Tue August 22nd 2017
11:00 – 12:00
ZH286
Seminar Engineering damage self-reporting nanocapsules to monitor crack appearance and healing in transparent coatings
Markus Bannwarth

Details:

The exposure of artificial materials to environmental stress causes their damaging and eventually leads to failure. Especially coatings on top of corrosive materials have to be faultless to prevent initiation of a cascade of self-degradative, corrosive processes. Hence, it is important to engineer coatings with two indication functions: i) To highlight when a coating is damaged and ii) to indicate when it is being healed again. In order to equip coatings with such autonomous reporting functions, we designed and integrated nanocapsules that can self-indicate their damaging via a color development. Consequently, whenever the coating is damaged, the capsules break and highlight the damaged spot. As a second feature, the color development is reversed and discoloration occurs in the presence of (self-)healing compounds to allow monitoring of the healing process. Thus, in a first step damages are being highlighted via color “turn-on” and, in a subsequent second step, a propagating healing reaction “turns-off” the damage indication system to trace the healing reaction and allow full control over the healing process.


CV:
Markus studied Chemistry at the University of Mainz and the University of Toronto, CA (Prof. M. A. Winnik). Subsequently, he performed his PhD at the Max Planck Institute for Polymer Research (MPI-P), Harvard University, USA (Prof. D. Weitz) and the Universidade Federal de Rio Grande do Sul, BR (Prof. C. Petzhold). He then worked for the Swiss Federal Laboratories for Materials Science and Technology (CH) before rejoining the MPI-P as group leader.
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