The time dependent relative pair velocity was computed as a function of time with equation 4 by using the experimental time dependent pH measurements (320 𝜇𝑚 electrode spacing) to calculate the hydroxyl ion concentration near the cathode. This concentration was used to subsequently calculate the pH dependent EO flow magnitude. The EHD flow magnitude was nearly constant with pH and the EO flow magnitude became increasingly negative (repulsive) with increasing pH due to the increasing rectified electric field magnitude (Figure ). Figure shows the time dependent particle pair velocities for each steady potential. The scaling model showed that particles will monotonically approach each other over time at a steady potential of -50 mV, consistent with the formation of colloidal crystals with no transient states at small steady potentials.