Surface force studies of Langmuir-Blodgett cellulose films

Monika Österberg, J Berg, S Stemme, L Odberg, J Rasmusson, P Claesson

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The interactions between cellulose surfaces, between chitosan-coated surfaces, and between one cellulose surface and one chitosan-coated surface have been studied using the interferometric surface force apparatus (SFA). The cellulose surfaces were prepared by depositing trimethylsilyl cellulose on hydrophobized mica using the Langmuir-Blodgett technique. The surfaces were desilylated in a humid HCl atmosphere to obtain regenerated cellulose. ESCA measurements and wetting studies demonstrated that the desilylation process was effective. Scanning force microscopy studies showed the cellulose surfaces to be smooth with a root-mean-square roughness of 0.16 nm. Surface force and ellipsometry measurements illustrate that the cellulose film swells considerably in humid air and in water, suggesting that it is mostly amorphous. The interaction between two cellulose surfaces is dominated by a steric repulsion caused by a few dangling tails. On separation an attractive force was present both between two cellulose surfaces and between one cellulose surface and one chitosan surface. The long-range interaction between cellulose and chitosan was shown to be attractive. (C) 1997 Academic Press.

Original languageEnglish
Pages (from-to)369-381
Number of pages13
JournalJournal of Colloid and Interface Science
Volume186
Issue number2
DOIs
Publication statusPublished - 15 Feb 1997
MoE publication typeA1 Journal article-refereed

Keywords

  • surface forces
  • cellulose
  • chitosan
  • Langmuir-Blodgett films
  • ellipsometry
  • ADSORBED LAYERS
  • MICA SURFACES
  • ADHESION
  • CONTACT
  • WATER
  • ELLIPSOMETRY
  • DEFORMATION
  • INTERFACE
  • ENERGY
  • FIBERS

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