Negatively charged colloidal nanospheres (left) and DNA (right) self assemble along contours of like-charged SiO2 domains patterned in a fluidic nanoslit. The attractive interactions driving this static self-assembly process manifest in solution at low ionic strength and slit depths of around 100 nm. Scale bar represents 10 µm.
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Krishnan et al. (2008) studied this question.
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