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Theme 2 colloquium: "Adaptive and autonomous bioinspired self-assembled material systems" (Lecture)

Tuesday 13 March 2018Add to my calendar
from 16:00
prof. Andreas Walther (Albert-Ludwigs-University Freiburg, Germany)

prof. Andreas WaltherBiology is a source of inspiration for materials science by demonstrating macroscopic materials with advanced functionalities and excellent mechanical properties. However, although these rather static architectures stimulate large interest, even more thought-provoking are the dynamic, kinetically controlled processes and temporal evolution of structures in complex biological systems. These are orchestrated through feedback loops and require energy input and dissipation to allow non-equilibrium materials and full spatiotemporal control.

In man-made self-assemblies we have mastered to a large extent near-equilibrium structure formation in space and have gained an increasing understanding of how to construct very complex, hierarchically structured soft matter by using co-assemblies, competing interactions and hierarchical length scales. This has allowed to create real-life materials with unprecedented functionalities, inaccessible without delicate control over molecular interactions and sophisticated nano- and mesostructuration. The next step is to master temporal control in self-assemblies. This requires kinetic control of opposing reactions (built-up/destruction), internal feedback systems or the use of energy dissipation to sustain structures only as long as a chemical fuel is available. These approaches keep systems forcefully away from equilibrium and potentially allow neat access to temporal control.

In this talk I will present concepts for bioinspired materials systems formed in both static and dynamic conditions. The first part will deal with a concept exploiting antagonistic interactions (force, time and length scales) to make complex compartmentalized colloids based on sequence-defined multiblock copolymers. The second part will focus on a platform concept, which allows to program self-assembling systems outside equilibrium with a lifetime by kinetic control of promoter/deactivator pairs and simple internal feedback systems. This will be showcased for different self-assembling systems.

Recent references:

Time Programmed Dynamic Materials: Nano Lett. 2017, DOI: 10.1021/acs.nanolett.7b02165; Chem. Sci. 2017 DOI: 10.1039/C7SC00646B; Adv. Mat., 2017, DOI: 10.1002/adma.201606842, Nano Lett., 2015, 15, 2213, Angew. Chem. 2015, 54, 13258,

Review: Soft Matter 2015, 11, 7857.  Chem. Soc. Rev. 2017 DOI: 10.1039/C6CS00738D.

Evan Spruijt & Peter Korevaar