The mechanically guided assembly that relies on the compressive buckling of strategically patterned 2D thin films represents a robust route to complex 3D mesostructures in advanced materials and even functional micro-devices. Based on this approach, formation of complex 3D configurations with suspended curvy features or hierarchical geometries remains a challenge. In this paper, we incorporate the prestrained shape memory polymer in the 2D precursor design to enable local rolling deformations after the mechanical assembly through compressive buckling. A theoretical model captures quantitatively the effect of key design parameters on local rolling deformations. The combination of precisely controlled global buckling and local rolling expands substantially the range of accessible 3D configurations. The combined experimental and theoretical studies over a dozen of examples demonstrate the utility of the proposed strategy in achieving complex reprogrammable 3D mesostructures.
Mechanically guided 3D assembly Reprogrammable 3D mesostructures Shape memory polymer Buckling Rolling
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X.G. and Z.X. contributed equally to this work. Y.Z. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 11502129 and 11722217) and the Tsinghua National Laboratory for Information Science and Technology. Y.H. acknowledges the support from the NSF (Grant Nos. CMMI1400169, CMMI1534120 and CMMI1635443). X.G. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 11702155).
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1.Department of Engineering Mechanics, Center for Mechanics and Materials and Center for Flexible Electronics Technology, AMLTsinghua UniversityBeijingChina
2.State Key Laboratory for Manufacturing and Systems Engineering, School of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina
3.Simpson Querrey Institute and Feinberg Medical School, Center for Bio-Integrated ElectronicsNorthwestern UniversityEvanstonUSA
4.Departments of Materials Science and Engineering, Biomedical Engineering, Chemistry, Mechanical Engineering, Electrical Engineering and Computer Science, and Neurological Surgery, Center for Bio-Integrated ElectronicsSimpson Querrey Institute for Nano/biotechnology Northwestern UniversityEvanstonUSA
5.Departments of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Center for Bio-Integrated ElectronicsNorthwestern UniversityEvanstonUSA