微粒稳定液滴在微吸管抽吸下的机械稳定性
Mechanical stability of particle-stabilized droplets under micropipette aspiration
摘要：
我们研究的机械行为的颗粒稳定液滴使用微管抽吸。我们观察到，液滴稳定的两亲性哑铃形颗粒表现出两个阶段的响应增加吸入压力。水滴先滴落，然后像有弹性的贝壳一样起皱、弯曲。虽然颗粒对失效机制具有显著影响，但液滴的机械强度仅适度增加。另一方面，涂覆有分子表面活性剂十二烷基硫酸钠的液滴甚至比裸液滴更弱。在所有情况下，临界压力的大小为不稳定性的开始是由流体表面张力。
英文摘要：
We investigate the mechanical behavior of particle-stabilized droplets using micropipette aspiration. We observe that droplets stabilized with amphiphilic dumbbell-shaped particles exhibit a two-stage response to increasing suction pressure. Droplets first drip, then wrinkle and buckle like an elastic shell. While particles have a dramatic impact on the mechanism of failure, the mechanical strength of the droplets is only modestly increased. On the other hand, droplets coated with the molecular surfactant Sodium Dodecyl Sulfate are even weaker than bare droplets. In all cases, the magnitude of the critical pressure for the onset of instabilities is set by the fluid surface tension.
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