Multifunctional superamphiphobic TiO2 nanostructure surfaces with facile wettability and adhesion engineering

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Conventional methods for altering surface properties are often complex and time-consuming.
• Achieving switchable wettability and adhesion on superamphiphobic surfaces presents significant challenges.
• Titanium dioxide (TiO2) nanostructured films offer unique properties for surface engineering.

Purpose of the Study:

• To develop a facile bottom-up method for rapid, in-situ control of wettability and adhesion on superamphiphobic surfaces.
• To demonstrate the versatility of the ink-combination method across various superamphiphobic substrates.
• To explore the potential applications of site-selectively engineered surfaces.

Main Methods:

• Utilizing a bottom-up ink-combination approach for surface modification.
• Employing oil-based inks to alter topographical morphology and surface chemical composition.
• Leveraging the photocatalytic property of TiO2 with anti-UV light ink masks for micro-patterning.

Main Results:

• Achieved site-selective switchable wettability from superamphiphobicity to amphiphilicity.
• Demonstrated controllable water adhesion, transitioning between sliding and sticky superamphiphobicity at the micro-scale.
• Successfully created positive and negative micro-patterns on TiO2 films.
• Showcased applications including microdroplet manipulation, gas sensing, and site-selective cell immobilization.

Conclusions:

• The developed ink-combination method offers a rapid and effective route for engineering advanced functional material surfaces with tunable wettability and adhesion.
• The technique provides a versatile platform for creating micro-patterns and enabling site-specific functionalities.
• This work contributes significantly to the field of advanced materials with special wettability properties.