Interdigitated Three-Dimensional Heterogeneous Nanocomposites for High-Performance Mechanochromic Smart Membranes

Haomin Chen, Donghwi Cho, Kwonhwan Ko, Caiyan Qin, Minsoo P. Kim, Heng Zhang, Jeng Hun Lee, Eunyoung Kim, Dawon Park, Xi Shen, Jinglei Yang, Hyunhyub Ko, Jung Wuk Hong, Jang Kyo Kim, Seokwoo Jeon

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Mechanochromic smart membranes capable of optical modulation have great potential in smart windows, artificial skins, and camouflage. However, the realization of high-contrast optical modulation based on light scattering activated at a low strain remains challenging. Here, we present a strategy for designing mechanochromic scattering membranes by introducing a Young's modulus mismatch between the two interdigitated polydimethylsiloxane phases with weak interfaces in a periodic three-dimensional (3D) structure. The refractive index-matched interfaces of the nanocomposite provide a high optical transparency of 93%. Experimental and computational studies reveal that the 3D heterogeneity facilitates the generation of numerous nanoscale debonds or "nanogaps"at the modulus-mismatching interfaces, enabling incident light scattering under tension. The heterogeneous scatterer delivers both a high transmittance contrast of >50% achieved at 15% strain and a maximum contrast of 82%. When used as a smart window, the membrane demonstrates effective diffusion of transmitting sunlight, leading to moderate indoor illumination by eliminating extremely bright or dark spots. At the other extreme, such a 3D heterogeneous design with strongly bonded interfaces can enhance the coloration sensitivity of mechanophore-dyed nanocomposites. This work presents insights into the design principles of advanced mechanochromic smart membranes.

Original languageBritish English
Pages (from-to)68-77
Number of pages10
JournalACS Nano
Volume16
Issue number1
DOIs
StatePublished - 25 Jan 2022

Keywords

  • 3D nanostructures
  • heterogeneous
  • mechanochromic
  • smart windows
  • stretchable

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