Control of contact angles at the oil-water-solid interfaces. Emulsions stabilized by solid particles (BaSO4)

Synthesis of Nano/Microstructures at Fluid Interfaces

“…In general, to make stable emulsions, the less-wetting liquid should be the dispersed phase. [30] For example, Binks and Lumsdon demonstrated that using a toluene/water system, which has an interfacial tension of 36 mN m À1 , 10 nm-diameter silica nanoparticles, having different wettabilities based on surface functionality, showed a maximum in desorption energy and has at a contact angle of 908. [21] Increasing or decreasing the contact angle decreases the stability of the emulsion.…”

Effect of pH on Adsorption and Desorption of Clay Particles at Oil–Water Interface

“…For droplet coalescence to occur, particles must be 90Њ stabilize oil-in-water emulsions, while hydrophobic solsubmerged into one of the bulk phases. Such a process reids with a contact angle slightly larger than 90Њ stabilize quires additional energy and hence the particles provide a water-in-oil emulsions (2). The fine solids surrounding an barrier to coalescence.…”

Architected cellular ceramics with tailored stiffness via direct foam writing

“…liquid-gas (γ lg ), and solid-gas (γ sg ) interfaces is balanced, such that the contact angle (θ) of the particles and the solvent is between the range of 14°and 90°(calculated for 300-nm particles), the particles irreversibly and spontaneously adsorb onto liquidgas (bubble) interfaces introduced during foaming ( Fig. 1 B and C) (29)(30)(31)(32)(33)(34). The adsorbed particles physically prevent van der Waals collapse and Ostwald ripening, and for sufficiently attractive interparticle interactions, arrest drainage, yielding a stable foam microstructure that retains its characteristic bubble content and size over long times (35).…”

“…Reliably printing highly porous wet foams is inherently difficult because of the excess surface energy associated with the gas-liquid interface. If the gas-liquid interface is not well stabilized, bubble collapse will occur because of van der Waals attraction between adjacent interfaces, Ostwald ripening, or gravitational syneresis (29)(30)(31)(32)(33)(34). Our foam ink is produced by mechanically frothing an aqueous suspension of partially hydrophobized alumina particles (34) (Movie S1).…”