Polyhedral
Water Droplets: Shape Transitions and Mechanism
Posted on 2020-04-29 - 19:13
While
classical liquid droplets are rounded, transitions have recently
been discovered which render polyhedral water-suspended droplets of
several oils. Yet, the mechanism of these transitions and the role
of the droplets’ interfacial curvature in inducing these transitions
remain controversial. In particular, one of the two mechanisms suggested
mandates a convex interface, in a view from the oil side. Here we
show that oil-suspended water droplets can spontaneously assume polyhedral
shapes, in spite of their concave interface. These results strongly
support the alternative mechanism, where the faceting in both oil
and water droplets is driven by the elasticity of a crystalline monolayer, known to self-assemble at the oil–water
interface, independent of its curvature. The faceting transitions
in the water droplets allow the fundamental elastic properties of
two-dimensional matter to be probed, enable new strategies in faceted
nanoparticle and nanoshell synthesis, and provide insight into the
molecular mechanisms of morphogenesis.
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Liber, Shir R.; Marin, Orlando; Butenko, Alexander V.; Ron, Racheli; Shool, Lee; Salomon, Adi; et al. (2020). Polyhedral
Water Droplets: Shape Transitions and Mechanism. ACS Publications. Collection. https://doi.org/10.1021/jacs.0c00184
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AUTHORS (8)
SL
Shir R. Liber
OM
Orlando Marin
AB
Alexander V. Butenko
RR
Racheli Ron
LS
Lee Shool
AS
Adi Salomon
MD
Moshe Deutsch
ES
Eli Sloutskin