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Swelling/deswelling-induced reversible surface wrinkling on layer-by-layer multilayers.

Jing Hou1, Qiaoyuan Li, Xue Han

  • 1School of Materials Science and Engineering, Tianjin University , Tianjin 300072, P. R. China.

The Journal of Physical Chemistry. B
|November 19, 2014
PubMed
Summary
This summary is machine-generated.

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This study introduces layer-by-layer (LbL) assembly for creating tunable, swelling-responsive wrinkled films. Researchers observed reversible wrinkle pattern evolution in (poly(acrylic acid)/poly(ethylene glycol)) multilayers on PDMS, offering control over film properties.

Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • Layer-by-layer (LbL) assembly is a versatile technique for fabricating multilayer films.
  • Wrinkle formation in thin films is driven by mechanical instability, often induced by stress gradients.
  • Understanding swelling/deswelling-induced wrinkle evolution is crucial for developing responsive materials.

Purpose of the Study:

  • To investigate the evolution of wrinkles in film/substrate systems induced by swelling and deswelling for the first time.
  • To explore the use of LbL-assembled hydrogen-bonded multilayers, specifically (poly(acrylic acid)/poly(ethylene glycol))n, on a poly(dimethylsiloxane) substrate.
  • To analyze the influence of experimental conditions on wrinkle patterns and swelling kinetics.

Main Methods:

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  • Fabrication of (PAA/PEG)n multilayer films on PDMS substrates using LbL technique.
  • Thermal cross-linking of H-bonded multilayers to induce spontaneous labyrinth wrinkles.
  • Controlled swelling in water and deswelling by reheating to observe reversible wrinkle evolution.
  • Systematic investigation of factors like film thickness, outermost layer, and pH on wrinkle patterns.

    • Main Results:

    • Demonstrated reversible evolution of swelling-sensitive wrinkles, including labyrinth patterns, smooth states, and dimples.
    • Observed that wrinkle evolution upon deswelling depends on reheating temperature and the specific pattern formed during swelling.
    • Identified the relationship between wrinkling behavior and swelling/deswelling-induced stress states.
    • Showcased the tunability of instability-driven patterns through LbL assembly and additional layers.

    Conclusions:

    • LbL assembly combined with additional layers provides significant control over fabricating multifunctional film/substrate systems.
    • The study successfully demonstrates tunable, reversible wrinkle evolution in response to swelling/deswelling stimuli.
    • This approach offers a pathway to engineer advanced properties and expand applications for responsive materials.