Muscle-Inspired Highly Anisotropic, Strong, Ion-Conductive Hydrogels

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Biological tissues possess remarkable anisotropic mechanical properties due to their intricate microstructures.
• Muscle tissue's aligned structure inspired the development of advanced biomaterials.

Purpose of the Study:

• To create a highly anisotropic, strong, and conductive wood hydrogel.
• To utilize the inherent properties of natural wood and hydrogels for enhanced material performance.

Main Methods:

• Incorporating aligned cellulose nanofibers (CNFs) from wood with polyacrylamide (PAM) polymer.
• Developing strong bonding and cross-linking between CNFs and PAM.

Main Results:

• Achieved a wood hydrogel with high tensile strength (36 MPa) along the longitudinal direction.
• Demonstrated superior strength compared to bacterial cellulose hydrogels and unmodified PAM hydrogels.
• Exhibited excellent nanofluidic conduit properties with high ionic conductivity (up to 5 × 10^-4 S cm^-1) due to negatively charged aligned CNFs.

Conclusions:

• The developed wood hydrogel is one of the strongest reported, offering a promising strategy for biomaterials.
• The material exhibits anisotropic, flexible, and ionically conductive properties suitable for nanofluidic applications.
• This approach enables the fabrication of versatile wood-based hydrogels for diverse applications.