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Charge regulation and energy dissipation while compressing and sliding a cross-linked chitosan hydrogel layer
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
2015 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 443, s. 162-169Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Interactions between a silica surface and a surface coated with a grafted cross-united hydrogel made from chitosan/PAA multilayers are investigated, utilizing colloidal probe atomic force microscopy. Attractive double-layer forces are found to dominate the long-range interaction over a broad range of pH and ionic strength conditions. The deduced potential at the hydrogel/aqueous interface is found to be very low. This situation is maintained in the whole pH-range investigated, even though the degree of protonation of chitosan changes significantly. This demonstrates that pH-variations change the concentration of counterions within the hydrogel to keep the interior close to uncharged, which is similar to what has been observed for polyelectrolyte brushes. Changes in pH and ionic strength affect the adhesion force and the friction force between the silica surface and the hydrogel layer, but not the friction coefficient. This suggests that the main energy dissipation mechanism arises from processes occurring within the hydrogel layer, rather than at the silica/hydrogel interface, and we suggest that it is related to stretching of polymer chains between the cross-linking points. We also find that an increased cross-linking density, from 40% to 100%, in the hydrogel reduces the friction coefficient. (C) 2014 Elsevier Inc. All rights reserved.

Ort, förlag, år, upplaga, sidor
2015. Vol. 443, s. 162-169
Nyckelord [en]
Chitosan, Hydrogel, Surface force, Friction, pH, Ionic strength
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-161087DOI: 10.1016/j.jcis.2014.12.003ISI: 000348696700021PubMedID: 25553574Scopus ID: 2-s2.0-84920884287OAI: oai:DiVA.org:kth-161087DiVA, id: diva2:797968
Forskningsfinansiär
VetenskapsrådetStiftelsen för strategisk forskning (SSF)
Anmärkning

QC 20150325

Tillgänglig från: 2015-03-25 Skapad: 2015-03-09 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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