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Van der Waals Emulsions: Emulsions Stabilized by Surface‐Inactive, Hydrophilic Particles via van der Waals Attraction
Author(s) -
Marina Paula Facal,
Cheng Chongling,
Sedev Rossen,
Stocco Antonio,
Binks Bernard P.,
Wang Dayang
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201805410
Subject(s) - van der waals force , hamaker constant , emulsion , particle (ecology) , oil droplet , dlvo theory , chemical physics , chemistry , chemical engineering , monolayer , van der waals strain , attraction , nanotechnology , materials science , colloid , van der waals radius , molecule , organic chemistry , oceanography , engineering , geology , linguistics , philosophy
Surface‐inactive, highly hydrophilic particles are utilized to effectively and reversibly stabilize oil‐in‐water emulsions. This is a result of attractive van der Waals forces between particles and oil droplets in water, which are sufficient to trap the particles in close proximity to oil–water interfaces when repulsive forces between particles and oil droplets are suppressed. The emulsifying efficiency of the highly hydrophilic particles is determined by van der Waals attraction between particle monolayer shells and oil droplets enclosed therein and is inversely proportional to the particle size, while their stabilizing efficiency is determined by van der Waals attraction between single particles and oil droplets, which is proportional to the particle size. This differentiation in mechanism between emulsification and stabilization will significantly advance our knowledge of emulsions, thus enabling better control and design of emulsion‐based technologies in practice.