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| Titel: |
FOAM BEHAVIOR IN PARTIALLY MISCIBLE BINARY SYSTEMS |
| Auteur: |
Ross, Sydney Townsend, David F. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 11 (1981) nr. 6 pagina's 347-353 |
| Jaar: |
1981-09-01 |
| Inhoud: |
A number of physical properties of the binary system ethylene glycol and ethyl salicylate have been measured recently. Thus measured values of surface tensions and vapor pressures as functions of composition and temperature are available, and from these may be calculated the Gibbs surface excesses of ethyl salicylate in solutions represented in the phase diagram by the one-phase area. The results of these calculations can be expressed as a series of cosorption contours superimposed on the phase diagram, showing maximum surface activity at a point (epicenter) on the co-existence curve. The epicenter would coincide with the consolute point only when the surface tensions of the two pure liquid components are equal: usually they are not equal, so that the epicenter of the contours is displaced on the co-existence curve toward the component of higher surface tension. This work reports the foam stabilities of solutions for which Gibbs surface excess concentrations are known. The foam stability contours (isaphroics) in general follow the cosorption contours, which in turn are related to the Gibbs elasticity. These results therefore demonstrate that the stability of evanescent foams is directly related to the Gibbs elasticity of the liquid surface. The more stable foams of solutions of compositions near that of the epicenter are inhibited by a slight alteration of total composition that will induce phase separation of a dispersed conjugate solution. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 7 gevonden artikelen
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