Transient
Reciprocating Motion of a Self-Propelled
Object Controlled by a Molecular Layer of a <i>N</i>‑Stearoyl‑<i>p</i>‑nitroaniline: Dependence on the Temperature of
an Aqueous Phase
- Publication date
- Publisher
Abstract
The mode-bifurcation of a self-propelled
system induced by the
property of a <i>N</i>-stearoyl-<i>p</i>-nitroaniline
(C<sub>18</sub>ANA) monolayer developed on an aqueous phase was studied.
A camphor disk was placed on a C<sub>18</sub>ANA monolayer, which
indicated a characteristic surface pressure–area (π–<i>A</i>) isotherm. A camphor disk transiently exhibited reciprocating
motion at a higher surface density of C<sub>18</sub>ANA. The amplitude
of the reciprocating motion increased with an increase in the temperature
of the aqueous phase below 290 K, but reciprocating motion varied
to irregular motion over 290 K. The temperature-dependent reciprocating
motion is discussed in terms of the π–<i>A</i> curve for C<sub>18</sub>ANA depending on the temperature. The interaction
between C<sub>18</sub>ANA molecules was measured by Fourier transform
IR spectrometry and Brewster-angle microscopy. As an extension of
the study, the trajectory of reciprocating motion could be determined
by writing with a camphor pen on the C<sub>18</sub>ANA monolayer