Home List of Titles Morphology of modified regenerated model cellulose II surfaces studied by atomic force microscopy: effect of carboxymethylation and heat treatment
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231539
- Morphology of modified regenerated model cellulose II surfaces studied by atomic force microscopy: effect of carboxymethylation and heat treatment
- Notley, Shannon M.; Wagberg, Lars
- 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 degrees Celsius 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 pKₐ 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.
- Publication type
- Journal article
- Biomacromolecules, Vol. 6, no. 3 (May 2005), pp. 1586-1591
- Publication year
- FOR Code(s)
- 03 Chemical Sciences; 06 Biological Sciences; 09 Engineering
- Anatomy; Atomic force microscopy; Carbohydrate analysis; Carboxylation; Carboxymethylation; Carboxymethylcellulose; Cellulose films; Controlled study; Fibrillar structures; Heat treatment; Hydrogen bond; Hydrogen bonds; Methylation; Molecular interaction; Morphology; pH; Surface charge; Surface forces; Surface properties; Surface structure; Van der Waals forces; Wood pulp
- American Chemical Society
- Publisher URL
- Copyright © 2005 American Chemical Society.
- Peer reviewed