ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Giakoumatos_Aloi_Voets_Illuminating the impact of nanoparticle size and surface chemistry on interfacial position.pdf (677.86 kB)

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

preprint
submitted on 19.02.2020, 17:02 and posted on 20.02.2020, 10:31 by Emma Giakoumatos, Antonio Aloi, Ilja Voets
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.

History

Email Address of Submitting Author

I.K.Voets@tue.nl

Institution

Eindhoven University of Technology

Country

The Netherlands

ORCID For Submitting Author

0000-0002-7860-2082

Declaration of Conflict of Interest

No conflict of interest.

Exports