Tuning static drop friction

Alexandre Laroche, Abhinav Naga, Chirag Hinduja, Azadeh Aghili Sharifi, Alexander Saal, Hyeonjin Kim, Nan Gao, Sanghyuk Wooh, Hans‐jürgen Butt, Rüdiger Berger, Doris Vollmer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The friction force opposing the onset of motion of a drop on a solid surface is typically considered to be a material property for a fixed drop volume on a given surface. However, here we show that even for a fixed drop volume, the static friction force can be tuned by over 30% by preshaping the drop. The static friction usually exceeds the kinetic friction that the drop experiences when moving in a steady state. Both forces converge when the drop is prestretched in the direction of motion or when the drop shows low contact angle hysteresis. In contrast to static friction, kinetic friction is independent of preshaping the drop, that is, the drop history. Kinetic friction forces reflect the material properties.
Original languageEnglish
Article numbere42
Number of pages8
JournalDroplet
Volume2
Issue number1
Early online date12 Jan 2023
DOIs
Publication statusPublished - 18 Jan 2023

Keywords

  • RESEARCH ARTICLE
  • RESEARCH ARTICLES

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