Experimental evidence for the minimum of surface tension with temperature at aqueous alcohol solution/air interfaces
The equilibrium surface tension of an aqueous solution of fatty alcohol/air goes through a minimum when the temperature is raised. As a consequence, the surface tension gradient originated by a given temperature difference between two regions of a free surface has to be reversed when the temperature...
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| Published in | Journal of colloid and interface science Vol. 98; no. 1; pp. 261 - 263 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
01.01.1984
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| Online Access | Get full text |
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| Summary: | The equilibrium surface tension of an aqueous solution of fatty alcohol/air goes through a minimum when the temperature is raised. As a consequence, the surface tension gradient originated by a given temperature difference between two regions of a free surface has to be reversed when the temperature increases. Simple devices are built-up to visualize this effect. A defined local region of the free surface is heated by a metallic plate near the interface. Talc particles on the surface show surface motion using a profile projector. The expected inversion of the direction of the talc particles with increasing temperature is often observed. |
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| ISSN: | 0021-9797 1095-7103 |
| DOI: | 10.1016/0021-9797(84)90503-4 |