Nanopatterned protein-polysaccharide thin films by humidity regulated phase separation

Area of Science:

• Materials Science
• Biotechnology
• Sustainable Manufacturing

Background:

• Mass manufacturing relies on petrochemicals, raising sustainability and cost concerns.
• Micro- and nano-patterned films are crucial in materials science but face supply limitations.
• Developing sustainable alternatives is essential for alleviating climate change.

Purpose of the Study:

• To describe the production of patterned biopolymer films using controlled phase separation.
• To achieve nanopatterns with morphologies similar to synthetic block-copolymers (BCPs).
• To explore easily transferable variables and methods for film patterning.

Main Methods:

• Utilized controlled phase separation of biopolymeric thin films.
• Investigated protein and polysaccharide type, ratio, casting method, and ambient humidity.
• Achieved feature sizes ranging from 160 nm to over 5 μm.

Main Results:

• Generated diverse morphologies including bicontinuous, porous, droplet-matrix, particulated, and dimpled.
• Demonstrated that protein-to-polysaccharide ratio influences pore morphology (high protein: porous; high polysaccharide: spherical).
• Showed humidity control impacts feature size (high humidity: large protuberances; low humidity: small discrete features).

Conclusions:

• Biopolymer films can be patterned into various morphologies using controlled phase separation.
• Tunable nanopatterns can be achieved by adjusting biopolymer composition and environmental conditions.
• This method offers a sustainable, adaptable approach for creating advanced material surfaces.