Apparatus for accelerating uniform reaction of reactants with reactants on porous substrate, system containing the apparatus, and coater

A system for labeling a to-be-reacted substance rapidly, the system including:

• an equipment for enabling and accelerating uniform reaction between the to-be-reacted substance contained in a porous substrate and a reactant, the equipment comprising:
• a machine body having a draining bottom plate on which the porous substrate can be placed;
• and
• a coating head provided above the machine body and can be moved horizontally along the porous substrate while maintaining a predetermined height, and the coating head has one or more slits, wherein each slit has a direct injection opening on the coating head;
• wherein liquid can be directly injected or filled into the slit through the direct injection opening from the outside of the coating head, and the liquid can be distributed in the slit by capillary, and the liquid can be discharged through the slit from output opening at a bottom of the coating head to the porous substrate by gravity and capillary without additional driving power;
• wherein the coating head is configured without external pipeline for feeding coating liquid;
• and
• an optical image capture and analysis module.