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Transient Reciprocating Motion of a Self-Propelled Object Controlled by a Molecular Layer of a N‑Stearoyl‑p‑nitroaniline: Dependence on the Temperature of an Aqueous Phase

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posted on 10.07.2014, 00:00 by Satoshi Nakata, Tomoaki Ueda, Tatsuya Miyaji, Yui Matsuda, Yukiteru Katsumoto, Hiroyuki Kitahata, Takafumi Shimoaka, Takeshi Hasegawa
The mode-bifurcation of a self-propelled system induced by the property of a N-stearoyl-p-nitroaniline (C18ANA) monolayer developed on an aqueous phase was studied. A camphor disk was placed on a C18ANA monolayer, which indicated a characteristic surface pressure–area (π–A) isotherm. A camphor disk transiently exhibited reciprocating motion at a higher surface density of C18ANA. 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–A curve for C18ANA depending on the temperature. The interaction between C18ANA 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 C18ANA monolayer.