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Related Experiment Video

Updated: Mar 19, 2026

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Bimorph Silk Microsheets with Programmable Actuating Behavior: Experimental Analysis and Computer Simulations.

Chunhong Ye, Svetoslav V Nikolov, Ren D Geryak

  • 1Department of Biomedical Engineering, Tufts University , 4 Colby street, Medford, Massachusetts 02155 United States.

ACS Applied Materials & Interfaces
|June 17, 2016
PubMed
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This summary is machine-generated.

Silk protein sheets autonomously roll into 3D shapes due to selective swelling of an active ionomer layer. This controlled shape transformation offers potential for advanced biomimetic devices.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Science

Background:

  • Silk proteins offer tunable properties for advanced material fabrication.
  • Biomimetic self-assembly is a key area for developing novel microdevices.
  • Controlling shape-morphing at the microscale is crucial for micro-origami and implantable devices.

Purpose of the Study:

  • To fabricate and characterize microscaled self-rolling construct sheets from silk protein.
  • To investigate the mechanism of autonomous shape reconfiguration in silk bimorphs.
  • To explore the potential of silk-based rolling structures for biomimetic devices.

Main Methods:

  • Fabrication of silk bimorphs using silk ionomers (active layer) and cross-linked silk β-sheet (passive layer).
Keywords:
LbL assemblymicrofabricated biopolymersneutron reflectivityresponsive biomaterialssilk micro-origamitheoretical simulation

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  • Experimental characterization using neutron reflectivity to analyze layer swelling.
  • Computational simulation to understand shape reconfiguration mechanisms and stress distribution.
  • Analysis of the influence of geometric parameters (dimensions, thickness, aspect ratio) on biaxial stress.

    • Main Results:

    • Silk ionomer layers exhibited significant swelling (eightfold increase) upon deprotonation, while the silk β-sheet layer remained stable.
    • Selective swelling induced interfacial stress and out-of-plane forces, driving autonomous self-rolling into 3D constructs (tubules, helices).
    • Experimental and computational findings confirmed the role of interfacial stresses in programmed morphology.
    • Demonstrated fine-tuning of shape transformation based on microsheet geometry.

    Conclusions:

    • Silk-on-silk bimorph microsheets can autonomously self-roll into complex 3D structures.
    • The study elucidates the mechanism of shape transformation driven by selective swelling and interfacial stress.
    • Silk-based rolling/unrolling structures present a promising platform for polymer-based biomimetic devices, particularly for implant applications.