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Wetting and electrokinetics

Interfacial phenomena at solid-liquid interfaces can be characterized by wetting and electrokinetic measurements. Contact angle, surface tension and electrokinetic potential (zeta potential) are the experimental parameters to quantify these phenomena.

By combining contact angle and electrokinetic measurements conclusions can be drawn regarding non-polar and/or polar groups as well as the kind of polar functional surface groups (acidic and/or basic).

Main topics:

Wetting

  • Interpretation of contact angle measurements (approaches to estimate the surface free energy of polymer surfaces, drop profile analysis, contact angle hysteresis, contact angles on rough and heterogeneous surfaces, hydrogels)
  • New strategies to determine the surface free energy of porous solid systems (capillary penetration into powder packings, fiber bundles, membranes, hollow fibers)
  • Measurement of surface tension of polymer melts

Electrokinetics

  • Investigations of charge building processes at interfaces: primary dissociation and adsorption processes
  • Expanding the opportunities of electrokinetic methods through the development of new measuring cells (patent: powder cell), new measurement strategies
  • Open up new fields of application for electrokinetics such as the investigation of adsorption processes of molecules /substances (surfactants / proteins and ) starches onto solid surfaces