Layer-by-Layer Assembled Microgels Can Combine Conflicting Properties: Switchable Stiffness and Wettability without...

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Responsive interfacial architectures often require conflicting material properties like stiffness and wettability.
• These properties are typically interdependent, posing challenges for applications such as tissue engineering.

Purpose of the Study:

• To decouple conflicting material properties (stiffness, wettability, permeability) in interfacial architectures.
• To develop tailorable scaffolds with tunable functionalities for advanced applications.

Main Methods:

• Utilized a nanoarchitectonic approach with thermoresponsive microgels as building blocks.
• Constructed three-dimensional arrays of interconnected pores using layer-by-layer assembly of poly(N-isopropylacrylamide-co-methacrylic acid) microgel films.

Main Results:

• Microgel films exhibited increased hydrophobicity, stiffness, and adhesion upon temperature increase above the lower critical solution temperature.
• Crucially, the permeability of redox probes through the films remained unchanged, indicating preserved porosity.

Conclusions:

• The developed approach successfully decouples stiffness and wettability from permeability by maintaining film porosity.
• This strategy offers a novel route for designing advanced scaffolds with independent control over multiple material properties.