Friction, free axes of rotation and entropy

Alexander Kazachkov, Victor Multanen, Viktor Danchuk, Mark Frenkel, Edward Bormashenko

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Friction forces acting on rotators may promote their alignment and therefore eliminate degrees of freedom in their movement. The alignment of rotators by friction force was shown by experiments performed with different spinners, demonstrating how friction generates negentropy in a system of rotators. A gas of rigid rotators influenced by friction force is considered. The orientational negentropy generated by a friction force was estimated with the Sackur-Tetrode equation. The minimal change in total entropy of a system of rotators, corresponding to their eventual alignment, decreases with temperature. The reported effect may be of primary importance for the phase equilibrium and motion of ubiquitous colloidal and granular systems.

Original languageEnglish
Article number123
Issue number3
StatePublished - 17 Mar 2017


  • Entropy
  • Free axis of rotation
  • Friction
  • Orientational negentropy
  • Rotators


Dive into the research topics of 'Friction, free axes of rotation and entropy'. Together they form a unique fingerprint.

Cite this