In this study, particles travel through the tapered channels towards the outlet, where the discontinuous clogging process begins. Clogs are formed by sieving at the outlet where w c ≈ d p (see Video S4 in SI). Clogs can be formed by bridging in positions where w c > d p . This is readily observed up to w c ≈ 4d p (see Video S5 in SI). In wider regions, where w c /d p > 4, clogging by bridging becomes less likely. Table quantifies the flux of particles per channel for the entire range of φ and ∆P investigated. Each flow condition is described by both n 0 and n 1/2 , where n 0 indicates the number of particles per time flowing through a single channel at the beginning of the flow test. Over time, as flowrate Q decays, so does the particle flux: n 1/2 estimates particle flux at the midpoint of the flow test, given previously reported measurements of Q(t) . At the largest values of φ and ∆P, n 0 exceeds 60 particles per second. But after half of the flow test has elapsed, the flux drops to n 1/2 = 11 at maximum. Table Comparison between particle adhesion in pristine flow tests and conditions where adhesive interactions are chemically induced. The percentage of nonclogs (α) is an order of magnitude higher when adhesive interactions are induced, compared to pristine controls. The percentage of particles that reach the microchannels (β ) also reduces in the presence of chemically-induced particle adhesion and deposition. Here, φ = 0.05% in all cases. Given the low particle flux estimates, we investigate the possibility that particle aggregation or adhesion contribute to clogging in regions of the device where w c /d p > 4. In one flow test, we induce aggregation by suspending the particles in a 1 M NaCl solution. The presence of salt in suspension is known to induce aggregation and clogging in microfluidic colloidal suspension flows . The ions screens away the electrostatic repulsion between particles and facilitates aggregation due to attractive van der Waals interactions. This can be seen readily in the inlet region as soon as the flow test begins (see Video S1 in SI). This treatment facilitates adhesion of the particles and aggregates to the channel walls.