Repeated shape recovery of clustered nanopillars by mechanical pulling

Sang Moon Kim, Seong Min Kang, Chanseok Lee, Segeun Jang, Junsoo Kim, Hyein Seo, Won Gyu Bae, Shu Yang*, Hyunsik Yoon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

High-aspect-ratio (HAR) nanopillars are of interest for wetting, adhesion, and energy harvesting due to their superior surface properties, including large surface area and high compliance. However, their intrinsically low mechanical stability has been a major obstacle for practical applications that require repeated use and in wet and humid environments. Herein, we show a method that can recover the clustered or deformed HAR nanopillars to their original shapes by taking advantage of the mechanical compliance of the nanopillars toward pulling during a demolding process. The pillars can be repeatedly clustered and recovered many times. Our method is simple yet powerful to recover the clustered nanopillars over a large area (7 × 10 cm2). By taking advantage of the different optical properties of the clustered pillars vs. the straight ones, we demonstrate display and erasing of patterns and tunable wettability by stamping the nanopillars to induce clustering, followed by shape recovery via demolding of the pillars.

Original languageEnglish (US)
Pages (from-to)9608-9612
Number of pages5
JournalJournal of Materials Chemistry C
Volume4
Issue number40
DOIs
StatePublished - 2016

Funding

This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation of Korea under the Ministry of Science, ICT & Future Planning, Korea (NRF-2011-0031561), the Basic Science Research Program (2013R1A2A2A04015981), the Commercialization Promotion Agency for R&D Outcomes Grant funded by the Korean Government (MSIP) (2015, Joint Research Corporations Support Program), the R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea and the Development of Advanced 3D Printing Technology for the Realistic Artificial Hand funded by KIST-ETRI projects. SY acknowledges partial support from National Science Foundation (NSF), grant #CBET-1264808.

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry

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