Marangoni effects in aqueous polypropylene glycol foams.
The foam behavior of three polypropylene glycols covering the molecular weight range between 192 and 725 g/mol has been examined. Static and dynamic surface tension data, as well as bubble size distribution and retention time in the foam, were incorporated into a simple model of foam stability. The latter clearly indicates that surface tension differences between the plateau border and lamellar region adjacent to the bubble surface are the dominant factor in controlling foamability, causing liquid flow in the direction opposite to liquid drainage, a process termed the Marangoni effect.
Tan
Su Nee
SN
Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
Fornasiero
Daniel
D
Sedev
Rossen
R
Ralston
John
J