| 초록 |
We describe the experimental study on the spontaneous capillary instability of gradient concentric poly(methyl methacrylate) (PMMA) rings beneath the continuous polystyrene (PS) film. Upon chemical annealing using selective solvent vapor only for PMMA, the PMMA rings were transformed into small dots beneath the continuous PS film via capillary force driven rupture. Dimensional features of the PMMA dots strongly depended upon the initial width of the PMMA microscopic rings. Repeatedly, such this concentric ring geometry triggered a competition between the phase correlation of neighboring rings and the kinetically favorable wavelength, thus leading to the formation of an intriguing, recursive surface sub-patterns. This frustrated pattern formation behavior was elucidated by a scaling analysis. |
