Tuning Electrostatic Interactions of Colloidal Particles at Oil-Water Interfaces with Organic Salts
Metadata only
Date
2023-09-22Type
- Journal Article
Abstract
Monolayers of colloidal particles at oil-water interfaces readily crystallize owing to electrostatic repulsion, which is often mediated through the oil. However, little attempts exist to control it using oil-soluble electrolytes. We probe the interactions among charged hydrophobic microspheres confined at a water-hexadecane interface and show that repulsion can be continuously tuned over orders of magnitude upon introducing nanomolar amounts of an organic salt into the oil. Our results are compatible with an associative discharging mechanism of surface groups at the particle-oil interface, similar to the charge regulation observed for charged colloids in nonpolar solvents. Show more
Publication status
publishedExternal links
Journal / series
Physical Review LettersVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
09455 - Isa, Lucio / Isa, Lucio
Funding
812780 - Active Matter: From Fundamental Science to Technological Applications (EC)
888076 - Photo-controlled two-dimensional soft materials from microgel particles at liquid interfaces (EC)
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