Electro-responsive surfaces with controllable wrinkling patterns for switchable light reflection–diffusion–grating devices

I. Ting Lin, Yeon Sik Choi, Casey Wojcik, Tiesheng Wang, Sohini Kar-Narayan, Stoyan K. Smoukov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Dynamic microscale surface topographies are desired in smart optics, controlling surface wettability and preventing marine biofouling. Voltage-controlled reversible responses have demonstrated potential for reliable reproducibility and stability, fast response, and for actuating thin films fixed over large solid surfaces. To obtain reversible deformation with regular geometric patterns, however, electrical methods have had to be coupled with mechanical stretching/bending and other ways to induce anisotropy. There is a great need and potential for on-demand electrical generation of programmable complex responsive surface patterns. Here we demonstrate a responsive polymer coating over an underlying pattern of counter electrodes which can be activated selectively. We present a patternable electrode printing method to achieve localized and structured wrinkling deformation without mechanical pre-force deformation. We discover that below a minimal separation distance, electrodes below the polymer act as a single electrode. We establish parameters that govern the alignment of wrinkles and quantify the regularity and direction of the new patterns between electrodes separated by larger than this distance. We analyze and quantify the regularity of the formed wrinkling patterns by four disorder metrics: box-counting fractal dimension, tortuosity, angle distribution, and branch number. We demonstrate the application of such electrode/wrinkles-on-demand patterning with a working multi-state light reflection–diffusion–grating device.

Original languageEnglish
Pages (from-to)51-61
Number of pages11
JournalMaterials Today
Volume41
DOIs
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
We wish to thank for financially support the European Research Council which supported us and this work through an ERC Starting Grant ( ERC-2014-STG-639526 , NANOGEN) to S.K-N, and ERC Grant EMATTER (#280078) and EPSRC Fellowship EP/R028915/1 to S.K.S. Y.S.C. is grateful for studentship funding through the Cambridge Commonwealth, European & International Trust . I-T.L. is grateful for studentship funding from Cambridge Trust and GSSA scholarship from Ministry of Education, Taiwan . T.W. thanks the China Scholarship Council (CSC) for funding and EPSRC Centre for Doctoral Training in Sensor Technologies and Applications (EP/L015889/1 and 1566990) for support.

Publisher Copyright:
© 2020 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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