Effect of Ligands on the Structure and Mechanical Properties of Three-Dimensional Nanoparticles Superlattices

Extensive research has been conducted on the self-organization of uniform nanoparticles, leading to the formation of various types of periodic structures. Numerous instances of both single and multicomponent periodic assemblies have been successfully demonstrated. It has been established that the self-assembly process of nanoparticles is highly intricate, involving a wide range of attractive and repulsive interactions between particles and their ligands.<br/>In this study, we will explore the influence of nanoparticle purification, ligand solvation, and the type of ligands on the self-assembly of nanoparticles and their impact on the structure and properties of the resulting structures. Furthermore, we will discuss the effect of size distribution on the structure of periodic superlattices.<br/>We will present combined quasi-hydrostatic high-pressure small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD) studies on faceted 3D supercrystals self-assembled from colloidal nanoparticles. To investigate the overall mechanical characteristics of the assembled structures, we employed the diamond anvil cell technique, allowing us to examine the contributions of solvated ligands and inorganic ligands. Additionally, we will discuss the role of ligand solvation in the mechanical properties of periodic structures, as well as the structural transformations that occur upon compression for supercrystals obtained using different nonsolvents and ligands.