Multiple Pickering emulsions fabricated by a single block copolymer amphiphile in one-step

He, Xiaolong; Xue, Yan; Dong, Jianfeng; Li, Xuefeng

doi:10.1016/j.colsurfa.2022.130557

Cited by 4 publications

(1 citation statement)

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“…From various studies, it has been identified that the differential wettability of surface active species to the two fluids used for emulsification is crucial to realize the formation of DEs. In the previous studies DEs have been successfully formulated using colloidal particles, diblock polymer, copolymers, and surfactants, which are initially present in one of the two immiscible liquids. ,,,− In here, we use hematite ellipsoidal as a model particle system and oleic acid as surface modifier to stabilize Pickering DEs. The particle surface was modified with varying oleic acid concentrations to impart different degrees of surface modification.…”

Section: Introductionmentioning

confidence: 99%

Single-Step Formation of Pickering Double Emulsions by Exploiting Differential Wettability of Particles

Kumar,

Tiwari,

Dugyala

et al. 2024

Langmuir

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We present a modular single-step strategy for the formation of single and Pickering double emulsions (DEs). To this end, we consider the role of surface modification of particles and their dispersibility in different phases in the context of the design of Pickering emulsions by varying the volume fraction of oil in the oil−water mixture (ϕ oil ) used for emulsification. In particular, the experiments are performed by considering (a) model spherical and nonspherical colloids of different wettabilities which are tailored by oleic acid treatment, (b) immiscible liquids with or without particles, and (c) varying ϕ oil from 0.1 to 0.9. We show that it is possible to affect a transition from (i) oil-in-water (O/W) emulsion to water-in-oil (W/O) emulsion and (ii) oil-in-water (O/W) to oilin-water-in-oil (O/W/O) to water-in-oil (W/O) as ϕ oil is systematically varied. We elucidate that the range of ϕ oil at which particle stabilized DEs of the O/W/O type form can be tuned by engineering surface modification of particles to different extents. Furthermore, the arrangement of particles on the surface of droplets in the Pickering DEs is discussed. Our results conclusively establish that the differential wettability of particles is the key for the design of Pickering DEs. The versatility of the proposed strategy is established by developing DEs using a number of model colloidal systems.

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