Novel tools for the determination of second normal stress differences in complex fluids

Within this PhD thesis the specific interplay of nano-particles and short chain polymers in high shear flow fields will be investigated in order to optimise lubrication properties in sustainable and energy efficient applications. The determination of the full stress tensor, in particular second normal stress differences, requires the development of novel measurement techniques, that utilise the observation of stress induced interfacial deformations with sophisticated (rheo-)optical techniques to be developed within this thesis work.