title: Reciprocating motion of a self-propelled object on a molecular layer.
abstract: The mode change of a simple autonomous motor depending on the nature of a monolayer on water is investigated. A camphor disk is floated on a molecular layer of N-stearoyl-p-nitroaniline (C(18)ANA), which gives a surface-pressure (π)-area per molecule (A) isotherm with a local maximum and a local minimum. The nature of the camphor motion changes depending on A, and in particular, reciprocating motion is observed at a lower A while cutting out its own trajectory of motion. The characteristic motion of a camphor disk depending on A is discussed in relation to the π-A isotherm of C(18)ANA and the influence of the molecular interaction between molecules on the driving force of motion.
authors.affiliation: Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Japan. nakatas@hiroshima-u.ac.jp
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakata
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Miyaji
authors.forename: Taisuke
authors.initials: T
authors.lastname: Sato
authors.forename: Miho
authors.initials: M
authors.lastname: Hoshikawa
authors.forename: Yumihiko S
authors.initials: YS
authors.lastname: Ikura
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Izumi