Robust All-Cellulose Nanofiber Composite from Stack-Up Bacterial Cellulose Hydrogels via Self-Aggregation Forces.

Area of Science:

• Materials Science
• Biomaterials Engineering

Background:

• Traditional all-cellulose composites often involve harsh chemical treatments, compromising their environmental friendliness.
• Bacterial cellulose (BC) offers a sustainable alternative due to its high purity and inherent nanofibrous structure.

Purpose of the Study:

• To develop an environmentally friendly fabrication method for all-cellulose nanofiber composites.
• To investigate the structural and mechanical properties of composites derived from bacterial cellulose hydrogels.

Main Methods:

• Utilized a water-based processing technique for stacking bacterial cellulose (BC) hydrogels.
• Leveraged the self-aggregation forces of hydrogen bonds for composite formation.
• Characterized the structural and mechanical performance of the resulting BC-laminated composites.

Main Results:

• The fabricated BC composites exhibit an all-nanofiber structure.
• Achieved a tensile strength of 116 MPa and a storage modulus of 25 GPa.
• Demonstrated strong interfacial adhesion through interfacial shear strength and tensile strength measurements, confirming robust hydrogen bonding.

Conclusions:

• The water-based self-aggregation method provides an eco-friendly route to high-performance all-cellulose composites.
• The strong mechanical properties and inherent structure make BC-laminated composites highly attractive for structural material applications.