Molecular ligands stabilize colloidal nanoparticles in water and also tune their surface chemistry.  NMR is a standard chemical method that, when applied to molecularly-capped colloidal nanoparticles larger than about 5 nm, usually results in either in no signal (because the sample is too dilute) or aggregated particles at the bottom of the NMR tube. We report NMR results of ligands on gold nanoparticles, 1-25 nm diameters, concentrated 100x as usual without aggregation, and measure headgroup mobility and ligand density as a function of particle diameter.  Molecular dynamics simulations support the notion that ligands are more densely packed, but less ordered, on smaller nanoparticle surfaces.<br/>

Ligand density and conformation on gold nanoparticles inferred by NMR

2019 Spring National Meeting

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