Facile synthesis of shape-stable phase-change composites via the adsorption of stearic acid onto cellulose microfibers

Phase change materials (PCMs) offer an exciting way to facilitate energy generation from renewables and develop responsive energy management by storing and releasing thermal energy as latent heat of reversible phase transitions. Organic PCMs are attractive due to their high latent heat storage capac...

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Bibliographic Details
Published in:Materials chemistry frontiers 2022-04, Vol.6 (8), p.1033-1045
Main Authors: Voronin, Denis V., Mendgaziev, Rais I., Rubtsova, Maria I., Cherednichenko, Kirill A., Demina, Polina A., Abramova, Anna M., Shchukin, Dmitry G., Vinokurov, Vladimir
Format: Article
Language:English
Subjects:
Acids
Adsorption
Cellulose
Cellulose fibers
Composite materials
Energy management
Fourier transforms
Freezing
Heat storage
Latent heat
Leakage
Liquid phases
Melting points
Microfibers
Mortars (material)
Phase change materials
Phase transitions
Stearic acid
Storage capacity
Surface chemistry
Thermal energy
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Summary:Phase change materials (PCMs) offer an exciting way to facilitate energy generation from renewables and develop responsive energy management by storing and releasing thermal energy as latent heat of reversible phase transitions. Organic PCMs are attractive due to their high latent heat storage capacity and reliability. However, they lack shape stability. Here, we propose a simple approach to prepare shape-stable phase-change composite fibers by adsorption of stearic acid onto the surface of cellulose microfibrils. Electron and confocal microscopy demonstrated that the resultant composites were solely cellulose ribbons 10–15 μm across uniformly covered with a stearic acid layer. Fourier-transform infrared spectroscopy confirmed that stearic acid couples with cellulose by physical adsorption without any surface modification of cellulose fibers. Differential scanning calorimetry showed that the composites have an adjustable latent heat storage capacity of 108–125 J g −1 depending on the mass content of stearic acid (60–70 wt%), which was stable during 20 melting/freezing cycles. The leakage test demonstrated that the confinement of stearic acid onto the cellulose microfibrils prevents its leakage during the solid–liquid phase transition at temperatures comparable to the melting point of stearic acid. Finally, the composite fibers were tested as a thermoregulating additive to a commercially available cement mortar mix.
ISSN:2052-1537
2052-1537
DOI:10.1039/D1QM01631H