Curvature-controlled delamination patterns of thin films on spherical substrates
Summary: Periodic delamination patterns in multilayer structures have exhibited extensive applications in microelectronics and optics devices. However, delamination behaviors of a closed thin shell on spherical substrates are still elusive. Herein, a unique instability mechanism of buckle delaminati...
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doaj-9a1feece3a144e8fa2c03f4eab831b332021-06-27T04:39:25ZengElsevieriScience2589-00422021-06-01246102616Curvature-controlled delamination patterns of thin films on spherical substratesLiangliang Zhu0Haozhi Yuan1Kai Wu2Xueru Wang3Gang Liu4Jun Sun5Xiangbiao Liao6Xi Chen7School of Chemical Engineering, Northwest University, Xi'an 710069, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, ChinaDepartment of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA; Corresponding authorDepartment of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USASummary: Periodic delamination patterns in multilayer structures have exhibited extensive applications in microelectronics and optics devices. However, delamination behaviors of a closed thin shell on spherical substrates are still elusive. Herein, a unique instability mechanism of buckle delamination in a closed thin film weakly bonded to spherical substrates is studied by experiments, simulations, and theoretical analyses. The system of an Al film depositing on polystyrene spheres subjected to thermal mismatch strain is used for demonstration. Unlike traditional phenomena of wrinkling and wrinkle-induced delamination under increasing misfit strain, the weak adhesion between the core and shell results in a periodic pattern of delaminated hexagonal dimples that emerges directly from the smooth sphere configuration, before which no wrinkling occurs. Both substrate curvature and interfacial adhesion are revealed to control the dimple size and delamination width. These findings open a new venue for manifesting new controllable features for surface microfabrication.http://www.sciencedirect.com/science/article/pii/S2589004221005848condensed matter physicssoft matternanotechnology |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Liangliang Zhu Haozhi Yuan Kai Wu Xueru Wang Gang Liu Jun Sun Xiangbiao Liao Xi Chen |
spellingShingle |
Liangliang Zhu Haozhi Yuan Kai Wu Xueru Wang Gang Liu Jun Sun Xiangbiao Liao Xi Chen Curvature-controlled delamination patterns of thin films on spherical substrates iScience condensed matter physics soft matter nanotechnology |
author_facet |
Liangliang Zhu Haozhi Yuan Kai Wu Xueru Wang Gang Liu Jun Sun Xiangbiao Liao Xi Chen |
author_sort |
Liangliang Zhu |
title |
Curvature-controlled delamination patterns of thin films on spherical substrates |
title_short |
Curvature-controlled delamination patterns of thin films on spherical substrates |
title_full |
Curvature-controlled delamination patterns of thin films on spherical substrates |
title_fullStr |
Curvature-controlled delamination patterns of thin films on spherical substrates |
title_full_unstemmed |
Curvature-controlled delamination patterns of thin films on spherical substrates |
title_sort |
curvature-controlled delamination patterns of thin films on spherical substrates |
publisher |
Elsevier |
series |
iScience |
issn |
2589-0042 |
publishDate |
2021-06-01 |
description |
Summary: Periodic delamination patterns in multilayer structures have exhibited extensive applications in microelectronics and optics devices. However, delamination behaviors of a closed thin shell on spherical substrates are still elusive. Herein, a unique instability mechanism of buckle delamination in a closed thin film weakly bonded to spherical substrates is studied by experiments, simulations, and theoretical analyses. The system of an Al film depositing on polystyrene spheres subjected to thermal mismatch strain is used for demonstration. Unlike traditional phenomena of wrinkling and wrinkle-induced delamination under increasing misfit strain, the weak adhesion between the core and shell results in a periodic pattern of delaminated hexagonal dimples that emerges directly from the smooth sphere configuration, before which no wrinkling occurs. Both substrate curvature and interfacial adhesion are revealed to control the dimple size and delamination width. These findings open a new venue for manifesting new controllable features for surface microfabrication. |
topic |
condensed matter physics soft matter nanotechnology |
url |
http://www.sciencedirect.com/science/article/pii/S2589004221005848 |
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