Spontaneous motion of an elliptic camphor particle.

Physical review. E, Statistical, nonlinear, and soft matter physics (2013-02-16)
Hiroyuki Kitahata, Keita Iida, Masaharu Nagayama
ABSTRACT

The coupling between deformation and motion in a self-propelled system has attracted broader interest. In the present study, we consider an elliptic camphor particle for investigating the effect of particle shape on spontaneous motion. It is concluded that the symmetric spatial distribution of camphor molecules at the water surface becomes unstable first in the direction of a short axis, which induces the camphor disk motion in this direction. Experimental results also support the theoretical analysis. From the present results, we suggest that when an elliptic particle supplies surface-active molecules to the water surface, the particle can exhibit translational motion only in the short-axis direction.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Camphor, 96%
Sigma-Aldrich
(1R)-(+)-Camphor, 98%
Sigma-Aldrich
(±)-Camphor, purum, synthetic, ≥95.0% (GC)
Supelco
D-Camphor, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
(±)-Camphor, meets analytical specification of Ph. Eur., BP, ≥95% (GC), racemic
Sigma-Aldrich
(1S)-(−)-Camphor, 99%
Sigma-Aldrich
D-Camphor, ≥97%, FG
Supelco
(−)-Camphor, analytical standard
Sigma-Aldrich
(±)-Camphor, ≥95.5%
Camphor (racemic), European Pharmacopoeia (EP) Reference Standard
Camphor (dl), primary reference standard
Sigma-Aldrich
(1S)-(−)-Camphor, 95%