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The European Physical Journal Special Topics

, Volume 189, Issue 1, pp 181–186 | Cite as

Dynamics in ultrathin liquid films studied by simultaneous dielectric spectroscopy (DRS) and organic molecular beam deposition (OMBD)

  • M. Wübbenhorst
  • S. Capponi
  • S. Napolitano
  • S. Rozanski
  • G. Couderc
  • N.-R. Behrnd
  • J. Hulliger
Regular Article

Abstract.

Real-time dielectric relaxation spectroscopy for a molecular beam deposited glass forming liquids is proposed as a versatile approach for the study of the dynamic glass transition in geometric confinement. To achieve the highest sensitivity down to monomolecular organic layers in a wide frequency range (0.1–107  Hz) during simultaneous deposition and desorption, we have used μm spaced interdigitated electrodes under ultrahigh vacuum conditions. Experiments using glycerol deposited on fused silica at − 40  C revealed a dielectric glass transition process for a layer thickness as low as 0.7 nm. While its peak position hardly changes upon thickness reduction, a clear broadening is observed that implies an increasing heterogeneous mobility scenario for the thinnest films caused by molecules being part of a reduced (at the substrate) or enhanced (free surface) mobility layer. This finding is supported by desorption experiments that reveal a strong retardation of the desorption rate for films below 1 nm.

Keywords

European Physical Journal Special Topic Quartz Crystal Microbalance Quartz Crystal Microbalance Sensor Mobility Layer Dynamic Glass Transition 
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 2010

Authors and Affiliations

  • M. Wübbenhorst
    • 1
  • S. Capponi
    • 1
  • S. Napolitano
    • 1
  • S. Rozanski
    • 1
  • G. Couderc
    • 2
  • N.-R. Behrnd
    • 2
  • J. Hulliger
    • 2
  1. 1.Department of Physics and AstronomyKatholieke Universiteit LeuvenLeuvenBelgium
  2. 2.Department of Chemistry and BiochemistryUniversity of BerneBerneSwitzerland

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