Bubble micro-pump and two-way fluid-driving device, particle-sorting device, fluid-mixing device, ring-shaped fluid-mixing device and compound-type fluid-mixing device using the same

A bubble micro-pump, comprising:

• a first component having a flow path, wherein the flow path has at least a first area and a second area;
• a second component disposed above the first component, wherein the second component has a first roughness surface and a second roughness surface, the first roughness surface opposite the first area has a first roughness factor, the second roughness surface opposite the second area has a second roughness factor, and the first roughness factor is substantially greater than the second roughness factor;
• and
• a bubble-generating unit disposed on the first component and used for generating bubbles in the first area and the second area when a fluid fills the vacancy between the first component and the second component;
• wherein due to the difference between the first roughness factor and the second roughness factor, when the bubbles generated by the bubble-generating unit start to vanish, the backfilling velocity of the fluid in the first area is greater than the backfilling velocity of the fluid in the second area, such that the fluid is driven to flow.