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Synchronization of self-propelled soft pendulums.

Satoshi Nakata1, Katsuhiko Kayahara, Masakazu Kuze

  • 1Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan. nakatas@hiroshima-u.ac.jp.

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Thin filaments on water exhibit self-propelled motion driven by surface tension changes. Their synchronized movements, like pendulum oscillations, depend on filament spacing, as shown by modeling and simulations.

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Area of Science:

  • Soft matter physics
  • Fluid dynamics
  • Surface chemistry

Background:

  • Thin filaments made from nitrocellulose-based adhesives were studied.
  • Filaments were partially submerged in a water chamber, with one end fixed.
  • Organic molecules released from filaments altered water surface tension.

Purpose of the Study:

  • To investigate the self-propelled motions of thin filaments on water.
  • To understand pendulum-type oscillations and synchronization behaviors.
  • To explore the influence of filament spacing on motion dynamics.

Main Methods:

  • Observation of single and dual filament dynamics in a water chamber.
  • Analysis of pendulum-type oscillations and synchronization patterns (in-phase, out-of-phase).
  • Mathematical modeling and numerical simulations of filament motion and surface active molecule dynamics.

Main Results:

  • Single filaments displayed pendulum-type oscillations.
  • Two parallel filaments exhibited in-phase, out-of-phase, or unsynchronized motion.
  • Observed motion classes were dependent on the distance between filament anchor points.

Conclusions:

  • Surface tension gradients caused by filament-released molecules drive self-propelled motion.
  • Filament spacing is a critical factor in determining synchronization behavior.
  • Mathematical models successfully reproduced observed soft self-propelled matter dynamics.