Hierarchically Organized Biomimetic Architectured Silk Fibroin–Ceramic-Based Anisotropic Hybrid Aerogels for Thermal Energy Management

材料科学 丝素 陶瓷 复合材料 各向异性 热的 高分子科学 丝绸 纳米技术 量子力学 物理 气象学
作者
Hajar Maleki,Thomas Fischer,Christoph Bohr,Jaqueline Auer,Sanjay Mathur,Barbara Milow
出处
期刊:Biomacromolecules [American Chemical Society]
卷期号:22 (4): 1739-1751 被引量:23
标识
DOI:10.1021/acs.biomac.1c00175
摘要

Due to the current energy crises, the search for thermal energy management systems based on thermal insulating porous materials has drawn a significant deal of attention. Herein, we demonstrated the thermal insulation and management capabilities of cuttlefish bone mimetic aerogels with hierarchically organized porous structures directly fabricated from surface-modified and self-assembled silk fibroin (SF) biopolymer extracted from Bombyx mori silkworm cocoon biomass; hereafter, the materials developed referred to as X-AeroSF. Exploiting from creating an interpenetrating network of the secondary ceramic components of various one-, two-, and three-dimensional sepiolite (Mg2H2Si3O9·xH2O), MXene (Ti3C2TX), and silica nanostructures inside the self-assembled SF biopolymer and subsequent uni-directional freeze-casting and drying the resulted hydrogels, composites with aerogel features were obtained. The obtained aerogels possess low bulk density (ρb = 0.059-0.090 g cm-3), low thermal conductivities (λ = 0.035-0.042 W m-1 K-1), and high thermal stability (up to ∼260 °C) with multi-modal lamella-bridge porous microstructures found in the cuttlefish bone structure. In addition, the intriguing anisotropy in the X-AeroSF composite porous structure enables thermal dissipation along with the aligned pore directions, thus decreasing the local overheating on the heated side. As a result, an improvement in thermal insulation in the perpendicular direction with respect to the pore lamellae was obtained. Therefore, the exquisite thermal energy management, biodegradability, low bulk density, fire resistivity, together with possible manufacture scalability of X-AeroSF composite, make this material attractive for future practical applications.
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