Dr. Pedro Diaz-Leyva     (Mexico)

Examination of dynamic properties in binary mixtures of Hard Sphere Colloids (PS-Microgels) with Forced Rayleigh Scattering and rheological experiments to study the dependence of the viscosity in binary mixtues on different compositions. 

Gastwissenschaftler

Dr. Veniaminov, A .     (Russia)

studies of slow diffusionin 3D polymer materials for holography (since 1984) and latex (films (1998 -…) by means of holographic grating relaxation ( forced Rayleigh scattering) technique.

Polymer synthesis and characterization: Emulsion polymerization, structure-property relationship studies, reactive surfactants, controlled radical polymerization, Static and dynamic light scattering, Thermal and rheological properties. Morphological characterization. Film formation of aqeous dipersions by Forced Rayleigh Scattering. 

PHD Students

Dr. Kozina, Anna (Russia)

Study of the phase behavior of highly concentrated colloidal dispersions. Essentially, the dispersions are internally cross-linked polystyrene particles in the index-matching solvent. The regions of interest: the vicinity of the repulsive glass transition, attractive glass transition and fluid – gel transition.

The studies of the structure and dynamics of these systems using Static and Dynamic Light Scattering. Investigation of the viscoelastic properties of the dispersions with Conventional (Bulk) Rheology and Microrheology.

Synthesis of new model colloids. Synthesis of polymer microgels with diameters from less than 100 nm up to micrometer size via emulsion polymerization. Modification of particles by polymer analogous reactions (e.g. photo initiators). Preparation of copolymer particles with functional monomers (e.g. dyes). Synthesis of colloids with core-shell morphologies. Mechanistic studies of the emulsion polymerization of microgels. Analysis and characterisation of the microgels by light scattering (DLS, SLS), optical and electron microscopy, AFFF and spectroscopic methods (IR, NMR).

Dr. Vasquez, Daniela

Investigation of polymer-colloid interactions using dynamic-light-scattering and the investigation of  one- and multiparticles-dynamics using digital videomicroscopy (DVM)

Dr. Stilke, Carl

Characterisation of colloidal dispersions. Investigation of the glass- and gel-line in concentrated binary colloid mixtures with variable interactions. Applied methods: Forced Rayleigh Scattering (FRS), light scattering methods (SLS, DLS) and rheology.

Sagawe, Dominik

Characterisation of colloidal dispersions. Investigation of the gel-line in concentrated dispersions with variable interactions. Applied methods: light scattering methods (SLS, DLS, multispeckle) and rheology

Diploma Students

Semmelbeck, Martin

"Synthesis of photobleachable organic dyes and their application in Forced Rayleigh Scattering (FRS)"

Dietrich, Mathias

Measurement of static structure factors for the determination of short range order in polystyrene microgel dispersions. Calculation of static structure factors of  many component dispersion via statistical mechanical theories aiming at understanding effects of polydispersityand softly repulsive interactions on the short range order.

Used methods: static light scattering; algorithms for the numerical solution of the  Ornstein-Zernike equation for many component systems.

Liebetraut, Peter

Measurements with confucal Raman microscope.

Technical Staff

David Freytag 

Apprentice (chemical laboratory worker)

Syntheses of Colloids

Ina von Aasen  

Apprentice (chemical laboratory worker)

Syntheses of Colloids