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Using video-microscopy imaging we demonstrate the existence of a short-rangedequilibrium attraction between heavy silica colloids diffusing on soft surfacesof cross-linked polymer gels. The inter-colloid potential can be tuned bychanging the gel stiffness or by coating the colloids with a polymer layer. Onsufficiently soft substrates, the interaction induced by the polymer matrixleads to large-scale colloidal aggregation. We correlate the in-planeinteraction with a colloid-surface attraction.

Interactions between colloids induced by a soft cross-linked polymer substrate