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Department of Chemical and Pharmaceutical Engineering |
Methods:
Experimental methods available in the Department of Chemical Engineering:
Size and mass distributions, diffusion and virial coefficients, and zeta-potential of colloid particles and macromolecules:
Static light scattering (SLS) and dynamic light scattering (DLS) for size distribution, molecular weight distribution, and virial coefficients.
Zeta-potential of solid particles and emulsion droplets by electrophoretic light scattering.
NMR for molecular diffusion coefficient and drop size determination.
Gel electrophoresis.
Thin layer chromatography.
Interfacial Tension and Adsorption:
Wilhelmy plate method.
De Nouy ring method.
Maximum bubble pressure method (MBPM).
Drop shape analysis (DSA) of pendant and sessile drops.
Stopped jet method for fast adsorption kinetics (from 0.05 s up to 5 minutes).
Capillary pressure tensiometry (CPT) for equal density liquids.
Langmuir trough.
Ellipsometry for adsorption and adsorption kinetics on fluid and solid surfaces.
ΔV potential and Brewster angle microscopy (BAM).
Spinning drop method for ultra-low interfacial tensions.
Interfacial rheology and Bulk rheology:
Oscillating drop method (ODM) by drop-shape analysis (DSA) and by capillary pressure tensiometry (CPT).
Expanding drop method (EDM).
Langmuir trough with oscillating barriers.
Sliding solid particle method.
Rheometer for surface shear rheology.
Rotational rheometer for bulk rheology of liquids, foams, emulsions, dispersions.
Squeeze-flow rheometry.
Thin Liquid Films (TLF):
Foam and emulsion films in a horizontal capillary cell.
Foam and emulsion films in a porous plate cell.
Foam Films with exchange of the film-forming liquid.
Vertical foam films on different frames (rectangular, circular, 3- and 4- legs, etc.).
Film trapping technique (type of surface force apparatus) for measuring the interaction of micron sized drops.
Contact Angle Measurement and Surface Energy Determination:
Interferometric methods for contact angles of thin films.
Shape of single interfaces and thin films by differential interferometry.
Contact angles of micron size particles by interferometric method and film trapping technique.
Goniometric method for contact angles of fluid particles on solid surfaces or solid particles attached to fluid interfaces.
Foams and Emulsions:
Growth and stability of foams by Ross-Miles test.
Growth and stability of foams by gas barbotage (Bickerman’s method).
Growth and stability of foams by Bartsch method (manual and automated).
Antifoam effect in Automated shake test.
Membrane emulsification.
Emulsification in a narrow gap homogenizer.
Formation of fine emulsion and suspensions with a laboratory rotor-stator homogenizer Ultra Turrax.
Emulsion stability by centrifugation.
Drop and bubble size distributions by video-microscopy.
Model Studies of Dispersions:
Kinetics of solubilization by optical observations of diminishing drops.
Drop removal in axisymmetric flow field.
Drop and particle deposition on solid surfaces.
Lifetime of rising bubbles and drops.
Lifetime of colliding drops and bubbles.
Spectral and Optical Characterization of solutions and thin layers:
Refractometry of high accuracy (5 significant digits) for measuring refractive indices of liquids, solutions, and suspensions.
UV-VIS spectrophotometer for measuring low surfactant/protein concentrations.
Method for measuring the transmittance, the reflectivity and the scattering of light by the particulate layers - by research photometer or photomultiplier.