Top-Down Approach Making Anisotropic Cellulose Aerogels as Universal Substrates for Multifunctionalization

Area of Science:

• Materials Science
• Nanotechnology
• Sustainable Chemistry

Background:

• Aerogels are versatile materials with applications in insulation, filtration, and energy storage.
• Current aerogels often rely on fossil resources and require complex methods to achieve anisotropy.
• Wood's natural hierarchical structure offers potential for creating advanced anisotropic aerogels.

Purpose of the Study:

• To develop a universal and sustainable approach for preparing porous, strong, and anisotropic aerogels.
• To leverage the inherent structure of wood for aerogel fabrication.
• To demonstrate the multifunctionality of the resulting wood-based aerogels.

Main Methods:

• Utilizing the natural hierarchical and anisotropic structure of wood.
• Nanoscale removal of lignin followed by dissolution-regeneration of nanofibers.
• In situ synthesis of nanoparticles (Ag, TiO2), coating with conductive polymers (PEDOT:PSS), and carbonization.

Main Results:

• Preparation of highly porous (95% porosity) and strong anisotropic aerogels from wood.
• Achieved specific surface areas up to 247 m²/g, a record for wood aerogels.
• Demonstrated successful decoration with metal/metal oxide nanoparticles and creation of conductive aerogels.

Conclusions:

• The presented method offers a universal pathway to highly porous, anisotropic aerogels derived from a sustainable resource.
• The wood-derived aerogels exhibit excellent mechanical properties and high surface area, outperforming many existing cellulose-based aerogels.
• These aerogels serve as a versatile platform for multifunctional composites in catalysis, separation, and electronics.