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Tisserand C.,10 Impasse Borde Basse | Fleury M.,10 Impasse Borde Basse | Brunel L.,10 Impasse Borde Basse | Bru P.,10 Impasse Borde Basse | Meunier G.,10 Impasse Borde Basse
JCT CoatingsTech | Year: 2012

Viscoelastic behavior drives end-use properties of soft matter such as the spreadability, flowability, shape stability, and physical stability. This article deals with a new domain of rheology, called microrheology, for the measurement of the viscosity and elasticity of materials such as suspensions, gels, and emulsions used in different industries like cosmetic, pharmaceutical, food, and paints. The device presented here enables the measurement of the viscoelastic behavior at rest as a result of multi-speckle diffusing wave spectroscopy. Several application examples are presented, such as real time monitoring of gelatin, shape stability analysis of toothpaste, the effect of polymer addition in an emulsion, and paint stability. The rheological properties, particularly at the microscopic scale, need to be characterized for soft matter before being applied as a rubber, layer, thin film, or coating.

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