The role of capping ligands on nanoparticles on their assembly has been extensively studied by many research groups. In the studies, x-ray scattering method has been a key technique to visualize the very details of the assembled structure including the orientation of particles in the superlattice and precise measurement of gap distance and packing fraction, thereby enabling energy calculation. This talk will briefly review small angle x-ray scattering (SAXS) and small angle neutron scattering (SANS) methods that we have applied for PbS nanoparticles capped with oleic acid and gold nanoparticles stabilized with CTAB. We will show how SANS measurements help to determine the degree of solvation of the oleic acids on PbS nanoparticles in a mixed solution of good and poor solvents that are toluene and alcohol, respectively. In addition, our recent result on complete 3D reciprocal space mapping of a mesocrystal will be discussed, which reveals defects in the crystals.

Understanding the role of soft ligands on nanoparticle assembly using small angle x-ray and neutron scattering techniques

2019 Spring National Meeting

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