Natural Resin Nanofilms through Flexible Coordination for Molecular Separation

Area of Science:

• Materials Science
• Biotechnology
• Chemical Engineering

Background:

• Forestry biomass offers sustainable resources for thin-film technologies.
• The inherent brittleness of biomass materials limits their application in thin-film processing.
• Developing flexible and robust biomass-derived thin films is crucial for sustainable material innovation.

Purpose of the Study:

• To overcome the brittleness of forestry biomass for thin-film applications.
• To develop mechanically robust and flexible nanofilms from rosin.
• To explore the potential of these nanofilms in nanofiltration.

Main Methods:

• Chemical modification of rosin to create carboxylic derivatives.
• Solubilization of derivatives in turpentine, a natural solvent.
• Interfacial coordination with aqueous metal ions to assemble nanofilms.
• Characterization of mechanical properties (stiffness, elasticity) and nanofiltration performance.

Main Results:

• Successfully transformed brittle rosin into mechanically robust nanofilms with flexible linkages.
• Achieved tunable stiffness (Young's modulus >120 GPa) and high elasticity through metal-rosin coordination.
• Demonstrated durable and efficient molecular sieving in nanofiltration membranes with high pressure resistance (up to 20 bar) and permselectivity.

Conclusions:

• Metal-rosin coordination provides a method to create flexible, robust nanofilms from brittle biomass.
• These novel nanofilms show significant potential for advanced nanofiltration and other thin-film applications.
• This approach may revolutionize biomass-based thin films by addressing brittleness through flexibility.