Power spectral density of free-standing viscoelastic films by adiabatic approximation

Hai Yao Deng, Ranxing N. Li, Haitao Huang, Ophelia K C Tsui, Chi Hang Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

In a previous study, we calculated the surface dynamics of noisy viscoelastic supported films by using an adiabatic approximation. An expression was derived for the time-dependent power spectral density (PSD), which was found to produce good agreement with experiment. In this study, we extend the treatment to viscoelastic free-standing films. Two sets of surface capillary normal modes, namely, the squeezing and bending modes, were found. The frequency dispersion relation of the former resembles that of supported films. The latter is distinctively different and diverges at long wavelengths. By incorporating the experimental conditions, we obtained satisfactory agreement between theory and experiment.
Original languageEnglish
Pages (from-to)4283-4289
Number of pages7
JournalLangmuir
Volume29
Issue number13
DOIs
Publication statusPublished - 2 Apr 2013

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

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