Work

Responsive Janus emulsion as an unconventional indicator for a traditional argentometric titration

Year: 2025

Type: article

Abstract: Argentometric titrations are traditional and widely recognized methods for detecting halide ions. However, their practical application is often constrained by challenges such as pH control and reliance on specific indicators. In this study, we introduce a novel optical indicator for argentometric titration, based on previously reported Janus droplet systems and employing cetyltrimethylammonium bromide (CTAB) and Zonyl as surfactants. Furthermore, Janus droplets were utilized to explore the impact of various cations on the efficiency of the CTAB surfactant, revealing that contact angle values are influenced by the cations' positions within the Hofmeister series. • Impact of Ions on Droplets: Morphological transitions in complex droplets are driven by ion-specific interactions. • Halide Ion Effects: Halide ions, removed via argentometric precipitation, restore droplet contact angles. • Innovative Optical Indicator: A novel argentometric titration uses droplet morphology for real-time halide ion detection.

Source: Colloids and Interface Science Communications

DOI: 10.1016/j.colcom.2025.100827

Authors: Teodora Despotovski, Slavica Mitrović, Nikola Knežević, Milan Vraneš, Lidija Petrović, Marko Pavlović

Institutions: University of Novi Sad, BioSense Institute, Harvard University

Language: English

Topic: Surfactants and Colloidal Systems

Subfield: Organic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,830

Funders: Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja, HORIZON EUROPE Framework Programme, Horizon 2020