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• W2107434023 abstract "This thesis concentrates on the effect of cationic polyelectrolyte addition on the interactions between inorganic and model cellulose surfaces in aqueous solutions. An effort was made to link the physicochemical properties of the polyelectrolytes, such as charge density, molecular mass and architecture to the type of interactions they generate upon adsorption to glass and cellulose. The Langmuir-Blodgett deposition technique was used in order to prepare thin, molecularly smooth cellulose films on hydrophobized mica substrates. The low surface roughness of the model cellulose surface allowed accurate surface force determination at any separation, down to surface contact. Flame polished, borosilicate glass was used as an inorganic surface. As a force-measuring device, the non-interferometric surface force apparatus (MASIF) was selected for its ability to handle a large variety of surface materials and fast data acquisition. As a rule, force measurements were performed first at zero polyelectrolyte addition, i.e. in polyelectrolyte-free salt solutions. From these measurements the surface charge density of the studied substrates could be determined by fitting DLVO-theory to the experimental force profiles. The cellulose surface was found to be weakly negatively charged. The slow swelling of the cellulose film could also be detected from the force data. All studied polyelectrolytes adsorb on glass and cellulose, causing charge neutralization at very low bulk concentration (1 ppm). At the charge neutralization point a bridging attraction is found for highly charged polyelectrolytes. This is followed by charge reversal at higher concentrations. The magnitude of this charge reversal was dependant on the polyelectrolyte structure and charge density, as well as on the charge density of the substrate surface. For the particular case of weakly charged polyelectrolyte AM-MAPTAC 10 adsorbing on cellulose surfaces the interaction was dominated by a long-ranged steric force due to the large thickness of the adsorbed polymer layer. In other investigations, the forces between surfaces asymmetrically coated with polyelectrolytes were investigated and found to be attractive at large separations. Possible electrostatic and polymer-induced effects are considered as a cause of the long-ranged attraction in these cases. Additional information about the surface properties of glass, cellulose and other substrates was obtained by studying the adhesion in air between these substrates and hemispherical PDMS caps employing the JKR method. Data for the work of adhesion was collected and shown to be in a good agreement with calculated values. Both glass and cellulose exhibited a hysteresis between loading and unloading cycles. The result was discussed in terms of surface layer interpenetration and formation of chemical bonds between reactive surface groups." @default.
• W2107434023 created "2016-06-24" @default.
• W2107434023 creator A5017932028 @default.
• W2107434023 date "2001-01-01" @default.
• W2107434023 modified "2023-09-28" @default.
• W2107434023 title "Polyelectrolyte Moderated Interactions between Glass and Cellulose Surfaces" @default.
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