Journal
CARBOHYDRATE POLYMERS
Volume 264, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118033
Keywords
Anisotropic aerogel; Cellulose nanofibers; Thermal insulation; Absorption; Chitosan
Categories
Funding
- National Key R&D Program of China [2018YFC2000900]
- Fundamental Research Funds for the Central Universities [2232018A3-04]
- Suzhou Science and Technology Project [ZXL2018134]
Ask authors/readers for more resources
The study successfully synthesized a recoverable, anisotropic cellulose nanofiber/chitosan aerogel with excellent properties such as deformation recovery ability, ultra-low density, high temperature-invariant, and high porosity. The composite aerogel demonstrated outstanding thermal insulation properties and oil absorption capacity, making it a potential material for thermal management and oil absorption applications.
Attributed to low cost, renewable, and high availability, cellulose-based aerogels are desirable materials for various applications. However, mechanical robustness and functionalization remain huge challenges. Herein, we synthesized a recoverable, anisotropic cellulose nanofiber (CNF) / chitosan (CS) aerogel via directional freeze casting and chemical cross-link process. The chitosan was performed as strength polymers to prohibits the shrinkage and retains the structural stability of 3D cellulose nanofiber skeleton, endowing the composite aerogel with satisfactory deformation recovery ability (without loss under 60 % stress cycled 100 times). The CNF/CS composite aerogel has ultralow density (-8.4 mg/cm3), high temperature-invariant (above 300 ?C) and high porosity (98 %). The CNF/CS aerogel demonstrates anisotropic thermal insulation properties with low thermal conductivity (28 mWm- 1 K-1 in rational direction and 36 mW m-1 K-1 in the axial direction). Moreover, the composite aerogel (water contact angle -148?) exhibited outstanding oil/water selectivity and high absorption capacity (82?253 g/g) for various oils and organic solvents. Therefore, the multifunctional CNF/CS composite aerogels are potential materials for thermal management and oil absorption applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available