Authors:	Skarsetz, Oliver Slesarenko, Viacheslav Walther, Andreas
Title:	Programmable auxeticity in hydrogel metamaterials via shape-morphing unit cells
Online publication date:	31-Oct-2022
Year of first publication:	2022
Language:	english
Abstract:	Mechanical metamaterials recruit unique mechanical behavior that is unavailable in bulk materials from a periodic unit cell structure with a specific geometry. However, such metamaterials can typically not be reconfigured once manufactured. Herein, the authors introduce shape morphing of a hydrogel metamaterial via spatio-selective integration of responsive actuating elements to reconfigure the mesoscale unit cell geometry to reach programmable auxeticity on the macroscale. Via thermal control, the unit cell angle of a honeycomb structure can be precisely programmed from 68° to 107°. This results in negative, zero, or positive Poisson's ratio under applied tensile strain. The geometrical reconfiguration with resulting programmable auxeticity is predicted and verified by finite element (FE) simulation. This concept of shape-morphing hydrogel metamaterials via the addition of actuating struts into otherwise passive architectures offers a new strategy for reconfigurable metamaterials and extends applications of hydrogels in general. It can be readily extended to other architectures and may find applications in mechanical computing as well as soft robotics.
DDC:	540 Chemie 540 Chemistry and allied sciences 660 Technische Chemie 660 Chemical engineering
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8127
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Advanced science 9 23
Pages or article number:	2201867
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2022
ISSN:	2198-3844
Publisher DOI:	10.1002/advs.202201867
Appears in collections:	DFG-491381577-G