The stability of foams was determined in two-phase regions containing an isotropic hydrocarbon solution and a lamellar liquid crystal. The lamellar liquid crystal showed surface activity with regard to the hydrocarbon solution. This was interpreted as due to the higher frequency of methyl groups at the surface of the liquid-crystalline state compared to the liquid state. The weaker intermolecular forces from the methyl groups were assumed to result in a lower surface tension of the liquid crystal in comparison to the liquid. This hypothesis was tested by the use of a low surface tension hydrocarbon, isooctane. No foam stability was formed in this medium, supporting the claim of the methyl groups as the surface-active element. © 1986, American Chemical Society. All rights reserved.
S. Friberg et al., "Stability Of Hydrophobic Foams," Langmuir, vol. 2, no. 5, pp. 659 - 664, American Chemical Society, Jan 1986.
The definitive version is available at https://doi.org/10.1021/la00071a024
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01 Jan 1986