253. A simple liquid state 1H NMR measurement to directly determine the surface hydroxyl density of porous silica

Callum Penrose, Petr Steiner, Lynn F Gladden, Andrew Sederman, Andrew York, Marian Bentley and Michael Mantle; Chemical Communications; (2021); DOI: 10.1039/D1CC03959H (open access)

Silica is widely used in industrial applications and its performance is partially decided by its surface hydroxyl density αOH. Here we report a quick, simple liquid 1H NMR method to determine αOH using a benchtop 1H NMR spectrometer. The results show excellent agreement with the literature with an αOH range from 4.16 to 6.56 OH/nm2.