Harnessing Dynamic Wrinkling Surfaces for Smart Displays

Abstract

Reversible and switchable wrinkling surfaces in response to various external stimuli have extensive potential applications. In this Letter, we prepared the reversible wrinkling on poly(dimethylsiloxane) (PDMS) surfaces, responsive to the solvents, by ultraviolet−ozone (UVO) treatment with/without mechanical prestrain. Based on the solvent-responsive wrinkling, three types of optical transparency dynamics were achieved easily in a single and simple film−substrate system, including (I) completely reversible transparency with controlled relaxation time and isotropic light scattering; (II) completely reversible transparency with anisotropic light scattering and tunable diffusion degree; and (III) incompletely reversible transparency. The reversibility and stability of wrinkles can be controlled by tailoring the solvent type, UVO exposure time, and mechanical prestrain. The underlying mechanisms for the three wrinkling dynamics have been clearly elucidated. The extremely simple material system and the facile but efficient technique pave a novel way for realizing versatile optical dynamics for smart displays.

Monodispersed polymer particles with tunable surface structures: Droplet microfluidic‐assisted fabrication and biomedical applications

“…More attention should be given to studying the relationship between the performances of polymer particles and their surface microstructures, especially the mechanism regarding how the surface microstructures of polymer particles affect cell phagocytosis. Moreover, polymer particles with responsive and controllable wrinkled surfaces would be more valuable 61 . Ma et al prepared a supermolecular polymer film containing acid gas responsive pyridine (P4VP‐nBA‐S) and photoisomerization hydroxyl distyrylpyridine (DSP‐OH) 61b .…”

Photo‐Polymerization Induced Hierarchical Pattern via Self‐Wrinkling

“…(Figure 2) In typical bilayer systems, the morphology of wrinkle is controlled by regulating the modulus or thickness of stiff top layer and soft substrate. [43][44][45][46] According to linear buckling theory, characteristic wavelength (λ) and amplitude (A) of wrinkle can be predicted as follows…”

Multiscale Soft Surface Instabilities for Adhesion Enhancement

“…The characteristic wavelength of the patterns is determined by the difference in elastic moduli between the two layers and scales linearly with the skin thickness [21]. Wrinkles have been widely used to design functional soft interfaces [22][23][24][25]. For instance, soft polydimethylsiloxane (PDMS) gels treated with oxygen plasma can easily generate wrinkles under compressions, and their adhesion energy can be quantitatively adjusted by mechanical strains [26,27].…”