Dynamically Evolving Surface Patterns through Light-Triggered Wrinkling Erasure.

Area of Science:

• Polymer Science
• Materials Science
• Surface Chemistry

Background:

• Controlling polymer surface topography with remote signals is crucial for advanced applications.
• Periodic surface patterns, such as wrinkles, are particularly important for tunable functionalities.
• Existing methods often lack precise remote control or efficiency in pattern generation.

Purpose of the Study:

• To report a novel light-induced cascade for dynamic changes in polymer surface wrinkling wavelengths.
• To investigate the influence of supramolecular design on the light-triggered topographic transformations.
• To demonstrate an efficient conversion of molecular-level photoisomerization to macroscopic pattern changes.

Main Methods:

• Utilizing thin polymer layers on elastomeric substrates under tensile stress.
• Employing supramolecular design to vary the ratio of light-active and light-passive components.
• Applying light as a remote signal to induce a cascade of wrinkling pattern changes.

Main Results:

• Demonstrated light-induced cascade of changes in wrinkling wavelengths on polymer surfaces.
• Showcased tunability of cascade type and rate by component ratio and light intensity.
• Achieved efficient conversion of sub-nanometer photoisomerization to 10 μm scale pattern changes with minimal chromophore incorporation.

Conclusions:

• The developed method offers precise, on-demand control over polymer surface topography using light.
• Supramolecular design provides a powerful tool to tune the dynamic light-induced surface pattern evolution.
• This efficient process enables the translation of molecular photoresponsive events into significant macroscopic surface pattern modifications.