Touch initiated on-demand adhesion on rough surfaces.

Area of Science:

• Materials Science
• Biomimetics
• Adhesion Science

Background:

• Achieving robust, switchable adhesion on rough surfaces with artificial materials is challenging.
• Animal locomotion often relies on reversible adhesion mechanisms.
• Existing artificial adhesives struggle with adaptability to varied surface topographies.

Purpose of the Study:

• To develop a novel adhesive inspired by snail mucus with on-demand attachment and detachment capabilities.
• To investigate a new design strategy for creating smart, responsive adhesive materials.
• To demonstrate robust adhesion on diverse surfaces using a touch-initiated mechanism.

Main Methods:

• Fabrication of a polymeric hydrogel (TIA) via photo-curing with supersaturated sodium acetate.
• Characterization of TIA's mechanical properties and adhesion strength at room temperature and elevated temperatures.
• Evaluation of TIA's reversible adhesion performance on various surfaces.

Main Results:

• TIA exhibits a significant increase in elastic modulus upon contact initiation due to crystallization.
• Adhesion strength up to 465.56 ± 84.05 kPa was achieved on various surfaces.
• Detachment was achieved by heating above 58 °C, with a significantly reduced adhesion strength of 12.71 ± 2.73 kPa.
• The material demonstrated reusability after detachment and cooling.

Conclusions:

• The snail mucus-inspired TIA provides a robust and switchable adhesive solution for on-demand attachment.
• The touch-initiated crystallization mechanism offers a novel approach for enhancing adhesion strength.
• This study presents a promising smart material and a new design paradigm for advanced adhesives.