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Siegel der Universität
Department für Chemie - Arbeitsgruppe Prof. Strey

complex fluids, microemulsions, phase behaviour, equation of state and dynamic

responsible: Prof. Dr. Reinhard Strey, Dr. Thomas Sottmann, Dr. Helge Klemmer

Phase behaviour and microstructure of microemulsions

The phase behaviour of ternary systems of the typ water - oil - nonionic surfactant was investigated systematically. Not only the alkanes [141] but also the influence of polymerisable oils to the phase behaviour of the microemulsions was investigated [157]. Amphiphilic blockcopolymers [148, 153, 155, 185, 204] and biologic relevant amphiphils [178, 200] were also characterized. A new research filed is the application of microemulsions in technical relevant processes, for example for development of new products. For that actually the phase behaviour of microemulsions with technical oils and technical surfactants is investigated. The analysis of the microstructure is carried out with small angle neutron scattering (SANS)static and dynamic light scattering (SLS, DLS), NMR-selfdiffusion experiments (FTPGSE) and 2H-NMR experiments, respectivley. Additional to these indirect methods, we have the possibility to fix the structure via extreme fast freezing and image the structure direct with an electron microscop.

 

Microemulsions under pressure

An other research area is microemulsions under high static pressure. For this research Dr. Kramer, together with Dr. Belkoura, the technical workshop (Metzner) and Röhl (electronics) developted different high pressure instruments.

 

Equation of state of microemulsions

In the field of theory we develope together with researchers of statistic thermodynamic an evolution of the theory of complex fluids. For this the scaling behaviour of the phase behaviour and the microstructure of microemulsions, with lyotropic meso-phases is investigated. The aim is, to establish an equation of state of microemulsions.

 

Self-aggregation- and formation kinetics of microemulsions

The kinetics of microemulsion formation and structural transformation is analysed with relaxation methods (T-jump, p-jump and stopped-flow) [154]. The current work focusses on the development of novel techniques such as periodically oscillating pressure jumps in combination with the TISANE technology or highly temperature stable stoppede-flow setups for time-resolved scattering techniques or various kind (SLS, DLS, SANS and SAXS).