期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 36, 页码 30900-30908出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07837
关键词
programmable polymer; responsive; bioinspired; laser direct writing; origami
资金
- University of Missouri Columbia start-up fund
- University of Missouri System Research Board
- University of Missouri Research Council
- Oak Ridge Associated Universities (ORAU) Ralph E. Powe Junior Faculty Award
- NSF IGERT program [1069091]
- NSF [1429294]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1429294] Funding Source: National Science Foundation
- Direct For Education and Human Resources
- Division Of Graduate Education [1069091] Funding Source: National Science Foundation
Responsive materials with functions of forming three-dimensional (3D) origami and/or kirigami structures have a broad range of applications in bioelectronics, metamaterials, microrobotics, and microelectromechanical (MEMS) systems. To realize such functions, building blocks of actuating components usually possess localized inhomogeneity so that they respond differently to external stimuli. Previous fabrication strategies lie in localizing nonswellable or lessswellable guest components in their swellable host polymers to reduce swelling ability. Herein, inspired by ice plant seed capsules, we report an opposite strategy of implanting swellable guest medium inside nonswellable host polymers to locally enhance the swelling inhomogeneity. Specifically, we adopted a skinning effect induced surface polymerization combined with direct laser writing to control gradient of swellable cyclopentanone (CP) in both vertical and lateral directions of the non-swellable SU-8. For the first time, the laser direct writing was used as a novel strategy for patterning programmable polymer gel films. Upon stimulation of organic solvents, the dual-gradient gel films designed by origami or kirigami principles exhibit reversible 3D shape transformation. Molecular dynamics (MD) simulation illustrates that CP greatly enhances diffusion rates of stimulus solvent molecules in the SU-8 matrix, which offers the driving force for the programmable response. Furthermore, this bioinspired strategy offers unique capabilities in fabricating responsive devices such as a soft gripper and a locomotive robot, paving new routes to many other responsive polymers.
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