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Cellulose

, Volume 6, Issue 1, pp 1–13 | Cite as

Spectroscopic Ellipsometry Characterisation and Estimation of the Hamaker Constant of Cellulose

  • Lennart Bergström
  • Sara Stemme
  • Torbjörn Dahlfors
  • Hans Arwin
  • Lars Ödberg
Article

Abstract

Calculations of Hamaker constants using Lifshitz theory require the availability of accurate dielectric data, especially in the visible-ultraviolet region. We present spectroscopic ellipsometry data on well-defined cellulose films of a limited thickness range (100–140 layers) deposited on an oxidised and hydrophobised silicon substrate. The spectral data, representing measurements from a perpendicular orientation to the fibre deposition direction, was used for estimates of the necessary spectral parameters, i.e. the oscillator strengths and characteristic frequencies in the UV-range. Our calculations show that cellulose has a relatively low Hamaker constant in air (58 zJ) and water (8.0 zJ). The implications for the surface energy estimates of cellulose and colloidal interactions between cellulose and various types of fillers and coating colours are indicated.

Hamaker cellulose spectroscopic ellipsometry refractive index paper 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Lennart Bergström
    • 1
  • Sara Stemme
    • 2
  • Torbjörn Dahlfors
    • 2
  • Hans Arwin
    • 3
  • Lars Ödberg
    • 2
  1. 1.Institute for Surface ChemistryStockholmSweden
  2. 2.Swedish Pulp and Paper Research InstituteStockholmSweden
  3. 3.Department of Physics and Measurement TechnologyLinköping Institute of TechnologyLinköpingSweden

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