Spatial forcing of microwrinkle patterns

PMSE 150

Takuya Ohzono, Nanotechnology Research Institute (Kansai), National Institute of Advanced Industrial Science and Technology (AIST), 1--8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan
Microwrinkles on a surface-modified elastomer spontaneously appear under lateral compression, and exhibit a rich variety of stripe patterns. The property of the stripe orientations is strongly influenced by the in-plain strain state. Especially, the orientationally-aligned wrinkles by uniaxial strain may serve many uses. However, it seems difficult to obtain microwrinkles with the perfect alignment if we only rely on the self-organization process. Here, we show that a simple method to control the wrinkle orientation precisely by introducing small lithographic structures on the original surface as spatial triggers for directed wrinkle formation. Interestingly, the spatial wavelength was resonantly forced/modulated by the imposed periodic nanostructures. The orientation of the wrinkles was also forced to the artificial triggers.