Vaporizable endoskeletal droplets via tunable interfacial melting transitions
Vaporizable endoskeletal droplets via tunable interfacial melting transitions
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DOI：
10.1126/sciadv.aaz7188
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发表时间：
2020-04-01
期刊：
影响因子：
13.6
通讯作者：
Borden, Mark A.
中科院分区：
文献类型：
--
作者：
Shakya, Gazendra;Hoff, Samuel E.;Borden, Mark A.
乳化液液滴蒸发对于各种传感和成像应用是重要的。液体到气体的相变通常由低沸点液体热触发或声学触发，或者通过包含固定蒸气/液体接触线以促进非均质成核的固体结构来触发。然而，这些方法缺乏蒸发行为的精确可调性。在这里，我们描述了一种以前未使用的方法来控制蒸发行为，通过内骨架，可以熔化和融入液体核心，以增强或破坏凝聚力的分子间力。使用包封碳氟化合物（FC）或烃（HC）内骨架的全氟戊烷（C5 F12）液滴证明了这种效果。FC骨架抑制汽化，而HC骨架触发汽化附近的转子熔化过渡。我们的研究结果强调了骨架界面混合对液滴汽化的重要性。调节内骨架和液滴相之间的分子相互作用可推广用于实现乳液或乳液中的其他二次相变。
Liquid emulsion droplet evaporation is of importance for various sensing and imaging applications. The liquid-to-gas phase transformation is typically triggered thermally or acoustically by low-boiling point liquids, or by inclusion of solid structures that pin the vapor/liquid contact line to facilitate heterogeneous nucleation. However, these approaches lack precise tunability in vaporization behavior. Here, we describe a previously unused approach to control vaporization behavior through an endoskeleton that can melt and blend into the liquid core to either enhance or disrupt cohesive intermolecular forces. This effect is demonstrated using perfluoro-pentane (C5F12) droplets encapsulating a fluorocarbon (FC) or hydrocarbon (HC) endoskeleton. FC skeletons inhibit vaporization, whereas HC skeletons trigger vaporization near the rotator melting transition. Our findings highlight the importance of skeletal interfacial mixing for initiating droplet vaporization. Tuning molecular interactions between the endoskeleton and droplet phase is generalizable for achieving emulsion or other secondary phase transitions, in emulsions.