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The adhesion of flowing particles and biological cells over fixed collectingsurfaces is vitally important in diverse situations and potentially controlledby small-scale surface heterogeneity on the particle. Differences in thebehavior of patchy particles (flowing over uniform collectors) relative to thereverse case of uniform particles (flowing over patchy collectors) arequantified. Because a particle rotates more slowly than it translates in theshear field near a collecting surface, the effective interaction time of apatch on a particle is larger than that of a patch on the collector, suggestingdistinct particle capture tendencies in each case. This paper presents a newcomputational approach to simulate the near-surface motion (rotation andtranslation) of particles having nanoscale surface heterogeneities flowing overuniform collectors. Small amounts of ~10 nm cationic patches randomlydistributed on a net-negative particle surface produced spatially varying DLVOinteractions that were computed via the Grid Surface Integration (GSI)technique and then combined with hydrodynamic forces in a mobility tensorformulation. Statistical analysis of simulated trajectories revealed fewerextrema in the fluctuating particle-collector separation of heterogeneousparticles, compared with the reverse system geometry of uniform particlesflowing past a heterogeneous fixed surface. Additionally, the patchy particleswere captured to a lesser extent on uniform surfaces compared with the case ofuniform particles flowing above patchy collectors. Such behavior was dependenton ionic strength, with the greatest differences obtained near a Debye lengthof $\kappa^{-1} = 4$ nm for the $2a = 500$ nm simulated particles.

A computational study of chemically heterogeneous particles: patchy vs. uniform particles in shear flow