Observation of surface layering in a nonmetallic liquid

Details Observation of surface layering in a nonmetallic liquid Observation of surface layering in a nonmetallic liquid

2005-10-26

arxiv.org/abs/cond-mat/0510712v2

Phys. Rev. Lett. 96, 096107 (2006)

Physics

Condensed Matter

Soft Condensed Matter

accepted for publication in Phys. Rev. Lett. 15 pages 4 figures

Scientific paper

10.1103/PhysRevLett.96.096107

Oscillatory density profiles (layers) have previously been observed at the free surfaces of liquid metals, but not in other isotropic liquids. We have used x-ray reflectivity to study a molecular liquid, tetrakis(2-ethylhexoxy)silane. When cooled to T/Tc~0.25 (well above the freezing point for this liquid), density oscillations appear at the surface. Lateral order within the layers is liquid-like. Our results confirm theoretical predictions that a surface-layered state will appear even in dielectric liquids at sufficiently low temperatures, if not preempted by freezing.

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