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Illuminating the Impact of Nanoparticle Size and Surface Chemistry on Interfacial Position

In
this manuscript we begin by preparing bulk Pickering emulsions of water:octanol
at varying aqueous pH values, using ionizable carboxyl polystyrene
nanoparticles of 320 nm and 810 nm diameter. Remarkably we observe two emulsion
phase inversions, one resulting from an increase in pH and a second due to an
increase in particle size. To illuminate the mechanism of the macroscopic phase
inversion, we turn to the super resolution microscopy technique interface Point Accumulation for Imaging and
Nanoscale Topography (iPAINT) to measure in-situ the contact angles of
single carboxyl polystyrene particles at the water:octanol interface. Importantly,
we identify a significant decrease in contact angle over the increase of pH and
particle diameter, respectively. Additionally, the non-negligible dependence of
contact angle on particle size was shown to hold regardless of particle surface
chemistry.