New types of complex motion of a simple camphor boat

We discuss the motion of a rectangular camphor boat, considering the position of a camphor pill in relation to the boat's stern as the control parameter. The boat moves because the pill releases surface active molecules that decrease the surface tension and support the motion. We introduce a ne...

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Bibliographic Details
Published inPhysical chemistry chemical physics : PCCP Vol. 25; no. 11; pp. 7794 - 784
Main Authors Löffler, Richard J.G, Roli ski, Tomasz, Kitahata, Hiroyuki, Koyano, Yuki, Górecki, Jerzy
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 15.03.2023
Subjects
Annan fysik
Camphor
Fysik
Natural Sciences
Naturvetenskap
Other Physics Topics
Physical Sciences
Surface tension
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Summary:We discuss the motion of a rectangular camphor boat, considering the position of a camphor pill in relation to the boat's stern as the control parameter. The boat moves because the pill releases surface active molecules that decrease the surface tension and support the motion. We introduce a new experimental system in which the boat rotates on a long arm around the axis located at the centre of a Petri dish; thus, the motion is restricted to a circle and can be studied under stationary conditions for a long time. The experiments confirmed two previously reported modes of motion: continuous motion when the pill was located at the boat edge and pulsating (intermittent) motion if it was close to the boat centre (Suematsu et al. , J. Phys. Chem. C , 2010, 114 (21), 9876-9882). For intermediate pill locations, we observed a new, unreported type of motion characterised by oscillating speed ( i.e. oscillating motion). Different modes of motion can be observed for the same pill location. The experimental results are qualitatively confirmed using a simple reaction-diffusion model of the boat evolution used in the above-mentioned paper. Experiments with rotating camphor boats revealed a new type of boat motion characterized by oscillating speed.
Bibliography:d
7 mm showing inversions of rotations (accelerated 4 times
https://doi.org/10.1039/d2cp05707g
8 mm showing pulsating motion (accelerated 5 times
cf.
Fig. 3), SI-oscillating-large-amp-L5-5 mm.mp4 - a fragment of movie from experiment for
Electronic supplementary information (ESI) available: SI-continuous-L2-2p5mm.mp4 - a fragment of movie from experiment for
2.5 mm showing the continuous motion
Fig. 2), SI-oscillating-small-amp-L5-3 mm.mp4 - a fragment of movie from experiment for
Fig. 4), and SI-inversion-L3-7 mm.mp4 - a fragment of movie from experiment for
5 mm showing the oscillating motion with a large amplitude, SI-pulsating-L5-8 mm-x5.mp4 - a fragment of movie from experiment for
3 mm showing the oscillating motion with a small amplitude
Fig. 5). See DOI
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ISSN:1463-9076
1463-9084
DOI:10.1039/d2cp05707g