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

Wed 711:10-14:00P5.13Crystallization kinetics in colloidal hard spheresobtained by a combined small angle light and Braggscattering setupRichard Beyer 11 University Mainz, Staudingerweg 7, 55128, Mainz, GermanyTo acquire high accurate data monitoring of the crystallization process in colloidal suspensionswe use an improved light scattering experiment based on the pioneering work of K. Schätzl [1, 2]that is capable of measuring the structure factor and the small angle signal simultaneously withsufficient time resolution. The small angle signal gives information about the density distributionwithin the sample while the Bragg peaks under larger angles originate from the structure evolution.We study the crystallization kinetics of swollen crosslinked polystyrene particles of diameter820nm [3] serving as a hard sphere model system if dispersed in 2-Ethylnaphtalene matchingboth the density and the refractive index [4]. In addition to the pure samples we also preparedsamples with added non-adsorbing, linear polystyrene (MW=9600g/mol). We will present firstmeasurements and their interpretation. References:[1] A. Heymann, A. Stipp. K. Schätzel, Il Nouvo Cimento 16D (8), 1995.[2] K. Schätzel, B. J. Ackerson, Phys. Rev. E, 48, 5, 1993.[3] S. Iacopini, T. Palberg, H. J. Schöpe, J. Chem. Phys. 130, 2009.[4] E. Bartsch, T. Eckert, P. Pies, H. Sillescu, J. Non-Cryst. Solids, 802, 307, 2002.13