Multidirectional Wrinkle Patterns Programmed by Sequential Uniaxial Strain with Conformal yet Nontraceable Masks

Hyunchul Park, Hyesung Cho, Albert S. Lee, Seunggun Yu, Jin Hong Lee, Kie Yong Cho, Soon Man Hong, Chong Min Koo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Surface wrinkling is a promising route to control the mechanical, electrical, and optical properties of materials in a wide range of applications. However, previous artificial wrinkles are restricted to single or random orientation and lacks selectivity. To address this challenge, this study presents multidirectional wrinkle patterns with high selectivity and orientation through sequential uniaxial strain with conformal polymeric shadow masks. The conformal but nontraceable polymeric stencil with microapertures are adhered to a flat substrate prior to oxidation, which forms discrete and parallel wrinkles in confined domains without any contamination. By fully investigating the process, this study displays compound topography of wrinkles consisting of wrinkle islands and surrounding secondary wrinkles on the same surface. With this topography, various diffusion properties are presented: from semi-transparent yet diffusive films to multidirectional diffusive films, which will be available for new types of optical diffuser applications.

Original languageEnglish
Article number1700311
JournalMacromolecular Rapid Communications
Volume38
Issue number19
DOIs
Publication statusPublished - 2017 Oct 1

Keywords

  • diffraction grating
  • multidirectional wrinkle
  • sequential uniaxial strain
  • soft template

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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