by the content of SC. Increasing the amount of SC (from 0 to 18 wt %) elevated the ionic strength of the system, which caused reduction in the amount of active PCM (confirmed by X-ray diffraction and DSC) and coarsening of the surface morphology (revealed by optical and scanning electron microscopies). This was also manifested as gradual disappearance of cold crystallization which limits the use of the material to compositions with the glass-transition temperature below −15 °C. MEM identified the optimal composition as 88.9 wt % PCM and 11.1 wt % SC, which showed a melting enthalpy of 194 J/g at 105 °C. Yet, the composition comprising 80 wt % PCM, 10 wt % PVA, and 10 wt % SC showed both high melting enthalpy (176 J/g) and shape stability facilitating larger scale applications. These compositions demonstrated a temperature increase of 10−20 °C during cold crystallization of a 10 g sample, confirming the suitability of the optimization model and the operation of the new material for long-term TES.

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Section: Resultssupporting

confidence: 85%

Section: Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ionic Mixture of Binary Sugar Alcohols and a Polymer: Composition Optimization for Long-Term Thermal Energy Storage

Turunen

Yazdani

2022

ACS Sustainable Chem. Eng.

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“…The good long-term performance and the stability of the supercooled state in cold crystallization behavior are very important to the development of new materials. 44–46 Therefore, the long-term stability of the glassy state in this study suggests that OC6-salmpn is a good heat-storage material.…”

Section: Resultsmentioning

confidence: 63%

Effects of alkyl chain length on the cold crystallization of Schiff-base nickel(ii) complexes

2022

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“…However, supercooling occurs when there are some factors that inhibit solidification, and the supercooled molecules store heat corresponding to the phase transition energy. 2 The supercooled molecules sometimes crystallize when they are reheated, and crystallization during the heating process is called cold crystallization. Macromolecules often exhibit supercooling, glass transitions, and cold crystallization.…”

Section: Introductionmentioning

confidence: 99%

Cold crystallization and photo-induced thermal behavior of alkyl-derivatized diarylethene molecules

et al. 2022

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Exceptional cold-crystallization kinetics of erythritol-polyelectrolyte enables long-term thermal energy storage

Cited by 20 publications

References 43 publications

Ionic Mixture of Binary Sugar Alcohols and a Polymer: Composition Optimization for Long-Term Thermal Energy Storage

Ionic Mixture of Binary Sugar Alcohols and a Polymer: Composition Optimization for Long-Term Thermal Energy Storage

Effects of alkyl chain length on the cold crystallization of Schiff-base nickel(ii) complexes

Cold crystallization and photo-induced thermal behavior of alkyl-derivatized diarylethene molecules

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