SICC course: How to improve and evaluate the cosmetic stability - LS Instruments DWS and X-Rite Color Spectrophotometry presentations

To these days, rheological measurements on emulsions, liquids, polymers or particle systems are mainly destructive analyses, performed with mechanical rheometers which often do not allow the effective determination of the properties of the materials; this is due to superficial evaporation and crosslinking phenomena occurring at the plate-sample interface. Other rheological investigation methodologies such as video tracking or DLS technologies do not allow the analysis of concentrated samples due to multi light scattering phenomena: in the latter the samples often require dilution with consequent loss or alteration of the chemical-physical properties of the analyzed material.

The DWS RheoLab technology developed by LS Instruments through a collaboration with ETH Zurich and the University of Friborg, allows to overcome the traditional limitations of rheological analysis allowing highly reliable and reproducible measurements of viscosity, elastic and viscous modulus and particle sizes without no application of external forces, no  contact with the sample and with minimal quantities of undiluted material. The instrument allows access to a wide range of viscoelastic materials operating in a wide range of frequencies and allowing the study of the microstructural properties of many materials and their chemical-physical performance.

During our presentation some scientific articles will be discussed in which the DWS technology is used in the cosmetic field for monitoring the stability of emulsions, in the study of phenomena such as coalescence and foam ripening and in the analysis of gelling and cross-linking phenomena of protein and polymeric systems.