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Multifunctional Integration of Latent-Heat Buffering; Nanoporous Insulation; and Metal–Organic Framework-Mediated Flame Retardancy in Cellulose Aerogels for High-Performance Thermal Management and Fire Safety
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DOI：10.1021/acsami.6c04323.png)
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Abstract
En 中文
The integration of thermal insulation, transient thermal buffering, and fire safety in lightweight sustainable materials is highly desirable but remains challenging. Herein, a multifunctional phase-change cellulose aerogel (PCMA) was developed by incorporating a flame-retardant PWUiO-66 phase into a cellulose nanofiber framework via hydrothermal-assisted freeze-drying. The resulting aerogel exhibits a hierarchically porous structure with confined functional domains, enabling simultaneous suppression of heat transfer and enhanced fire resistance. Relative to pristine CNF, PCMA exhibits reduced thermal conductivity (0.710 m–1·K–1 and 0.164 m–1·K–1) and thermal diffusivity (0.700 (mm)2/s, 0.700 (mm)2/s), together with improved resistance to transient thermal shock. The confined phase-change domains provide heat-buffering capability by absorbing thermal energy during heating, while cone calorimetry reveals a substantial reduction in peak heat release rate from 69.4 to 30.8 kW·m–2. Structural characterization shows that the incorporation of PWUiO-66 transforms the smooth fibrillar CNF network into a roughened and interconnected porous architecture, which improves thermal insulation and promotes the formation of a stable char barrier during combustion. These results indicate that the multifunctional performance of PCMA arises from the synergistic combination of hierarchical porous insulation, phase-change-assisted thermal buffering, and MOF-mediated flame-retardant stabilization. This work offers an effective strategy for designing cellulose-based aerogels for advanced thermal protection and fire-safe insulation applications.
Keywords:
flame-retardant cellulose aerogel
phase-change material
metal organic framework (MOF)
thermal insulation fire safety
thermal shock resistance
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