Dresden 2017 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Bioinspired Functional Materials II
CPP 10.2: Talk
Monday, March 20, 2017, 15:15–15:30, ZEU 114
Actuated Self-(Un)rolling Silk Microstructures: Rings, Tubules, and Hhelical Tubules — •Chunhong Ye1,2, Svetoslav V Nikolov3, Ren Geryak2, Rossella Calabrese4, Alexander Alexeev3, David L Kaplan4, and Vladimir V Tsukruk2 — 1Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research, Dresden, 01169 Germany — 2School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 USA — 3Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 USA — 4Department of Biomedical Engineering, Tufts University, 4, Colby street, Medford, MA 02155 USA
We demonstrated facile, reversible, fast self-rolling biopolymer microconstructs using sandwiched active-passive, silk-on-silk morphology. We experimentally showed and theoretically confirmed that the shape of individual sheets effectively controls biaxial stresses within these sheets which can self-roll themselves into distinct 3D structures including microscopic rings, tubules, and helical tubules. This is a unique example of tailoring self-rolled 3D geometries though shape design without changing the inner morphology of active bimorph nanomaterials. Furthermore, the self-rolling direction, percentage shape, and diameter of the silk microtubes can be readily controlled over the geometry of the 2D microsheets, such as lateral dimension, thickness and aspect ratio. The microstructrues indicated highly reversible rolling/unrolling by alternating the external pHs, attributed to the significant swelling/deswelling of silk active layer at different pHs.