The surface tells it all: relationship between volume and surface fraction of liquid dispersions
Forel
E
author
Rio
E
author
Schneider
M
author
Beguin
S
author
Weaire
D
author
Hutzler
S
author
Drenckhan
W
author
2016
The properties of liquid dispersions, such as foams or emulsions, depend strongly on the volume fraction phi of the continuous phase. Concentrating on the example of foams, we show experimentally and theoretically that phi may be related to the fraction phi(s) of the surface at a wall which is wetted by the continuous phase – given an expression for the interfacial energy or osmotic pressure of the bulk system. Since the surface fraction phi(s) can be readily determined from optical measurement and since there are good general approximations available for interfacial energy and osmotic pressure we thus arrive at an advantageous method of estimating phi. The same relationship between phi and phi(s) is also expected to provide a good approximation of the fraction of the bubble or drop surface which is wetted by the continuous phase. This is a parameter of great importance for the rheology and ageing of liquid dispersions.
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text
10.1039/c6sm01451h
Forel_etal2016
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Soft Matter
2016
continuing
periodical
academic journal
12
38
8025
8029
1744-683x