Tunable Self-Emulsification Via Viscoelastic Control of Marangoni-Driven Interfacial Instabilities.

ABSTRACT: Interfacial instabilities in multicomponent fluidic systems are widespread in nature and in industrial processes, yet controlling their dynamics remains a challenge. Here, a strategy is presented to actively tune Marangoni-driven self-emulsification at liquid-liquid interfaces by harnessing fluid viscoelasticity. When a water-alcohol droplet spreads on an oil bath, a radial surface tension gradient induced by selective alcohol evaporation drives an interfacial instability, leading to the spontaneous formation of a dense 2D array of "daughter" droplets. It is demonstrated that introducing trace amounts of high-molecular-weight polymers, which introduces viscoelasticity, provides a robust means of controlling this process. Increasing viscoelasticity systematically suppresses the instability,

SUBMITTER: Haessig C 

PROVIDER: S-EPMC12790379 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature