The role of polymer compatibility in the adhesion between surfaces saturated with modified dextrans

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The role of polymer compatibility in the adhesion between surfaces saturated with modified dextrans

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231545

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Title: The role of polymer compatibility in the adhesion between surfaces saturated with modified dextrans
Author(s): Eriksson, Malin; Notley, Shannon M.; Pelton, Robert; Wagberg, Lars
Abstract: Wet and dry adhesion between dextran-coated surfaces were measured aiming to understand the influence of polymer compatibility. The wet adhesion measurements were performed using the atomic force microscope (AFM) colloidal probe technique whereas the dry adhesion measurements were performed using the micro adhesion measurement apparatus (MAMA). Two types of dextrans were used, one cationically modified dextran (DEX) and one that was both cationically and hydrophobically modified (HDEX), leading to three different combinations of polymer-coated surfaces; (1) DEX:DEX, (2) HDEX:DEX, and (3) HDEX:HDEX. DEX increased dry adhesion more than HDEX did, which likely is due to differences in the ability to form specific interactions, especially hydrogen bonding. HDEX gave strong wet adhesion, probably due to its poorer solvency, while DEX contributed to reducing the wet adhesion due to its hydrophilicity. All combinations showed a steric repulsion on approach in aqueous media. Furthermore, when HDEX was adsorbed on either or both surfaces a long range attractive force between the surfaces was detected outside this steric regime.
Publication type: Journal article
Source: Journal of Colloid and Interface Science, Vol. 310, no. 1 (Jun 2007), pp. 312-320
Publication year: 2007
FOR Code(s): 02 Physical Sciences; 03 Chemical Sciences; 09 Engineering
Keyword(s): Adhesion; Adsorption; AFM; Aqueous solution; Asymmetric; Atomic force microscopy; Cationic dextran; Colloidal probe technique; Compression; Dextran derivative; Hydrogen bonds; Hydrophilic; Hydrophobic; Interaction forces; JKR; MAMA; Micro adhesion measurement apparatus; Molecular interaction; Polymer compatibility; Stereospecificity; Surface properties
Publisher: Academic Press
ISSN: 0021-9797
Publisher URL: http://dx.doi.org/10.1016/j.jcis.2007.01.089
Additional information: Supported by the Cooperative Research Centre for Functional Communication Surfaces (CRC SmartPrint).
Peer reviewed