Tough, Highly Oriented, Super Thermal Insulating Regenerated All-Cellulose Sponge-Aerogel Fibers Integrating a Graded Aligned Nanostructure

• DOI: 10.1021/acs.nanolett.1c03943
• Publication Date: 2022-04-01T19:10:07Z
• Authors: Qihua Li; Zhanhong Yuan; Chi Zhang; Shuiqing Hu; Zhiming Chen; Yingzhu Wu; Pan Chen; Haisong Qi; Dongdong Ye
• Keywords: Solvents; Humans; Thermal Conductivity; 02 engineering and technology; Cellulose; 0210 nano-technology; Porosity; Nanostructures

Thermal insulating fibers can effectively regulate the human body temperature and decrease indoor energy consumption. However, designing super thermal integrating a sponge aerogel structure based on biomass resources is still challenge. Herein, flow-assisted dynamic dual-cross-linking strategy developed to realize steady fabrication of regenerated all-cellulose graded sponge–aerogel (CGFs) in microfluidic chip. The chemically cross-linked cellulose solution used as core flow, which passed through two sheath flow channels, containing either diffusion solvent or physical cross-linking solvent, resulting CGFs with porous outer layer dense inner layer. By regulating simulating process chip, adjustable thicknesses, excellent toughness (26.20 MJ m–3), ultralow conductivity (0.023 W m–1 K–1) are fabricated. This work provides new method for fabricating inspires attractive applications insulation textiles.