Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster Session III
CPP 33.13: Poster
Dienstag, 13. März 2018, 14:00–16:00, Poster C
Comparison of different measurement techniques for optical contrast factors for ternary mixtures — •Marcel Schraml, Thomas Triller, Roman Reh, and Werner Köhler — Institute of Physics, University of Bayreuth, 95440 Bayreuth, Germany
Non-isothermal diffusion in ternary mixtures is extensively studied both on ground and under microgravity conditions on the Internation Space Station ISS (ESA/Roscosmos, DCMIX3). In most cases are optical, contactless techniques the method of choice. These methods have the disadvantage that the measured data need to be transformed from the refractive index space into the concentration space. Therefore the contrast factor matrix aij = ( ∂ ni / ∂ cj)p,T,ck≠ j has to be inverted. We are using self-designed experiments which are based on refraction or interferometry, because commercial refractometers are not accurate enough or can not provide data in a broad temperature range and at wavelengths covering the entire visible spectrum up to the near IR. On the poster we will explain the difficulty of the contrast factor determination and discuss the different mesurement methods.