Self-motion of a camphoric acid boat as a function of pH of aqueous solutions

The mechanism of the self-motion of a camphoric acid boat depending on pH of aqueous solutions was investigated. The self-motion changed depending on pH of the aqueous phase (no motion (pH >10), intermittent motion (pH 6–10), and motion with a constant velocity (pH <6)). The period of intermittence increased with pH. The surface tension in the camphoric acid aqueous solutions with different pH were measured by means of the maximum bubble...