| 초록 |
Janus particles are compartmentalized colloids with two sides of different chemistry or polarity. They are unique among the nano/micro objects because they provide asymmetry and can thus impart drastically different chemical or physical properties and directionality within a single particle. As an application of Janus particles, a bubble propulsion model based on catalyzed decomposition of hydrogen peroxide and momentum change via O2 bubbles detaching from the catalytic surface is proposed to explain the autonomous motion of catalytic nanomotors. For the purpose, Pt-coated spherical polystyrene are fabricated by sputtering Pt on the hemisphere of colloidal particles. The propelling force closely depends upon the surface tension of the liquid as well as the bulk concentration of hydrogen peroxide. The characteristics and motion of Janus particles were examined and traced by OM and HR-SEM. Especially, the effects of structural parameters on the motion were systematically investigated. |
