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Solvent-Induced Triradial Pattern Formation on Solid-Supported Viscoelastic Thin Films and Gels.
Fan Zhao1, Surjyasish Mitra2, Minmin Xu3
1Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
ACS Applied Materials & Interfaces
|November 4, 2025
Summary
Researchers discovered how solvent-driven processes create unique triradial patterns on soft silicone surfaces. This understanding allows for the design of dynamic surface architectures through controlled solvent processing.
Area of Science:
- Materials Science
- Soft Matter Physics
- Surface Chemistry
Background:
- Solvent-driven surface instabilities in soft materials can create spontaneous patterns.
- The mechanisms behind pattern emergence, evolution, and modulation are not fully understood.
Purpose of the Study:
- To investigate the time-dependent formation of quasi-periodic triradial patterns on silicone films during solvent extraction.
- To elucidate the underlying mechanisms driving pattern development and explore tunability.
Main Methods:
- Utilized dual-wavelength reflection interference contrast microscopy to observe morphological changes.
- Conducted systematic studies on silicone elastomers and gels with varying properties.
Main Results:
- Observed a progression from circular domains to well-defined triradial patterns over time.
- Identified internal stress, modulus gradients, and network densification as key drivers.
- Demonstrated that pattern geometry is tunable via cross-link density and solvent retention.
Conclusions:
- Established a general mechanism for solvent-mediated pattern formation in soft silicone films.
- Showcased potential for designing dynamic and programmable surface architectures through controlled solvent processing.
