A recent study focused on developing hydrophobic paper by leveraging the mechanical properties and water resistance of cellulose nanofibers, aiming to create a sustainable, high-performance material suitable for packaging and biomedical devices.

Source: PHYS

This research utilized a supramolecular approach, which involves combining short chains of proteins (peptide sequences) without chemically altering the cellulose nanofibers. This innovative hydrophobic paper could potentially replace petroleum-based products in the future.

Our supramolecular approach involved adding small sequences of peptides, which bind onto the nanofibers and so improve their mechanical performance and water-resistance. The results of the study showed that even minimal quantities of peptides (less than 0.1%) can significantly increase the mechanical properties of the hybrid materials produced, giving them greater resistance to stress.

The study, titled "Nanocellulose-short peptide self-assembly for improved mechanical strength and barrier performance," was highlighted on the cover of the Journal of Materials Chemistry B. It was conducted by researchers from the "Giulio Natta" Department of Chemistry, Materials and Chemical Engineering at the Politecnico di Milano, in collaboration with Aalto University, the VTT Technical Research Centre in Finland, and the SCITEC Institute of the CNR.

Cellulose nanofibers (CNFs) are natural fibers derived from cellulose, a renewable and biodegradable resource, recognized for their strength and adaptability. In this study, researchers from the SupraBioNanoLab within the "Giulio Natta" Department demonstrated how to significantly enhance the properties of cellulose nanofibers without chemical modifications by incorporating small proteins called peptides.

This advance opens up new opportunities for creating biomaterials that can compete with petroleum-derived materials in terms of performance, achieving the same quality and efficiency while reducing environmental impact. These hybrid materials are very suitable for sustainable packaging, where resistance to moisture is vital, and also for use in biomedical devices, thanks to their biocompatibility.

Lastly, the team evaluated the effects of adding fluorine atoms to the peptide sequences, which allowed them to form a structured hydrophobic film on the material. This enhancement provided improved water resistance while maintaining its biocompatible and sustainable qualities.