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We study the behavior of negatively charged colloids with two positivelycharged polar caps close to a planar patterned surface. The competition betweenthe different anisotropic components of the particle-particle interactionpatterns is able by itself to give rise to a rich assembly scenario: colloidswith charged surface patterns form different crystalline domains when adsorbedto a homogeneously charged substrate. Here we consider substrates composed ofalternating (negative/neutral, positive/neutral and positive/negative) parallelstripes and, by means of Monte Carlo simulations, we investigate the orderingof the colloids on changing the number of the stripes. We show that theadditional competition between the two different lengths scales characterizingthe system ($i.e.,$ the particle interaction range and the size of the stripes)gives rise to a plethora of distinct particle arrangements, where somewell-defined trends can be observed. By accurately tuning the substrate chargedmotif it is possible to, $e. g.,$ promote specific particles arrangements,disfavor crystalline domains or induce the formation of extended, openclusters.

Tuning the order of colloidal monolayers: assembly of heterogeneously charged colloids close to a patterned substrate