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Class II hydrophobins are amphiphilic proteins produced by filamentous fungi with the tendency to accumulate at the air-water interface. They show unusual adsorption kinetics with a coverage-independent adsorption rate, which was monitored with ellipsometry and atomic force microscopy. A theoretical model was introduced to identify the underlying mechanism.
The motivation and the measurement setup for large fast-scanning piezoresistive cantilevers are presented. The theory behind the measurements of mechanical properties through contact resonance is explained. Results of such measurements on two kinds of polymer are compared to results from force distance curves. Noise, time-dependency and dependency of the results on the vibration mode are identified as challenges of contact resonance.
At the Stakeholder meeting of the EMPIR project “Multifunctional ultrafast microprobes for on-the-machine measurements”, details about two measurement modes were presented. Force distance curves and contact resonance measurements are compared. The basic principles are explained and exemplary measurements concerning mechanical properties of polymers are shown.