Seminarium Zakładu Mechaniki i Fizyki Płynów

High Pressure Rheology of Liquid Bio-Materials

Dr-Ing. Albert Baars, University of Erlangen-Nürnberg, Institute of Fluid Mechanics

środa, 20 grudnia 2006

The applications of pressures up to 1000 MPa enable the modification of intra and inter molecular interactions of liquid biomaterials. This can lead to modified functional properties of the concerned macromolecules (e.g. activation / inactivation of enzymes), the creation of new molecular structures (aggregation, gelification) or the preservation of foods. Furthermore, pressure can serve as tool to gain a deeper physical understanding of matter. This presentation focuses on the impact of high pressure on the rheological behaviour of different liquid biomaterials such as aqueous sucrose, ß-lactoglobulin, and gelatine solutions. Therefore, different in-situ measurement techniques as well as theoretical approaches are applied to elucidate the connection between viscous behaviour and molecular structure (rolling ball viscosimeter, shear wave viscosimeter, dynamic light scattering, molecular dynamic simulation).