Thin adhesive oil films lead to anomalously stable mixtures of water in oil.

Autor: Nannette C; Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France.; Calyxia, 94380 Bonneuil-sur-Marne, France., Baudry J; Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France., Chen A; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA., Song Y; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA 02129, USA., Shglabow A; Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France., Bremond N; Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France., Démoulin D; Calyxia, 94380 Bonneuil-sur-Marne, France., Walters J; Calyxia, 94380 Bonneuil-sur-Marne, France., Weitz DA; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.; Department of Physics, Harvard University, Cambridge, MA 02138, USA.; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02215, USA., Bibette J; Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2024 Apr 12; Vol. 384 (6692), pp. 209-213. Date of Electronic Publication: 2024 Apr 11.
DOI: 10.1126/science.adj6728
Abstrakt: Oil and water can only be mixed by dispersing droplets of one fluid in the other. When two droplets approach one another, the thin film that separates them invariably becomes unstable, causing the droplets to coalesce. The only known way to avoid this instability is through addition of a third component, typically a surfactant, which stabilizes the thin film at its equilibrium thickness. We report the observation that a thin fluid film of oil separating two water droplets can lead to an adhesive interaction between the droplets. Moreover, this interaction prevents their coalescence over timescales of several weeks, without the use of any surfactant or solvent.
Databáze: MEDLINE
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