Surface Assembly

Patterning colloids with microbubbles

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Science  15 Jan 2016:
Vol. 351, Issue 6270, pp. 237-238
DOI: 10.1126/science.351.6270.237-f

A laser-based method can create arbitrary patterns of nanoparticles and colloids on plasmonic substrates with photothermally generated microbubbles. Lin et al. generated microbubbles in colloidal suspensions at low laser powers, using a plasmonic surface (a quasi-continuous gold nano-island film) that had its resonance tuned to the laser wavelength of 532 nm. The microbubbles captured and immobilized particles through Marangoni convection around the bubble, surface tension, gas pressure, and substrate adhesion. They patterned polystyrene nanoparticles (∼60 nm) and beads (∼0.5 to 5 µm) as well as 6-nm cadmium selenide-zinc sulfide core-shell nanoparticles.

Nano Lett. 5, 10.1021/acs.nanolett.5b04524 (2015).

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