Materials Science

Patterned pockets for preparing particles

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Science  13 Mar 2015:
Vol. 347, Issue 6227, pp. 1214
DOI: 10.1126/science.347.6227.1214-c

The functional properties of multiphasic micro- and nanoparticles are critically dependent on their geometry and chemistry. Kobaku et al. developed a versatile platform for templating particles based on surface wetting. Films of silanized titanium dioxide were patterned using an ultraviolet light to give regions with high or low receding contact angles. When the templates were dip-coated into solutions containing polymers or particles, they would deposit only in the patterned areas. It was also possible to spin-coat or spray-coat the solution, and multiple deposition cycles made it possible to create particles with mixed or layered compositions. The particles are released from their templates through the use of a sacrificial interface layer, and the templates could be reused up to 20 times.

Appl. Mat Interf. 10.1021/am507964k (2015).

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