Newsletter - 2005/12 - Ausgabe 11

Characterization of liquid foams by the determination of surface rheological properties of surfactant solutions

The phenomenon of foaming is of particular interest in many different industrial branches. Producer of personal care products, fire extinguishing foams, flotation process froths, breweries, and more can be interested in the formation of particular stable or unstable foams. Despite the importance of foams in technological processes there is still a lack of as well simple as sound methods for foam characterization. Until today, the Ross-Miles Foam Height Test is a standard testing method, despite of the major drawback of being very time consuming. In this note we show that by determination of the surface rheological parameter E´ and E´´ (i.e. the elastic and viscous moduli) with the EDM/ODM module added to the DSA100, we quantify a critical factor for foamability and foam stability. The measurement takes place prior to foaming and allows optimization of formulations without time consuming in situ testing.

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Effect of Temperature on the Surface Energy of Solids

Most surface science work in the area of adhesion focuses on characterizing the adhesive (or ink or coating, as applicable) for surface tension properties. The data are then used, along with similar characterizations of a solid substrate’s surface energy properties, to provide direction as to what might be done to enhance adhesive/substrate compatibility and improve adhesion.

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