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Driven by the necessity to achieve a thorough comprehension of the bottom-upfabrication process of functional materials, this experimental studyinvestigates the pair-wise interactions or collisions between chemically activeSiO2-Pt Janus Colloids. These collisions are categorized based on the Januscolloids orientations before and after they make physical contact. In additionto the hydrodynamic interactions, the Janus colloids are also known to affecteach others chemical field, resulting in chemophoretic interactions, whichdepend on the degree of surface anisotropy in reactivity and solute-surfaceinteraction. These interactions lead to a noticeable decrease in particle speedand changes in orientation that correlate with the contact duration and yielddifferent collision types. Our findings reveal distinct configurations ofcontact during collisions, whose mechanisms and likelihood is found to bedependent primarily on the chemical interactions. Such estimates of collisionand their characterization in dilute suspensions shall have key impact indetermining the arrangement and time scales of dynamical structures andassemblies of denser suspensions, and potentially the functional materials ofthe future.

Pair-Interactions of Self-Propelled SiO2-Pt Janus Colloids: Chemically Mediated Interactions