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The Dynamic Surface Tension of Water
Ines M Hauner1,2, Antoine Deblais3, James K Beattie4
1van der Waals-Zeeman Institute, University of Amsterdam , 1098XH Amsterdam, The Netherlands.
The Journal of Physical Chemistry Letters
|March 17, 2017
Summary
The surface tension of freshly formed water surfaces is higher than equilibrium levels, revealing a dynamic process on a millisecond timescale. This finding challenges conventional understanding of water
Area of Science:
- Physical Chemistry
- Surface Science
- Fluid Dynamics
Background:
- Water's surface tension is crucial for biological and industrial applications, typically attributed to hydrogen bonding and dipolar interactions.
- Equilibrium surface tension of water is approximately 72 mN m⁻¹, significantly higher than nonpolar liquids.
Purpose of the Study:
- To investigate the dynamic surface tension of freshly created water surfaces.
- To understand the relaxation process and underlying mechanisms of dynamic surface tension in water.
Main Methods:
- Studying the formation dynamics of water drops.
- Measuring surface tension during the initial milliseconds of surface creation.
- Experimentally probing the influence of pH on dynamic surface tension.
Main Results:
- A freshly created water surface exhibits a higher surface tension (∼90 mN m⁻¹) compared to equilibrium conditions (∼72 mN m⁻¹).
- A relaxation process with a time scale of approximately 1 ms was observed.
- Dynamic surface tension was largely unaffected by changes in pH.
Conclusions:
- Water's surface tension is not static and exhibits dynamic behavior on short timescales.
- The observed dynamic surface tension and its relaxation are not primarily driven by pH-dependent adsorption or conventional hydrogen bonding/dipole orientation effects.
- Further research is needed to elucidate the precise mechanisms governing dynamic surface tension in water.
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