The collection, storage, and use of energy and information are important issues for overcoming the global energy shortage while satisfying the demand for information transmission. This research reports a nano-Fe 3 O 4 and erythritol (ER)-functionalized, cross-linked methyl cellulose aerogel (MC−EP) composite that has the characteristics of phase-change energy storage as the magnetic and ultraviolet responses requisite for light-to-heat conversion and storage. The nano-Fe 3 O 4 particles in MC−EP− ER-75 were fixed and filled into pore structures in MC−EP. ER was used to form an effective combination with MC−EP. The addition of nano-Fe 3 O 4 compensated for the low thermal conductivity of ER. The MC−EP−ER-75 was able to store solar radiationinduced energy due to the loading of ER at a photothermal conversion efficiency of 79.67% and a light-to-heat conversion efficiency of 79.67%. The results of thermal stability (TGA) analysis showed that MC−EP−ER-75 was thermally degraded acceptably below 200 °C. The differential scanning calorimetry curve and latent heat values (melting/crystallization enthalpies of 314.8 and 197.9 J/g, respectively) of MC−EP−ER-75 did not change after 100 cycles. In addition, it exhibited excellent saturation magnetization, superparamagnetism, and ultraviolet shielding, as well as a rapid response to the ultraviolet and magnetic fields. This provided a way to prepare light-to-heat conversion−storage−release materials and ultraviolet−magnetic sensors that can be used in renewable resources.
Shaped-stabilized reversible thermochromic phase change materials of (TBC-LB, TBB-LB) were assembled by impregnation the TBC (crystal violet lactone/ bisphenol A/tetradecanol) or TBB (3,3 0 -Bis (1-n-octyl-2-methylindol-3-yl) phthalide/bisphenol A/tetradecanol) into lignin-retained bamboo (LB) for energy storage. Analysis of the chemical structure of lignin-retained wood showed that the removal of part of lignin from the bamboo contributes to the penetration of the compound, and the partial retention of lignin is advantageous for maintaining high mechanical properties. The SEM micrographs of TBC-LB and TBB-LB indicate that TBC and TBB are well immersed into the porous LB. The TBC-LB showed an endothermic peak at 40.8 C with ΔH m of 113.3 J g −1 and two exothermic peaks at 28.8 C and 21.9 C with ΔH L+S of 110.2 J g −1 , and the value is basically equal to the pure TBC compound, indicating that TBC has been fully immersed in LB to form a composite phase change material. For phase change latent heat and melting-cooling temperature, TBB-LB and TBC-LB showed the same trend. About 100 heating-cooling cycles were performed to evaluate the reliability of TBC-LB and TBB-LB, showing excellent cycle stability. It is foreseen that the prepared shape-stable TBC-LB and TBB-LB have great potential for applying insulation systems in reversible thermochromic phase change energy storage. K E Y W O R D S composite, lignin-retained bamboo, phase change, properties, reversible thermochromic compound
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