The role of polymer compatibility in adhesion between surfaces saturated with modified dextrans
2007 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 310, no 1, 312-320 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2007. Vol. 310, no 1, 312-320 p.
adhesion, interaction forces, polymer, adsorption, incompatible, asymmetric, cationic dextran, hydrophobic, hydrophilic, AFM, colloidal probe technique, JKR
IdentifiersURN: urn:nbn:se:kth:diva-6120DOI: 10.1016/j.jcis.2007.01.089ISI: 000245967500038ScopusID: 2-s2.0-34147094843OAI: oai:DiVA.org:kth-6120DiVA: diva2:10739
QC 20110125. Uppdaterad från manuskript till artikel(20110125)2006-09-142006-09-142012-10-02Bibliographically approved