Stabilization of emulsions by fine particles I. Partitioning of particles between continuous phase and oil/water interface

Levine, S.; Bowen, Bruce D.; Partridge, Susan

doi:10.1016/0166-6622(89)80271-9

Cited by 459 publications

(357 citation statements)

References 38 publications

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“…[63][64] This high energy of particle attachment makes Pickering emulsions far more stable than surfactants, with the adsorbed particles providing a strong steric barrier to droplet coalescence. Colloidal particles such as silica sols [66][67] and polystyrene latexes 68 have been shown to be effective Pickering emulsifiers. Stimulus-responsive particulate emulsifiers have also been developed, with either inversion or demulsification being achieved in response to changes in solution pH [69][70] or temperature.…”

Section: Pickering Emulsionsmentioning

confidence: 99%

Covalently Cross-Linked Colloidosomes

et al. 2010

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Model poly(glycerol monomethacrylate)-based macromonomers have been used to prepare sterically stabilized polystyrene latexes by either aqueous emulsion or alcoholic dispersion polymerization, affording mean latex diameters of approximately 107 or 1188 nm respectively as judged by dynamic light scattering. Such PGMA50−PS latexes have appropriate surface wettability to stabilize 25−250 μm oil-in-water Pickering emulsions, depending on the latex concentration and oil type. Colloidosomes were formed by covalent cross-linking of the hydroxyl-functional stabilizer chains from within the oil droplets using a polymeric diisocyanate (tolylene 2,4-diisocyanate-terminated poly(propylene glycol) [PPG-TDI]. This oil-soluble cross-linker was confined within the oil droplets, allowing colloidosomes to be prepared at 50 vol % solids without any aggregation. The resulting microcapsules survive removal of the internal oil phase using excess alcohol, unlike the noncross-linked Pickering emulsion precursor. These observations confirm the robust nature of these covalently stabilized colloidosomes. A method for controlling the permeability of these colloidosomes by exploiting the solvent properties of binary oil mixtures has also been evaluated. Finally, microcapsule permeability has been explored via dye release experiments. Less permeable microcapsules can be obtained by deposition of polypyrrole onto the colloidosome exterior.

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Section: Pickering Emulsionsmentioning

confidence: 99%

Covalently Cross-Linked Colloidosomes

et al. 2010

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“…The synthesis of these composites is described in details in the Materials and methods section. In a nutshell, we trap solid inorganic colloids at the interface of an oil-in-water emulsion droplets of TPM [35].…”

Section: (D) Colloidal Surfersmentioning

confidence: 99%

Light-activated self-propelled colloids

Palacci

Sacanna

Kim

et al. 2014

Phil. Trans. R. Soc. A.

130

133

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Light-activated self-propelled colloids are synthesized and their active motion is studied using optical microscopy. We propose a versatile route using different photoactive materials, and demonstrate a multiwavelength activation and propulsion. Thanks to the photoelectrochemical properties of two semiconductor materials (α-Fe 2 O 3 and TiO 2 ), a light with an energy higher than the bandgap triggers the reaction of decomposition of hydrogen peroxide and produces a chemical cloud around the particle. It induces a phoretic attraction with neighbouring colloids as well as an osmotic selfpropulsion of the particle on the substrate. We use these mechanisms to form colloidal cargos as well as self-propelled particles where the light-activated component is embedded into a dielectric sphere. The particles are self-propelled along a direction otherwise randomized by thermal fluctuations, and exhibit a persistent random walk. For sufficient surface density, the particles spontaneously form 'living crystals' which are mobile, break apart and reform. Steering the particle with an external magnetic field, we show that the formation of the dense phase results from the collisions heads-on of the particles. This effect is intrinsically non-equilibrium and a novel principle of organization for systems without detailed balance. Engineering families of particles self-propelled by different wavelength demonstrate a good understanding of both the physics and the chemistry behind the system and points to a general route for designing new families of self-propelled particles.

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“…The initial self-assembled structures are known as Pickering emulsions 7 and have been recognized for over a century. Many examples of colloidal particles such as silica sols 8,9 and polystyrene latexes 10 have been shown to be effective Pickering emulsifiers. Stimulus-responsive particulate emulsifiers have also been developed, with inversion or demulsification being achieved in response to changes in solution pH 11,12 or temperature.…”

Section: Introductionmentioning

confidence: 99%

Colloidosomes: Synthesis, properties and applications

Thompson

Williams

Armes

2015

Journal of Colloid and Interface Science

194

174

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Colloidosomes represent a rapidly expanding field with various applications in microencapsulation, including the triggered release of cargoes. With self-assembled shells comprising colloidal particles, they offer significant flexibility with respect to microcapsule functionality. This review explores the various types of particles and techniques that have been employed to prepare colloidosomes. The relative advantages and disadvantages of these routes are highlighted and their potential as microcapsules for both small molecule and macromolecular actives is evaluated.

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Stabilization of emulsions by fine particles I. Partitioning of particles between continuous phase and oil/water interface

Cited by 459 publications

References 38 publications

Covalently Cross-Linked Colloidosomes

Covalently Cross-Linked Colloidosomes

Light-activated self-propelled colloids

Colloidosomes: Synthesis, properties and applications

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