The article by Ananth P. Kaushik and Paulette Clancy on page 523 deals with the preference of superlattice symmetry of ligand-capped nanocrystals, i.e., BCC or FCC, and how the choice of the solvent affects this preference. The image shows a single ligand-capped PbSe nanocrystal above a sea of other nanocrystals drowning in an ocean of toluene (solvent). The preference of the superlattice symmetry depends on the length of the capping ligands as well as the choice of the solvent (hexane vs. toluene). In general, for a given size of the nanocrystal, longer ligands favor BCC symmetry and shorter ligands prefer FCC symmetry.
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