Robust beer foams

Figure 21.3. Typically, foams can be categorized as short-lived systems where film rupture is described as a spinodal decomposition (champagne foams), or long-lived systems in which energy barriers create an activation energy and film rupture is governed by a nucieation process (robust beer foams) (from ref. (7), reproduced with permission from lOP publishing limited...

It is also important to recognize that foams and emulsions are, in an absolute sense, thermodynamically unstable however, it is often possible to classify a particular system as relatively short-lived dynamically stabilized (ca. minutes) or one that can remain stable for very long periods (ca. days or years). A champagne foam is a classic example of the former, while robust beer foams and cosmetic creams fall into the latter category (see Figure 21.3). As already mentioned, this remarkable difference in a dispersion s lifetime is... 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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