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Morphology of modified regenerated model cellulose II surfaces studied by atomic force microscopy: Effect of carboxymethylation and heat treatment
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2005 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 6, no 3, p. 1586-1591Article in journal (Refereed) Published
Abstract [en]

Model cellulose II surfaces with different surface charge have been prepared from carboxymethylated wood pulp. AFM tapping-mode imaging in air showed that the introduction of charged groups into the film does not appreciably change the surface morphology. However, after a mild heat treatment (heating at 105 ° C for 6 h), an irreversible surface structure change, from near spherical-type aggregates to a fibrillar structure, was observed. This might be attributed to the formation of strong hydrogen bonds in the crystalline region of the films while the amorphous regions shrank upon drying. The suitability of these charged cellulose films for surface forces studies was also investigated. At pH below the pK(a) of the carboxyl groups present in the film, the interaction force could be fit by a van der Waals force interaction. At higher pH, the interaction was of a purely electrostatic nature with no van der Waals component observable due to the swelling of the surfaces.

Place, publisher, year, edition, pages
2005. Vol. 6, no 3, p. 1586-1591
Keyword [en]
probe microscopy, films, hornification, electrolyte
Identifiers
URN: urn:nbn:se:kth:diva-14752DOI: 10.1021/bm050005uISI: 000229138900054Scopus ID: 2-s2.0-20144370623OAI: oai:DiVA.org:kth-14752DiVA, id: diva2:332793
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Wågberg, Lars

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