期刊
CHEMICAL ENGINEERING JOURNAL
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124449
关键词
Cellulose nanofibers; Biomimetic-structural aerogels; Graphene-confined zirconium phosphate; Thermal insulation; Flame retardance; Mechanical properties
资金
- Natural Science Foundation of Jiangsu Province [BK20190613]
- Fundamental Research Funds for the Central Universities [JUSRP11802]
- National Natural Science Foundation of China [51703208]
- National Key R&D Program of China [2018YFC1902105]
- Basic Research Program of Jiangnan University [JUSRP21933]
- Australian Research Council [DE190101176]
- Australian Research Council [DE190101176] Funding Source: Australian Research Council
With the rapid increase of energy consumption, thermal-insulating materials made from abundant renewable resources are in urgent need for energy-efficient buildings, which satisfies the sustainable development of society. Cellulose nanofiber aerogels exhibit a promising prospect in thermal-insulating application, whereas still confront the inherent weakness of high flammability as well as the improvement of mechanical stiffness and thermal insulation. In the present study, inserting the growth of two-dimensional zirconium phosphate within multilayer graphene results in the formation of hierarchical graphene-confined zirconium phosphate (ZrP/RGO) nanosheets through a spatial confinement strategy. Inspired by the porous lamella-bridge architecture of Thalia dealbata stem, a unidirectional freeze-casing technique is utilized to assemble the building blocks of cellulose nanofiber and ZrP/RGO nanosheet into a biomimetic-structural aerogel which has excellent thermal-insulating, mechanical and flame-retardant properties. Compared with state-of-the-art cellulose nanofiber-based aerogels, the resulting composite aerogel perpendicular to lamellar alignments shows an ultralow thermal conductivity (18 mW.m(-1).K-1), the maximal specific Young's modulus (104 kN.m.kg(-1)) and high limited oxygen index (33.5) as well as very low peak heat release rate (14.1 kW/m(2)). Nature provides renewable resources and structural inspirations to achieve high-performance thermal insulation materials through nanoscale engineering.
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