"Two-Dimensional Self-Assembly of Latex Particles in Wetting Films on Patterned Polymer Surfaces" Yujie Sun and Gilbert C. Walker. Phys. Chem. B 106 pp 2217 - 2223; (Article) DOI: 10.1021/jp0143995

Description:

The grid pictured above was created by a novel drying process. Polystryrene nanoparticles were dynamically deposited into PDMS grooves that are as deep as the particle radius.
The squares of the grid are only a few microns across.
 

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