Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Flow-Induced Structures in Complex Fluids - Part II (joint session CPP/ DRG, Deutsche Rheologische Gesellschaft/ DY)

DY 46.8: Vortrag

Donnerstag, 19. März 2015, 11:30–11:45, C 264

Combined rheology and structure analysis techniques — •Jörg Läuger — Anton Paar Germany, Ostfildern, Germany

The simultaneous use of rheological and structural analysis techniques is helpful to gain a better understanding of the dependencies between the microstructure and the mechanical properties of complex fluids. Optical techniques like Small-Angle-Light-Scattering (SALS) or microscopy measurements have been used in combination with rheology. Other techniques are Small-Angle-X-ray (SAXS) and Neutron (SANS) Scattering. The decision on which technique to choose is based on the size and type of the structure as well as on the general sample properties to be investigated. Density and orientation fluctuations within a sample, averaged over the whole scattering volume, can be well monitored by SALS. The advantage that individual structure elements are seen in microscopy can be turned into a disadvantage when combined with a rheometer. At larger shear rates or deformations the specific structure element easily moves out of the field of view and can*t be followed during an experiment. A way to overcome this issue is the use of a rheometer employing two motors operating in a counter rotation or counter oscillation fashion. The aim of this paper is to give an overview over the various techniques used for structural investigations simultaneous to rheological measurements and to introduce some new techniques and methods.