Ashland Consumer Markets/Valvoline, Lexington, KY, USA.
J Colloid Interface Sci. 2011 Sep 15;361(2):581-6. doi: 10.1016/j.jcis.2011.05.069. Epub 2011 Jun 13.
The destabilization mechanism was investigated of a triple Janus emulsion. The inner part of the emulsion consisted of Janus drops of a vegetable oil (VO) and a silicone oil (SO) in an aqueous (W) drop, (VO+SO)/W. This drop, in turn was dispersed in a VO drop forming a double emulsion (VO+SO)/W/VO. Finally, these complex drops generated a complex Janus (SO+VO)/W/VO/SO triple emulsion by being dispersed in a continuous SO phase. The observations were limited to the time dependence of the over-all creaming/sedimentation processes, to the separation of layers of the compounds and to optical microscopy of the drop configuration with time. In the destabilization process the rise of the complex drops, (SO+VO)/W/VO, caused crowding in the upper part of the emulsion, which in turn led to enhanced coalescence, inversion and separation of a dilute vegetable oil emulsion. As a consequence of the separation of VO in the process, the remaining drops contained a greater W fraction and greater density. This change, in turn, resulted in sedimentation of the complex drops to form several high internal ratio morphologies in an SO continuous emulsion in the lower part of the test tube, among them a W/VO/SO emulsion. Finally, an inversion took place into an SO/VO/W double emulsion forming a separate bottom layer.
研究了一种三重各向异性乳液的不稳定性机制。乳液的内部分别为植物油（VO）和硅油（SO）在水（W）中的各向异性液滴，（VO+SO）/W。该液滴继而分散在 VO 液滴中形成双乳液（VO+SO）/W/VO。最后，这些复杂的液滴通过分散在连续的 SO 相中生成复杂的各向异性（SO+VO）/W/VO/SO 三重乳液。观察仅限于整体乳状液/沉降过程的时间依赖性，化合物的分层分离以及随时间变化的液滴构型的光学显微镜观察。在失稳过程中，复杂液滴（SO+VO）/W/VO 的上升导致乳液上部的拥挤，这反过来又导致了更强烈的聚结、反转和稀释植物油乳液的分离。由于在这个过程中 VO 的分离，剩余的液滴包含了更大的 W 分数和更大的密度。这种变化反过来又导致了复杂液滴的沉降，在试管下部的 SO 连续乳液中形成了几种高内比形态，其中包括 W/VO/SO 乳液。最后，发生了反转，形成了 SO/VO/W 双乳液，形成了单独的底层。
