Technology

Microrheologic analysis to evaluate ageing and...

 Rheolaser-lab is an instrument that allows a microrheologic analysis. Microrheology enables the measurement of the evolution of the viscosity and elasticity, in bulk. The measurement is performed at rest, as no mechanical stress is applied to the sample (unlike the Kinexus Rotational Rheometer). This technique allows monitoring of sample evolution, such as gelation, rheologic ageing, stability, but also drying of coatings. The principle of measurement is MS-Diffusing Wave Spectroscopy namely the measurement of particles mobility in opaque media. It is possible to quantify and compare the macroscopic viscosity of sample at zero-shear, to study the physic stability, to determine gel point. In pharmaceutical field, the Rheolaser permits to control gel properties of eye-drops, to characterize the delivery rate of polymer-based drugs; moreover, it can be used in food industry for monitoring gelation of yoghurts versus time, temperature or pH, for characterization the texture of salad dressing, creams, mayonnaise, etc. Cosmetic companies are interested to these analysis because they allows to determine ideal concentration of softeners to reduce packaging size, to control the texture of cosmetic creams or toothpastes and to analyze the rheology and stability of shampoos.