Scientists revise the 60-year-old definition of surface tension on solids

February 27, 2012

Researchers of VTT Technical Research Centre of Finland have shown that surface tension on a solid material is unconnected to the energy required to create a new surface. Consequently, surface tension on a solid does not exist in its conventional meaning.

It is generally believed that an excess on a solid material exists, in similar manner to that on a liquid. This tension is described by the Shuttleworth equation, which was presented more than 60 years ago and is considered a fundamental equation of surface thermodynamics. It is believed to provide the connection between surface tension and .

Three years ago, VTT researchers Lasse Makkonen and Kari Kolari, together with British scientist David Bottomley, revealed in the journal that the Shuttleworth equation is incompatible with the thermodynamic theory. This was hard to accept by many and provoked a lively discussion in the scientific literature.

Now Lasse Makkonen has shown mathematically that the disputed equation reduces to the definition of mechanical surface stress and has no connection with the energy of creating a new, unstrained surface. Consequently, the excess surface tension suggested by the Shuttleworth equation does not exist. The existence and nature of surface tension on a solid must therefore be sought by molecular dynamics at the only.

This new finding by Makkonen was published in Scripta Materialia this week. The research was funded by the Academy of Finland.

Explore further: Baby beetles inspire researchers to build 'mini boat' powered by surface tension (Video)

More information: Link to the publication:

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1 / 5 (1) Feb 27, 2012
but i thought the science was settled ;)

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