Material assembly from collective action of shape-changing polymers.

Autor: Abdelrahman MK; Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA., Wagner RJ; Mechanical Engineering Department, Materials Science and Engineering Program, University of Colorado, Boulder, CO, USA.; Department of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA., Kalairaj MS; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Zadan M; Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA., Kim MH; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Jang LK; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA.; Materials Engineering Division, Lawrence Livermore National Laboratory, Livermore, CA, USA., Wang S; Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA., Javed M; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Dana A; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Singh KA; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Hargett SE; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Gaharwar AK; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA., Majidi C; Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA., Vernerey FJ; Mechanical Engineering Department, Materials Science and Engineering Program, University of Colorado, Boulder, CO, USA., Ware TH; Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA. Taylor.Ware@tamu.edu.; Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA. Taylor.Ware@tamu.edu.
Jazyk: angličtina
Zdroj: Nature materials [Nat Mater] 2024 Feb; Vol. 23 (2), pp. 281-289. Date of Electronic Publication: 2024 Jan 04.
DOI: 10.1038/s41563-023-01761-4
Abstrakt: Some animals form transient, responsive and solid-like ensembles through dynamic structural interactions. These ensembles demonstrate emergent responses such as spontaneous self-assembly, which are difficult to achieve in synthetic soft matter. Here we use shape-morphing units comprising responsive polymers to create solids that self-assemble, modulate their volume and disassemble on demand. The ensemble is composed of a responsive hydrogel, liquid crystal elastomer or semicrystalline polymer ribbons that reversibly bend or twist. The dispersions of these ribbons mechanically interlock, inducing reversible aggregation. The aggregated liquid crystal elastomer ribbons have a 12-fold increase in the yield stress compared with cooled dispersion and contract by 34% on heating. Ribbon type, concentration and shape dictate the aggregation and govern the global mechanical properties of the solid that forms. Coating liquid crystal elastomer ribbons with a liquid metal begets photoresponsive and electrically conductive aggregates, whereas seeding cells on hydrogel ribbons enables self-assembling three-dimensional scaffolds, providing a versatile platform for the design of dynamic materials.
(© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
Externí odkaz: