Straightforward functionalization of breath figures: Simultaneous orthogonal host-guest and pH-responsive interfaces

Area of Science:

• Materials Science
• Surface Chemistry
• Polymer Science

Background:

• Developing smart materials with tunable surface properties is crucial for advanced applications.
• Controlling surface charge and functionality reversibly remains a significant challenge in materials science.

Purpose of the Study:

• To design and prepare multireversible smart porous surfaces.
• To achieve tunable surface charge states (neutral, negative, positive) through host-guest and electrostatic interactions.
• To demonstrate the reversibility of these surface functionalization steps.

Main Methods:

• Synthesis of a copolymer containing cyclodextrin (CD) moieties via click chemistry.
• Fabrication of porous surfaces using the breath figures technique with copolymer blends.
• Reversible functionalization using adamantane-terminated poly(acrylic acid) (Ada-PAA85) and poly-L-lysine (PLL).

Main Results:

• Successfully created porous surfaces with controlled pore sizes and chemical distribution.
• Demonstrated reversible switching between neutral, negatively charged, and positively charged surface states.
• Confirmed the complete reversibility of both host-guest and electrostatic interactions, allowing recovery of the initial surface.

Conclusions:

• The developed smart porous surfaces exhibit multireversible and tunable charge characteristics.
• The combination of host-guest and electrostatic interactions provides a robust platform for dynamic surface modification.
• These findings open avenues for novel applications in areas requiring switchable surface functionalities.