Geometry-Dependent Stripe Rearrangement Processes Induced by Strain on Preordered Microwrinkle Patterns

Abstract

A preordered microwrinkle pattern on a metal-capped surface of a soft elastomer is employed to elucidate the elementary buckling phenomenon during strain-induced stripe rearrangement processes. The preordered one-dimensional stripe tends to align perpendicular to the direction of strain reversibly when lateral compressive strain is applied on the substrate at some angle phi with respect to the stripe orientation. For any value of strain, the film surface can be decomposed in domains containing stripes with two different orientations, namely the original and applied strain orientations. As strain is increased, the domains of the second type of stripes progressively grow and invade the whole surface. Interestingly, the domain shapes during growth are composed of parallelogram units that simply depend on phi and stripe wavelength. Moreover, domain growth proceeds in characteristic directions depending on the shape of the domain unit.

Highly oriented tunable wrinkling in polymer bilayer films confined with a soft mold induced by water vapor

“…Although alot of literature have reported methods to generate waves, including wrinkles developed by heat expansion [15][16][17][18][19][20][21][22][23][24][25][26][27] based on the different expansion coefficients between the metal or oxide film and the elastomer, by stretching [8][9][10][11]13,14,[28][29][30][31] or compressing [32][33][34] an elastomer based on different Young's moduli between the bilayers, and by a chemical reaction-diffusion process based on periodic precipitation, 35 only a few studies have concentrated on the ordered wrinkling of the surface induced by solvent evaporation. [36][37][38][39][40] Kwon et al 36 studied the morphological dynamics of the surface wave pattern of metal-capped polymer bilayer other than only an elastic polymer layer 37,38 and considered that the characteristic wavelength of the patterns was dependent on the volume fraction of the solvent.…”

Gas Permeation, Mechanical Behavior and Cytocompatibility of Ultrathin Pure and Doped Diamond-Like Carbon and Silicon Oxide Films

“…However, this excludes the compound properties and, thus, the influences of wrinkling on elastic properties. Generally, wrinkles smooth out under tensile stresses, providing higher total substrate strain to film failure [57]. However, studies which included such substrate material behavior (thus, giving information about the compliance of substrate and film) were previously published by the authors [58]).…”

“…The OTR values for a-C:H:Si, a-C:H:Ti, and SiO x films with lower defect density, but domed surfaces are significantly higher. A positive influence seems to occur with wrinkling, which increases the mechanical tensile strain of fracture: Before fracture, wrinkles will smooth out and form a flat surface, providing up to 5% elasticity [57]. The highest OTR value for a-C:H:Ti can both be influenced by the low elasticity index of this material and the quite porous structure (see above).…”

Combined influence of substrate relief and mechanical compression on topographical evolution of surface wrinkling

“…In-plane methods mainly include substrate reliefs [11] , surface modification of substrates [12] and pre-strain of substrates [13] . Out-of-plane methods mainly include templates for pattern generation [14] and compression [15] . Currently the most investigations mainly focus on single method, whereas the composite action between in-plane and out-of-plane were rarely mentioned.…”