In an acid-base microchannel with added salt, particles can reverse their drift direction and focus into a band because zeta potential changes with pH; the paper derives the salt ranges and focusing locations.
If U switches di- rection from positive to negative as we move from left to right, we refer to it as focusing
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pH-Dependent Zeta Potential Induces Diffusiophoretic Focusing in an Acid-Base Reaction
In an acid-base microchannel with added salt, particles can reverse their drift direction and focus into a band because zeta potential changes with pH; the paper derives the salt ranges and focusing locations.