Ultrasonic Studies of Emulsion Stability in the Presence of Magnetic Nanoparticles

Abstract

Pickering emulsions are made of solid particle-stabilized droplets suspended in an immiscible continuous liquid phase. A magnetic emulsion can be obtained using magnetic particles. Solid magnetic nanoparticles are adsorbed strongly at the oil-water interface and are able to stabilize emulsions of oil and water. In this work emulsions stabilized by magnetite nanoparticles were obtained using high-energy ultrasound waves and a cavitation mechanism and, next, their stability in time was tested by means of acoustic waves with a low energy, without affecting the structure. An acoustic study showed high stability in time of magnetic emulsions stabilized by magnetite particles. The study also showed a strong influence of an external magnetic field, which can lead to changes of the emulsion properties. It is possible to control Pickering emulsion stability with the help of an external stimulus—a magnetic field.

Synthesis of metallic nanoparticles from Beta vulgaris using a single-pot green chemistry approach and their environmental engineering application

“…Overall, the nanoparticles and the amphiphilic nature of the biosurfactants cooperatively aided in the stability of the kerosene emulsions. A similar phenomenon was previously described by Józefczak and Wlazło [11], whereby positively charged surfactant head groups adsorbed on to the surface of hydrophilic magnetic nanoparticles, exposing hydrophobic tails, which aided the stabilisation of emulsions studied.…”

Waterborne Cross-Linkable Polyacrylate Latex Coatings with Good Water Resistance and Strength Stabilized by Modified Hectorite

“…There are several particles that meet the partial wetting conditions for water and oil that can be used as Pickering emulsion emulsifiers, including calcium carbonate [6], clays (montmorillonite and hectorite) [9][10][11][12][13], magnetic particles [14], carbon nanotubes [15], and carbon black [16]. Hectorite is a montmorillonite-like nanoparticle with oppositely charged surfaces and edges (50-55 mEq/100 g negative charge density on the surface and 4-5 mEq/100 g positive charge density on the edge).…”

Review on Application of Nanotechnology for Asphaltene Adsorption, Crude Oil Demulsification, and Produced Water Treatment

“…In comparison with NPs, nanocomposites exhibit higher mechanical stability, process ability, and some advantages caused by the NP–matrix interactions. Moreover, magnetic NPs can also enhance the demulsification process by adsorbing at the surfaces of emulsion droplets. , After application of an external magnetic field, these droplets accumulate, coalesce, and subsequently separate. The interfacial activity, which is one of the most prominent properties of the NPs, is typically introduced by functionalization reactions design to introduce specific functional groups.…”