Micro flow device and method for generating a fluid with pH gradient

A micro flow device comprising:

• a first substrate, having a first flow path;
• a second substrate, having a second flow path, disposed corresponding to the first substrate;
• an ion exchange membrane, disposed between the first substrate and the second substrate for separating an electrolyte solution in the first flow path and the second flow path;
• and
• at least two electrode units, wherein each of the electrode units comprises a first electrode and a second electrode respectively disposed in the first flow path and disposed in the second flow path;
• wherein when the at least two electrode units are driven to electrolyze the electrolyte solution, the first electrodes are of the same charge type, the second electrodes are of the opposite charge type to the first electrodes, the ion exchange membrane retards the mixing and neutralization of an anode product and a cathode product generated by electrolyzing the electrolyte solution, and a first fluid and a second fluid are generated in each of the first flow path and the second flow path with pH gradient along a direction of the first flow path and the second flow path respectively.