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Institute
Sonstige beteiligte Institutionen
- Fraunhofer-Institut für Silicatforschung ISC (6)
- Fraunhofer-Institut für Silicatforschung (3)
- Fraunhofer Institut für Silicatforschung ISC (2)
- Bayerisches Geoinstitut, Universität Bayreuth (1)
- Fraunhofer Insitut für Silicatforschung ISC (1)
- Fraunhofer Institut für Silicatforschung (Würzburg) (1)
- Fraunhofer Institute for Silicate Research ISC in Würzburg (1)
- Fraunhofer-Institut Würzburg (1)
- Fraunhofer-Institut für Silicatforschung ISC, Würzburg (1)
- Fraunhofer-Institute for Silicate Research ISC (1)
The detection of smallest mechanical loads plays an increasingly important role in many areas of advancing automation and manufacturing technology, but also in everyday life. In this doctoral thesis, various microparticle systems were developed that are able to indicate mechanical shear stress via simple mechanisms. Using a toolbox approach, these systems can be spray-dried from various nanoscale primary particles (silica and iron oxide) to micrometer-sized units, so-called supraparticles. By varying the different building blocks and in combination with different dyes, a new class of mechanochromic shear stress indicators was developed by constructing hierarchically structured core-shell supraparticles that can indicate mechanical stress via an easily detectable color change. Three different mechanisms can be distinguished. If a signal becomes visible only by a mechanical load, it is a turn-on indicator. In the opposite case, the turn-off indicator, the signal is switched off by a mechanical load. In the third mechanism, the color-change indicator, the color changes as a result of a mechanical load. In principle, these indicators can be used in two different ways. First, they can be incorporated into a coating as an additive. These coatings can be applied to a wide range of products, including food packaging, medical devices, and generally any sensitive surface where mechanical stress, such as scratches, is difficult to detect but can have serious consequences. Second, these shear stress indicators can also be used directly in powder form and for example then applied in 3D-printing or in ball mills. A total of six different shear stress indicators were developed, three of which were used as additives in coatings and three were applied in powder form. Depending on their composition, these indicators were readout by fluorescence, UV-Vis or Magnetic Particle Spectroscopy. The development of these novel shear stress indicator supraparticles were successfully combined molecular chemistry with the world of nano-objects to develop macroscopic systems that can enable smart and communicating materials to indicate mechanical stress in a variety of applications.