Sub-10 μm Soft Interlayers Integrating Patterned Multivalent Biomolecular Binding Environments

Area of Science:

• Materials Chemistry
• Surface Science
• Biomolecular Engineering

Background:

• Controlled presentation of multivalent ligand clusters is crucial for applications like biomolecular screening and artificial extracellular matrices.
• Existing methods often require complex scaffolds and are limited by substrate specificity.
• A versatile interlayer chemistry for nanometer-scale patterning and material integration is needed.

Purpose of the Study:

• To develop a novel interlayer chemistry for efficient nanometer-scale patterning and transfer to soft materials.
• To create thin films with high surface functionalization density for controlled ligand presentation.
• To establish design principles for optimizing transfer layer properties.

Main Methods:

• Assembly of nanometer-resolution chemical patterns on graphite substrates.
• Diacetylene polymerization to stabilize molecular patterns.
• Covalent transfer of patterns to low-viscosity polydimethylsiloxane (PDMS) films.
• Characterization using swelling and other methods to correlate functionalization efficiency with PDMS cross-linking.

Main Results:

• Development of a low-viscosity PDMS formulation enabling <10 μm thin films with dense cross-linking.
• Achieved up to 10-fold greater surface functionalization efficiency compared to previous soft materials.
• Demonstrated high-efficiency functionalization with polydiacetylene arrays displaying carbohydrates and other groups.
• Established design principles for thinner transfer layers based on PDMS cross-link density.

Conclusions:

• The developed interlayer approach enables highly controlled multivalent ligand display on soft materials.
• This method significantly broadens the scope of surfaces available for sensors and wearable electronics.
• The approach lays groundwork for advanced surface design in biomaterials and electronics.