Observation of surface layering in a nonmetallic liquid |
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Authors: | Mo Haiding Evmenenko Guennadi Kewalramani Sumit Kim Kyungil Ehrlich Steven N Dutta Pulak |
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Affiliation: | Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA. |
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Abstract: | 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 approximately 0.25 (well above the freezing point for this liquid), density oscillations appear at the surface. Lateral order within the layers is liquidlike. 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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