Drying Droplets: A Window into the Behavior of Nanorods at Interfaces

Authors


  • This work was supported by the U.S. Department of Energy, Office of Basic Energy Science, the Army Research laboratory through the MURI program, the NSF supported MRSEC at the University of Massachusetts Amherst, and an NSF CAREER Award. Argonne National Laboratory’s work was supported by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under contract DE-AC02-06CH11357.

Abstract

original image

CdSe nanorods were found to assemble at an oil–water interface (on the surface of water droplets) as shown by small-angle neutron scattering. When nanorod-covered droplets were dried on a substrate, the decrease in interfacial area produced an in-plane compression, leading to various two-dimensional packing motifs for the nanorods across the droplet surface, from a low-density random packing to a more dense smectic ordering to a crystalline phase (see image).

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