Herein we report the migrational behaviour and spatial distribution of calf thymus DNA in a gradient of different physiologically relevant monovalent and divalent cations under two different conditions - (i) microfluidic and (ii) evaporating droplets. Amplified phoresis toward high concentrations of Mg and Ca compared to other ions and non-uniform DNA coating in a gradient of ions were observed. This process, which was governed by the effective charge and diffusion coefficient of the DNA-metal ion complex, can have potential applications in nucleic acid-based spatiotemporal surface patterning, biosensors, and dynamic biocolloidal assembly and transport.
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