Deformation and coalescence of particle-stabilized oil droplets in drying aqueous NaCl solutions
Deformation and coalescence of particle-stabilized oil droplets in drying aqueous NaCl solutions
复制标题
干燥 NaCl 水溶液中颗粒稳定油滴的变形和聚结
DOI：
10.1016/j.colsurfa.2021.127816
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Inasawa Susumu
中科院分区：
文献类型：
--
作者：
Abe Kohei;Inasawa Susumu
研究了离子浓度对分散在水中的颗粒稳定油滴的变形和聚并的影响。我们乳化油和二氧化硅颗粒的水溶液的混合物，具有范围从0 M至3 M的各种NaCl浓度。油滴通过水相的蒸发而自发地压缩。在低离子浓度（< 0.1 M）下，液滴紧密堆积并变形为多边形，然后在水干燥的最后阶段聚结。油滴的柔性变形建议液体样的油-水界面，即使它们被吸附的固体颗粒稳定。相反，在高离子浓度（> 0.1 M）下未观察到液滴的紧密堆积;然而，它们更容易聚结并形成更大的椭圆形液滴。聚结的液滴没有松弛成球形。我们观察到在高离子浓度下在水相中形成二氧化硅颗粒的大聚集体。这表明颗粒聚集体吸附在油水界面上，这与固体状油水界面密切相关。相比之下，由于颗粒之间的排斥力，在低离子浓度下颗粒良好地分散在水相中。因此，在油-水界面上的吸附颗粒没有形成固体状颗粒壳，界面保持液体状。我们还证实，离子浓度的增加或减少，即使在形成颗粒稳定的油滴，导致相同的界面响应。离子浓度影响吸附的二氧化硅颗粒，是颗粒稳定的油滴在水相中的界面性质的主导因素。
The effects of ion concentration on the deformation and coalescence of particle-stabilized oil droplets dispersed in water were investigated. We emulsified a mixture of oil and an aqueous solution of silica particles with various NaCl concentrations ranging from 0 M to 3 M. Oil droplets were spontaneously compressed by evaporation of the water phase. At low ion concentrations (< 0.1 M), the droplets were tightly packed and deformed into polygonal shapes, before coalescing in the final stage of water drying. The flexible deformation of the oil droplets suggested liquid-like oil-water interfaces, even though they were stabilized by adsorbed solid particles. Conversely, tight packing of the droplets was not observed at high ion concentrations (> 0.1 M); however, they coalesced more readily and formed larger ellipsoidal droplets. The coalesced droplets did not relax to a spherical shape. We observed the formation of large aggregates of the silica particles in the water phase at high ion concentrations. This suggested that aggregates of particles adsorbed on the oil-water interfaces and this would be closely related to solid-like oil-water interfaces. In contrast, the particles were well dispersed in the water phase at low ion concentrations because of repulsive forces between the particles. Thus, the adsorbed particles on the oil-water interfaces did not form solid-like particulate shells and the interfaces remained liquid-like. We also confirmed that an increase or decrease in ion concentration, even after formation of particle-stabilized oil droplets, resulted in the same interface responses. The ion concentration affected adsorbed silica particles and was a dominant factor for the interfacial properties of particle-stabilized oil droplets in the water phase.
影响因子：
3.4
作者：
Hermes, Michiel;Clegg, Paul S.
通讯作者：
Clegg, Paul S.
将颗粒稳定乳液挤压成双液体泡沫 - 状态方程†
影响因子：
3.4
作者：
L. Maurice;R. A. Maguire;A. Schofield;M. Cates;P. Clegg;J. H. Thijssen
通讯作者：
J. H. Thijssen
影响因子：
3.4
作者：
Hasegawa, K.;Inasawa, S.
通讯作者：
Inasawa, S.