Drops of a suspension of individual single-walled carbon nanotubes in F68 Pluronic surfactant dry on glass substrates to form a “crust” at the free surface. The crust is extremely thin (∼ 100 nm) and consists of an entangled mesh of nanotubes and Pluronic. The convective flow associated with the drying preferentially assembles the nanotube-Pluronic micelles into a hexagonal arrangement, as revealed by birefringent patterns (see Figure and Cover).
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