期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 8, 页码 6387-6391出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b01608
关键词
Aerogel; Nanocellulose; Freezing; Solvent exchange ambient drying
资金
- NSF DMR-POLYMERS [DMR 1506968]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1506968] Funding Source: National Science Foundation
Cellulose-based aerogels are reported that were generated using cellulose nanofibril (CNF) gels in an ambient drying process. These nancellulose aerogels were inspired by the preparation of a traditional Chinese food, frozen tofu, which undergoes significant toughening after freezing and thawing. It is this toughening mechanism that allows for the formation of nanocellulose aerogels which ordinarily would collapse upon ambient drying. By freezing hydrated CNF gel dispersions, solvent exchanging, and drying at ambient pressure, monolithic nanocellulose aerogels with high porosity (>98%), low density (as low as 0.018 g cm(-3)), and high surface area (>30 m(2) g(-1)) were readily generated. Moreover, since no special reactors are required, these structures can be easily created over large areas. For example, a hydrated CNF gel was frozen at -72 degrees C, and then, the frozen gel was immersed directly in a 2-propanol bath to allow solvent exchange. The resulting alcohol-infused gel was dried at ambient pressure to fabricate monolithic CNF aerogels, enabling the scalable fabrication of nanocellulose aerogels in an energy-efficient and cost-effective manner.
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