Ultra-stable Pickering emulsion stabilized by a natural particle bilayer

Abstract

Ultra-stable Pickering emulsions synergistically stabilized by zein nanoparticles and starch nanocrystals were successfully prepared and the stabilization is ascribed to the double-layer shell of binary particles. The as-prepared Pickering emulsions...

Phosphotungstate-Functionalized Mesoporous Janus Silica Nanosheets for Reaction-Controlled Pickering Interfacial Catalysis

“…Oil/water biphasic catalysis has attracted great interest in laboratory synthesis and industrial fabrication, since it is a sustainable platform for producing various important chemicals via organic transformations, enzymatic reactions, and so on. − However, they often suffer from low catalytic efficiency because of the huge mass transfer resistance at a limited oil/water interfacial area. , Pickering interfacial catalysis (PIC) has recently aroused increasing interest for the oil/water biphasic catalysis. In these systems, the solid nanoparticle (NP) acts both as an emulsifier and a interfacial catalyst at the oil/water interface, which provides a large reaction interfacial area for mass transport, hence enhancing catalytic efficiency. − Amphiphilic Janus nanosheets (JNSs) with two opposite wetting surfaces have proven to be excellent candidates for stabilizing Pickering emulsions in PIC, owing to their high aspect ratio, large adsorption energy, and, especially, highly confined rotation at interfaces. − If one side of the JNSs is modified by catalytic sites, the catalytic JNSs will behave as a solid emulsifier and an interfacial catalyst simultaneously, significantly accelerating oil/water biphasic catalysis through the formation of thermodynamically stable Pickering emulsions. − Unfortunately, recovery of JNSs is a tedious process in the thermodynamically stable Pickering emulsions, since the energy moving JNSs from the oil/water interface is much higher than their thermal energy. , High-speed centrifugation (>18,000 rpm) or filtration is often required to overcome the energy barrier for JNS separation, which inevitably leads to more energy consumption if operated in a large volume. ,, Therefore, it is a key challenge to strike the balance between long-term stability and rapid demulsification of an emulsion in PIC.…”

Pickering Emulsions Simultaneously Stabilized by Starch Nanocrystals and Zein Nanoparticles: Fabrication, Characterization, and Application

“…It has been reported that the interfacial structure is important for emulsion stability. , Therefore, interfacial structures of Pickering emulsions stabilized at pH 4 and 9 were studied as representatives. Figure a–c shows that the Pickering emulsion prepared at pH 4 had a thick and intact bilayer interfacial structure . In contrast, the emulsion prepared at pH 9 had a disordered interfacial structure with ZNPs and SNCs mixed together and some of them randomly dispersed in water (Figure d–f).…”

“…We recently found a type of Pickering emulsion stabilized by zein protein nanoparticles (ZNPs) and starch nanocrystals (SNCs) with opposite charges, which remains stable under different environmental stresses. 24 Herein, we systematically explore connections between the packing of particles at the o/ w interface and the stability of prepared emulsions and explain the stabilizing mechanism of the emulsions via direct microscopic visualization. We then investigate different influencing factors on emulsion stability, including pH, ionic strength, particle concentration, and o/w ratio.…”

Microfluidic production of monodisperse emulsions for cosmetics

“…Colloidal materials used as substitutes for emulsifiers must not only form a rigid emulsion interface mechanically but also be very safe for the skin. [77][78][79] For a better sense of use, it is necessary to have the properties of appropriate adhesion to the skin. The hydrophobic modification of colloidal materials is a key strategy for manipulating skin adhesion while controlling their wettability against the emulsion interface.…”