8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P5.96Wed 711:10-14:00A new two colour dynamic light scattering setupAchim Lederer 1 and Hans Joachim Schöpe 11 University of Mainz, Staudinger Weg 7, 55128, Mainz, GermanyLight scattering is one of the most powerful tools in soft matter physics to study the structure,kinetics and dynamics of the system of interest. Unfortunately effects due to multiple scatteringcomplicate the evaluation in colloidal systems. Particularly measurements of structure factors andparticle form factors are affected strongly by multiple scattering. There are several techniques tosuppress multiple scattering, like theoretical corrections, index matching or cross correlation techniques.In the latter, two identical but distinguishable dynamic light scattering experiments areperformed simultaneously. Scattered photons are correlated and hence detected in the normalizedcross correlation function, as long as their scattering vectors and their origins are identical. Multiplescattered light has different q-vectors and origins and hence does not contribute ([1], [2]).In Mainz we recently developed a new TCDLS Setup. Unlike previous TCDLS experiments werealized a small and compact setup with fibre optical illumination and detection. This ensures aneasy and long time stable alignment. The machine is in the test stage. Measurements by the newdesigned TCDLS setup are compared with conventional SLS data. The performance of the TCDLSwill be discussed.[1] K. Schätzel, J Modern Opt 38, 1849 (1991).[2] P. N. Pusey, Current Opinion in Colloid & Interface Science 4, 177 (1999).96