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Spectroscopic ellipsometry characterisation and estimation of the Hamaker constant of cellulose
YKI – Ytkemiska institutet.
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1999 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 6, 1-13 p.Article in journal (Refereed)
Abstract [en]

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 were discussed.

Place, publisher, year, edition, pages
1999. Vol. 6, 1-13 p.
Keyword [en]
Hamaker, cellulose, spectroscopic ellipsometry, refractive index, paper
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26340OAI: oai:DiVA.org:ri-26340DiVA: diva2:1053342
Note
A1222Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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