Wrinkles with changing orientation and complexity in a single piece of thin film

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  • Lichao Feng, Huaihai Institute of Technology, Harbin Institute of Technology
  • ,
  • Minghui Chen, Guren Nanomaterials
  • ,
  • Yue Qian, Harbin Institute of Technology
  • ,
  • Jingwei Tian, Harbin Institute of Technology
  • ,
  • Jiachen Liu, Harbin Institute of Technology
  • ,
  • Shuang Niu, Harbin Institute of Technology
  • ,
  • Hanif Muhammad, Aarhus University
  • ,
  • Mingdong Dong
  • Jing Zhong, Harbin Institute of Technology

Wrinkles, as a form of mechanical instability, can be employed in many different areas, including self-cleaning coating, flexible electronics, smart adhesion, channel for microfluidic devices, and mechanical property measurements. After two decades of research, the wavelength and amplitude of wrinkles can be well controlled by proper design of physical properties of thin films and substrates. However, it is still very difficult to change their orientations and complexity in a single piece of thin film, which is critically important for many practical applications. In previous studies, the orientation of all the wrinkles are either along the same direction or can only be controlled to some extent by the patterning of relief structures which rely on the complicated lithography techniques and cannot be adjusted for a given substrate. Here, we employed the shape memory polymer (SMP) as a smart substrate, combined with local/selective heating to control the boundary conditions for the strain field, and realized the gradual change in the orientation of wrinkles in a single piece of thin film. The wrinkles with a gradual change in orientations exhibited angle-dependent colors. Furthermore, by changing the sequence of thin film coating and partial triggering of an SMP, complex surface features with a sharp interface can be obtained. Finite element simulation investigations uncover the basic principles and requirements that need to be satisfied, as well as the limitations of our method, to generate wrinkles with controlled orientations in a single piece of thin film.

Original languageEnglish
Article number245301
JournalJournal of Applied Physics
Number of pages8
Publication statusPublished - 28 Jun 2019

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