A systematic investigation into the influence of wettability spherical, nanometer-sized silica particles on type and stability water−toluene emulsions is described. The range from hydrophilic to hydrophobic depending extent chemisorbed silane their surfaces. We show that predictions based considerations energy attachment a single particle oil−water interface relate directly emulsions. combination powder immersion, shelf stability, light diffraction, microscopy measurements used characterize...

A theoretical treatment is developed for the wetting of a solid particle at an oil−water interface in terms components surface energies all three phases. Calculated contact angles given hydrophobicity with range oils different polarity show good agreement experimental data. For hydrophobically modified silica surface, increasing give higher measured through water. The results are line effect oil type on Pickering emulsion where more polar preferentially water-in-oil emulsions. approach also...

Foamability and foam stability: By using a novel dispersion method, suitably hydrophobic silica particles can be dispersed in water to form very stable foams through adsorption of particle aggregates at the surfaces micrometer-sized bubbles. The optical microscope image shows air bubbles pure stabilized solely by partially nanoparticles (scale bar: 50 μm).

The type and stability of Pickering emulsions stabilised by disc-like Laponite RD clay particles are described. By establishing the phase diagram aqueous dispersions as a function salt (NaCl) concentration, we deduce that toluene-in-water (o/w) emulsions, stable to creaming coalescence for at least 6 months, only formed under conditions where colloidal flocculated. initial average drop diameter is independent concentration but depends markedly on oil volume fraction, ranging from 10 28 μm....

Using a range of complementary experiments, detailed investigation into the behavior dodecane−water emulsions stabilized by mixture silica nanoparticles and pure cationic surfactant has been made. Both emulsifiers prefer to stabilize o/w emulsions. At high pH, particles are ineffective emulsifiers, whereas surfactant-stabilized become increasingly stable coalescence with concentration. In mixtures, no emulsion phase inversion occurs although synergism between leads enhanced stability at...

We describe the preparation and properties of oil-in-water emulsions stabilised by colloidal silica particles alone. The charge on their extent flocculation, assessed via turbidity measurements, can be modified pH control addition simple electrolytes. stability to both creaming coalescence is low in absence electrolyte, effects adding salt are dependent type salt. In systems containing NaCl, less stable once flocculated. presence either LaCl3 or tetraethylammonium bromide (TEAB), emulsion...

We have investigated a new class of food-grade particle, whey protein microgels, as stabilisers triglyceride-water emulsions. The sub-micron particles stabilised oil-in-water emulsions exhibiting exceptional resistance to coalescence.

Abstract High‐internal‐phase Pickering emulsions have various applications in materials science. However, the biocompatibility and biodegradability of inorganic or synthetic stabilizers limit their applications. Herein, we describe high‐internal‐phase with 87 % edible oil 88 n ‐hexane water stabilized by peanut‐protein‐isolate microgel particles. These dispersed phase fractions are highest all known food‐grade emulsions. The protein‐based particles different aggregate states depending on pH...

Superparamagnetic Fe3O4 nanoparticles prepared by a classical coprecipitation method were used as the stabilizer to prepare magnetic Pickering emulsions, and effects of particle concentration, oil/water volume ratio, oil polarity on type, stability, composition, morphology these functional emulsions investigated. The three-phase contact angle (θow) at oil−water interface was evaluated using Washburn method, results showed that for nonpolar weakly polar oils dodecane silicone, θow is close...

It is a dream that future synthetic chemistry can mimic living systems to process multistep cascade reactions in one-pot fashion. One of the key challenges mutual destruction incompatible or opposing reagents, for example, acid and base, oxidants reductants. A conceptually novel strategy developed here address this challenge. This based on layered Pickering emulsion system, which obtained through lamination emulsions. In working emulsion, dispersed phase separately compartmentalize reagents...

The study of solid particles residing at fluid-fluid interfaces has become an established area in surface and colloid science recently, experiencing a renaissance since around 2000. Particles arise many industrial products processes such as antifoam formulations, crude oil emulsions, aerated foodstuffs, flotation. Although they act ways like traditional surfactant molecules, offer distinct advantages also, the is now multidisciplinary, involving research fundamental potential applications....

To address the limitations of batch organic-aqueous biphasic catalysis, we develop a conceptually novel method termed Flow Pickering Emulsion, or FPE, to process reactions in continuous flow fashion. This involves compartmentalization bulk water into micron-sized droplets based on water-in-oil emulsion, which are packed column reactor. The compartmentalized can confine water-soluble catalysts, thus "immobilizing" catalyst reactor, while interstices between allow organic (oil) phase flow. Key...

Biocompatible and biodegradable porous scaffolds with adjustable pore structure have aroused increasing interest in bone tissue engineering. Here, we report a facile method to fabricate hierarchical macroporous biocompatible (HmPB) by combining Pickering high internal phase emulsion (HIPE) templates three-dimensional (3D) printing. HmPB composed of polymer matrix poly(l-lactic acid), PLLA, poly(ε-caprolactone), PCL, are readily fabricated solvent evaporation 3D printed HIPEs which stabilized...

Abstract Pickering emulsions are an excellent platform for interfacial catalysis. However, developing simple and efficient strategies to achieve product separation catalyst emulsifier recovery is still a challenge. Herein, we report the reversible transition between emulsification demulsification of light‐responsive emulsion, triggered by alternating UV visible light irradiation. The emulsion fabricated from Pd‐supported silica nanoparticles, azobenzene ionic liquid surfactant, n ‐octane,...

Abstract A continuous flow cascade of multi-step catalytic reactions is a cutting-edge concept to revolutionize stepwise synthesis yet still challenging in practical applications. Herein, method for one-pot catalysis developed by combining Pickering emulsions with flow. Our involves co-localization different catalytically active sub-compartments within droplets emulsion yielding cell-like microreactors, which can be packed column reactor catalysis. As exemplified two chemo-enzymatic the...