Abstract:We show that colloidal suspensions that acquire a surface
charge
by capturing ions from the surrounding solution display unexpected
and remarkable phoretic behavior. Depending on suspension volume fraction,
a critical zeta potential ζ exists where the effective electrophoretic
mobility diverges, becoming virtually infinite. Beyond such critical
value, a ζ-range is identified where mobility reversal occurs,
i.e., the effective mobility becomes negative. This counterintuitive
behavior is due to the salt gradient… Show more
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