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Micromotor
Micromotors are very small particles (measured in microns) that can move themselves. These micromotors actually propel themselves in a specific direction autonomously when placed in a chemical solution. A set of oxidation-reduction reactions produce a stream of bubbles that then propels these micromotors through the chemical media. Spherical micromotors are called Janus spheres, because they are composed of two different materials, like the two-faced Roman god of change Janus.
Micrometers may have applications in medicine since they have been shown to be able to deliver materials to living cells within an organism. They also have been shown to be effective in degrading certain chemical and biological warfare agents.
== Morphology and Propulsion Mechanism ==
Janus sphere micromotors usually consist of a titanium dioxide surface layer and a strong reducing agent inner layer. The interaction of the two layer under irradiation of UV light produces bubbles as a result of a reduction reaction. Micromotors usually have a size of about 30μm with a small 2μm opening on the outer layer. This leads to the exposure of the inner core, which is typically the fuel source for the propulsion mechanism. The diameter of the hole controls the rate and speed of the reaction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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