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The European Physical Journal Special Topics

, Volume 167, Issue 1, pp 163–169 | Cite as

Observation of slowly decreasing molecular oscillations in ultrathin liquid films using X-ray reflectivity

  • D. R. Lee
  • S. H. Choi
  • H. H. Lee
  • J.-Y. Kim
  • C.-J. YuEmail author
Regular Article
  • 39 Downloads

Abstract

We studied ~0.5 μm and 30–80 Å thick films of a normal dielectric liquid, tetrakis(2-ethylhexoxy)silane (TEHOS), at temperature range 228–286 K, deposited onto silicon (111) substrate with native oxide using X-ray reflectivity. TEHOS is spherical with size ~10 Å, non-polar, non-reactive, and non-entangling; TEHOS has been reported to show interfacial layering at room temperature and surface layering at 0.23 Tc (Tc≈ 950 K). For films \(\sim\!0.5\,\mu\)m thick, the reflectivity data did not change significantly as a function of temperature; for films 30–80 Å thick, the reflectivity data did change. The data could be fitted with an electron density model composed of a minimum necessary number of Gaussians and a uniform density layer with error-function broadened interfaces. When the film thickness is 60–80 Å below 246 K, we found that the interface and the surface layering coexist but do not overlap. When the film thickness is 30–40 Å below 277 K, they overlap and the electron density profile shows slowly decreasing molecular oscillations at the air-liquid interface.

Keywords

Interfacial Layering European Physical Journal Special Topic Density Model Pair Correlation Function Molecular Oscillation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2009

Authors and Affiliations

  • D. R. Lee
    • 1
  • S. H. Choi
    • 2
  • H. H. Lee
    • 2
  • J.-Y. Kim
    • 3
  • C.-J. Yu
    • 2
    Email author
  1. 1.Department of PhysicsSoongsil UniversitySeoulKorea
  2. 2.Pohang Accelerator LaboratoryGyeongbukKorea
  3. 3.Department of PhysicsHanyang UniversitySeoulSouth Korea

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