In situ assessment of the contact angles of nanoparticles adsorbed at fluid interfaces by multiple angle of incidence ellipsometry Auteur(s): Stocco A., Su Ge, Nobili M., In M., Wang Dayang (Article) Publié: Soft Matter, vol. 10 p.6999 (2014) Texte intégral en Openaccess : Ref HAL: hal-01064084_v1 PMID 24910076 DOI: 10.1039/c4sm00482e WoS: 000341025700014 Exporter : BibTex | endNote 17 Citations Résumé: Here multiple angle of incidence ellipsometry was successfully applied to in situ assess the contact angle and surface coverage of gold nanoparticles as small as 18 nm, coated with stimuli-responsive polymers, at water-oil and water-air interfaces in the presence of NaCl and NaOH, respectively. The interfacial adsorption of the nanoparticles was found very slow and took days to reach a fairly low surface coverage. For water-oil interfaces, in-situ nanoparticle contact angles agree with the macroscopic equilibrium contact angles of planar gold surfaces with the same polymer coatings; whilst for water-air interfaces, significant differences have been observed. |