Nano-Micro Letters

Bioinspired Multiscale Wrinkling Patterns on Curved Substrates: An Overview

Yinlong Tan1, Biru Hu1, Jia Song1, Zengyong Chu1, *, Wenjian Wu1, *

Abstract
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Nano-Micro Lett. (2020) 12: 101

First Online: 25 April 2020 (Review)

DOI:10.1007/s40820-020-00436-y

*Corresponding author. E-mail: chuzy@nudt.edu.cn (Zengyong Chu); wjwu67@nudt.edu.cn (Wenjian Wu)

 

Abstract

 


Toc

The surface wrinkling of biological tissues is ubiquitous in nature. Accumulating evidence suggests that the mechanical force plays a significant role in shaping the biological morphologies. Controlled wrinkling has been demonstrated to be able to spontaneously form rich multiscale patterns, on either planar or curved surfaces. The surface wrinkling on planar substrates has been investigated thoroughly during the past decades. However, most wrinkling morphologies in nature are based on the curved biological surfaces and the research of controllable patterning on curved substrates still remains weak. The study of wrinkling on curved substrates are critical for understanding the biological growth, developing three-dimensional (3D) or four-dimensional (4D) fabrication techniques, and creating novel topographic patterns. In this review, fundamental wrinkling mechanics and recent advances in both fabrications and applications of the wrinkling patterns on curved substrates are summarized. The mechanics behind the wrinkles is compared between the planar and the curved cases. Beyond the film thickness, modulus ratio, and mismatch strain, the substrate curvature is one more significant parameter controlling the surface wrinkling. Curved substrates can be both solid and hollow with various 3D geometries across multiple length scales. Up to date, the wrinkling morphologies on solid/hollow core-shell-bilayered spheres and cylinders have been simulated and selectively produced. Emerging applications of the cuved topographic patterns have been found in smart wetting surfaces, cell culture interfaces, healthcare materials, and actuators, which may accelerate the development of artificial organs, stimuli-responsive devices, and micro/nano fabrications with higher dimensions.


 

Keywords

Surface instability, Wrinkling patterns, Substrate curvature, Micro/nano fabrications, Low-dimensional materials

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