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Buckling in armored droplets

Sicard, F; Striolo, A; (2017) Buckling in armored droplets. Nanoscale , 9 (25) pp. 8567-8572. 10.1039/c7nr01911d. Green open access

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Abstract

The buckling mechanism in droplets stabilized by solid particles (armored droplets) is tackled at a mesoscopic level using dissipative particle dynamics simulations. We consider one spherical water droplet in a decane solvent coated with nanoparticle monolayers of two different types: Janus (particles whose surface shows two regions with different wetting properties) and homogeneous. The chosen particles yield comparable initial three-phase contact angles, selected to maximize the adsorption energy at the interface. We study the interplay between the evolution of droplet shape, layering of the particles, and their distribution at the interface when the volume of the droplets is reduced. We show that Janus particles affect strongly the shape of the droplet with the formation of a crater-like depression. This evolution is actively controlled by a close-packed particle monolayer at the curved interface. In contrast, homogeneous particles follow passively the volume reduction of the droplet, whose shape does not deviate too much from spherical, even when a nanoparticle monolayer/bilayer transition is detected at the interface. We discuss how these buckled armored droplets might be of relevance in various applications including potential drug delivery systems and biomimetic design of functional surfaces.

Type: Article
Title: Buckling in armored droplets
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c7nr01911d
Publisher version: http://dx.doi.org/10.1039/c7nr01911d
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Materials Science, Physics, WATER/OIL INTERFACE, MESOSCOPIC SIMULATION, SESSILE DROPS, NANOPARTICLES, OIL, DESICCATION, EMULSIONS, INSIGHTS, SURFACE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1561126
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