A comparative study of cellulose nanofibrils disintegrated via multiple processing approaches.

Area of Science:

• Materials Science
• Biotechnology
• Nanotechnology

Background:

• Cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs) are advanced nanomaterials with diverse applications.
• Optimizing the production of CNFs and CNCs is crucial for their industrial viability.
• Current methods involve mechanical treatments and chemical pre-treatments, each with distinct effects on material properties.

Purpose of the Study:

• To compare the effects of refining, microfluidization, and enzymatic/TEMPO oxidation pre-treatments on CNF properties.
• To evaluate the morphological, structural, and mechanical characteristics of derived nanomaterials and their corresponding films.
• To assess the potential of these materials as green alternatives in biorefineries.

Main Methods:

• Cellulose nanofibrils were produced using refining and microfluidization techniques.
• Enzymatic or TEMPO oxidation pre-treatments were employed prior to mechanical processing.
• Morphological properties, degree of polymerization, crystallinity, and film mechanical properties were analyzed.

Main Results:

• Microfluidization led to greater nanofibril separation, enhancing film mechanical strength and transparency compared to refining.
• Enzymatic pre-treatments produced short, stiff cellulose nanocrystal-like materials with improved tensile modulus and transparency.
• Films from CNC-like materials showed lower tensile strength but superior modulus and transparency than untreated CNFs.

Conclusions:

• Intense microfluidization is effective for producing high-strength, transparent CNF films.
• Enzymatic pre-treatments can yield CNC-like materials with desirable properties for specific applications.
• These processed cellulose nanomaterials offer a sustainable alternative for integrated biorefinery approaches.