| Autor: |
Rowan, S. M., Newton, M. I., Driewer, F. W., McHale, G. |
| Zdroj: |
The Journal of Physical Chemistry - Part B; August 2000, Vol. 104 Issue: 34 p8217-8220, 4p |
| Abstrakt: |
This work reports data showing the evolution of contact angle with time for mixtures of water and 1-propanol at room temperature on poly(methyl methacrylate) (PMMA). The composition range investigated spans the azeotropic composition, thus encompassing systems containing excess water and excess 1-propanol. A discontinuity in the contact angle behavior is observed and it is suggested that this enables the identification of the azeotropic composition as 0.39 mole fraction of 1-propanol. This suggestion is supported by boiling point measurements made at around 20 mmHg. The discontinuity is associated with the presence of an instability, which causes a distortion around the droplet perimeter. It is suggested that the distortion is caused by competing effects of local surface tension maxima and minima. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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