  Deposition of particles while flowing past constrictions is a ubiquitous
phenomenon observed in diverse systems. Some common examples are jamming of
salt crystals near the orifice of saltshakers, clogging of filter systems,
gridlock in vehicular traffic etc. Our work investigates the deposition events
of colloidal microspheres flowing over microstructured barriers in microfluidic
devices. The interplay of DLVO, contact and hydrodynamic forces in facilitating
rapid deposition of microspheres is discussed. Noticeably, a decrease in the
electrostatic repulsion among microspheres leads to linear chain formations,
whereas an increase in roughness results in rapid deposition.
