Moisture‐Responsive Wrinkling Surfaces with Tunable Dynamics

The wrinkle dynamics (such as reversibility and stability) of human skin are affected by the external stimuli, as well as the skin's structure and mechanical properties. Inspired by these tunable responses, three types of moisture‐responsive wrinkle dynamics are achieved, for the first time, th...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-06, Vol.29 (24), p.n/a
Main Authors: Zeng, Songshan, Li, Rui, Freire, Stephan G., Garbellotto, Vivian M. M., Huang, Emily Y., Smith, Andrew T., Hu, Cong, Tait, William R. T., Bian, Zichao, Zheng, Guoan, Zhang, Dianyun, Sun, Luyi
Format: Article
Language:English
Subjects:
Crosslinking
Devices
Dynamic stability
Dynamics
Encryption
Indicators
Materials science
Mechanical properties
Moisture
moisture‐responsive dynamics
polydimethylsiloxane
polyvinyl alcohol
soft matter
Stiffness
Stimuli
Swelling
Thickness
Wrinkling
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Summary:The wrinkle dynamics (such as reversibility and stability) of human skin are affected by the external stimuli, as well as the skin's structure and mechanical properties. Inspired by these tunable responses, three types of moisture‐responsive wrinkle dynamics are achieved, for the first time, through a single film–substrate system. These dynamics include: (1) completely reversible wrinkles formation; (2) irreversible wrinkles formation I: the initially formed wrinkles can be permanently erased and never reappear; and (3) irreversible wrinkles formation II: once the wrinkles form, they can no longer be erased. The key to success is to control the stiffness and thickness ratios of the film and the substrate, and tailor the crosslink degree/gradient of the film to allow for moisture‐dependent changes of modulus and swelling degree. These unique responsive dynamics motivate the invention of a series of optical devices triggered by moisture, including anticounterfeit tabs, encryption devices, water indicators, light diffusors, and antiglare films. This study also paves the road for further understanding of the skin wrinkling dynamics and manipulation. Three types of bilayer poly(vinyl alcohol) (PVA)–poly(dimethylsiloxane) (PDMS) wrinkling devices are prepared, which demonstrate reversible, temporary or permanent wrinkles as moisturized, providing a route of tuning the optical properties of a wrinkling surface for various applications. The design is achieved by controlling the stiffness and thickness of the PVA film and PDMS substrate, as well as tailoring the crosslink degree/gradient of the PVA film.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201700828